Following are the ranks of electron-pair geometries by increasing steric number: linear, trigonal Planar, Trigonal Bipyramidal, Tetrahedral, and Octahedral.
These are discussed in detail below:
1. Linear (Steric Number 2)
2. Trigonal Planar (Steric Number 3)
3. Trigonal Bipyramidal (Steric Number 4)
4. Tetrahedral (Steric Number 4)
5. Octahedral (Steric Number 5)
The steric number of an electron-pair geometry indicates the number of bonds and lone pairs of electrons in the shape. The steric number of an electron-pair geometry increases as more bonds and lone pairs of electrons are added.
Linear electron-pair geometries, such as linear geometry, have the lowest steric number, while shapes with more electron pairs, such as octahedral and trigonal bipyramidal geometries, have higher steric numbers.
The linear geometry has two electron pairs, the trigonal planar geometry has three electron pairs, the trigonal bipyramidal geometry has five electron pairs, the octahedral geometry has six electron pairs, and the tetrahedral geometry has four electron pairs.
Thus, the rank of electron-pair geometries by increasing steric number is linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral.
To know more about steric numbers refer here:
https://brainly.com/question/29401030#
#SPJ11
Complete Question:
Rank the following electron-pair geometries by increasing steric number.
1. linear
2. trigonal planar
3. trigonal bipyramidal
4. octahedral
5. tetrahedral
suppose you heat a metal object with a mass of 72.0 g to 105.3 oc and transfer it to a calorimeter containing 100.0 g of water at 15.0 oc. the water and metal reach a final temperature of 25.7 oc. the specific heat of water is 4.18 j/g-oc. what is the specific heat of the metal in j/g-oc? select one: 0.550 j/g-oc 0.780 j/g-oc 0.418 j/g-oc 0.631 j/g-oc
In the given question, 0.550 J/g-°C is the specific heat of the metal. The correct answer is option a.
Specific heat is defined as the amount of heat energy needed to raise the temperature of one unit of mass of a substance by one degree Celsius (or one Kelvin).
To calculate the specific heat of the metal, we can use the equation:
q(metal) = -q(water)
where q(metal) is the heat absorbed by the metal, and q(water) is the heat released by the water. The negative sign indicates that the heat lost by the water is equal in magnitude to the heat gained by the metal.
c(metal) = [m(water) [tex]\times[/tex] c(water) [tex]\times[/tex] ΔT] / [m(metal) [tex]\times[/tex] ΔT]
where,
c(metal) is the specific heat of the metal,
m(water) is the mass of the water,
c(water) is the specific heat of water,
ΔT is the change in temperature and
m(metal) is the mass of the metal.
Substituting the given values, we get:
c(metal) = [100.0 g [tex]\times[/tex] 4.18 J/g-°C [tex]\times[/tex] (25.7°C - 15.0°C)] / [72.0 g [tex]\times[/tex] (105.3°C - 25.7°C)]
c(metal) = 0.550 J/g-°C
Therefore, the specific heat of the metal is option a. 0.550 J/g-°C.
Learn more about Specific heat here:
https://brainly.com/question/31608647
#SPJ12
The fabrication method that joins together materials, usually metal, is known as __________.a. castingc. cuttingb. millingd. welding
The fabrication method that joins together materials, usually metal, is known as welding.
There are several different types of welding, including:
Arc welding - This involves using an electric arc to create heat and melt the metal pieces to be joined. The most common types of arc welding include shielded metal arc welding (SMAW), gas metal arc welding (GMAW), and gas tungsten arc welding (GTAW).
Gas welding - This involves using a gas flame to heat the metal pieces to be joined. The most common types of gas welding include oxy-fuel welding and oxy-acetylene welding.
Resistance welding - This involves using an electric current to heat the metal pieces to be joined. The most common types of resistance welding include spot welding, seam welding, and projection welding.
Laser welding - This involves using a high-energy laser beam to heat and melt the metal pieces to be joined.
To know more about welding, visit: brainly.com/question/29654991
#SPJ4
A rock brought back from the moon contained 1/8 of a radioactive substance that was present when the rock was formed. If the half-life of this substance is 1.5 billion years, how old is the moon rock?
The age of the moon rock is roughly 11.8 billion years.
The age of the moon rock can be estimated using the half-life of the radioactive substance. The half-life of a radioactive substance is the amount of time it takes for half of the original amount of the substance to decay. In this case, the half-life is 1.5 billion years.
