Calorimetry Flashcards
Define heat
Heat is that form of energy which flows from a hot body to a cold body when they are kept in contact
Measure of the quantity of heat is called
Calorimetry
1 calorie=
4.186J
1 kilo-calorie=
4200J nearly
Define temperature
Temperature is a parameter which tells the thermal state of a body.It determines the direction of flow of heat when 2 bodies at different temperature are placed in contact.
3 factors which affect the quantity of heat absorbed to increase the temperature of the body
1)mass of the body
2)increase in temperature of the body
3)material of the body
Heat capacity
the amount of heat energy required to raise its temperature by 1C
Specific heat capacity
the amount of heat energy required to raise its temperature of unit mass of the body by 1C
_______the mass of the body_______is the heat capacity
more
A good conductor of heat has______specific heat capacity while a bad conductor has_______specific heat capacity
low,high
Substance with low specific heat capacity shows
rapid and high rise in temperature
Why is calorimeter made with thin sheet of copper?
1) Good conductor of heat
2) low specific heat capacity
Why is the outer and inner surface of calorimeter polished?
to reduce the loss of heat due to radiation
Why is the calorimeter covered with a wooden lid?
To avoid heat loss by convection
What is the principle of calorimetry/method of mixture
heat energy lost by the hot body=heat energy gained by the cold body. This is called the principle of method of mixture(or principle of calorimetry.
The base of a cooking pan is made thick
By making it thick the heat capacity becomes large due to which it gets heated slowly and imparts sufficient heat energy at a slow rate to the food for its proper cooking.
Liquid to vapour state:
Vaporisation
Vapour/gas to liquid:
Condensation
Solid to vapour:
Sublimation
Vapour to solid
Solidification
What is melting?
The change from solid to liquid phase by the absorption of heat at a constant temperature is known as melting.
What is melting point?
The constant temperature at which solid changes to liquid is known as melting point.
Whats the melting and freezing point for a pure substance?
Identical
