How many moles are there in 2.4 x 10 24 atoms of He?



Group of answer choices

6.0 mol

2.4 x 10^24 mol

2.0 mol

4.0 mol

The iron filings react with copper sulfate, the copper is displaced and iron sulfate results.

The reaction between iron filings and copper sulfate is represented by the equation below:

\(Fe + CuSO_4--- > FeSO_4 + Cu\)

The iron filings displace the copper from copper sulfate to form iron sulfate.  Thus, elemental copper and iron sulfate are formed.

Iron is able to displace copper from copper sulfate because iron ranks higher than copper in the reactivity series.

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helium and neon ( answer C)

The reaction when silver metal is coated with red color after the reaction is known as displacement reaction.

The silver colored metal is coated with red color after reaction so the coating is a single element which is displaced by the silver colored reactant and the silver colored metal will form a compound because it displaces the red colored metal. So the products are a single metal and a compound and the reaction is displacement reaction.

Thus, the reaction describes a displacement reaction.

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C6H6 is the chemical formula for benzene. To get the molar mass of benzene, sum the atomic masses of all the atoms in the molecule. Carbon (C) has an atomic mass of 12.01 g/mol .

Aenzene has six carbon atoms. As a result, the total carbon mass in benzene is 6 x 12.01 = 72.06 g/mol. The atomic mass of hydrogen (H) is 1.01 g/mol, and benzene contains six hydrogen atoms. As a result, the total hydrogen mass in benzene is 6 x 1.01 = 6.06 g/mol. To determine the total molar mass of benzene, add the carbon and hydrogen masses: Benzene molar mass = 72.06 g/mol + 6.06 g/mol = 78.12 g/mol As a result, the molar mass of  benzene is 78.12 g/mol. C6H6 is the chemical formula for benzene. To get the molar mass of benzene, sum the atomic masses of all the atoms in the molecule. Carbon (C) has an atomic mass of 12.01 g/mol .

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As the volume is decreased and the pressure is increased to the given value, the temperature of the gas increases to 81.67°C.

Given the data in the question;

Combined gas law brings together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

\(\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\)

We substitute our given values into the expression above to determine the new temperature.

\(\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\\\\P_1V_1T_2 = P_2V_2T_1\\\\T_2 = \frac{P_2V_2T_1}{P_1V_1}\\T_2 = \frac{1.0atm\ *\ 0.4L\ *\ 350.15K}{0.789474atm\ *\ 0.5L} \\\\T_2 = \frac{140.06LatmK}{0.394737Latm}\\ \\T_2 = 354.82K\\\\T_2 = 81.67^oC\)

Therefore, as the volume is decreased and the pressure is increased to the given value, the temperature of the gas increases to 81.67°C.

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Water - H2O; Ammonia - NH3; Hydrogen sulfide - H2S; Ethanol - C2H6O are examples of polar covalent bonds.

What is a polar covalent bond?

A polar covalent bond is a bond created by exchanging electrons between two atoms with different electronegativities.

A molecule that depends on polar covalent bonding is the water molecule, which consists of two hydrogen atoms and one oxygen. Due to the different electronegativity values of each element, the electrons are not uniformly distributed, with the oxygen atom spending more time with them than the hydrogen atoms. Because the chloride ion is more electronegative than the hydrogen ion, HCl is a polar covalent molecule. Therefore, hydrogen has a partial positive character, whereas the chloride ion has a partial negative character. Given that the hydrogen and chlorine atoms share electrons, HCl exhibits covalent behavior.

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Answer:

xiu I nnn ivy u

Explanation:

shin deer high ed residency by uh uh to

Answer:

\({ \tt{1 \: km = 1000m}} \\ { \tt{1.5 \times {10}^{8} km = (\frac{1.5 \times {10}^{8} \times 1000 }{1} )m}} \\ = 1.5 \times {10}^{11} \: metres\)

Answer:

I believe the answer is A

Explanation:

Work and energy are related because when you work, you cause displacement in the object you are exerting upon. While this happens, you transfer energy between the systems. Both work and energy share the same SI unit, called the joule.

The balanced chemical reaction is Al + 3AgNO3 → Al (NO3)3 + 3Ag.

A balanced chemical equation though has the identical number of atoms from every type inside the reaction on both the reactant chemical equation output sides. In a balanced chemical equation, both the mass and the change were equal.

An organic organization may adjust to changes in its surroundings very easily. It is distinguished by low complexity, low centralization, as well as low formalization. A mechanistic organization, on the other hand, is distinguished by great complexity, high centralization, as well as high formalization.

Thus, the balanced chemical reaction will be Al + 3AgNO3 → Al (NO3)3 + 3Ag.

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Answer:

Chemical change :has change in mass, heat is needed, new element is formed, hard to reverse.......