To determine the age of the moon rock, we can use the concept of exponential decay. Exponential decay is a mathematical term that describes the rate at which a substance decays over time. Since the rock contains 1/8 of the original amount of the radioactive substance, we can use this information to estimate the age of the rock.
Assuming that the original amount of the radioactive substance has decayed exponentially over time, we can determine the age of the rock using the following equation:
[tex]Age =\frac{ (Half-life *ln(\frac{1}{8})) }{ ln(2)}[/tex]
Plugging in the given information, we get:
[tex]Age = \frac{(1.5\ billion\ years\ * \ ln(\frac{1}{8})) }{ ln(2)}[/tex]
Solving for Age, we get:
Age = 11.8 billion years
Therefore, the moon rock is estimated to be 11.8 billion years old.
learn more about radioactive Refer:brainly.com/question/14986315
#SPJ1
what two factors determine how much gravitational potential energy an object has?
An object's gravitational potential energy depends on its mass and its height above a reference level. The higher the object and the greater its mass, the more gravitational potential energy it has.
The amount of gravitational potential energy that an object has depends on two factors: its mass and its height above a reference level, such as the ground. The gravitational potential energy of an object increases with its mass, as well as its height above the reference level. The higher the object is from the reference level, the more potential energy it has due to the gravitational force between it and the Earth. This is expressed mathematically as:
Gravitational potential energy = mass x gravity x height
where "mass" is the mass of the object, "gravity" is the acceleration due to gravity, and "height" is the distance of the object from the reference level.
Learn more about gravitational potential energy here: brainly.com/question/19768887
#SPJ4
an atom of a mystery element contains 7 protons, 7 neutrons, and 7 electrons. what is the mass number?
an atom of a mystery element contains 7 protons, 7 neutrons, and 7 electrons the mass number of the mystery element is 14.
calculation: by adding the number of protons and neutrons together (7 + 7 = 14). The number of protons and neutrons in an atom determines its mass number, while the number of electrons determines its charge.
Atoms are composed of three main subatomic particles: protons, neutrons, and electrons. Protons have a positive charge and are located in the nucleus of an atom, while neutrons are neutral particles also found in the nucleus. Electrons are negatively charged and are located in the electron cloud.
The mass number of an atom is the sum of the protons and neutrons in its nucleus. Therefore, the mass number of an atom with 7 protons, 7 neutrons, and 7 electrons is 14. When talking about atoms, scientists often refer to the atomic number, which is the number of protons in the nucleus. In this case, the atomic number of the mystery element is 7, since it has 7 protons. The atomic number of an atom is important for identifying it, as each element has a different atomic number.
In summary, an atom of a mystery element that has 7 protons, 7 neutrons, and 7 electrons has a mass number of 14. The atomic number of this element is also 7, as it has 7 protons.
Know more about atomic number here:
https://brainly.com/question/28992636
#SPJ11
The Jones oxidation is a test for primary and secondary alcohols. Indicate whether the following compounds would give a positive in a Jones oxidation? (Y or N)
cyclohexanol
2, 3-dimethyl-2-hexanol
1-butanol
Morphine
Tert-butanol
The compounds that give positive results in the Jones oxidation test are primary and secondary alcohols. The compounds that give negative results in the Jones oxidation test are tertiary alcohols and unsaturated alcohols.
As per the Jones oxidation test, it is considered that primary and secondary alcohols give positive results while tertiary alcohols and unsaturated alcohols give negative results. Jones oxidation test is a method to oxidize primary and secondary alcohols to their corresponding aldehydes and ketones. The reagents required for the Jones oxidation test are chromic acid, sulfuric acid, and acetone.
The Jones oxidation test is a method for oxidizing primary and secondary alcohols to their corresponding aldehydes and ketones. The test reagents are chromic acid, sulfuric acid, and acetone. This test was first introduced by Sir Edward Frankland Jones in the year 1887. This test is used to differentiate between primary, secondary, and tertiary alcohols.
Here are the given compounds and their answer for the Jones oxidation test: cyclohexanol - Yes, cyclohexanol will give a positive result in the Jones oxidation test.2, 3-dimethyl-2-hexanol - No, 2,3-dimethyl-2-hexanol will not give a positive result in the Jones oxidation test. 1-butanol - Yes, 1-butanol will give a positive result in the Jones oxidation test.
Morphine - No, morphine will not give a positive result in the Jones oxidation test.Tert-butanol - No, tert-butanol will not give a positive result in the Jones oxidation test.
