Heat capacity heating_curves
description
Transcript of 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