Heat and heat capacity. 3r ESO - Physics and chemistry -IES Cap de Llevant - Maó - Menorca

1. SAME VOLUMES OF WATER AND OIL ARE
HEATED WITH SAME “BURNERS”
WE RECORD THE TEMPERATURE OF THE
SUBSTANCE EACH 30 SECONDS
DRAWING ON A SAME GRAPH HOW
TEMPERATURES VARY …

3. SUBSTANCES RECEIVE THE SAME AMOUNT OF HEAT BECAUSE THEY ARE HEATED
WITH THE SAME BURNER
THEIR RESPONSE TO THE ABSORTION OF HEAT IS DIFFERENT.
WHY?

4. BECAUSE THEY ARE
DIFFERENT SUBSTANCES
WITH DIFFERENT
PROPERTIES.

5. WHICH SUBSTANCE HEATS FASTER? (REMEMBER THEY ABSORB THE SAME
AMOUNT OF HEAT PER SECOND)

6. AFTER 800 SECONDS ONE SUBSTANCE IS AT 52ºC
WHILE THE OTHER IS AT 84ºC
84ºC
52ºC

7. WHICH ONE CHANGES ITS TEMPERATURE
FASTER? THE “BLUE” OR THE “RED” ONE?
WHY?

8. FOR SAME VALUES OF TIME
(AND HAVING ABSORBED THE SAME
AMOUNT OF HEAT)
ONE SUBSTANCE (THE RED
ONE) IS ALWAYS AT A
HIGHER TEMPERATURE

9. BEING DIFFERENT SUBSTANCES THEY HAVE
DIFFERENT PROPERTIES.
HEAT CAPACITY: IS A PROPERTY OF SUBSTANCES
THAT MEASURES THE ABSORTION OF HEAT AND
THE CONSEQUENT INCREASE OF TEMPERATURE.
DIFFERENT SUBSTANCES WILL HAVE DIFFERENT HEAT CAPACITIES.
DEFINITION: HEAT CAPACITY IS THE AMOUNT OF
HEAT REQUIRED FOR A CERTAIN AMOUNT OF
SUBSTANCE TO CHANGE ITS TEMPERATURE 1º C

10. WATER HEAT CAPACITY IS BIGGER
THAN OIL HEAT CAPACITY
WHAT DOES THAT
MEAN?

11. WATER ABSORBS HEAT WITHOUT
CHANGING ITS TEMPERATURE AS MUCH
AS OIL DOES
Water Heat capacity: 4,18 Joules / gram ºC
Oil Heat capacity: 2 Joules / gram ºC

12. WICH LINE IS FOR WATER?
OIL
WATER

13. HOW IS THE ABSORTION OF HEAT RELATED
TO THE TEMPERATURE?

14. What do the particles of a substance do
when the substance absorbs heat?
MOVE
(OR VIBRATE)
FASTER

15. Increasing the particle
movent will mean?

19. States of matter
Heating curves
Changes of phase