Moving Particles
Temperature
Thermal Energy Transfer
Boiling, Evaporation, Specific Heat Capacity
Expansion
100
True or False. Solids have kinetic energy.
True
100
What do you do to convert Celsius to Kelvin?
Add 273 to Celsius temperature.
100
List 3 ways of how thermal energy can be transferred.
Conduction, convection and radiation
100
What is boiling?
Boiling is a very fast form of evaporation that happens at every point of a liquid.
100
True or False. When you expand solids, the distance between particles increases.
True.
200
Which state of matter has almost no attraction force between the particles?
Gas
200
What is heat?
Heat is the energy that is transferred from one substance to another due to difference in their temperatures.
200
Why is it impossible for convection to happen in solids?
Convection cannot happen in solids because solids cannot flow.
200
Give 1 difference between boiling and evaporation.
Evaporation happens on the surface of the liquid while boiling happens all throughout the liquid. Evaporation happens at every temperature while boiling happens at boiling point of the liquid only.
200
What is the relationship between pressure and temperature in gases?
Pressure and temperature in gases are directly proportional to each other.
300
What is internal energy?
Internal energy is the sum of total kinetic energy and total potential energy of particles of a substance.
300
What should you do to mark the lower fixed points in a thermometer?
Put the thermometer in a glass full of pure melting ice, then mark the end point of the line in the thermometer 0 degrees Celsius.
300
Give 3 ways on how you can insulate your house.
1) Double glazed windows. 2) Put foam inside walls. 3) Loft insulation.
300
What are the four factors that affect rate of evaporation?
1)Blow air across the surface. 2)Humidity. 3)Temperature. 4)Increase surface area.
300
What is the law where pressure is inversely proportional to volume?
The Boyle's Law.
400
Explain how gas particles apply pressure to their container.
The gas particles move freely in random directions and the gas particles collide with each other and the walls of their container. This is how gas particles apply pressure to their containers.
400
Until when do heat energy transfer and how do heat energy get transferred?
Heat energy transfer continues until two objects reach the same temperatures. This happens through transfer of vibrations of hot object's particles to cold object's particles.
400
Explain how air above the heater rises in a convection current.
Air particles above the heater start moving faster which makes the air particles expand. Due to this, density of gas decreases and the air above the heater rises.
400
How much thermal energy is required to raise 6 kg of water's temperature by 4 degrees Celsius? (water = 4200J/degree Celsius.kg)
E=m.c.change in temperature E= 6.4200.4 E=100,800 J
400
Pressure of gas at 57 degrees Celsius is 4 atm. Calculate pressure when temperature is increased to 228 degrees Celsius.
57 + 273 = 330 K 228 + 273 = 501 K Pi/Ti = Pf/Tf 4/330 = Pf/501 Pf = (4 . 501)/330 Pf = 6.07 atm
500
Explain the Brownian Motion.
The Brownian motion is the evidence of existence of particles. When you put dust/pollen/smoke particles under a microscope, you will see a zig-zag pattern. This is caused by the air particles colliding with the dust/pollen/smoke particles.
500
How do Thermistor thermometers work?
When temperature rises, thermistor's resistance decreases and this allows more current to flow through its circuit. So the number on the screen increases and shows the temperature.
500
Explain why solids are best conductors of thermal energy?
Solids are the best conductors of thermal energy because particles in solids are very close to each other which helps the particles pass on their vibrations easily.
500
8,400 J of energy is supplied to 350 g of water at 15 degrees Celsius. What is the final temperature of water? (water = 4200 J/degree Celsius.kg)
350/1000 = 0.35 kg E= m.c. (TF- TI) 8400= 0.35 . 4200 . (TF - 15) TF - 15 = 8400/ (0.35 . 4200) TF = 5.71 + 15 TF = 20.71 degrees Celsius
500
At constant temperature, the gas in the container has a volume of 400 cubic centimeters at a pressure of 8 atm. What happens to pressure if volume is increased to 800 cubic centimeters?
P1 . V1 = P2 . V2 8 . 400 = P2 . 800 P2 = (8.400)/800 P2= 4 atm
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