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AnnyKZ [126]
3 years ago
8

which of these is a chemical change? A. melting ice B. making powdered juice C. cutting paper D. sodium hydroxide

Chemistry
1 answer:
sineoko [7]3 years ago
4 0
The answer is D. sodium hydroxide
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Answer and Explanation:

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a sample of helium occupies a volume of 101.2 mL at a pressure of 790 mmHg. at what pressure would the volume be 120 mL?
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Answer : The final pressure will be, 666.2 mmHg

Explanation :

Boyle's Law : It is defined as the pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles.

P\propto \frac{1}{V}

or,

P_1V_1=P_2V_2

where,

P_1 = initial pressure = 790 mmHg

P_2 = final pressure = ?

V_1 = initial volume = 101.2 mL

V_2 = final volume = 120 mL

Now put all the given values in the above equation, we get:

790mmHg\times 101.2mL=P_2\times 120mL

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6 0
2 years ago
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Amount of Fe on product side: 9

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