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uysha [10]
3 years ago
15

Melting water is an example of a physical change because (3 points)

Chemistry
1 answer:
ladessa [460]3 years ago
3 0
The water changes state.
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Iron filings can be separated from a mixture with sulfur by using a magnet.
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Limestone (CaCO3) is decomposed by heating to quicklime (CaO) and carbon dioxide. Calculate how many grams of quicklime can be p
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Answer: 2800 g

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CaCO_3(s)\rightarrow CaO(s)+CO_2(g)

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number 6.023\times 10^{23} of particles.

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

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\text{Number of moles}=\frac{5000g}{100g/mol}=50moles

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50 moles of CaCO_3 produces =\frac{1}{1}\times 50=50moles of CaO

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