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LekaFEV [45]
3 years ago
14

Label each of the following changes as a physical change or chemical change. Give evidence to support your answer.

Chemistry
1 answer:
SVEN [57.7K]3 years ago
3 0

Answer:

A catalytic converter changes nitrogen dioxide to nitrogen gas and oxygen gas is a chemical change.

Explanation:

Hello.

In this case, since physical changes do not modify the molecular composition and structure of the material undergoing it whereas the chemical change does, for catalytic converters we should know they promote chemical reaction in which the composition is changed; for instance, for the given example, the following chemical reaction is the evidence:

2NO_2\rightarrow N_2+O_2

As you can see, nitrogen and oxygen are no longer bonded but separated by themselves, therefore, this is a chemical change.

Best regards.

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Substances that are likely to dissociate it water
Neporo4naja [7]

Answer:

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Explanation:

7 0
3 years ago
I performed an experiment and mixed copper nitrate and potassium iodide. When they reacted, they formed a precipitate, even thou
Alexus [3.1K]

Answer:

2Cu2^+ + 2I^- ----> 2Cu^+ + I2

Explanation:

The reaction performed in the experiment is;

2 Cu(NO3)2 + 4 KI → 2 CuI (s) + 4 KNO3 + I2

The iodide ions reduces Cu^2+ to Cu^+ which is insoluble in water hence the precipitate. This is so because iodine is a good oxidizing agent seeing that it requires one electron to fill its outermost shell. Potassium on the other hand is a good reducing agent since it easily looses its one electron.

The oxidation - reduction equation is as follows;

2Cu2^+ + 2e ----> 2Cu^+ reduction half equation

2I^- ----> I2 + 2e. Oxidation half equation

Balanced redox reaction equation;

2Cu2^+ + 2I^- ----> 2Cu^+ + I2

3 0
3 years ago
Becomes caramel. He pushes
kozerog [31]

Answer:

Turning Sugar into Caramel

Explanation:

You turn sugar into caramel by burning sugar. Burning sugar is a chemical change.

5 0
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VMariaS [17]

Answer:

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Explanation:

4 0
3 years ago
Somebody help please I'm really confused about the whole question.
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A 10.0g
ok hope this helps
5 0
3 years ago
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