Answer:
Mg + 2HCl=== Mg(Cl)2 + H2
The Reaction is a single displacement reaction.
Yes!
This reaction obeys the law of conservation which states that for a closed system... Matter and energy transfer is constant.
Meaning that the Mass of products must equal mass of Reactants
To prove this
lets Calculate the Mass of reactants
24g + 73g=97g.
Mass of Products...
95g + x.
let's calculate the mass of Hydrogen produced.
Note: You can get it using any of the reactants... I'll use Magnesium
Now from the balanced reaction.... 1mole of Mg reacts to produce 1mole of Hydrogen
Moles of Mg=Mass/Molar Mass
Given Mass=24g
Molar mass of Mg=24
Mole of Mg =24/24
=1mole
Since Mole ratio of Mg and H2 is 1:1.... Therefore 1Mole of Hydrogen is produced too.
To get Mass of H2
Again
Mole=Mass/Mm
Known= 1mole of H2 isproduced
Mass of H2 =2g
Mole=Mass/Mm
Mass =Mole x Mm
= 1 x 2
=2g
Now
Total Mass of products is
95 +2 = 97g.
This is the same with the Mass of Reactants
So The Law of Conservation of Mass Holds.
A sample of a substance was heated strongly in a crucible, and the sample increased in mass.
This is evidence that
A. A gas had been evolved.
B. The substance had melted.
C. The substance had sublimed.
D. A chemical change had taken place.
O E. A change of state had occurred.
When a sample of a substance was heated strongly in a crucible, the sample increased in mass. This is evidence that a chemical change has taken place.
In a closed system, when no heat or energy is applied, the mass of a substance will remain the same. But, when heated at high temperatures, the average kinetic energy of the particles of a substance increase due to which the particles will move faster, and collide with each other and take up more space. There will be transfer of energy due to application of heat. As a result of this the mass of the sample also increases.
Hence, option D is correct
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which element is extracted from bauxide ore
Which has the larger ionic size Li+ or K?
Answer: K
Explanation: as we move down the group new shells are added and this increases the distance between the outermost electron and the nucleus.
Balance the following equations
a.H2+O2 -> H2O
b.ZnS + O2 -> ZnO + SO2
Answer:
a. 2H2 + O2--> 2H2O
b. 2ZnS +3O2-->2ZnO +2SO2
Explanation:
a.
note:
(when you put coefficients before the elements or the compounds you should multiply it by each element and the number that's on its right...
so if it's 2H2O
that is 2xH2 which is 4 hydrogen atoms
and 2 x O which is 2 oxygen atoms )
......
on the left side of the equation
there are two atoms of oxygen
but on the right side there's only one atom
so in order to balance them you have to put 2 as a coefficient for H2O
H2+O2 ->2H2O
so now you have 2 hydrogen atoms on the left side and 4 on the right side
you put 2 as a coefficient for H2
and now
there's 4 hydrogen atoms on both sides
and 2 oxygen atoms on both sides
b.
you do the same here
ZnS + O2 -> ZnO + SO2
2 oxygen atoms ---> 3 oxygen atoms
ZnS + 2O2 -> ZnO + SO2
4 oxygen atoms ---> 3 oxygen atoms
ZnS + 2O2 -> 2ZnO + SO2
4 oxygen atoms ---> 4 oxygen atoms
but
1 Zn ---> 2Zn
2ZnS + 2O2 -> 2ZnO + SO2
2S --> 1S
2ZnS + 2O2 -> 2ZnO + 2SO2
2S--> 2S
but
4O---> 6O
2ZnS + 3O2 -> 2ZnO + 2SO2
How many liters of 30% acid must be added to 2 liters of 15% acid to result in a mixture that is 25% acid.
4 liters of 30% acid must be added to 2 liters of 15% acid to result in a mixture that is 25% acid.
To find the amount of 30% acid that must be added to 2 liters of 15% acid to result in a mixture that is 25% acid, we can use the concept of percentage concentration. The percentage concentration is defined as the ratio of the number of moles of solute (in this case acid) to the total number of moles of the solution.
Let's call x the number of liters of 30% acid to be added. Then the final volume of the solution is (2+x) liters.We know that the final concentration of the solution is 25%, so we can write the following equation:
(moles of acid in 2 liters of 15%) + (moles of acid in x liters of 30%) / (2+x) = 0.25
We can now use the percentage concentration to find the number of moles of acid in each volume of acid:
moles of acid in 2 liters of 15% = (2L * 0.15) = 0.3 moles
moles of acid in x liters of 30% = (xL * 0.30) = 0.30x molesWe can now substitute these values in the equation above:
(0.3) + (0.30x) / (2+x) = 0.25
Solving for x we can find the volume of 30% acid that needs to be added to the 2 liters of 15% acid:
0.3 + 0.30x = 0.25(2+x)
0.3 + 0.30x = 0.5 + 0.25x
0.05x = 0.2
x = 4 L. Therefore, 4 liters of 30% acid must be added to 2 liters of 15% acid to result in a mixture that is 25% acid.
