An atom’s chemical behavior is determined mostly by its _______. A. number of protons B. number of neutrons C. number of electrons D. number of valence electrons E. None of the Above

Answer:

it is equivalent to the erosion of the rocks.

Explanation:

It can be said that the process of dissolving a rock is equivalent to the erosion process because erosion is the wear and tear on the rocks that is produced by the action of wind and water in their different forms. This wear is produced by the dragging of the particles from the rocks, produced by the impact of the particles that are moved in the medium against the rocks. When dissolving a rock in an acid, for example lemon or acetic acid, these acids react with the stone dissolving it, allowing the stone to break.

According to Charles's law, the volume of a given amount of gas is directly proportional to its temperature in Kelvin when the pressure is held constant. In this case, the final volume of the methane gas can be calculated using the formula V2 = V1 * (T2 / T1) where V1 is the initial volume, T1 is the initial temperature in Kelvin, T2 is the final temperature in Kelvin, and V2 is the final volume.

According to Charles's law, the volume of a given amount of gas is directly proportional to its temperature in Kelvin when the pressure is held constant. This means that as the temperature of the methane gas increases from 25°C to 88°C, its volume also increases. To find the final volume, you can use the formula:

V2 = V1 * (T2 / T1)

Where V1 is the initial volume (36.4 L), T1 is the initial temperature in Kelvin (25°C + 273.15), T2 is the final temperature in Kelvin (88°C + 273.15), and V2 is the final volume.

Plugging in the values:

V2 = 36.4 L * (361.15 K / 298.15 K)

Calculating, the final volume of the gas is approximately 43.88 L.

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Answer:

Nickel

Explanation:

The element which have the electronic configuration of [Ar]4s²3d⁸ is Nickel

This is the arrangement of electrons in the various energy levels of an atom.

The number of electrons to be filled in the energy levels is equal to the atomic number of the element

Atomic number of element = Ar + 2 + 8

Atomic number of element = 18 + 2 + 8

Atomic number of element = 28

From the periodic table, only Nickel has atomic number of 28.

Thus, we can conclude that the element having the electronic configuration of [Ar]4s²3d⁸ is Nickel

Learn more about electronic configuration:

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The given for the problem:

100 cm^3 butane

Get first the molecular formula of butane and it is C4H10

To solution for the problem is:

2 C4H10 + 13 O2 = 8 CO2 + 10 H2O
n = V/22.4

n (C4H10) = 0.1/22.4 = 0.0047 mol

n (CO2) = 4 · n (C4H10) = 4 · 0.0047 = 0.018 mol

Burning 100 cm³ of butane in excess oxygen at STP produces 0.4 liters of carbon dioxide, as calculated through the stoichiometry of the balanced combustion reaction of butane.

When butane (C₄H₁₀) is burned in excess oxygen, the combustion reaction can be represented by the balanced equation:

2 C₄H₁₀(g) + 13 O₂(g) → 8 CO₂(g) + 10 H₂O(g)

The balanced equation shows that 2 moles of butane produce 8 moles of carbon dioxide (CO₂). At standard temperature and pressure (STP), 1 mole of any gas occupies 22.4 L. Therefore, for every 2 moles (2 × 22.4 L) of butane, 8 moles (8 × 22.4 L) of CO₂ are produced. If we burn 100 cm³ (which is equivalent to 0.1 L) of butane, we need to determine how many moles this quantity represents and then calculate the corresponding volume of CO₂ produced.

First, we calculate the moles of butane:

0.1 L butane × (1 mole butane / 22.4 L) = 0.00446 moles butane

Using the stoichiometry of the reaction, the moles of CO₂ produced are 4 times the moles of butane:

0.00446 moles butane × (4 moles CO₂ / 1 mole butane) = 0.01784 moles CO₂

Now, we convert the moles of CO₂ to volume at STP:

0.01784 moles CO₂ × (22.4 L / 1 mole CO₂) = 0.4 L CO₂

Therefore, 100 cm³ of butane will produce 0.4 liters of carbon dioxide at STP when burned in excess oxygen.

Answer:

D) 4

Explanation:

23.7 g of Ca₃(PO₄)₎₂ contains 9.20 x 10^22 ions of PO₄³⁻  

23.7 g of Ca₃(PO₄)₎₂ contains 0.1528 moles of PO₄³⁻ which is equivalent to 9.20 x 10^22 ions of PO₄³⁻

Therefore;

Ca₃(PO₄)₎₂ ionizes to give out 3 Ca²⁺ ions and 2 PO₄³⁻ ions

Ca₃(PO₄)₎₂ → 3Ca²⁺ + 2PO₄³⁻

Required to determine the number of ions of PO₄³⁻ ions

Number of moles = Mass /Molar mass

Molar mass of Ca₃(PO₄)₎₂ = 310.1767 g/mol

Thus;

Moles = 23.7 g/310.1767 g/mol

          = 0.0764 moles

1 mole of  Ca₃(PO₄)₎₂ ionizes to give 2 moles PO₄³⁻ ions

Therefore;

0.0764 moles will produce;

 = 0.0764 moles x 2

 = 0.0152 moles PO₄³⁻ ions

1 mole of PO₄³⁻ ions contains 6.022 x 10^23 ions

Therefore;

0.01528 moles PO₄³⁻ ions contains;

= 0.01528 x 6.022 x 10^23 ions

= 9.20 x 10^22 ions

Keywords: Atoms, ions, Moles, molar mass

Level: High school

Subject: Chemistry

Topic: Moles

Sub-topic: Avogadro's constant

Explain how this was solved please

The substance that can be decomposed by chemical means is [tex]\boxed{{\text{c}}{\text{. methane}}}[/tex].

