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LekaFEV [45]
2 years ago
14

Pure Gold (24 Kt) is a soft metal, so jewelers often add other metals (silver or copper) to make gold rings harder (and less exp

ensive). When the metals are combined a chemical reaction does not occur. Are these rings mixtures or compounds? Explain your answer
Chemistry
1 answer:
hoa [83]2 years ago
8 0
I believe it is a compound, seeing as compounds are basically different types of elements, only combined into one single compound. Please tell me if i'm wrong?
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4. A student started with a 0.032 g sample of copper which he took through the series of reactions described in this experiment.
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.

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3 years ago
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Explanation:

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6 0
2 years ago
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malfutka [58]

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5 0
3 years ago
Find out the reasons why hydrogen is not used as a fuel although it has very high calorific value.
AnnyKZ [126]

Answer:

Although hydrogen has the highest calorific value, it is not used as a domestic fuel. It is because hydrogen is a highly combustible and it reacts explosively when it comes in contact with air. And hence as a result, storing of the hydrogen gas is difficult and is dangerous at the same time.

3 0
3 years ago
what is the total amount of energy absorbed by the substance as it completely changes from a solid at 40 degrees to a gas at 200
astra-53 [7]

Answer:

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6 0
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