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an empty bottle has a volume of 2.0 L at room temperature 25 C. What will the new volume be if you put it in the freezer (-4C)
An empty bottle has volume of 2 L at room temperature 25°C . If we put it in the freezer (-4°C), the new volume will be 1.8L.
According to Charles' law, " the volume of a given amount of gas held at constant pressure is directly proportional to the kelvin temperature". The equation is represented as:
V₁/T₁ = V₂/T₂
This means, with increase in temperature, volume will also increase and vice versa.
According to question,
V₁ = 2.0 L
T₁ = 25°C = (25+273)K = 298 K
T₂ = -4°C = (-4 + 273)K = 269 K
Using Charles' law equation,
V₁/T₁ = V₂/T₂
⇒V₂ = V₁×T₂ / T₁
⇒V₂ = 2L × 269 K/298K
⇒V₂ = 1.8 L
Thus, the new volume when the bottle is put in a freezer (-4°C ) is 1.8 L
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The electron-domain geometry of the AsF6- ion is octahedral. The hybrid orbitals used by the As atom for bonding are ________ orbitals.
The AsF6- ion has an octahedral electron-domain shape. Sp3d2 orbitals are the hybrid orbitals that the As atom utilizes for bonding.
The octahedral geometry of AsF6-. All six fluorine atoms are sp3d2 hybrid orbitals with the central arsenic atom, and they all form 90° and 180° bond angles in an octahedral geometry. Arsenic(As), with atomic number 33, is the main atom in the AsF6-. Configuration of the formula As(33)=[Ar]3d104s24p3. As a result, As' valence shell contains five electrons. It can therefore create five single bonds with a fluorine atom and one more single bond with a fluorine atom as a result of one negative charge. Consequently, there are six bond pairings in total.
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Consider a fusion reaction in which a proton fuses with a neutron to form a deuterium nucleus. How much energy is released in this reaction?(The mass of the deuterium nucleus is 2.01355u).
Energy released in the reaction in which a proton fuses with a neutron to form a deuterium nucleus is calculated as 2.234 MeV.
What do you understand by a fusion reaction?In fusion reaction, two light nuclei merge to form single heavier nucleus. The process releases energy because total mass of the resulting single nucleus is less than the mass of two original nuclei. And the leftover mass becomes energy.
form a deuterium nucleus: 1^1H+0^1n⟶1^2H+γ The masses are 1^1H(1.0078u) 0^1n(1.0087u) and 1^2H(2.0141u) the γ -ray photon is massless.
Δm= 1.0078 +1.0087- 2.0141
Energy released = 2.4*10^-3 * 931 MeV
= 2.234 MeV
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Explain the relationship between an element's row number in the periodic table and the highest principal quantum number in the element's electron configuration. How does this relationship differ for main-group elements, transition elements, and inner transition elements
The row number in the periodic table corresponds to the highest principal quantum number (n) in the element's electron configuration, also known as the element's valence shell.
Difference between relationship of main-group elements, transition elements, and inner transition elements.For main-group elements, the highest principal quantum number increases from n = 2 in the first row to n = 3 in the second row and n = 4 in the third row. This means that main-group elements in the first row have their valence electrons in the 2nd energy level (n=2), elements in the second row have their valence electrons in the 3rd energy level (n=3) and elements in the third row have their valence electrons in the 4th energy level (n=4).
Transition elements have electron configurations that deviate from this pattern, they have electrons in higher energy level (n>3) but these electrons are not in the valence shell. They have a different valence electron configuration which allows them to exhibit multiple oxidation states, and also they have a d-block in their electron configuration
Inner transition elements also deviate from this pattern, they also have electrons in higher energy level (n>3) but these electrons are not in the valence shell. They have a different valence electron configuration which allows them to exhibit multiple oxidation states, and also they have a f-block in their electron configuration.
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Which of the following is consistent with an exothermic reaction that is nonspontaneous at high temperatures?
A.
?H > 0, ?S > 0, ?G < 0
B.
?H < 0, ?S < 0, ?G > 0
C.
?H < 0, ?S > 0, ?G > 0
D.
?H > 0, ?S < 0, ?G < 0
E.
