14. The diagram shows a non-uniform mass of clay being placed into a measuring cylinder of water.

(1 ml of liquid = 1 cm³)

Using information from the diagram above, what is the density of the clay?

• A) 0.6 g/cm³
• B) 1.6 g/cm³
• C) 1.7 g/cm³
• D) 6.8 g/cm³

Mass of block (m) = 2kg

SHC of copper (c) = 800 J/kg/⁰C

ΔE = m x c x Δθ

Using the data here, find the heat energy supplied to the block.

• A) 80 kJ
• B) 800 kJ
• C) 40kJ
• D) 400kJ

16. A kettle is boiling and the water (at 100⁰C ) is turning to steam. If the kettle supplies 113 kJ of energy, what mass of water is turned to steam?

• A) 50g
• B) 5g
• C) 20g
• D) 20kg

E = m x L

The specific latent heat (L) for turning water to steam is 2260 kJ /kg

17. As the water changes state, it changes properties. Wood also does this when it burns. Are these changes reversible or irreversible?

? A B C D

18. Hot liquid candle wax cools and turns back into solid wax.

Which of these graphs shows the likely temperature change of the wax over time?

19+20: The diagram shows particles of a gas inside a box.

19. If we heat the box up, which of these statements is true?

• A) The particles move closer together
• B) The particles move slower
• C) The particles expand
• D) The particles have more kinetic energy

20. What happens to the pressure in the box as the gas is heated?

• A) The pressure increases as the particles produce more force through higher speed collisions with the sides.
• B) The pressure increases as the particles expand.
• C) The pressure stays the same as there are the same number of particles in the box.
• D) The pressure stays the same as the mass of each particle stays constant.