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2 years ago

Which of the following are indicators of a chemical change? Select all that apply.

2 answers:

4 0

Which of the following are indicators of a chemical change? Select all that apply.

These are the answers:

color change
temperature change
precipitate formation
gas formation

Hope this helps.

Lorico [155]2 years ago

4 0

The awnser is A and B beacause chemical changes are what is on a molecular level while the other choices are physical changes.

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Explain Charles law

kodGreya [7K]

"Charles Law" is the relationship between "volume-temperature" (V ∝ T).

Explanation:

Charles Law is basically volume-temperature relationship (V ∝ T). French scientist “Jacques Charles” in 1787 studied effect of temperature on the volume of gases at constant pressure, which described how gases manage to expand when heated. Law stated as “At constant pressure, the volume of a given "mass" of a gas decreases or increases by 1/273 of its volume at $0^{\circ} \mathrm{C}$ for each one degree rise or fall in temperature”. Formula derived from law is as follows: $\mathbf{V}_{\mathbf{t}}=\mathbf{V}_{0}[\mathbf{1}+\mathbf{t} / \mathbf{2} 7 \mathbf{3}]$ here ${V}_{0}$ is volume of given mass of a gas at $0^{\circ} \mathrm{C}$ , ${V}_{t}$ is its volume at any temperature $t^{\circ} \mathrm{C}$ . Application of Charles law is hot air balloons.

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2 years ago

Use the drop-down menus to rank the boiling points of the following hydrocarbons. Use a "1" to indicate

sertanlavr [38]

Answer:

1. 4

2. 2

3. 3

4. 1

Explanation: just did it on edge 2021

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2 years ago

Explain the different melting points between ionic and covalent bonding

yarga [219]

Ionic bonding is formed in Ionic compounds due to electrostatic force between the oppositely charged ions.

In covalent bonds electrons are shared between the atoms. In case of ionic bond the bond is stronger as there is complete transfer of electrons from one ion to the other.

Since the ionic bonds are more difficult to break than the covalent bonds, ionic compounds have a higher melting point than covalent compounds.

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2 years ago

Read 2 more answers

What general term is used to describe the pure liquid (such as a pure water) obtained in such a process

yulyashka [42]

Pure water is called distilled water or deionized water.

8 0

2 years ago

Which of the following best accounts for the difference in mutagenic activity between PAHs and PAHs plus liver preparation?

guapka [62]

Answer: C

Explanation:

Some poly nuclear aromatic hydrocarbons are not carcinogenic in themselves. However, when these are made to interact with living cells, enzymes in the cells could convert the polynuclear aromatic hydrocarbon into a carcinogenic material such as benzo-[a]-pyrene. This can now interact adversely with the deoxyribonucleic acid of living cells leading to genetic mutation, that is, irreversible changes in the genes of organisms.

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2 years ago