2 years ago

What direction does the energy flow in an exothermic reaction? *

2 answers:

7 0

<h3>Answer: In an exothermic reaction, heat flows from the system into the surroundings, increasing the temperature of the surroundings.</h3>

WARRIOR [948]2 years ago

4 0

Answer: Heat flows from the system into the surroundings by increasing the temperature rate of the surrounding.

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How much heat is needed to change the temperature of a 30.0 gram sample of copper from 20.0c to 60.0c?

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Answer: 462.00 Joules of heat will be needed to change the temperature of copper from 20° C to 60° C.

Explanation:

Mass of copper,m = 30.0 grams

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$T_1=20^oC,T_2=60^oC$

$\Delta T=T_2-T_1=60^oC-20^oC=40^oC$

$Q=mc\Delta T$

$Q=30.0 grams\times 0.385 J/g ^oC\times 40^oC=462.00 J$

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