Physicalchange:does not have change in mass, heat is not necessary, no new element is formed, easy to reverse

The compound that has the atom with the highest oxidation number is Al(NO2)3. Oxidation number refers to the apparent charge of an atom if its shared electrons were assigned to the atom with the higher electronegativity.

It’s not the same as the formal charge, which is the genuine charge of the atom. Al(NO2)3, which has the atom with the highest oxidation number, can be explained as follows:Al(NO2)3 (Aluminum nitrite)Al: +3No2: -1

The charge on the NO2 group is -1. The charge on aluminum in the aluminum nitrite compound is +3. As a result, the Al atom in Al(NO2)3 has the highest oxidation number. The substance that has the atom with the highest oxidation number is Al(NO2)3.

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The stepwise mechanism for the isomerization of 2,3-dimethylbut-1-ene to 2,3-dimethylbut-2-ene using strong acid (such as H2SO4) is as follows:

Step 1: Protonation of the double bond The first step involves the protonation of the double bond in 2,3-dimethylbut-1-ene by the strong acid, H2SO4. This creates a carbocation intermediate on the more substituted carbon atom (the one with more alkyl groups attached).

Step 2: Migration of the alkyl group In the second step, one of the alkyl groups attached to the carbocation intermediate migrates to the adjacent carbon atom (the one with the less substituted carbon atom). This step occurs via a hydride shift mechanism, where a hydrogen atom is transferred from the adjacent carbon atom to the carbocation.

Step 3: Deprotonation Finally, the last step involves deprotonation of the intermediate to form the more stable 2,3-dimethylbut-2-ene product. This is done by the conjugate base of the strong acid (in this case, HSO4-). Overall, the isomerization process involves the conversion of a less stable alkene (2,3-dimethylbut-1-ene) to a more stable alkene (2,3-dimethylbut-2-ene) via the rearrangement of the carbocation intermediate.

Protonation is the addition of a proton to an atom, molecule, or ion, producing a conjugate acid. Examples include: Protonation of water by sulfuric acid: H₂SO₄ + H₂O H₃O⁺ + HSO−4 Protonation of isobutene in the formation of carbocations: (CH₃)₂C=CH₂ + HBF₄ (CH₃)₃C⁺ + BF−4

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Answer:

yes so for example one

Explanation:

yeah so

Yes, it is possible to make an aqueous solution of strontium hydroxide that gives a pOH of 10.54 because of thr Sr ions in the solution.

First, we can use the relationship between pH and pOH,

pH + pOH = 14

Since we want a pOH of 10.54, we can solve for the pH,

pH = 14 - pOH

pH = 14 - 10.54

pH = 3.46

Next, we can use the ionization constant expression for strontium hydroxide,

Sr(OH)₂(s) → Sr²⁺(aq) + 2OH⁻(aq)

Kw = [H⁺][OH⁻] = 1.0 x 10⁻¹⁴

Hence, the concentration will be given as,

[OH⁻] = 2[Sr²⁺]

Substituting this expression into the Kw expression, we get,

Kw = [H⁺][OH⁻] = [H⁺] (2[Sr²⁺])

1.0 x 10⁻¹⁴ = [H⁺] (2x)

where x is the molar concentration of strontium ions.

Solving for x, we get,

x = 1.0 x 10⁻¹⁴ / 2

x = 5.0 x 10⁻¹⁵

Therefore, the molar concentration of strontium ions in solution is 5.0 x 10⁻¹⁵ M.

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Answer:

reaction to cold pack: change in temperature

Evidence of a chemical reaction etc is change in composition

Explanation: composition is atoms changeing and etc, which is a chemical reacton i think. Change in temperture is alsoa  chemical reaction but cold packs

Answer:

Cold pack: absorbs heat (endothermic reaction)

Hot pack: releases heat ( exothermic reaction)

Explanation:

when a cold pack/hot pack is shaken, water mixes with the chemicals in the outer layer and reacts to release or absorb heat.

Answer:

The periodic table

Explanation:

I'm not really sure what your question is. . . I'm assuming this is what you're looking for

When 2.60 moles of pentane react with excess oxygen, 13.0 moles of carbon dioxide will form.

The balanced equation for the combustion of pentane (C₅H₁₂) with oxygen (O₂) to form carbon dioxide (CO₂) and water (H₂O) is:

C₅H₁₂ + 8O₂ → 5CO₂ + 6H₂O

From the balanced equation, we can see that for every 1 mole of pentane, 5 moles of carbon dioxide are produced. Therefore, if 2.60 moles of pentane react, we can calculate the moles of carbon dioxide formed using the mole ratio:

2.60 moles C₅H₁₂ x (5 moles CO₂ / 1 mole C₅H₁₂) = 13.0 moles CO₂

Therefore, when 2.60 moles of pentane react with excess oxygen, 13.0 moles of carbon dioxide will form.

