CHEMISTRY HIGH SCHOOL

Chemical changes ________ involve the breaking and making of chemical bonds.A) Always
B) Never
C) Sometimes

Fill in the blank

Answers

Answer 1
Answer: The correct answer that would best complete the given statement above would be option A. Chemical changes ALWAYS involve the breaking and making of chemical bonds. When there is chemical change, a new compound is being formed. If a new compound is not formed, then it is not considered as a chemical change. When a new compound is formed, therefore, there is the breaking and making of chemical bonds. Hope this helps.
Answer 2
Answer:

Answer:

A:  Always.

Explanation:

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Tectonic plates make up which of the following layers of the Earth?

Answers

The lithosphere makes up the layer of the earth.

How do three states of matter arise?

Answers

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Carbon dioxide is a green house gas that is linked to global warming. It is released into the atmosphere through the combustion of octane (C8H18) in gasoline. Write the balanced chemical equation for the combustion of octane. (Use the lowest possible whole number coefficients. Omit states-of-matter from your answer.)Calculate the mass of octane needed to release 3.50 mol CO2.

Answers

Final answer:

The balanced chemical equation for the combustion of octane is 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O. From the stoichiometry of the reaction, 3.50 mol of CO2 will need approximately 50g of octane.

Explanation:

The combustion of octane (C8H18) in the presence of oxygen (O2) produces carbon dioxide (CO2) and water (H2O). The balanced chemical equation for this reaction is: 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O.

To calculate the mass of octane needed to release 3.50 mol CO2, we need to understand the stoichiometry of the reaction. From the balanced equation, we can see that 16 mol of CO2 is produced from 2 mol of C8H18. So, 1 mol of C8H18 produces 8 mol of CO2.

Therefore, to produce 3.50 mol of CO2, we would need 3.50/8 = 0.4375 mol of C8H18. The molar mass of octane is approximately 114 g/mol, so the required mass would be 0.4375mol x 114g/mol = approximately 50g.

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Final answer:

The combustion of octane produces carbon dioxide and water, as described by the balanced chemical equation C8H18 + 12.5O2 → 8CO2 + 9H2O. To produce 3.50 mol of CO2, approximately 50g of octane is needed.

Explanation:

The combustion of octane (C8H18) in the presence of oxygen (O2) produces carbon dioxide (CO2) and water (H2O). The balanced chemical equation for this reaction is: C8H18 + 12.5O2 → 8CO2 + 9H2O.

Considering the stoichiometry of the reaction, we can see that 1 mol of octane produces 8 moles of CO2. Therefore, to produce 3.50 mol of CO2, the amount of octane required would be 3.50/8 = 0.4375 mol. Converting this to mass using the molar mass of octane (114.22 g/mol), we get 0.4375 mol * 114.22 g/mol ≈ 50 g. Thus, approximately 50g of octane is needed to produce 3.50 mol of CO2.

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Hydrocarbons are organic compounds which contain: H H and C only H and C C and H2O

Answers

The answer would be H and C only. Hydrocarbons are organic compounds consisting entirely of carbon and hydrogen. They are the simplest form of organic compounds. They are joined together by covalent bonds. They can be straight-chain, cyclic or branched chain.

Hydrocarbons are organic compounds which contain hydrogen, H and carbon, Conly (option B)

What is hydrocarbon?

Hydrocarbons special class of organic compounds that contains only carbon (C) and hydrogen (H).

Hydrocarbons are classified into:

  1. Saturated hydrocarbons i.e having only single bonds in its chain
  2. Unsaturated hydrocarbons i.e having double or triple bond

Generally, hydrocarbons are group into different homologous series. Some of which includes:

  • Alkanes i.e single bond
  • Alkenes i.e double bond
  • Alkynes i.e tripple bond

All of the above have only carbon and hydrogen in their structural formula.

Thus, with the above information, we can conclude that hydrocarbons contains H and C only (option B)

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Complete question:

Hydrocarbons are organic compounds which contain

a. H-H

b. H and C only

c. H, C and H₂O

Which term identifies a type of nuclear reaction?A) transmutation
B) neutralization
C) deposition
D) reduction

Answers

A nuclear reaction is B) Neutralizer. 

One hundred students were surveyed about who they would vote for. What isthe best way to display the results? Explain your answer.

Answers

Hey hope this helps ⬇️
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