You can learn more about oxidation at: brainly.com/question/16976470
#SPJ11
What is an acid salt
Answer:
The salts which are obtained by the partial replacement of ionizable hydrogen atoms of a polybasic acid by a metal or an ammonium ion are called acidic salts.
H2SO4 + NaOH → NaHSO4 +H2O
Answer:
Acid salts are a class of salts that produce an acidic solution after being dissolved in a solvent.
Explanation:
Any compound that increases the number of hydronium ions when dissolved in water is called?
A compound that increases the number of hydronium ions when dissolved in water is known as an acid.
Acids are compounds that donate protons (H+) to water molecules, resulting in the formation of hydronium ions ([tex]H_3O^+[/tex]). Acids have a sour taste, react with metals to produce hydrogen gas, turn blue litmus paper red, and have a pH lower than 7.The aqueous cation [tex]H_3O^+[/tex], an oxonium ion type created by protonating water, is known as hydronium in common usage. As an Arrhenius acid dissolves in water, the surrounding water molecules receive a proton from the Arrhenius acid molecules, which is known as a positive hydrogen ion (H+). This is why it is frequently referred to as the positive ion present ([tex]H_2O[/tex]).
learn more about Acids Refer:brainly.com/question/29796621
#SPJ1
write a balanced chemical equation, including physical state symbols, for the combustion of gaseous butane into gaseous carbon dioxide and gaseous water.
The balanced chemical equation, including physical state symbols, for the combustion of gaseous butane into gaseous carbon dioxide and gaseous water is:C4H10(g) + 13/2 O2(g) → 4CO2(g) + 5H2O(g)
Firstly, write the unbalanced chemical equation and then balance it using the given steps:
Step 1: Write the unbalanced equation for the given chemical reaction.C4H10 + O2 → CO2 + H2O
Step 2: Count the number of atoms of each element in the reactants and the products. C4H10 + O2 → CO2 + H2O
Reactants: Carbon = 4Hydrogen = 10Oxygen = 2 + (1/2) × 13 = 8.5
Products: Carbon = 1 × 4 = 4Hydrogen = 2 × 5 = 10Oxygen = 2 + (1/2) × 10 = 7
Step 3: Balance the equation by putting coefficients in front of the compounds.C4H10 + O2 → 4CO2 + 5H2O
Reactants: Carbon = 4Hydrogen = 10Oxygen = 2 + (1/2) × 13 = 8.5
Products: Carbon = 1 × 4 = 4Hydrogen = 2 × 5 = 10Oxygen = 2 + (1/2) × 10 = 7
By multiplying 4 to CO2, the Carbon will get balanced. By multiplying 5 to H2O, the Hydrogen will get balanced. By multiplying 13/2 to O2, Oxygen will get balanced.
The balanced chemical equation for the combustion of gaseous butane into gaseous carbon dioxide and gaseous water is C4H10(g) + 13/2 O2(g) → 4CO2(g) + 5H2O(g).
To know more about butane, refer here:
https://brainly.com/question/30325983#
#SPJ11
Which element would most likely have an oxidation number of +1?
OA. boron
OB. carbon
OC. lithium
OD. nitrogen
a sample of water, h2o, has a mass of 24.50 g. calculate the number of water molecules in the sample.
Therefore, the number of water molecules in the given sample is approximately [tex]8.18 * 10^2^3[/tex] molecules.
What is Avogadro's number?To calculate the number of water molecules in the given sample, we need to use the concept of Avogadro's number and the molecular weight of water.
The molecular weight of water (H2O) is:
H = 1.008 u (atomic mass units)
O = 15.999 u (atomic mass units)
Molecular weight of H2O = (2 x 1.008 u) + 15.999 u = 18.015 u
Using the molecular weight of water, we can calculate the number of moles of water in the sample:
Number of moles = mass / molecular weight
Number of moles = 24.50 g / 18.015 g/mol
Number of moles = 1.359 mol
Now, using Avogadro's number ([tex]6.022 *10^2^3[/tex] molecules/mol), we can calculate the number of water molecules in the sample:
Number of water molecules = Number of moles x Avogadro's number
Number of water molecules = [tex]1.359 mol * 6.022 *10^2^3[/tex] molecules/mol
Number of water molecules =[tex]8.18 * 10^2^3[/tex]molecules
To know more about molecules visit:-
brainly.com/question/21263612
#SPJ1
A welder's acetylene tank has a volume of 75.0L. It is stored at a temperature of 23.24 degrees C and has a pressure of 7667kPa. How many moles of acetylene are in the tank?
