The periodic repetition of properties of elements is due to the regular arrangement of electrons in the atoms of those elements. This regular arrangement is known as the "periodic table" of elements. This is due to the behavior of electrons in atoms and the increasing number of valence electrons as atomic number increases, resulting in a regular pattern of electron configurations and properties.
Elements are arranged in the periodic table according to increasing atomic number. Elements in the same vertical row (group) have similar chemical and physical properties, and elements in the same horizontal row (period) have similar electronic configurations of their atoms.
The reason for this repeating periodic property is the behavior of the electrons in the atoms. As the atomic number increases, the number of protons in the nucleus increases, and the number of electrons in the atom increases. These electrons occupy different energy levels or shells around the atomic nucleus. The outermost shell electrons, the so-called valence electrons, are responsible for the chemical behavior of atoms and participate in chemical bonds. As the atomic number increases, the number of valence electrons in the atom increases. This results in a regular pattern of electron configurations and thus a regular pattern of properties.
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Find Delta S for the formation of 1 mole of PCl5(g) from its elements.
____ J/K
Answer:
I don't know I am sorry
sodium is lost from the body in the ______.
Answer: In the sweat and urine
Explanation:
Sodium is part of body's mineral. It will easily go out or lose when we we sweat and when we urinate. They lost from the body in form of water contained sodium.
i am boréd wanna chàt
yeah same I'm bóred too -,-
Answer:
sure hi ...............................
4 The Mr of sodium hydroxide is 40. How many grams of sodium hydroxide are there in: a 500 cm³ of a molar solution? b 25 cm³ of a 0.5 M solution?
There are 20 grams of Sodium hydroxide in a molar solution that has a volume of 500 cm3.
Sodium hydroxide – what is it? (NaOH)Caustic soda and lye are two other names for sodium hydroxide. It is a typical component of soaps and cleansers. Sodium hydroxide seems to be a white, unscented solid at room temperature. Sodium hydroxide is a colorless, odorless liquid. Strong acids and water can cause explosive reactions with it.
Molarity is calculated by
moles (solute) / volume of solution in L
No. of moles = mass / molar mass
We have to find mass of sodium hydroxide (NaOH)
As we know, in 1 L (1000 cm³) of molar solution there is 40 gram of NaOH present.
From using this statement, 500 cm³ of a molar solution, means half liter of a molar solution contain -
= 40 / 2
= 20 gram of NaOH.
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Select the correct answer.
How does activation energy affect a chemical reaction?
A. It increases the energy of the reactants.
B. It determines how difficult it is to start the reaction.
C. It determines how much product can form,
D. It decreases the energy of the products,
Answer:
The source of the activation energy needed to push reactions forward is typically heat energy from the surroundings.
Explanation:
The activation energy of a particular reaction determines the rate at which it will proceed. The higher the activation energy, the slower the chemical reaction will be
Baed on thi information, which type of light i more likely to damage the material?
Based on the information, UV light is more likely to damage the material.
Which kind of light has the greatest chance of warming quartz?Due to the fact that the infrared light bounces off the quartz, which increases its energy, the quartz may become warm.
The colors of paper and fabric can deteriorate due to ultraviolet light from the sun. In the presence of ultraviolet light waves, the chemicals in colored dyes can degrade. Sunburns may also result from ultraviolet radiation.
Paper and other organic materials will deteriorate, bleach, and deteriorate due to ultraviolet radiation. All of these modifications may reduce readability, affect how well artwork is regarded for its aesthetic qualities, and restrict access to the information it contains.
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what are local winds. be more detailed. and in your own words
Answer:
High and low pressure regions form when there is a large temperature difference between the surface of the sea (or a large lake) and the land next to it. Local winds are created as a result of this. Warmer air from the ocean rises and then sinks on land, causing the temperature to rise over the land.
The reaction 2NO(g) + O2(g) → 2NO2(g)
has the following rate law: Rate = k[O2][NO]2.
the order of [NO] is
The order of [NO] is 2.
The rate law for a chemical reaction is an equation that describes how the rate of the reaction changes with respect to the concentrations of the reactants. In this case, the rate law for the reaction 2NO(g) + O2(g) → 2NO2(g) is Rate = k[O2][NO]^2.