Further Explanation:

The pure form of matter is called substance whereas the combination of atoms and molecules is known as mixture.

Substance is further divided into two types:

1. Element

It is a type of pure substance and is the simplest form that cannot be broken down by any chemical means. Copper, iron, and cobalt are some of the examples of elements.

2. Compound

It is composed of two or more different elements that are held together by chemical bonds. These can be broken down into their respective constituents. Their properties are quite different from those of their constituent elements. NaCl, [tex]{\text{C}}{{\text{O}}_{\text{2}}}[/tex] and [tex]{{\text{H}}_{\text{2}}}{\text{O}}[/tex] are examples of compounds.

a. Cobalt is an element so it is the simplest form in which it can exist. Therefore it cannot be broken down or decomposed by chemical methods.

b. Krypton is an element so it is the simplest form in which it can exist. Therefore it cannot be broken down or decomposed by chemical methods.

c. Methane is formed from one carbon and four hydrogen atoms so it is a compound. Since compounds can be decomposed chemically, methane is also decomposed by chemical means.

d. Zirconium is an element so it is the simplest form in which it can exist. Therefore it cannot be broken down or decomposed by chemical methods.

Learn more:

1. Which sample is a pure substance? https://brainly.com/question/2227438

2. Which is a characteristic of a mixture? https://brainly.com/question/1917079

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Elements, compounds, and mixtures

Keywords: substance, methane, cobalt, zirconium, krypton, element, compound, chemical means, decomposed, broken down, simplest form.

Final answer:

To neutralize 0.220 g of NaOH with 0.130 M H2SO4, you would need approximately 21.2 mL of the sulfuric acid solution.

Explanation:

To determine how many milliliters of 0.130 M H2SO4 are needed to neutralize 0.220 g of NaOH, follow these steps:

Calculate the moles of NaOH by using its molar mass (Molar mass of NaOH = 40.00 g/mol):

0.220 g NaOH × (1 mol NaOH / 40.00 g NaOH) = 0.0055 mol NaOH

Write the balanced chemical equation for the neutralization reaction:

H2SO4 (aq) + 2NaOH(aq) → Na2SO4 (aq) + 2H2O(l)

Calculate the moles of H2SO4 needed using the stoichiometry of the reaction:

0.0055 mol NaOH × (1 mol H2SO4 / 2 mol NaOH) = 0.00275 mol H2SO4

Calculate the volume of H2SO4 needed by rearranging the molarity equation (Molarity = moles / volume in liters):

Volume of H2SO4 = 0.00275 mol H2SO4 ÷ 0.130 mol/L

Volume of H2SO4 = 0.0212 L

Convert the volume from liters to milliliters:

0.0212 L × 1000 mL/L = 21.2 mL

Therefore, approximately 21.2 mL of the 0.130 M H2SO4 solution is needed to neutralize the given amount of NaOH.

First let us consider the CO₂ formed in the reaction where the variables are:

>Pressure, P = (731.8/760) atm

>Volume, V = 37.6 mL = 0.0376 L

>Gas constant, R = 0.0821 atm L / (mol K)

>Temperature, T = (273.2 + 21.3) K = 294.5 K

From the ideal gas law : PV = nRT

Then, n = PV/(RT)

number of moles CO₂ formed, n = (731.8/760) × 0.0376 / (0.0821 × 294.5) mol = 0.001497 mol

The complete balanced chemical equation for the reaction is:

Na₂CO₃ + H₂SO₄ → Na₂SO₄ + H₂O + CO₂

We see that the mole ratio is Na₂CO₃ : CO₂ = 1 : 1

Hence, the number of moles of Na₂CO₃ which reacted

 => n = 0.001497 mol

Calculating for molar mass of Na₂CO₃

 => (23.0×2 + 12.0 + 16.0×2) g/mol = 106.0 g/mol

Therefore, mass of Na₂CO₃ reacted

=> (0.001497 mol) × (106.0 g/mol) = 0.159 g

So the percent purity of Na₂CO₃ in the sample is

=> (0.159/0.169) × 100% = 94.1%

Summary of answers:

a. 731.8 mm Hg; 0.963 atm

b. 0.001497 mol

c. 0.001497 mol

d. 0.159 g

e. 94.1%

The CO₂ gas's partial pressure is found using atmospheric pressure, with conversion to atm. Moles of CO₂ and Na₂CO₃ are calculated using the ideal gas law and stoichiometry. The percent purity of Na₂CO₃ is determined by comparing pure Na₂CO₃ mass to the original sample mass.

