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Feliz [49]
3 years ago
15

Please help with these three questions.

Chemistry
1 answer:
scoundrel [369]3 years ago
3 0
B. 0.9 <span>
</span>D.Light intensity has no effect on whether electrons are emitted or not. 
and
A. X=1.9eV,Y=0.2eV 

I already took the gizmo so I know these are right. The first one I got wrong b/c there was no graph and the last one I didn't understand. Basically for the last one you calculate the work function for the metals and find their difference.

Hope this helps.
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What is the maximum number of electrons in oxygen Adam can hold in its outer energy level
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Do you mean atom :).
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A group of students performed an experiment to prove the law of conservation of energy. In the experiment, a flask containing wa
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4 years ago
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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.

6 0
4 years ago
What are the pros and cons for natural gasses
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Hope that helps! *if you need more let me know*
6 0
3 years ago
Read 2 more answers
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