3 years ago

Explain why crushing a can is physical change and not chemical

1 answer:

6 0

It's not a chemical change because the crushing of a can does not mean the can transform from one substance to another. The can is crushable is a characteristic that can be described to identify a substance. Also, the chemical composition of the can does not change when you crush it, That's why it's not a chemical change.

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Question 22

ruslelena [56]

Answer:

O2, oxygen.

Explanation:

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In this case, for the undergoing chemical reaction, we need to compute the moles of CO2 yielded by 85 g of CH4 (molar mass = 16 g/mol) and by 320 g of O2 (molar mass 32 g/mol) via the following mole-mass relationships:

$n_{CO_2}^{by\ CH_4}=85gCH_4*\frac{1molCH_4}{16gCH_4} *\frac{1molCO_2}{1molCH_4} =5.3molCO_2\\\\n_{CO_2}^{by\ O_2}=320gO_2*\frac{1molO_2}{32gO_2} *\frac{1molCO_2}{2molO_2} =5molCO_2$

Considering the 1:2:1 among CH4, O2 and CO2. Therefore, since 320 g of O2 yield the smallest amount of CO2 we infer that the limiting reactant is O2.

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4. How many weeks are equal to 2.94 x 10 to the power of 6 minutes?

OverLord2011 [107]

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