V a r i a n t 1
grade “3”
1.Which thermometers should be used to measure outdoor temperature in the north: mercury thermometers or alcohol thermometers? Why?
2.The specific heat capacity of aluminum is 920 J/kg*°C. What does this mean?
3.How much heat will be released when 2 kg of water freezes at 0 °C?
grade of “4.”
4.How much heat will be released when a 200 kg steel bar weighing 200 kg cools from 800 to 15°C?
5.What amount of heat will be required to melt a piece of copper weighing 10kg if its initial temperature is 185°C?
grade of “5.”
6.How much heat would it take to heat 100kg of water taken at 10°C to 100°C and turn it into steam?
7.Draw an approximate graph for this process. Mark different parts of it and indicate what state they correspond to and what processes are taking place there.
V a r i a n t 2
mark “3”
1.Will naphthalene thrown into boiling water melt? The melting point of naphthalene is 80 °C.
2.The specific heat of melting of tin is 0.59-105J/kg. What does this mean?
3.What amount of heat is required to melt 2 kg of ice taken at 0 °C?
grade of “4.”
4.What is the amount of heat required to vaporize an ox of 250 kg taken at 80°C?
5.How much energy would it take to melt a piece of copper weighing 10kg if the initial temperature of the copper is 15 °C?
score “5”
6.Determine the amount of heat required to transform 200g of ice taken at 0°C into steam at 100°C.
7.Draw an approximate graph for this process. Mark the different parts of the graph and indicate what state they correspond to and what processes occur there.
V a r i a n t 3
grade “3”
1.Will ice melt if brought into a room at a temperature of 0 °C?
2.The specific heat of vaporization of alcohol is 0.9-106J. What does this mean?
3.What amount of energy will be released when 200 g of water vapor is condensed at 100 °C?
score of “4.”
4.What amount of energy will be released when crystallizing 200 g of gold taken at 1500°C?
5.What amount of heat is required to melt 2 kg of lead taken at 27 °C?
grade of “5.”
6.What amount of energy will be released when steam found at 120°C is converted into water at 0°C?
7.Draw an approximate graph for this process. Mark different parts of it and indicate to which state they correspond and what processes take place there.
V a r i a n t 4
mark “3”
1.Is it possible to melt a piece of lead in a tin spoon?
2.The specific heat of vaporization of ether is 0.4-106J. What does this mean?
3.What amount of energy must be expended to melt 100g of gold taken at its melting point?
grade “4”
4.3.How much energy would it take to change 400g of ice, taken at 0 °C, into steam at 100 °C?
5.What amount of energy will be released when water taken at 1000C is transformed into ice at minus 5°C?
Score “5.”
6.How much heat is required to convert 2 kg of water taken at 50 °C to steam at 100 °C?
7.Draw an approximate graph for this process. Mark the different sections and indicate what state they correspond to and what processes occur there.
