If the sample gains mass as a result of heating it in air, it indicates that a c

Question

If the sample gains mass as a result of heating it in air, it indicates that a chemical reaction between the sample and a gas present in the air has taken place.

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Question 23 pts

Spilling some of the sample from the porcelain dish after you have started heating it will give a final mass for the product that is too low.

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Question 33 pts

All of the oxygen contained in the CuO product comes from the sample you start with.

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Question 43 pts

All of the copper contained in the CuO product comes from the sample you start with.

Explanation / Answer

2Cu+O2 -------> 2CuO

Assuming the above reaction,

1. True.. mass of the product increases because of reaction with oxygen in the air.

2. True.. since as the reactant spills then product yield decreases.

3. False.. all oxygen comes from air only.

4. True.. all Cu comes from reactant only.

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