To determine the partial pressure of CO₂ gas produced, we use the ideal gas law, corrected for non-standard conditions and vapor pressure of water (which is negligible here). Given the atmospheric pressure, we take that as the total pressure, assuming CO₂ is the only gas collected. The conversion to atm from mm Hg is done using the conversion factor: 1 atm = 760 mm Hg.

To find the number of moles of CO₂, we will use the ideal gas equation (PV=nRT) with the provided volume, temperature, and pressure. For the temperature, we'll convert from Celsius to Kelvin by adding 273.15.

To determine the moles of Na₂CO₃, we use the stoichiometry of the reaction between sodium carbonate and sulfuric acid, knowing that it produces sodium sulfate, water, and CO₂. The molar mass of Na₂CO₃ is needed to find the mass of the pure sodium carbonate in the sample.

Finally, the percent purity of Na₂CO₃ in the original sample is calculated using the mass of pure Na₂CO₃ obtained and the original mass of the sample.

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The standard formation reaction of solid calcium hydroxide can be represented by the balanced chemical equation: CaO(s) + H2O(l) → Ca(OH)2(s).

The standard formation reaction of solid calcium hydroxide can be represented by the balanced chemical equation:

CaO(s) + H2O(l) → Ca(OH)2(s)

In this reaction, solid calcium oxide (CaO) reacts with liquid water (H2O) to produce solid calcium hydroxide (Ca(OH)2) as the only product.

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Solid calcium hydroxide is formed from the reaction of solid calcium oxide with liquid water, following the balanced chemical equation: CaO(s) + H₂O(l) → Ca(OH)₂ (s). The primary reactant, calcium oxide, can be readily obtained from the decomposition of calcium carbonate.

A balanced chemical equation for the standard formation reaction of solid calcium hydroxide can be derived from the reaction of solid calcium oxide with liquid water. The reaction can be represented as follows:

CaO(s) + H₂O(l) → Ca(OH)₂ (s)

 In this equation, solid Calcium Oxide (CaO) reacts with liquid water (H₂O) to form solid Calcium Hydroxide (Ca(OH)₂). Solid calcium oxides can be obtained from the decomposition of CaCO3 where the reaction is represented as CaCO3(s) → CaO(s)+CO2(g). By allowing the CO₂ to escape, we can achieve a 100% yield of CaO. This CaO then reacts with water to yield calcium hydroxide.

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Answer: D. A person pushing a couch without being able to move it.

Explanation:

The reason why is because static friction is where it prevents surfaces from sliding past each other, the static friction strength changes to match the applied force. If someone was to increase their force the static friction would still prevent the object from moving....

as in what the person above me said that goes towards sliding friction because if you were trying to push something with static friction if you have more than one person applying force then you would be able to move the object but with only having one the static friction would be greater then the applied force.

Answer:

Although the story of Beowulf is set in Scandinavia what language was it written in Old English.

Explanation:

Beowulf is a very old piece of literary genre. It is one of the earliest European epic written in vernacular language. It is an epic poem written in old English. The setting of the story has been set in Scandinavia. Beowulf is the hero of the poem. He is the protagonist of the story who survives the attacks of the monster named Grendel.

Answer:

OLD ENGLISH

Explanation:

what language "Beowulf" was written in originally. The first manuscript was written in the language of the Saxons, "Old English," also known as "Anglo-Saxon." Since then, the epic poem has been estimated to have been translated into 65 languages

By applying Hess's law, we can calculate the unknown standard enthalpy of formation for AgI(s) using the given standard enthalpy of reaction, and the standard enthalpies of formation for the other reactants and products.

In order to determine the value of ΔHf° for AgI(s), we need to use Hess's law which states that the total enthalpy change in a chemical reaction is independent of the pathway over which the reaction takes place. The formula is as follows: ΔHrxn = Σ ΔHf°(products) - Σ ΔHf°(reactants).

Given: ΔHrxn = -54.0 kJ, ΔHf° for AgBr(s) = -100.4 kJ/mol, and ΔHf° for Br2(g) = +30.9 kJ/mol. Making AgI(s) the subject of the formula, we find ΔHf° for AgI(s) =  Σ ΔHf°(products) - ΔHrxn, which upon substituting the values gives us the answer.

This method which employs Hess's law, enthalpy of formation, and the known quantities to provide the unknown standard enthalpy of formation for AgI(s) is representative of typical approaches in thermochemistry.

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The enthalpy of formation for AgI(s) is calculated using Hess's Law with the known enthalpies of formation for AgBr(s) and Br₂(g). Applying the enthalpy change for the reaction, the ΔH°f for AgI(s) is found to be -15.5 kJ/mol.

To determine the enthalpy of formation (ΔH°f") of AgI(s) for the reaction AgI(s) + Br₂(g) → AgBr(s) + I₂(s) using Hess's Law:

Answer:

Narcotics

Explanation:

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