Which statement best explains why different gases effuse at different rates?

The enthalpy change (ΔH) for the reaction CaC(s) + H2O(I) → Ca(OH)(ag) + CH4(g) is -3617.6 kJ.

To calculate ΔH for the reaction CaC(s) + H2O(l) → Ca(OH)2(ag) + CH4(g), we can use Hess's law, which states that the enthalpy change of a reaction is independent of the pathway taken and depends only on the initial and final states.

We can manipulate the given reactions to obtain the desired reaction:

(i) Ca(s) + 2C(graphite) → CaC2(s) ΔH = X (unknown value)

(ii) Ca(s) + 1/2O2(g) → CaO(s) ΔH = -635.5 kJ

(iii) CaO(s) + H2O(l) → Ca(OH)2(ag) ΔH = -653.1 kJ

(iv) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH = -1300.0 kJ

(v) C(graphite) + 1/2O2(g) → CO(g) ΔH = -393.5 kJ

Now, let's manipulate these equations to cancel out the common reactants and products and obtain the desired reaction:

(i) Ca(s) + 2C(graphite) → CaC2(s) ΔH = X

(ii) Ca(s) + 1/2O2(g) → CaO(s) ΔH = -635.5 kJ

(iii) CaO(s) + H2O(l) → Ca(OH)2(ag) ΔH = -653.1 kJ

(iv) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH = -1300.0 kJ

(v) C(graphite) + 1/2O2(g) → CO(g) ΔH = -393.5 kJ

Now, let's sum up the equations to obtain the desired reaction:(i) Ca(s) + 2C(graphite) → CaC2(s) ΔH = X

(ii) 2Ca(s) + O2(g) → 2CaO(s) ΔH = -1271 kJ

(iii) CaO(s) + H2O(l) → Ca(OH)2(ag) ΔH = -653.1 kJ

(iv) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH = -1300.0 kJ

(v) C(graphite) + 1/2O2(g) → CO(g) ΔH = -393.5 kJ

By adding equations (ii), (iii), (iv), and (v), we can cancel out CaO(s), H2O(l), and O2(g):

2Ca(s) + 2C(graphite) + CH4(g) → 2Ca(OH)2(ag) + CO(g) ΔH = X -1271 -653.1 -1300.0 -393.5

2Ca(s) + 2C(graphite) + CH4(g) → 2Ca(OH)2(ag) + CO(g) ΔH = X -3617.6 kJ

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They have the same number of electrons in their outermost shells.---Nitrogen & Phosphorus

2. They have two electron shells.----Carbon & Nitrogen

3. Their outermost electron shell is full.---Helium & Argon

4. They have one electron shell. ----Hydrogen & Helium

5. They have three electron shells.-----Sodium & Chlorine

The protons in the carbon atom's nucleus attract the two valence electrons of both oxygen atoms. They form a double covalent bond because they both have a lot of attraction and room for electrons.

Nonmetal atoms are the only ones that can form covalent bonds. A covalent bond can bind two atoms from the same element or from different elements together. A covalent compound is formed when elements' atoms join together.

Incomplete question :

Match the following pairs of atoms with the statement that correctly describes both atoms in the pair.

1. They have the same number of electrons in their outermost shells.

2. They have two electron shells.

3. Their outermost electron shell is full.

4. They have one electron shell.

5. They have three electron shells.

Pairs given :

Helium & Argon

Nitrogen & Phosphorus

Carbon & Nitrogen

Hydrogen & Helium

Sodium & Chlorine

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If the replacement of a base in the DNA sequence results in mRNA with a codon that codes for a different amino acid, then the order of the amino acids is affected.

DNA is an abbreviation for deoxyribonucleic acid and it can be defined as a group of molecules that are found within cells and they are saddled with the responsibility of storing genetic information in all living organisms.

In Genetics, translation can be defined as a cellular process through which a genetic code from a sequence of messenger ribonucleic acid (mRNA) molecule is decoded or translated to a specific sequence of amino acids, during the synthesis of protein.