The order of a reactant in a rate law is determined by the exponent to which its concentration is raised. In this case, the concentration of NO is raised to the power of 2, so the order of [NO] is 2. This means that the rate of the reaction is directly proportional to the square of the concentration of NO. Therefore, as the concentration of NO increases, the rate of the reaction will increase at a faster rate.
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What is the mass in grams of 6.02 x10 23 N 2 molecules?
The mass in grams of 6.02×[tex]10^{23}[/tex] N2 molecules is 9.24×[tex]10^{23}[/tex] gram.
This is because each molecule of N2 is composed of two atoms of nitrogen, which each have a mass of 14.0067 grams.
Thus, the total mass of 6.022×[tex]10^{23}[/tex] N2 molecules is calculated by multiplying the number of molecules by the mass of each molecule, which is 28.0134 grams.
14.0067×2=28.013grams
This gives us a total mass of
6.02×1023×28.0134=9.24×[tex]10^{23}[/tex] grams
Molar mass:
Molar mass is the mass of one mole of a substance. It is expressed in grams per mole (g/mol). It is calculated by adding up the atomic weights of all the atoms in a molecule or formula unit of a compound. It is a useful measure when calculating the mass of a substance, or when calculating stoichiometric ratios in a chemical reaction.
Therefore the mass of 6.022×[tex]10^{23}[/tex] N2 molecule is 9.24×[tex]10^{23}[/tex]grams.
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what are standard conditions when working with gases?
Answer:
STP in chemistry is the abbreviation for Standard Temperature and Pressure. STP most commonly is used when performing calculations on gases, such as gas density. The standard temperature is 273 K (0° Celsius or 32° Fahrenheit) and the standard pressure is 1 atm pressure.
How many grams of chlorine gas react when 266.28 grams of aluminum reacts
Answer:
We can answer this question if the chemical reaction provided to this question is provided to us.
The highest pressure measured in Jupiter's upper atmosphere by the Galileo probe is ×1.67104torr. Calculate the highest pressure measured in mmHg and atm. Round each of your answers to 3 significant digits.
Answer: 16700 mmHg , 22,0 atm
Explanation: 1 torr = 1 mmHg, so p = 16700 torr = 16700 mmHg
1 atm = 101325 Pa = 760 torr
16700 torr / 760 = 21,97 atm
What will a strong base mostly produce in water?
A. H+ ions
B. H3O+ ions
C. OH- ions
D. Cl- ions
Answer:
strong acids fully ionise to produce H+ ions.
weak acid PARTIALLY ionise
strong Base fully ionise to produce OH- ions
weak base partially ionise
thus ans is C
Classify the following alcohols as primary secondary and tertiary alcohols
Following is the list of primary secondary and tertiary alcohols.
Alcohols are chemical compounds made composed of an alkyl or aryl group and a hydroxyl group (ROH). A fundamental alcohol is a hydroxyl carbon with just one R group. If it contains two R groups, it is a secondary alcohol, and if it has three R groups, it is a tertiary alcohol.
Look at the carbon bonded to OH to identify whether an alcohol is primary, secondary, or tertiary. The alcohol is primary, secondary, or tertiary depending on how many other carbons are connected to that carbon. It is methanol if there are three hydrogens and no carbons, which is a rare combination.
For the given formulas, following are different types of alcohols -
a) Primary Alcohols
b) Tertiary Alcohol
c) Secondary Alcohol
d) Primary Alcohol
e) Primary Alcohol
f) secondary Alcohol
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please help me fast
Answer:
1..) The property by the virtue of which the metals can be beaten into sheets.
Malleability.
2.
I.Reaction of iron with copper sulphate solution
ii.
Iron metal displaces copper from its compound copper sulphate and forms iron sulphate along with copper metal. This reaction is a displacement reaction.
Reaction:
Fe(Iron)+CuSO4(Copper Sulphate)-------FeSO4(Ferrous Sulphate)+Cu(Copper)
Why do you think seasons last for different amounts of time on different planets? *
A : They are far away from the Sun B: They have different orbits around the Sun C: They are different temperatures D: They are in different solar systems ?
Here's link[tex]^{}[/tex] to the answer:
bit.[tex]^{}[/tex]ly/3gVQKw3
Answer:
B
Explanation:
HOW TO DO THIS QUESTION PLEASE
Answer:
-mass number
-Iodine was placed after tellurium because it has a lower atomic mass
The pressure of a 5.2mol sample of C3H8 in a 35.3 L container is measured to be 5.5 atm. What is the temperature of this gas in kelvins?
