heat capacity heating_curves
DESCRIPTION
Heat and heat capacity. 3r ESO - Physics and chemistry -IES Cap de Llevant - Maó - MenorcaTRANSCRIPT
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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 …
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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?
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BECAUSE THEY ARE DIFFERENT SUBSTANCES
WITH DIFFERENT PROPERTIES.
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WHICH SUBSTANCE HEATS FASTER? (REMEMBER THEY ABSORB THE SAME AMOUNT OF HEAT PER SECOND)
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AFTER 800 SECONDS ONE SUBSTANCE IS AT 52ºC WHILE THE OTHER IS AT 84ºC
52ºC
84ºC
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WHICH ONE CHANGES ITS TEMPERATURE FASTER? THE “BLUE” OR THE “RED” ONE?
WHY?
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FOR SAME VALUES OF TIME (AND HAVING ABSORBED THE SAME
AMOUNT OF HEAT) ONE SUBSTANCE (THE RED
ONE) IS ALWAYS AT A HIGHER TEMPERATURE
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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
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WATER HEAT CAPACITY IS BIGGER THAN OIL HEAT CAPACITY
WHAT DOES THAT MEAN?
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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
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WICH LINE IS FOR WATER?
WATER
OIL
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HOW IS THE ABSORTION OF HEAT RELATED TO THE TEMPERATURE?
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What do the particles of a substance do when the substance absorbs heat?
MOVE (OR VIBRATE)
FASTER
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Increasing the particle movent will mean?
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States of matter
Heating curves
Changes of phase