Additionally, a codon simply refers to a sequence of three (3) consecutive nucleotides that act as a genetic unit of life and it is used as a template for the amino acid synthesis which is generally required for protein expression in living organisms.

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It's answer is c. N2

The maximum bond energy is of N2 because N2 molecule is formed by 3 covalent bonds and O2 molecule is formed by 2 covalent bonds.

Hope it helps :)

You would recover 36.525g of NaCl after evaporating all of the water.

To find the grams of NaCl that would be recovered after evaporating all the water, we can use the following formula:

mass = moles * molar mass

Where:

Moles = Molarity * Volume

Molarity = 0.250 M

Volume = 2500.0 mL = 2.5 L

Molar mass of NaCl = 58.44 g/mol

mass = 0.250 M * 2.5 L * 58.44 g/mol

mass = 36.525 g

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Answer:

hydrocarbon

Explanation:

it reacts with oxygen to produce water and carbon dioxide.

hope this helps.

Answer:

Chemical properties of each element are determined by the element's electronic configuration, and particularly by its outermost valence electrons. .

Answer:

you need to state the options

V.) a)Empirical formula of naphthalene is C5H4. b)Empirical formula of benzene is CH. VI)a)Na2SO4 (aq) + Ca(NO3)2 (aq) → CaSO4 (s) + 2NaNO3 (aq); b)3Mg (s) + N2 (g) → Mg3N2 (s) VII)a)2Hg(NO3)2 (s) → 2Hg (l) + O2 (g) + 2NO2 (g) b)Ca3(PO4)2 (s) + 3H3PO4 (aq) → 6CaHPO4 (s)  c)FeCl3 (aq) + 3NaOH (aq) → Fe(OH)3 (s) + 3NaCl (aq)

Process that leads to the chemical transformation of one set of chemical substances to another is called chemical reaction.

V) a) Ratio of carbon to hydrogen atoms can be found by dividing each atom count by the greatest common factor (GCF) of the two numbers.

GCF of 10 and 8 is 2.

10/2 = 5 and 8/2 = 4.

Empirical formula of naphthalene is C5H4.

b) For benzene, the ratio of carbon to hydrogen atoms can be found by dividing each atom count by their GCF, which is 6.

6/6 = 1 and 6/6 = 1.

Empirical formula of benzene is CH.

VI)a) Chemical equation for the reaction is:

Na2SO4 (aq) + Ca(NO3)2 (aq) → CaSO4 (s) + 2NaNO3 (aq)

Reactants: Na2SO4 (aq) and Ca(NO3)2 (aq)

Products: CaSO4 (s) and 2NaNO3 (aq)

Type of reaction: Double displacement or metathesis reaction

b) Chemical equation for the reaction is:

3Mg (s) + N2 (g) → Mg3N2 (s)

Reactants: 3Mg (s) and N2 (g)

Product: Mg3N2 (s)

Type of reaction: Combination or synthesis reaction

VII)a) The balanced chemical equation :

2Hg(NO3)2 (s) → 2Hg (l) + O2 (g) + 2NO2 (g)

b) Balanced chemical equation:

Ca3(PO4)2 (s) + 3H3PO4 (aq) → 6CaHPO4 (s)

c) Balanced chemical equation :

FeCl3 (aq) + 3NaOH (aq) → Fe(OH)3 (s) + 3NaCl (aq)

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Answer:

hhh

Explanation:

The SO2 Lewis structure would consist of two oxygen (O) atoms and one sulfur atom.

Both the sulfur and oxygen atoms have six reactivity electrons. The molecular geometry of sulfur dioxide is a bent form. The sulfur-to-oxygen ratio in sulfur dioxide. Sulfur dioxide and SiCl4 have 1 lone pair and 2 bond pairs.SO2 molecular addition is considered to V-shaped or bent. otherwise, the electron geometry of sulfur dioxide is in the shape of a trigonal planar. The three pairs of bonding electrons lie at an angle of 119o.

The bond sequence and 1.2 in SO2 and the sulfonyl group, separately. Thus, electrostatic forces (and not multiple covalent bonding) give more to the SÀO bond shortening. In the SO2 lewis structure, there are two double bonds linking the sulfur atoms and oxygen atoms. The sulfur dioxide lewis structure is drawn step by step using VESPR

So we can conclude that The electron dot form of the SO2 molecule is also known as the SO2 Lewis structure.

