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eduard
3 years ago
11

In each case, decide if the change is a "chemical change" or a "physical change". a) A cup of household bleach changes the color

of your favorite T-shirt from purple to pink. b) Water vapor in your exhaled breath condenses in the air on a cold day. c) Plants use carbon dioxide from the air to make sugar. d) Butter melts when placed in the Sun
Chemistry
1 answer:
Crazy boy [7]3 years ago
8 0

Answer:A cup of household bleach changes the color of your favorite T-shirt from purple to pink. - chemical change

Water vapor in your exhaled breath condenses in the air on a cold day.- physical change

Plants use carbon dioxide from the air to make sugar.- chemical change

Butter melts when placed in the Sun- physical change

Explanation:

A chemical change leads to the formation of a new substance and is not easily reversible. A physical change does not lead to the formation of a new substance and is easily reversible. Physical changes include condensation, melting,etc while a chemical change is a chemical reaction.

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4.41 g of propane gas (C3H8) is injected into a bomb calorimeter and ignited with excess oxygen, according to the reaction below
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Answer :  The heat of the reaction is -221.6 kJ

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Heat released by the reaction = Heat absorbed by the calorimeter

q_{rxn}=-q_{cal}

q_{cal}=c_{cal}\times \Delta T

where,

q_{rxn} = heat released by the reaction = ?

q_{cal} = heat absorbed by the calorimeter

c_{cal} = specific heat of calorimeter = 97.1kJ/^oC=97100J/^oC

\Delta T = change in temperature = (T_{final}-T_{initial})=(27.282-25.000)=2.282^oC

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

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