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alexandr1967 [171]
3 years ago
15

Which of the following is an example of a chemical change?

Chemistry
1 answer:
elena-s [515]3 years ago
6 0
The best answer is the first option. A bike rusting is an example of a chemical change since rusting is a chemical reaction. New substances are formed from this reaction. On the other hand, other choices given are just physical changes because only the shape or the physical form of the substances are being changed.
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45.0 L is the volume of gas will the balloon contain at 1.35 atm and 253 K.

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Using Ideal gas equation for same mole of gas as

\frac {{P_1}\times {V_1}}{T_1}=\frac {{P_2}\times {V_2}}{T_2}

Given ,  

V₁ = 25.0 L

V₂ = ?

P₁ = 2575 mm Hg

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P₁ = 2575 / 760 atm = 3.39 atm

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Using above equation as:

\frac {{P_1}\times {V_1}}{T_1}=\frac {{P_2}\times {V_2}}{T_2}

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\frac{1.35V_2}{253}=\frac{3.39\times \:25}{353}

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