Q problems

Q = m x c x

Heat Mass Specific Heat Change in Temperature

Measured in Joules measured in grams measured in J/g Final temp.- Initial Temp.

Measured in

1. What is the heat lost by 6.25 grams of water that starts at 15.0 degrees C and goes to 3.0 degrees C? (specific heat of water is 4.184J/g)

2. What is the heat gained by 35 ml of liquid water that increases in temperature by 50.0 degrees C? (specific heat of water is 4.184J/g also, the density of water is 1.0g/ml)

3. What is the change in temperature that must have taken place if 10 grams of liquid water lost 376.2 Joules? (specific heat of water is 4.184J/g)

4. What is the final temperature of 5.5 grams of water that gains 125.4 Joules, if its initial temperature is 50. degrees C? There is no formula for final temperature, but you can find the change in temperature and then use that to find the final temperature. If this “gained” energy, do you think the final temp will be more or less than the initial?

5. What is the specific heat of a substance that gains 1672 Joules when its temperature goes from 50 to 95 , and it has a mass of 100 grams?

6. How much heat does a 6 gram piece of aluminum lose if it goes from 16 C to -32 C? Specific heat of aluminum = 0.89J/g

7. What must the initial temperature have been for a 80 gram block of copper that gains 167.2 Joules? Its final temperature was 123 C. The specific heat of copper is 0.39 J/g (find the change in temperature and use that to give you the initial temperature)

8. How much heat is required to raise the temperature of 5 grams of ice from -10C to 0C? The specific heat of ice is 2.09 J/gC.

9. What amount of heat is required to heat 5 grams of liquid water from 0C to 100C? (specific heat of water is 4.184J/g)

10. A 50.0 gram sample of a material requires 2758.8 J of heat to have its temperature raised from 20C to 80C. What is the specific heat of the material?

1. -313.8J -310J 2. 7322J 7300J 3. -8.99C -9C 4. 55.449C 55.4C 5. .37155J/gC .4J/gC 6. -256.32J, -300J 7. 117.64C 118C 8. 104.5J 100J 9. 2092J 2000J 10. .9196J/gC .9J/gC

Problems solving for Q

11. Water

Mass = 5 grams

Initial temp = 15 C

Final temp = 10 C

Specific Heat = 4.184 J/gC

Heat=?

12. Aluminum

Mass = 8 grams

Temp change = 4 C

Specific Heat = .9 J/gC

Heat = ?

13. Aluminum

Mass = 12 grams

Initial temp = -5 C

Final temp = 2 C

Substance = Aluminum Heat =?

14. Copper

Mass =2 grams

Temp change = 7 C

Substance = copper

Heat = ?

Finding specific heat

15.

Mass = 4 grams

Q = 9.75 Joules

Change in temp = 10 C

Specific heat = ?

16.

Mass = 20 grams

Q = 56 Joules

Change in temp = 20 C

Specific heat =?

Finding change in temp

17.

Mass = 6 grams

Q = 360 J

Substance = water

Change in Temp = ?

Finding Mass

18.

Q = 200 Joules

Substance = water

Change in temp = 10 C

Mass = ?