?H < 0, ?S > 0, ?G < 0
As a result, option c is correct: H must be negative and S must be positive.
What is exothermic reaction?Energy is transmitted to or from the surroundings when a chemical reaction occurs. An exothermic reaction occurs when energy is transmitted to the surroundings, and the temperature of the surroundings rises. The term exothermic implies "heating up." As an exothermic process progresses, energy, frequently in the form of heat, is released. An exothermic reaction is one that is chemical in nature and is characterized by the release of energy in the form of heat or light. Matching a light with a matchstick is an example of this sort of reaction in which the release is both heat and light.
Here,
The spontaneity can be determined by the equation as:
ΔG=ΔH−TΔS
If the Gibbs free energy is negative, it gives a spontaneous reaction. Hence, the ΔH must be negative and ΔS must be positive.
If the Gibbs free energy is positive then it will be non-spontaneous. Hence, ΔS must be negative at very high temperature.
Therefore, option c is correct that is the ΔH must be negative and ΔS must be positive.
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86. Consider the carbon-nitrogen bonds shown below:
CEN and
Η
Η
|
H-C-N:
||
Η Η
Which bond is shorter? Which is stronger?
Answer: I belive it is HH to h-c-n
Explanation: yea
what are the two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances?
Dimensional evaluation makes use of conversion elements to use the unit in an quantity into an equal amount expressed with a exclusive unit.
For example, a conversion aspect might be used to transform meters to centimeters. Dimensional evaluation (additionally referred to as aspect label approach or unit evaluation) is used to transform from one set of gadgets to another. This approach is used for each simple (ft to inches) and complex (g/cm3 to kg/gallon) conversions and makes use of relationships or conversion elements among exclusive units of gadgets. A conversion ratio (or unit aspect) is a ratio same to one. This ratio includes the names of the gadgets for use withinside the conversion. It may be used for conversions in the English and Metric Systems, in addition to for conversions among the systems. The conversion unit is primarily based totally upon the idea of equal values.
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which of the folowing molecules has the most polar bond between the bonded atoms in terom of greatedst end
The correct response is b) N - H. Because nitrogen is one of the most electronegative elements in the periodic table, its bond with hydrogen will be the most polar of all.
What exactly is a polar bond?A polar covalent bond is a covalent association in which the atoms' electron attraction is uneven, resulting in unequal electron sharing. In a polar covalent bond, also known as a polar bond, the distribution of electrons surrounding the molecule is no longer symmetrical. Polar covalent bonds have an unequal distribution of electrons. The difference in electronegativity between the two elements would be between 0.4 and 1.7. The electronegativity gap between polar and nonpolar bonds is less than 0.4.
In this case, the right answer is b) N - H. Because nitrogen is one of the periodic table's most electronegative elements, its bond with hydrogen will be the most polar of all.
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Why does the water creep up the paper? Explain this. Draw the molecular interactions associated with the macroscopic observation.
( I only need the drawing to be honest and I would really appreciate it if you could explain it)
Capillary action involves the hydrogen bonding in water.
What is capillary action?We have to note that when we are talking about capillary action, what we mean is the movement of water up the paper. We know that this movement of water would have a lot to do with the kind of intermolecular interaction that is going on.
Note that the water is composed of polar O-H bonds that can be able to interact with the -OH bonds that can be seen in the cellulose that is water and this accounts for the capillary action in water.
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Phosphoric acid, H3PO4, is produced through the reaction between tetraphosphorus decoxide and water. Write an unbalanced formula equation including physical states for the reaction.
P4O10(s) + H2O(l) --> H3PO4(aq)
Phosphoric acid, also known as orthophosphoric acid, is a triprotic acid.It is commonly used in food and beverage production, as well as in fertilizers, detergents, and rust removers.It is produced through a chemical reaction between tetraphosphorus decaoxide and water.The reactants are tetraphosphorus decaoxide (white powder) and water (clear liquid).The resulting product is Phosphoric acid (clear, colorless liquid) which is commonly found in an aqueous state (aq).The chemical equation for the reaction is P4O10(s) + H2O(l) --> H3PO4(aq) (unbalanced)The equation indicates the physical states of reactants and products which is important in performing the reaction.Learn more about Phosphoric acid here:
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How do you measure distance?
We measure distance by using a ruler to measure the distance between the two places.
Distance is defined as the amount of the space between the two place or the things.
Short distances can be measured in centimeters (cm), and the long distances may be measured in kilometers (km). SI unit of the distance is meter (m). Distance is the length of the route between the two points. For example: Distance of a race; it is the length of the track between the starting line and the finishing line.