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Tropism is the movement that plants make in response to a stimulus from the outside, hydrotropism and gravitropism work together in the roots adaptation.

Hydrotropism is the response of the plant to an aquatic stimulus, it is usually reflected in the growth of the roots oriented by the availability of water.

On the other hand, the growth towards the ground of the roots is determined by another tropism: gravitropism, a response to the force of gravity, together with hydrotropism, plants take advantage of water throughout their development and adaptation.

Therefore, we can conclude that depending on the nature of the stimulus, tropisms are classified in different ways, hydrotropism and gravitropism work together in the plant's adaptation.

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Answer:

its A btw

Explanation:

Answer:

Simple molecules contain only a few atoms held together by covalent bonds .

To calculate the specific heat of silver, you will need to use the formula:

So for this example, we can calculate the specific heat of silver as follows:

Therefore, the specific heat of silver is 0.523 J/g°C.

The specific heat of silver is a measure of the amount of energy required to increase the temperature of one gram of silver by one degree Celsius. This value is important in understanding how different materials respond to temperature changes and can be used in many areas of science and engineering.

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Solubility is the ability of a substance to dissolve in a liquid to form a solution. It is an important physical property of substances that must be taken into account.

Substance is a term used to refer to a material that has mass and occupies space. It is something that has physical properties that can be identified and measured. Substance can be either a solid, liquid, gas, or plasma. Examples of substances include solids such as iron, liquids like water, gases like oxygen, and plasma like fire.

Solubility is the ability of a substance to dissolve in a liquid to form a solution. It is an important physical property of substances that must be taken into account when studying topics such as solute-solvent interactions, chemical reactions, and phase changes. In this lab, we will be exploring the solubility of various substances, including sugar, salt, and baking soda, to determine how their solubility is affected by changes in temperature. To begin, we will measure out one gram of each substance into separate test tubes and dissolve them in 10mL of water. We will then place each test tube into a beaker of hot (90°C) and cold (0°C) water and observe the differences in solubility. We will use a thermometer to measure the temperatures of each beaker and record the results. Next, we will measure out two grams of each substance and repeat the same procedure as before. We will then measure out five grams of each substance and repeat the experiments. We will record our observations and results for each experiment.

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Answer:

Explanation:

Understand that a substance's specific heat (C) is a property that can be used to ... Calculate the heat required to melt 25.7 g of solid methanol at its melting point. ... How many moles of NH4NO3 must be dissolved in water so that 88.0 kJ of heat ... to vaporize 54.0 g of ethanol (C2H5OH) if AHvap for ethanol = 43.5. kJ/mol?

Hydrophobic colloids option b- can be stabilized by adsorption of ions.

Hydrophobic colloids are colloidal particles that repel water molecules and tend to aggregate or coagulate in aqueous solutions. To stabilize hydrophobic colloids, surfactants or stabilizing agents are added to the system.

These surfactants have hydrophobic and hydrophilic regions that can adsorb onto the surface of the colloidal particles, forming a protective layer that prevents their aggregation. This adsorption of surfactant molecules on the particle surface is commonly referred to as "stabilization by adsorption of ions".

The surfactant molecules adsorb onto the particle surface with their hydrophobic tails pointing inward towards the particle surface and their hydrophilic heads pointing outward towards the solvent, creating a stable colloidal dispersion. This stabilization mechanism is commonly used in the formulation of emulsions, suspensions, and other colloidal systems.

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Answer:

hrjfnd

Explanation:

hfhdhfujduejdjdjdbfudbdjdbdifhdudjdufb

Therefore, all you have to do is subtract 14 from the negative base-10 logarithm of the concentration of H+.

Simply deduct the pH from 14 to obtain the pOH. Take the negative log of the hydroxide ion concentration to determine the pOH. Simply subtract pOH from 14 to determine the pH.

The acidity of the solution increases with the amount of [H+] ions present. The more [OH-] ions there are in the solution, the more basic it is. Water has a unique characteristic that, depending on what is dissolved, causes it to behave as either an acid or a base.

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for earth quake write, a disturbance in a suburban city has cause a massive earth quake and many problems for the citizens living there, add what you want after that

hope this helps :D

Answer:

wow

Explanation:

dang

6.99 grams of iron (Fe) would produce 10 g of rust (Fe2O3) when iron combines with oxygen to form rust.

The mass of a substance can be calculated as follows:

According to this question, iron combines with oxygen to form rust as follows:

4Fe + 3O2 → 2Fe2O3

First, we convert the mass of rust to moles as follows:

moles of Fe2O3 = 10g/159.69 = 0.063moles

Next, convert moles of Fe to mass as follows:

mass of Fe = 0.125 × 55.85 = 6.99g

Therefore, 6.99 grams of iron (Fe) would produce 10 g of rust (Fe2O3) when iron combines with oxygen to form rust.

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