A welder's acetylene tank has volume of 75.0L There are approximately 196.7 moles of acetylene in the tank.
What is acetylene?Acetylene is a chemical compound with the formula as C₂H₂ and structure H−C≡C−H.
PV = nRT
P is pressure, V is volume, n is number of moles, R is gas constant, and T is temperature in kelvins.
Now convert the temperature from degrees Celsius to kelvins:
T = 23.24°C + 273.15 = 296.39 K
n = PV / RT
=(7667 kPa)(75.0 L) / [(8.314 J/mol K)(296.39 K)]
So, n = 196.7 mol
Therefore, there are approximately 196.7 moles of acetylene in the tank.
To know more about acetylene, refer
https://brainly.com/question/15346128
#SPJ1
Which of the following compounds will have the strongest dipole-dipole interactions between its molecules? a. CF4 b. CH4 c. CH3F.
d. CH2F2 e. CH3Cl
The compound that will have the strongest dipole-dipole interactions between its molecules is [tex]CH_{2}F_{2}[/tex] (option D).
What are dipole-dipole interactions?Dipole-dipole interаctions occur when two polаr molecules come into contаct with one аnother. The positive end of one molecule is аttrаcted to the negаtive end of the other, resulting in the formаtion of а dipole-dipole interаction. The strength of dipole-dipole interаctions is influenced by fаctors such аs moleculаr shаpe аnd size, аs well аs the polаrity of the molecule.
In this question, [tex]CH_{2}F_{2}[/tex] will hаve the strongest dipole-dipole interаctions between its molecules becаuse it is а polаr molecule with а [tex]CH_{2}F_{2}[/tex] shаpe. [tex]CF_{4}[/tex] is non-polаr, so it will not experience dipole-dipole interаctions. [tex]CH_{4}[/tex] is аlso non-polаr, so it will not experience dipole-dipole interаctions. [tex]CH_{3}F[/tex] is polаr, but it is less polаr thаn [tex]CH_{2}F_{2}[/tex]. [tex]CH_{3}Cl[/tex]CH3Cl is аlso polаr, but it is less polаr thаn [tex]CH_{2}F_{2}[/tex].
To learn more about dipole-dipole interаctions, click here: https://brainly.com/question/31041467
#SPJ11
Which one of the following molecules and ions will have a planar geometry?
Group of answer choices
BrF3
PF6-
SO42-
SF4
NH3
The molecule/ion with a planar geometry among the given choices is SO42-.
Step-by-step explanation:
1. Determine the central atom: Sulfur (S) is the central atom in SO42-.
2. Calculate the number of electron pairs around the central atom: Sulfur has 6 valence electrons, and there are 4 oxygen atoms (each contributing 1 electron), plus 2 extra electrons from the 2- charge. So, there are (6+4+2)/2 = 6 electron pairs.
3. Identify the electron pair geometry: With 6 electron pairs, the electron pair geometry is octahedral.
4. Determine the molecular geometry: In SO42-, there are 4 bonding pairs (with O atoms) and 2 non-bonding pairs. In an octahedral arrangement with 2 non-bonding pairs, the molecular geometry is square planar, which is a planar geometry.
Know more about planar geometry
https://brainly.com/question/29589466
#SPJ11
The tank has a pressure maximum of 25 atm (beyond this it will explode). What temp would the original amount of gas need to be heated I order to make the tank explode ( in Celsius)
Initially 2.04 moles of Argon gas war present in the tank, then 0.74 moles escaped the pressure of remaining moles is 3.6atm and the maximum temperature is 747K.
Given that Argon gas behaves as an ideal gas.