Maps can also be used to measure the distance. The name of the scale is map's bar scale.
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A student places a sample of a pure metal in a crucible and heats it strongly in air. Data from the experiment are given in the table above. The final mass was determined after the sample was cooled to room temperature. Which of the following statements related to the experiment is correct? (See attached table)
a.) The mass of the sample decreased, so physical changes occurred as the metal first melted and then boiled out of the crucible.
b.) The mass of the sample increased, so a chemical change occurred when bonds formed between the metal and another substance.
c.) There was nothing for the metal to react with, so only a physical change could have occurred.
d.) The sample was only heated, so neither a physical nor a chemical change occurred.
The correct answer is option A. The mass of the sample decreased, so physical changes occurred as the metal first melted and then boiled out of the crucible. The decrease in mass is a result of the metal melting and then vaporizing as it is heated.
What is physical changes?Physical changes refer to changes in the physical properties of a substance without altering its chemical composition. Examples of physical changes include melting, freezing, condensation, vaporization, sublimation, and physical state changes. Physical changes occur when a substance changes from one state of matter to another without a chemical reaction taking place.
This is an example of a physical change, as the material is changed from a solid to a liquid and then to a gas, but its chemical composition remains the same.
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In an experiment, a student places a small piece of pure Mg(s) into a beaker containing 250. mL of 6.44 M HCL(aq). A reaction occurs, as represented by the equation above
Answer:
The net ionic equation of the given reaction is:
Mg (s) + 2 H⁺ (aq) → Mg²⁺ (s) + H2 (g)
Explanation:
When magnesium metal (Mg) is treated with hydrochloric acid (HCl), then it displaces the hydrogen gas from the acid
.- Magnesium gets attached with the chlorine and hydrogen gas is evolved as a product in the reaction.
- We have not mentioned chlorine in the reaction as it is not undergoing any change during the reaction.
Consider the below electrochemical cell at standard conditions. Which of the following changes
would result in a voltage larger than 1.29 V?
4MnO4- (aq) + 4H+ (aq) + 4MnO2 (s) + 3O2 (g) + 2H2O E° = 1.29 V
a. Increase the partial pressure of oxygen gas.
b. Increase the mass of solid manganese(IV) oxide present.
C. Increase the pH.
d. Increase the concentration of potassium permanganate.
girl i need help with this toofrom the electrochem lab :(
funny how i found this
Vines grow straight until they find something to grow around. What is
responsible for this adaptation?
Answer:
No matter how a seed is planted, the root will orient itself towards the pull of gravity in the downward direction. This is known as geotropism.
A compound is found to contain 59.94 % carbon, 13.44 % hydrogen, and 26.62 % oxygen by mass. What is the empirical formula for this compound
The empirical formula for this compound containing 59.94 % carbon, 13.44 % hydrogen, and 26.62 % oxygen by mass is C3H8CO.
Given the % of carbon = 59.94%
The % of hydrogen = 13.44%
The % of oxygen = 26.62%
If a percentage is provided, we will assume that the entire mass is 100 grams. As a result, each element's mass is equal to the percentage indicated. Then
the mass of carbon (m1) = 59.94g
The mass of hydrogen (m2) = 13.44g
The mass of oxygen (m3) = 26.62g
We know the molar mass of C = 12 g/mole
The Molar mass of H = 1 g/mole
The Molar mass of O = 16 g/mole
The moles of carbon = 59.94/12 = 4.995
The moles of hydrogen = 13.44/1 = 13.44
The moles of oxygen = 26.62/16 = 1.664
Divide each mole value by the lowest computed mole number to get the mole ratio.
For C = 4.995/1.664 = 3 , For H = 13.44/1.664 = 8 and For O = 1.664/1.664 = 1. Then the empirical formula = C3H8CO
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Fill in the blanks (Balancing chemical reactions)
BRAINLIEST
[tex] \huge{ \mathfrak{ \underline{ Answer \: \: ✓ }}}[/tex]
The 2 in front of [tex]Na[/tex] in [tex]2Na + Cl_2 \rightarrow 2NaCl [/tex] is Coefficient.
_____________________________
The [tex] _2 [/tex] after [tex] Cl_2[/tex] in the same equation is sub script.
_____________________________
There are two atoms of [tex]Na[/tex] in [tex]2NaCl[/tex]
_____________________________
[tex]\mathrm{ \#TeeNForeveR}[/tex]
Which of the following is a true statement?
Work is not needed to create electricity.
Electricity has the ability to do work.
All work requires electricity.
Electricity prevents work from occurring.
Answer:
Electricity has the ability to do work. b. hope dis helps
Explanation:
What are the products in this chemical reaction?
