Question

#1: Which of the following is the abbreviation for a unit of energy?

A. K

B. °C

C. W

D. cal

**my answer: D. cal

is that right? @aaronq :)

Answer 1

#2: A 200 g block of a substance requires 1.84 kJ of heat to raise its temperature from 25°C to 45°C. Use the table attached to identify the substance.

A. iron

B. aluminum

C. gold

D. copper

**my answer: A. iron

is that right?

Answer 2

#3: In a calorimeter, the temperature of 100 g of water decreased by 10°C when 10 g of ice melted. How much heat was absorbed by the ice?

*****USE THE SAME TABLE AS #2!!!! ***** :)
A. 418 kJ

B. 100 kJ

C. 10 J

D. 4.18 kJ

**my answer: A

is that right? I'm not too sure :/

Answer 3

#4: The amount of heat needed to raise the temperature of 50 g of a substance by 15°C is 1.83 kJ. What is the specific heat of the substance?

A. 2.44 J/g-°C

B. 2.22 J/g-°C

C. 2.13 J/g-°C

D. 2.05 J/g-°C

**my answer; A

is that right? again, I'm not 100% sure :p

Answer 4

#5: In a calorimeter, 3.34 kJ of heat was absorbed when 10 g of ice melted. What is the enthalpy of fusion of the ice?

A. 6.68 J/g

B. 334 J/g

C. 6.68 kJ/g

D. 334 kJ/g

***my answer: D. 334 kJ/g

is this one right? :)

Answer 5

1-4 are good

but 5... there are 10 grams .. and the answers are given in terms of per gram..

Answer 6

watch the units

Answer 7

okay! awesome! :)

and ohh i see.. so should #5 be B? 334 J/g
?? :)

Answer 8

yep! :)

Answer 9

awesome!! :) haha thank youu :)

Answer 10

no problem!