The volume of tank filled with argon = 5L
Initial temperature of argon gas = 25.0 °C = 25 + 273 = 298K
Initial pressure of gas = 10 atm
Let the number of moles of argon in tank initially = n
We know that from ideal gas equation that: PV = nRT where R = 0.08206 L·atm/mol·K which is a gas constant such that:
n = PV/RT = [tex]10 * 5/0.08206 * 298 = 2.04[/tex] moles of argon
Moles of gas escaped = 1.3
Remaining moles of gas in tank (n2) = 2.04 - 1.3 = 0.74moles
The new pressure of this gas = P
P = n2 * R *T/V = [tex]0.74 * 0.082 * 298/5 = 3.6atm[/tex]
The maximum pressure of tank = 25atm
The temperature to which the tank be heated = T
25 * 5 = 2.04 * 0.082 * T
T = 747K
To learn more about moles click here https://brainly.com/question/26416088
#SPJ1
complete question: Argon gas behaves as an ideal gas at normal temperatures. Consider a 5.00 L tank filled with Argon at room temperature (25.0 °C) and 10 atmospheres. (R = 0.08206 L·atm/mol·K) How many moles of Argon are in the tank? The tank is left slightly open and 1.30 moles of the gas escapes (from the number of moles calculated in the first part). What is the new pressure inside of the tank? (Hint: how much gas is left in the tank?) The tank has a pressure maximum of 25 atm (beyond this it will explode). What temp would the original amount of gas need to be heated I order to make the tank explode ( in Celsius)
How many grams of CaCl2 should be dissolved in 500 mL of water to make a 0.20 M solution of CaCl2?
Taking into account the definition of molarity and molar mass, 11.09 grams of CaCl₂ should be dissolved in 500 mL of water to make a 0.20 M solution of CaCl₂.
Definition of molarityMolarity is a measure of the concentration. This indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by:
molarity= number of moles of solute÷ volume
Molarity is expressed in units moles/L.
Definition of molar massThe molar mass of substance is defined as the amount of mass that a substance contains in one mole.
Mass of CaCl₂In this case, you must dissolve CaCl₂ in 500 mL (or 0.500 L) of water to make a a 0.20 M solution of CaCl₂.
Replacing in the definition of molarity:
0.20 M= number of moles of solute÷ 0.500 L
Solving:
0.20 M × 0.500 L= number of moles of solute
0.1 moles= number of moles of solute
The molar mass of CaCl₂ is 110.9 g/mole. So, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 110.9 grams, 0.1 moles of the compound contains how much mass?
mass= (0.1 moles× 110.9 grams)÷ 1 mole
mass= 11.09 grams
Finally, 11.09 grams of CaCl₂ should be dissolved.
Learn more about molar mass:
brainly.com/question/5216907
#SPJ1
which of the following compounds would form only london dispersion forces with an identical compound? question 2 options: co2 cacl2 ch3och3 hcn c3h7oh
Co2 is the compound that, when combined with an identical compound, would only produce London dispersion forces.
What are some examples of London dispersion?When the electrons in two nearby atoms occupy positions that cause the atoms to temporarily form dipoles, the consequence is the London dispersion force, a transient attractive force.
Which of the following chemicals would only interact with an identical compound to create London dispersion forces?phosphorous pentachloride and silicon tetrafluoride. Nonpolar substances silicon tetrafluoride and phosphorous pentachloride will only display the London Forces of attraction.
To know more about compound visit:-
https://brainly.com/question/13516179
#SPJ1
Select the gene regulatory mechanisms that are different between prokaryotes and eukaryotes I. Chromatin packaging occurs in eukaryotes. II. Eukaryotic DNA contains enhancers. III. Multiple basal transcription factors are found in eukaryotes. IV. The structure of adenine is different in eukaryotic DNA. V. Nuclear export of RNA occurs in prokaryotes. A. I and II are correct B. I, II and III are correct C. I, II, III and IV are correct D. All are correct E. All are incorrect
The correct option is B. I, II and III are correct. Gene regulatory mechanisms in eukaryotes and prokaryotes are different.
The differences are Chromatin packing: Eukaryotes perform chromatin packing. The DNA in eukaryotes is wrapped around histones, which results in compacting the DNA. Chromatin packing is not performed by prokaryotes. Enhancers: Enhancers are regulatory sequences present in the DNA of eukaryotes. They are not present in prokaryotes. The enhancer influences the transcription of the genes in eukaryotes. Multiple basal transcription factors: Eukaryotes possess multiple basal transcription factors, which are not present in prokaryotes. The transcription process is different in both eukaryotes and prokaryotes. Prokaryotes do not require basal transcription factors. The structure of adenine is different in eukaryotes: This statement is incorrect. Adenine has the same structure in both eukaryotes and prokaryotes. Nuclear export of RNA: Prokaryotes do not have nuclei. This statement is not true for prokaryotes. They do not have a nucleus for the nuclear export of RNA.
To learn more about Eukaryotes :
https://brainly.com/question/30705183
#SPJ11
At 250 °C a gas has a volume of 425 mL. What is the volume of this gas at 125°C?
