State the Standard Index for Density (1)
Kg/m3
Explain why it is impossible for a device to be 100% efficient (3)
No device is 100% efficient as there will always be some wasted energy transferred to the surroundings (dissipated)
State the 3 main ways in which energy resources are used (3)
Transport, heating and electricity
What is the equation for density?
Density=mass/volume
Name 2 non renewable energy resources
Coal, gas
Name 2 renewable energy resources
Wind, solar

Describe how the arrangement and movement of particles in a solid are different to the arrangement of particles in a liquid
particles in a solid vibrate about a fixed point. They are arranged with a regular pattern. The particles in a liquid are not in fixed positions and can move past eachother freely. they are an irregular arrangement.
Explain how you could improve the efficiency of a motor (2)
To reduce loss of thermal energy due to friction, the moving parts can be lubricated
Define thermal conductivity and explain how this links to the materials used in the home (3)
thermal conductivity is a measure of how quickly a material transfers thermal energy. a house uses materials such as cavity wall insulation/loft insulation made of low thermal conductivity materials as they are insulators
Describe a procedure to find the volume of an irregular object using a eureka can (3)
Fill a displacement can with water up to the spout. Place the object in the water (fully submerged) and collect the displaced water in a measuring cylinder which comes out of the spout. the volume of water in the measuring cylinder is equal to the volume of the object.
State the 3 fossil fuels
Coal, Oil, Gas
What are 2 disadvantages of fossil fuels?
they produce air pollution such as greenhouse gases (CO2), can cause acid rain and some require mining
In an experiment describe what is meant by the following variables:
independent, dependent and control
Independent- The factor that is changed during the experiment
Dependent- The quantity that is measured
Control- Factors that are kept the same throughout the experiment to ensure a fair test and accuracy
Explain which state of matter has the lowest density (2)
Density is the mass per unit volume, so gases are the state of matter with the lowest density because the particles in a gas are spread far apart
State the law of conservation of energy
Energy cannot be created or destroyed, it can only be transferred between energy stores
