heat capacity heating_curves

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 …

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?

BECAUSE THEY ARE DIFFERENT SUBSTANCES

WITH DIFFERENT PROPERTIES.

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

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

52ºC

84ºC

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

WHY?

FOR SAME VALUES OF TIME (AND HAVING ABSORBED THE SAME

AMOUNT OF HEAT) ONE SUBSTANCE (THE RED

ONE) IS ALWAYS AT A HIGHER TEMPERATURE

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

WATER HEAT CAPACITY IS BIGGER THAN OIL HEAT CAPACITY

WHAT DOES THAT MEAN?

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

WICH LINE IS FOR WATER?

WATER

OIL

HOW IS THE ABSORTION OF HEAT RELATED TO THE TEMPERATURE?

What do the particles of a substance do when the substance absorbs heat?

MOVE (OR VIBRATE)

FASTER

Increasing the particle movent will mean?

States of matter

Heating curves

Changes of phase