Charles's Law-
[tex]\:\:\:\:\:\: \:\:\:\:\:\:\star\longrightarrow\sf \underline{\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}}\\[/tex]
Where:-
V₁ = Initial volumeT₁ = Initial temperatureV₂ = Final volumeT₂ = Final temperatureAs per question, we are given that -
V₁=425 mLT₁ = 250°CT₂ =125°CWe are given the initial temperature and the final temperature in °C.So, we first have to convert those temperatures in Celsius to kelvin by adding 273-
[tex]\:\:\:\:\:\:\star\sf T_1[/tex] = 250+ 273 = 523 K
[tex]\:\:\:\:\:\:\star\sf T_2[/tex] =125+273 = 398K
Now that we have obtained all the required values, so we can put them into the formula and solve for V₂ :-
[tex]\:\:\:\:\:\: \:\:\:\:\:\:\star\longrightarrow\sf \underline{\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}}\\[/tex]
[tex] \:\:\:\:\:\:\:\:\:\:\:\:\longrightarrow \sf V_2= \dfrac{V_1}{T_1}\times T_2\\[/tex]
[tex] \:\:\:\:\:\:\:\:\:\:\:\:\longrightarrow \sf V_2= \dfrac{425}{523}\times 398\\[/tex]
[tex] \:\:\:\:\:\:\:\:\:\:\:\:\longrightarrow \sf V_2= 0.8126195..........\times 398\\[/tex]
[tex]\:\:\:\:\:\: \:\:\:\:\:\:\longrightarrow \sf V_2 =323.4225.............\\[/tex]
[tex] \:\:\:\:\:\:\:\:\:\:\:\:\longrightarrow \sf\underline{ V_2= 323.42\:mL}\\[/tex]
Therefore, the volume of this gas at 125°C will become 323.42 mL.
the halo effect occurs because it is impossible for us to assimilate everything we see. group of answer choices true false
The halo effect occurs because it is impossible for us to assimilate everything we see, the given statement is true.
The halo effect occurs because it is impossible for us to assimilate everything we see. The statement is true. The halo effect is a cognitive bias in which an individual's perception of someone or something is influenced by their overall impression of them.
This can result in an individual overlooking or ignoring certain negative characteristics of the person or thing.
The halo effect is a cognitive bias in which an individual's perception of someone or something is influenced by their overall impression of them. This can result in an individual overlooking or ignoring certain negative characteristics of the person or thing.
Furthermore, the halo effect occurs as a result of our inability to assimilate everything we see, which results in our brains taking shortcuts when it comes to processing information.
The assimilation process involves using past experiences to interpret new information. When our brains are overloaded with information, the assimilation process can be disrupted, resulting in our brains taking shortcuts to make sense of the information presented to us.
This, in turn, can result in the halo effect, as our brains attempt to create a general impression of the individual or thing rather than processing all of the available information.
Learn more about halo effect on:
https://brainly.com/question/15020057
#SPJ11
How many grams of mgo are produced during an enthalpy change of -231 kj ?
An enthalpy shift of -231 kJ results in the production of 7.44 g of MgO.
To determine the amount of MgO produced during an enthalpy change of -231 kJ, we need to use stoichiometry and the enthalpy change per mole of MgO produced.
The balanced chemical equation for the formation of MgO from Mg and O2 is:
2Mg(s) + O₂(g) → 2MgO(s)
The enthalpy change for this reaction is -1204 kJ/mol of MgO produced.
To find the amount of MgO produced during an enthalpy change of -231 kJ, we can use the following equation:
(-231 kJ) x (1 mol MgO/ -1204 kJ) x (40.3 g MgO/1 mol MgO) = 7.44 g MgO
Therefore, 7.44 g of MgO are produced during an enthalpy change of -231 kJ.
To learn more about enthalpy refer to:
brainly.com/question/13996238
#SPJ4
what color does litmus paper appear in a basic solution?
When litmus paper is dipped into an acidic solution, it turns red, and In basic solutions the litmus paper changes color from its original red to blue or purple.
When litmus paper is dipped into an acidic solution, it turns red, indicating the presence of an acid. Conversely, when litmus paper is dipped into a basic solution, it turns blue or purple, indicating the presence of a base. This color change occurs because the litmus dye in the paper is a weak acid that undergoes a chemical reaction when it comes into contact with a basic solution.
In basic solutions, the pH is higher than 7, which means that there are more hydroxide ions (OH-) present than hydrogen ions (H+). The litmus dye in the paper reacts with these hydroxide ions to form a different colored ion. This ion has a blue or purple color, which causes the litmus paper to change color from its original red to blue or purple in basic solutions.