Answer:
T° = 453.6 K
Explanation:
Let's apply the Ideal Gases Law to solve the question:
Pressure . Volume = number of moles . R . T°
We replace data:
5.5 atm . 35.3L = 5.2 mol . 0.082 L.atm/mol.K .T°
T° = (5.5 atm . 35.3L) / (5.2 mol . 0.082 L.atm/mol.K)
T° = 453.6 K
The Ideal Gases Law contains the Absolute value of T° (Kelvin degrees)
So the final answer is: 453.6 K
You can also determine this, because the unit of R (Ideal Gases constant)
Select the correct answer. the zeroth law of thermodynamics describes the state where we can say what about the movement of heat between two substances?
a. the latent heat is increasing
b. the movement of heat is rapid
c. there is no movement of heat
d. the latent heat is decreasing
e. the movement of heat is slow
The zeroth law of thermodynamics describes the state where we can say what about the movement of heat between two substances
The Zeroth Law of thermodynamics is a basic law that describes the state in which two bodies are in thermal equilibrium. It states that if two bodies are in thermal equilibrium with a third body, then they are in thermal equilibrium with each other. In other words, it allows us to determine if two bodies are at the same temperature and if there is no heat flow between them. So, it describes the state where there is no movement of heat between two substances.
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How many gram i hydrogen ga (H2) are in 2600 ml comtainer at 35 degree celiu and a preure of 165 mmHg
108gm of hydrogen gas is present in2600ml container at 35-degree Celsius and at pressure of 165mm Hg.
Given data:
water = 2600ml
temp = 35°C & 95k
pressure = 165mm Hg & 0.162atm
From given information we apply ideal das equation to get moles.
PV = nRT
0.162atm * 2600ml = n 0.0821 * 95k
n = 54
Now we know 1 mole of hydrogen contain 2.016gm hydrogen.
In 54 moles we have 108gm hydrogen.
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A sample of fluorine gas at STP contains 4.088x10^24 atoms. What is the volume in liters of the sample?
Record your answer to 1 decimal place. Do not put units on your answer.
According to the concept of Avogadro's number and STP conditions volume in liters of the sample is 15,388.7.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
Number of moles is obtained as, number of atoms/Avogadro's number=4.088×10²⁴/6.023×10²³=6.78 moles on substitution in formula of PV=nRT=V=6.78×8.314×273/1=15,388.7 liters.
Thus, the volume is 15,388.7 liters of the sample.
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Diatomic elements are important. what makes them different from other elemental substances?
Diatomic elements are elements that exist as molecules composed of two atoms of the same element.
What is Diatomic?Diatomic molecules are molecules composed of two atoms, such as Oxygen (O2), Hydrogen (H2), Nitrogen (N2), and Fluorine (F2). Diatomic molecules are the most common type of molecules in nature and are found in all three states of matter (solid, liquid, and gas). Diatomic molecules contain only two atoms and do not contain any other elements or molecules.
This is in contrast to other elemental substances, which exist as individual atoms or molecules composed of different elements. Diatomic elements have unique chemical and physical properties due to the strong bond between the two atoms.
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The unheated gas in the above system has a volume of 20.0L
at a temperature of 25.0 °C and a pressure of 1.00 atm. The
gas is heated to a temperature of 100.0 °C while the volume
remains constant. What is the pressure of the heated gas?
Ignore the block labeled "A".
da Hint?
Answer:
need more info on block labeled ''A''
Explanation:
What is the car doing
Answer: Moving?
Explanation:
Why is bromine the most reactive?
Being a highly chemically reactive metal having seven valence electrons and even a high attraction for electrons, bromine reacts quickly as well as violently with alkali metals, therefore is rarely found in nature pure.
Despite being a potent oxidizer, it is difficult to break down under typical circumstances. Fluorine was the strongest active halogen, followed by chlorine, bromine, as well as iodine.
Since bromine has a higher atomic radius over chlorine, it is much less reactive. Compared to chlorine, bromine does not hold electrons as tightly. This is supported by the fact that chlorine contains fewer electron shells, which causes the electrons to connect nearer to the nucleus.
Due to its lower reactivity, the bromine radical is so much more selective for such 2° radical. Cl• is much less picky and less selective since it is less stable as well as more reactive.
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(50 points help ASAP it’s due 10mins)About how much more TE does it take to change the temperature of 1 kg of water compared to 1 kg of iron?