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Answer:

the light would be less bright

Explanation:

A food chain refers to the order of events in an ecosystem, where one living organisms eats another organisms and later that organism is consumed by another larger organism. It also explains the feeding pattern.

The food chain is a linear sequence of organisms where the nutrients and energy is transferred from one organism to the other. It begins with the producer and ends with decomposer.

The producers in a food chain consists of all autotrophs like phytoplankton, algae and green plants. It is the producers which utilize the energy from the sun to produce food.

Thus the correct option is B.

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Answer:

A. last  F first E second C thrid b foruth A five

Explanation:

The mass of 1 mole of phosphorus atoms is calculated to be 30 grams.

Mass number of an atom is defined as the sum of total number of protons and neutrons present in an atom. The mass number of any element is calculated by the formula:

Mass Number (A) = Number of Protons + Number of Neutrons

On the other hand, atomic number is defined as the total number of protons present in an atom.

Therefore, it is calculated experimentally that mass number of phosphorous is 30 g/mol whereas atomic number of phosphorous is 15.

Therefore, the mass of 1 mole of phosphorus atoms is 30 grams.

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The energy of a photon of radiation with a frequency of 9.50 × 10¹³ Hz is 6.3 × 10⁻²⁰ J.

The Energy that comes from electromagnetic radiation is quantized, It exists in the form of small energy packets known as photons.

The energy of a photon is depends on the frequency at which it propagates from radiation source.

We can calculate the energy of a photon by the equation given below:

E = hν

where, E is the energy of photon

h is Plancks's constant whose value is 6.626 × 10⁻³⁴ Js

ν is the frequency of the radiation.

According to the question,

given,

frequency ν = 9.50 × 10¹³ Hz

therefore,

E = 6.626 × 10⁻³⁴ Js ×  9.50 × 10¹³ Hz      (∵1 Hz = 1s⁻¹)

E = 6.2947 × 10⁻²⁰ J

E≈ 6.3 × 10⁻²⁰ J

Thus, energy of the photon is 6.3 × 10⁻²⁰ J

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Answer:

2nd one

Explanation:

The rate is reduced by a factor of 3/4, or 0.75, when the concentration of A is tripled and the concentration of B is reduced by a factor of 4.

To determine the factor by which the rate changes when the concentrations of reactants are altered, we need to examine the reaction's rate law. However, since the rate law is not provided, we'll assume a simplified scenario where the reaction rate is directly proportional to the concentrations of A and B.

Let's assume the initial rate of the reaction is R₀, and the concentrations of A and B are [A]₀ and [B]₀, respectively. According to the assumed rate law, the rate can be expressed as:

Rate = k[A][B]

Now, let's consider the changes in concentrations and calculate the new rate.

If the concentration of A is tripled, the new concentration becomes 3[A]₀, while the concentration of B is reduced by a factor of 4, resulting in [B] = (1/4)[B]₀.

The new rate (R) can be calculated as follows:

R = k[3[A]₀][(1/4)[B]₀]

= (3/4)k[A]₀[B]₀

= (3/4)R₀

Therefore, the rate is reduced by a factor of 3/4, or 0.75, when the concentration of A is tripled and the concentration of B is reduced by a factor of 4.

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The names of the positions are called:

(1) (10) Atomic number

(2) (11) Chemical symbols

(3) (12) Elements

(4) (13) Atomic mass

Atomic structure refers to the composition and arrangement of subatomic particles within an atom. An atom consists of a central nucleus, which contains positively charged protons and uncharged neutrons, surrounded by negatively charged electrons that move around the nucleus in shells or energy levels.

The number of protons in the nucleus determines the atomic number and thus the identity of the element. The arrangement of electrons around the nucleus determines the chemical and physical properties of the element.