It is important to note that the color change of litmus paper in a basic solution is not an exact measure of the pH of the solution. Litmus paper is a qualitative indicator, which means it only gives a rough estimate of the pH of a solution based on the observed color change. To obtain a more precise measurement of the pH, a pH meter or other quantitative indicator should be used.
Learn more about litmus paper here brainly.com/question/1470773
#SPJ4
the rate of decomposition of radioactive radium is proportional to the amount present at any time. the half-life of radioactive radium is 1599 years. what percent of a present amount will remain after 515 years? (round your answer to two decimal places.)
Approximately 73.27% of the present amount of radioactive radium will remain after 515 years (rounded to two decimal places).
To find the percent of the present amount of radioactive radium that will remain after 515 years, you can follow these steps:
1. Use the half-life formula for radioactive decay: A(t) = A0 * (1/2)^(t/T), where A(t) is the amount remaining after time t, A0 is the initial amount, t is the elapsed time, and T is the half-life.
2. In this case, T = 1599 years (half-life of radioactive radium) and t = 515 years. The question asks for the percentage remaining, so you don't need to know the initial amount, A0.
3. Plug in the given values: A(515) = A0 * (1/2)^(515/1599).
4. Calculate the fraction: (1/2)^(515/1599) ≈ 0.7327.
5. Convert the fraction to a percentage: 0.7327 * 100 = 73.27%.
For more details about radioactive click here:
https://brainly.com/question/1770619#
#SPJ11
3. Given the equation of reaction below 5Br+ BrO3 + 6H → 3Br2 + 3H₂O What is the molecularity of the reaction? (A) 3 (B) 5 (C) 6 (D) 12
Answer:
3 is the molecularity of the reaction
How do temperature, concentration, and particle size of the reactants in a chemical reaction relate to the collision theory of chemical reactions?
Answer:
Temperature, concentration, and particle size of the reactants affect the collision frequency and energy of collisions in a chemical reaction, as predicted by the collision theory.
Explanation:
According to the collision theory of chemical reactions, for a reaction to occur, reactant particles must collide with sufficient energy and proper orientation. The temperature, concentration, and particle size of the reactants can affect the likelihood and frequency of these collisions and therefore impact the reaction rate.
Temperature: Increasing the temperature of the reactants generally increases the reaction rate because it increases the kinetic energy of the reactant particles. This means that the particles move faster, collide more frequently, and with more energy, making it more likely for successful collisions to occur. Additionally, increasing the temperature can cause more reactant molecules to possess the minimum energy required for a successful collision to occur.Concentration: Increasing the concentration of reactant particles also increases the frequency of collisions, which can increase the reaction rate. This is because the higher the concentration of reactant particles, the more frequently they collide with one another. This results in a greater number of successful collisions, which leads to a faster rate of reaction.Particle size: The particle size of the reactants can also affect the collision rate and therefore the reaction rate. When the reactant particles are smaller, they have a larger surface area, which increases the frequency of collisions between the reactant particles. This results in a higher reaction rate. Conversely, larger reactant particles have a smaller surface area, which decreases the frequency of collisions and can result in a slower reaction rate.Overall, the collision theory of chemical reactions suggests that temperature, concentration, and particle size all play important roles in determining the rate of a chemical reaction. By controlling these factors, it is possible to manipulate the rate of a reaction to achieve desired results.
when solutions of colorless lead nitrate and colorless magnesium iodide are mixed, an insoluble precipitate [ select ] form. the color of the solution will be [ select ] ; that of the solid will be
When solutions of colorless lead nitrate and colorless magnesium iodide are mixed, an insoluble precipitate will form. The color of the solution will be colorless; that of the solid will be yellow.
When solutions of colorless lead nitrate and colorless magnesium iodide are mixed, an insoluble precipitate will form. . Precipitation is the process by which this happens. The precipitation reaction is described as a double-replacement reaction. During this type of reaction, two aqueous solutions react to produce an insoluble solid. That insoluble solid is referred to as a precipitate. Magnesium iodide and lead nitrate are soluble in water. When these two solutions are mixed, the cations (positive ions) and the anions (negative ions) switch partners, forming new insoluble substances such as magnesium nitrate and lead iodide. The formula for lead iodide is PbI2. Magnesium nitrate, Mg(NO3)2, and lead nitrate, Pb(NO3)2, are the other reactants that produce the insoluble solid PbI2 as a result of the reaction. When solutions of colorless lead nitrate and colorless magnesium iodide are mixed, an insoluble precipitate will form. The color of the solution will be clear or transparent; that of the solid will be yellow.