A. 5:L1
B. 12:1
C. 9:1
D. 2:1
Answer:c
Explanation:
Describe the physical properties of matter using the graphic organizer below
indicate whether each property can be used to identify a substance, $6.6.864
Mass
Weights
Mass and Weight
Magnetism
Density
A quality of matter that is unrelated to a change in its chemical makeup is called a physical property. Density, color, hardness, melting and boiling points, and electrical conductivity.
What are the physical characteristics of matter and what do they mean?A quality of matter that is unrelated to a change in its chemical makeup is called a physical property. Density, color, hardness, melting and boiling points and electrical conductivity are a few common examples of physical qualities.
What matters? Give five instances of matter.A substance with a given mass and a certain volume in space is referred to as matter. Examples of matters are pens, pencils, toothbrushes, water, and milk, as well as vehicles like cars, buses, and bicycles. Therefore, the matter is divided into two categories: living and non-living.
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Physical properties are characteristics of matter that are independent of changes in its chemical composition. Electrical conductivity, hardness, melt and boiling points, and density.
What do matter's physical properties signify, and what are they?Physical properties are characteristics of matter that are independent of changes in its chemical composition. Physical characteristics include things like density, color, durability, melting , boiling temperatures, and electrical conductivity, to name a few.
Which matters? Give five examples of the subject.Matter is defined as a material having a certain mass and spatial volume. Pencils, pencils, toothbrushes, water, milk, as well as automobiles, buses, and bicycles, are examples of matters.
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The chemical equation shows the production of magnesium chloride.
Mg + 2HCl → MgCl2 + H2
How many grams of H2 will be produced from 12 grams of Mg?
Answer:
1 gram of H2 will be produced from 12 grams of Mg.
Explanation:
According to Stoichiometry, 0.5 moles of Mg are present. 1 mole of Mg produces 1 mole of H2, so 0.5 moles of Mg will produce 0.5 moles of H2. Multiplying molar mass of H2 i.e. 2 gram/mole with 0.5 moles, we can find the mass of H2 in grams which is 1 gram.
why was the bohr model replaced
To solve this we must be knowing each and every concept related to atom. Therefore, Bohr's model was abandoned since it lacked explanatory, descriptive, and predictive ability.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. Bohr's model was abandoned in favor of the quantum mechanical model since it lacked explanatory, descriptive, and predictive ability.
Therefore, Bohr's model was abandoned since it lacked explanatory, descriptive, and predictive ability.
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A balloon originally had a volume of 6.5 L at 280 K the volume must be cooled to ___K to reduce volume to 3.3
Answer:
[tex]\boxed {\boxed {\sf 142.2 \ K}}[/tex]
Explanation:
This problem asks us to find the temperature change necessary to make the volume change. We use Charles's Law which states that temperature is directly proportional to the volume of a gas. The formula is:
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
We know the balloon originally had a volume of 6.5 liters and a temperature of 280 Kelvin. Then, the temperature was cooled so the new volume is 3.3 liters. However, the exact new temperature is unknown.
Substitute all known values into the formula.
[tex]\frac {6.5 \ L}{280 \ K}=\frac{3.3 \ L}{T_2}[/tex]
Now, solve the new temperature (T₂). First, cross multiply. Multiply the 1st numerator by the 2nd denominator. Then, multiply the 1st denominator by the 2nd numerator.
[tex]280 \ K * 3.3 \ L = 6.5 \ L * T_2[/tex]
Multiply the left side.
[tex]924 \ K *L=6.5 \ L *T_2[/tex]
We must isolate the variable. Currently, it is being multiplied by 6.5 liters. The inverse of multiplication is division. Divide both sides by 6.5 L.
[tex]\frac { 924 \ K*L}{6.5 \ L}= \frac{ 6.5 \ L *T_2}{ 6.5 \ L}[/tex]
[tex]\frac { 924 \ K*L}{6.5 \ L}= T_2[/tex]
The units of liters (L) cancel.
[tex]\frac { 924 \ K}{6.5 }= T_2[/tex]
[tex]142.153846 \ K= T_2[/tex]
Let's round to the nearest tenth place. The 5 in the hundredth place tells us to round the 1 up to a 2.
[tex]142.2 \ K= T_2[/tex]
The temperature must be cooled to approximately 142.2 Kelvin.