U9.2 – Thermal Properties of Materials

Thermal Properties of Materials

1 / 10

What is the definition of specific heat capacity?

The amount of energy required to raise the temperature of 1 g of a substance by 1 K.

The amount of energy lost when 1 g of a substance has a reduction in temperature of 1 K.

The amount of energy required to raise the temperature of 1 kg of a substance by 1 K.

2 / 10

A 2.8 kg sample of an unknown metal takes 210 kJ of energy to increase its temperature by 26.7 K. Calculate the specific heat capacity of the unknown metal sample.

2.8 J kg^-1K^-1

2809 J kg^-1K^-1

1.570x10⁴ J kg^-1K^-1

1.570x10⁷ J kg^-1K^-1

3 / 10

Select the correct statement

The greater the mass of a substance, the more energy required to increase its overall temperature by 1 K.

The greater the specific heat capacity of a substance, the more energy required to increase its overall temperature by 1 K.

The greater the temperature change of a substance, the greater the energy gained by it.

All of these statements are correct.

4 / 10

Which diagram best represents water molecules at 353.15 K?

A

B

C

D

5 / 10

What is happening at point X on this diagram?

The nitrogen molecules are gaining kinetic energy as the overall temperature of the substance increases.

The nitrogen molecules are gaining potential energy as the overall temperature of the substance increases.

The nitrogen molecules are not gaining kinetic energy, but as their bonds are being broken their potential energy is increasing.

The nitrogen molecules are not gaining kinetic energy, but are becoming hotter as individual molecules increasing their potential energy.

6 / 10

What is happening at point Y on this diagram?

The nitrogen molecules are gaining kinetic energy as the overall temperature of the substance increases.

The nitrogen molecules are gaining potential energy as the overall temperature of the substance increases.

The nitrogen molecules are not gaining kinetic energy, but as their bonds are being broken their potential energy is increasing.

The nitrogen molecules are not gaining kinetic energy, but are becoming hotter as individual molecules increasing their potential energy.

7 / 10

Which statement best describes the specific latent heat of fusion?

The energy required to melt 1 kg of a solid.

The energy required to evaporate 1 kg of a liquid.

The energy required to freeze 1kg of a liquid.

The energy required to condense 1kg of a gas.

8 / 10

Which statement best describes the specific latent heat of vaporisation?

The energy required to melt 1 kg of a solid.

The energy required to evaporate 1 kg of a liquid.

The energy required to freeze 1kg of a liquid.

The energy required to condense 1kg of a gas.

9 / 10

A 0.3 kg metal ring is heated to 130 °C then dropped into 1700 g of water with a temperature of 304 K (c_w = 4180 J kg^-1 K ^-1). Eventually, the ring and water reach a thermal equilibrium of 23 °C. Calculate an estimate for the specific heat capacity of the metal the ring is made from.

1.43x10³ J kg^-1 K ^-1

1.59x10³ J kg^-1 K ^-1

1.86x10³ J kg^-1 K ^-1

6.24x10³ J kg^-1 K ^-1

10 / 10

The 1.80 kW kettle in the prep room is filled with 1.30 L of water and switched on at the start of a 15 minute break and takes two minutes for the water to reach boiling point. Unfortunately, there is an issue and the kettle fails to switch off. At the end of break, a technician walks in after completing their equipment changeovers and manually turns the kettle off, then makes themselves a cup of tea using 330 ml of the boiling water. Assuming no heat loss, how much water remains in the kettle? [L_v = 2.26x10⁶ J kg^-1, density of water at 100°C = 958 kg m^-3]

0.318 L

0.358 L

0.625 L

0.717 L

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