Learn more about precipitation - brainly.com/question/30441217
#SPJ11
SEP Plan Your Investigation Ice axes and carabiners are important tools
used by mountaineers summiting snowy peaks. These objects need to
be strong and reliable in cold temperatures. Engineers have choices of
materials to use in making these tools. Plan an investigation that could
provide the evidence needed to decide which material is best to use.
Objective: Determine which material is the strongest and most reliable in cold temperatures for making ice axes and carabiners used by mountaineers summiting snowy peaks.
Plan:
Select the materials to be tested: Possible options could include aluminum, steel, titanium, and carbon fiber.
Create a testing apparatus: The testing apparatus should simulate the conditions in which ice axes and carabiners are used, such as a cold room or freezer. The apparatus should also be able to measure the strength of the materials being tested.
Test the materials: Each material should be tested multiple times to ensure consistency of results. The tests should include measuring the strength of the material in a cold environment and under stress.
Analyze the results: Compare the strength and reliability of each material based on the test results. Consider factors such as the weight of the material and the cost of production.
Draw conclusions: Based on the analysis of the results, determine which material is the best option for making ice axes and carabiners to be used by mountaineers summiting snowy peaks.
Note: It is important to conduct this investigation in a controlled and safe environment, using appropriate safety equipment and procedures.
tendency of electrons to enter orbitals of lowest energy first is called?
The tendency of electrons to enter orbitals of lowest energy first is called the Aufbau principle.
This principle states that electrons fill atomic orbitals in order of increasing energy level, starting with the lowest energy level and proceeding to higher energy levels until all the electrons of the atom have been accounted for. This principle helps to explain the electron configuration of atoms and the periodic trends observed in the properties of elements in the periodic table.
The Aufbau principle is a fundamental concept in chemistry that helps to explain how electrons are arranged within an atom. Atoms are composed of subatomic particles, including protons, neutrons, and electrons. Protons and neutrons are located in the nucleus of an atom, while electrons orbit around the nucleus in shells or energy levels.
To know more about Aufbau principle, visit: brainly.com/question/13393709
#SPJ4
a substance that donates one proton when dissolved in water____analytediprotic acidsalttripotic acidmonoprotoc acidtitrant
A substance that donates one proton when dissolved in water is called a acid monoprotic . Monoprotic acids are a type of acid that can donate one proton (H+) per molecule when dissolved in water. Option: 3 is correct.
Examples of monoprotic acids include hydrochloric acid (HCl) and acetic acid (CH3COOH). When a monoprotic acid is dissolved in water, it ionizes to form H+ ions and corresponding conjugate base. The strength of a monoprotic acid is determined by its ability to donate a proton, which is measured by its dissociation constant (Ka). Monoprotic acids are important in many chemical reactions and are widely used in industries such as food, pharmaceuticals, agriculture. Option: 3 is correct.
To know more about Monoprotic acids, here
brainly.com/question/22497931
#SPJ4
--The complete question, a substance that donates one proton when dissolved in water____.
analytediprotic acid salttripotic acid monoprotic acid titrant ---select the single best answer. for a given reaction at a given temperature, the value of k is constant. is the value of q also constant?
If for a given reaction at a given temperature, the value of k is constant, the value of q is not constant.
The given statement is related to equilibrium constant (k) and reaction quotient (q). For a given reaction at a given temperature, the value of k is constant. This statement implies that if we change the concentration of reactants or products, the system will adjust to establish a new equilibrium with the same equilibrium constant. This is because k depends only on the temperature, and not on the concentration of reactants or products.
However, this is not true for the reaction quotient (q). The value of q can change if we change the concentration of reactants or products. When the reaction quotient is equal to the equilibrium constant (q=k), the system is at equilibrium. But if q is not equal to k (q > k or q < k), then the system is not at equilibrium and the reaction will proceed in the direction that reduces the value of q towards k.
Hence, the value of q is not constant for a given reaction at a given temperature, while the value of k is constant.
Note: The question is incomplete. The complete question probably is: For a given reaction at a given temperature, the value of K is constant. Is the value of Q also constant?
Learn more about Equilibrium constant:
https://brainly.com/question/3159758
#SPJ11