1. Assessment date: Name: Y10 Phys Science
State the law of conservation of energy.
Define the following terms
Convection
Radiation
Conduction
Convert between Kelvins and Celcius
Kelvins
Celcius
200
-167 78
9075
-10644
What is black body radiation and why is it important?
Matching.
Identify the method of heat transfer that takes place in each illustration.
The total energy an object has. The more stuff you have the higher this will be.
Any transfer of thermal energy
Transfer of energy by movement of matter
Transfer of energy by contact between two things
Transfer of energy by waves, often through empty space.
Convection
Radiation
Thermal Energy
Conduction
Heat
Hot coffee is stirred with a spoon, the spoon gets hot due to .
A chair is placed several feet from a fire in a fireplace. The side of the chair facing the fireplace gets warm because of
A type of lamp contains coloured liquids. These liquids form globs that break off and rise to the top of the liquid. The globs rise due to .
Near the ceiling of a room the air is warming. The warm air rises because of .
A type of stainless steel cookware has a layer of copper applied to the bottom to help it heat evenly. The copper transfers heat to the pan by .
Warm air over the beach rises while cooler dense air from the ocean rushes in due to .

2. Label the following phase change diagram
In complete sentences explain how a store-bought thermos is designed to stop heat loss from conduction, convection, and radiation.
Complete the following. Convert between mass and moles. Remember significant figures!
What is latent heat of vaporization and latent heat of fusion? How are they different from specific heat capacity?
Compound
Molar mass
Mass
Moles
H2O
18.56
CO2
1.5
FeCl3
3.45
Mg(OH)2
0.223 HF
45.18
H2S
8.91
CH4
34.10
NH3
4.21
AlCl3
4.871
CH3Br
85.10

3. What is the enthalpy change in kJ/mol of copper?
5.0 g of copper was heated from 20°C to 80°C. How much energy was used to heat Cu? (Specific heat capacity of Cu is J/g °C)
What is the enthalpy change in kJ/mol of copper?
How much heat is absorbed by 20g granite boulder as energy from the sun causes its temperature to change from 10°C to 29°C? (Specific heat capacity of granite is 0.1 Jl/gºC)
If a 3.1g ring is heated using 10.0 J, its temperature rises 17.9°C. Calculate the specific heat capacity of the ring.
The temperature of a sample of water increases from 20°C to 46.6°C as it absorbs 5650 J of heat. What is the mass of the sample?
What are some limitations of calorimetry? How can you improve these limitations?

4. Ice at 0 oC is added to 1.0 kg of water at 20 oC, cooling it down to 10 oC. Determine how much ice was added.
A radiator made out of iron of specific heat capacity of 450 J kg-1 K-1 has a mass of 45.0 kg and is filled with 23.0 kg of water of specific heat capacity of 4200 J kg-1 K-1.
Determine the energy required to raise the temperature of the radiator-water system by 1K.
If energy is provided to the radiator at the rate of 450W, calculate how long it will take for the temperature increase by 20.0 oC.
How much ice at -10 oC must be dropped into a cup containing 300g of water at 20 oC in order for the temperature of the water to be reduced to 10 oC? The cup itself has a mass of 150g and is made out of aluminum. Assume that no energy is lost to the surroundings
Calculate how much energy is required to melt 4.5kg ice in at 0 oC to 67 oC water.
Suggest two reasons why covering the liquid surface of a cup of hot chocolate with marshmallows will slow down the loss of energy from the chocolate.