4 years ago

Why is mercury the only metal to have been used in thermometers

1 answer:

6 0

I think because its the only one to be liquid at normal temperatures.

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Bumek [7]

Answer:

C more collision between molecules

Explanation:

increase in heat causes increase in kinetic energy of the particles

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2 years ago

Tcecarenko [31]

I believe the answer Is B

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stellarik [79]

A straight line on a distance va time graph represents constant speed

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Tju [1.3M]

Answer:

It is based on testable and replicable evidence.

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3 years ago

Elodia [21]

Answer:

$Y=48.6\%$

Explanation:

Hello,

In this case, we can consider the following chemical reaction for the oxidation of copper which only occurs at high temperatures:

$2Cu+O_2\rightarrow 2CuO$

In such a way, for 0.032 grams of copper, the following grams of copper (II) oxide (black product) are yielded:

$m_{CuO}=0.032gCu*\frac{1molCu}{63.546gCu} *\frac{2molCuO}{2molCu}*\frac{79.546gCuO}{1molCuO} =0.078gCuO$

Therefore, the percent yield is:

$Y=\frac{0.038g}{0.078g}*100\%\\ \\Y=48.6\%$

Best regards.

6 0

3 years ago