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nadya68 [22]
3 years ago
9

Alan wants to identify an unknown solid compound. Which statement correctly describes a method he could use to identify the comp

ound?
A: he could find the temperature at which the compound melts because pure substances have definite melting points

B: he could find the mass of the sample because pure substances have definite masses

C: he could use a mesh screen to filter out the different elements that make up the compound

D: he could melt the compound because melting allows the elements of a compound to seperate
Chemistry
1 answer:
vfiekz [6]3 years ago
8 0

A: he could find the temperature at which the compound melts because pure substances have definite melting points

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Hydrogen gas is collected over water in an inverted buret. If the atmospheric pressure is 745 mm Hg, the vapor pressure of water
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P_{H_2}=727mmHg

Explanation:

Hello there!

In this case, according to the given data, it is possible to infer that the gas mixture lies on the 15.0 cm-high column of water, so that the total pressure or atmospheric pressure is given by:

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Thus, since the atmospheric pressure is 745 mmHg and the vapor pressure of water is 18 mmHg, the pressure of hydrogen turns out to be:

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26. Balance the following equations:<br> Ca(s) + H3PO4(aq)Ca3(PO4)2(s) + H2(g)
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Our final balanced equation:

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