A. CO2 + 2H2O + ENERGY
THIS IS THE ANSWER
How many atoms are there in a 2 moles of oxygen atoms? How many atoms are there in 2 moles of oxygen molecules?
For 2 moles of oxygen atoms, there are Avogadro's number (6.022 x 10^23) atoms. For 2 moles of oxygen molecules, there are twice that amount, or 12.044 x 10^23 atoms.
What are Atoms?
Atoms are the smallest particle of any element that still maintains the properties of that element. Atoms are made up of a nucleus surrounded by one or more electrons. The nucleus is composed of protons and neutrons, and the electrons orbit around the nucleus. Atoms of different elements have different numbers of protons, neutrons, and electrons, which is what gives them their unique properties.
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plastic don't react with
Answer:
Most plastic is chemically inert and will not react chemically with other substances -- you can store alcohol, soap, water, acid or gasoline in a plastic container without dissolving the container itself.
Explanation:
Answer:
Most plastic is chemically inert and will not react chemically with other substances -- you can store alcohol, soap, water, acid or gasoline in a plastic container without dissolving the container itself.
Explanation:
Hope it helps u
FOLLOW MY ACCOUNT PLS PLS
water is added to 5g of nacl, resulting in a total solution volume of 100 mL. what is the molarity of the nacl solution
A total volume of 100 mL of solution is created by mixing 5g of NaCl with water. The NaCl solution has a molarity of 0.151515.
Weight of NaCl=5 gm.
No.of moles of NaCl = Weight/ Mole .Wt =5/58.5= 0.08547
Weight of water= 100 gm.
Number of water moles = Weigh/Mole Wt =100/18=5.55556
Mole. Fraction of NaCl
=No.of moles of NaCl/ No.of molesNaCl+H2O =0.08547/(0.08547+5.55556)
=0.08547/5.64103 =0.151515
The amount of moles of a solute in a litre of solution is known as its molarity. A capital M is used to represent molarity.
A solution in chemistry is a combination of two or more compounds in which neither ingredient undergoes a chemical transformation. For instance, salt water is a solution that contains both salt and water (the solvent) (the solute). The concentration of a material in a solution is its amount of dissolution. In other words, it refers to the number of ingredients that have been added to your drink. In molarity, concentration is often expressed.
A mole is a fundamental chemical unit. It is the mass of a substance (in grammes) that has the same number of atoms, molecules, or ions as 12 grammes (6.022 x 1023) of carbon-12.
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The gravitational pull of the sun does not affect the tides. true or false
Answer:
[tex]\huge\mathfrak\red{Answer...} \\ \\ \huge\mathfrak\purple{true} \\ \\ \huge\mathfrak\pink{hope \: it \: helps...}[/tex]
A ring stand is used to ________ devices during laboratory procedures.
A ring stand is used to hold glassware devices during laboratory procedures.
Ring stands and accessories can make your lab experiments much easier if you are studying chemistry or physics.
A ring stand and its accessories are versatile pieces of equipment that will improve your hands-on activities by allowing you to conveniently heat beakers, flasks, test tubes, and other glassware over an alcohol burner, as well as set up physics apparatus such as moveable pulleys and inclined planes.
Each accessory is supported by a heavy base and an upright rod on the ring stand. To support additional equipment, a ring support is attached to the stand. Glassware is supported above an alcohol burner by wire gauze resting on the ring. To support funnels, crucibles, and evaporating dishes, the triangle rests on the ring. Burettes and test tubes are held in the burette clamp.
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aseous ammonia chemically reacts with oxygen gas to produce nitrogen monoxide gas and water vapor. Calculate the moles of ammonia needed to produce 1.3 mole of water
The moles of ammonia needed to produce 1.3 mole of water is 0.84 mol.
balance chemical equation for the reaction
[tex]4NH_{3}+5O_{2}- > 4NO +6H_{2}O[/tex]
In chemistry, stoichiometry is the measurement of the ratios in which different substances or elements interact. The laws of conservation of mass, energy, and weights or volumes serve as the foundation for the rules used to determine stoichiometric relationships.
stoichiometric moles of ammonia reacting = [tex]\frac{moles}{stoichiometry}[/tex]
stoichiometric moles of water reacting = [tex]\frac{1.3}{6} =0.21[/tex]
0.21 stoichiometric moles of water is given by 0.21 stoichiometric moles of water
so moles of ammonia will form = stoichiometric moles * stoichiometry
moles of ammonia will form = 0.21 * 4 = 0.84 mol
so moles of ammonia produced by reaction = 0.84 mol
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