Question 1

A 500 g piece of iron changes $7^oC$ when heat is added. How much heat energy was needed? ($C_p$ for iron is 0.46)

Accepted Answer

1,610 J

Answer

3.22 J

Answer

230 J

Answer

7,608 J

Question 2

1200 cal of heat energy is added to a liquid with a specific heat of $0.57 cal /g^oC$. If the temperature increases from $20^oC$ to $33^oC$, what is the mass of the liquid? Round to 3 sig figs.

Accepted Answer

162 g

Answer

54 g

Answer

100 g

Answer

297 g

Question 3

How much heat energy is required to raise the temperature of 10 grams of ice from $-10^oC$ to $0^oC$? ($C_P$ for ice is 0.5)

Accepted Answer

50 J

Answer

100 J

Answer

- 100 J

Answer

- 50 J

Question 4

When 300 cal of energy is lost from a 125 g object, the temperature decreases from $45^oC$ to $40^oC$. What is the specific heat capacity of this object?

Accepted Answer

$0.48 cal/g^oC$

Answer

$0.72 cal/g^oC$

Answer

$0.64 cal/g^oC$

Answer

$0.31 cal/g^oC$

Question 5

A 100 g sample of material requires 1220 calories of heat energy to raise its temperature from $20^oC$ to $80^oC$. What is the specific heat capacity of the material?

Accepted Answer

$0.203 cal/g^oC$

Answer

$0.105 cal/g^oC$

Answer

$0.394 cal/g^oC$

Answer

$0.299 cal/g^oC$

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