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The questions are:

10 What is the name for the number in this position called? (the answer is not "6") →6

11 What is the name for the letter in this position called? (the answer is not "C"!) →C

12 What is the name in this position called? (the answer is not "Carbon"!) →Carbon

13

What is the name for the number in this position? (the answer is not "12.0") →12.0

Use the spaces below to type your answers to the questions above.

The given chemical equation, 2N₂ + 3H₂ <==>2NH3, is an example of a reversible reaction.option A.

The double arrows between the reactants and products indicate that the reaction can proceed in both directions, forming both products and reactants.The reversible reaction, also known as a chemical equilibrium reaction, refers to a chemical reaction that can occur in both forward and reverse directions. It occurs when reactants are converted into products, and the products are also converted back into the original reactants.A reversible reaction can be identified by the symbol “<==>” or “⇌” that appears between the reactants and products in the chemical equation. It denotes that the reaction is in a state of chemical equilibrium. When the reactants and products have achieved equilibrium, the rate of the forward and reverse reactions is equal, and there is no further net change in the amounts of the reactants and products.A combustion reaction is a type of exothermic reaction in which a substance reacts with an oxidizing agent to produce heat and light. A one-way reaction is a type of reaction that occurs in only one direction and cannot be reversed without significant changes to the reaction conditions, such as changing the temperature or pressure.A reversible reaction, unlike a one-way reaction, can occur in both directions and reach equilibrium when the forward and reverse reaction rates are equal.option A.

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3 × 10²⁴ atoms Cd

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Step 1: Define

5 mol Cd (Cadmium)

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 1 sig fig.

3.011 × 10²⁴ atoms Cd ≈ 3 × 10²⁴ atoms Cd

Considering the definition of molar mass, the correct answer is option c): the mass of 1.85 moles H₂O₂ is 62.9 grams.

The molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.

The molar mass of a compound is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.

In this case, you know the molar mass of the elements is:

So, the molar mass of the compound H₂O₂ is calculated as:

H₂O₂= 2× 1 g/mole + 2× 16 g/mole

Solving:

H₂O₂= 34 g/mole

You can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 34 grams, 1.85 moles of the compound contains how much mass?

mass= (1.85 moles× 34 grams)÷ 1 mole

mass= 62.9 grams

Finally, the mass of 1.85 moles H₂O₂ is 62.9 grams.

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The oxidation state of nitrogen (N) in NaNO3 is +5. option B

To determine the oxidation state of nitrogen (N) in sodium nitrate (NaNO3), we need to assign oxidation numbers to each element in the compound.

In NaNO3, we know that the sodium ion (Na+) has a +1 oxidation state because it is an alkali metal. Oxygen (O) typically has an oxidation state of -2 in compounds, and there are three oxygen atoms in NaNO3. Since the compound is neutral, the sum of the oxidation states must be zero.

Let's assume that the oxidation state of nitrogen is x. Therefore, we can set up the equation:

(+1) + x + (-2) * 3 = 0

Simplifying the equation:

+1 + x - 6 = 0

x - 5 = 0

x = +5

Therefore, the oxidation state of nitrogen (N) in NaNO3 is +5.

The oxidation state of an element indicates the number of electrons it has gained or lost in a compound. In this case, the nitrogen atom in NaNO3 has gained five electrons to achieve a stable oxidation state of +5.

It is important to note that oxidation states are formal charges and do not necessarily represent the actual distribution of electrons in a compound. They are assigned based on a set of rules and can be useful in understanding the reactivity and behavior of elements in chemical reactions.

Option B

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Draw cyclohexanol with a double bond and without the OH- group. next draw water

Two atoms sharing two sets or electrons result in a double bond. Always shared in pairs, electrons. Covalent bonds are referred to as each shared electron pair. A double bond between two atoms requires more energy to break than a single bond because four electrons are divided between the two atoms in a dual bond.

When two atoms join one couple of electrons, they form a single bond; when they share two pairs, they form a double bond (four electrons). To form triple bonds, three pairs free electrons (six atoms) share space.

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The balanced chemical equation for the reaction is: H2SO4 + 2KOH → K2SO4 + 2H2O. It can be concluded that the basicity of tetraoxosulphate VI acid is 2.

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