Specific Latent Heat and Thermal Energy Quiz

What does the specific latent heat of fusion refer to?

• The energy required to raise the temperature of 1 kg of a substance by 1°C

• The energy needed to change 1 kg of a substance from solid to liquid at its melting point

• The energy transferred when a gas condenses into a liquid

Which unit is used for specific latent heat?

• J/kg

• W/kg

• J/°C

What is the correct equation to calculate the thermal energy transferred during a change of state?

• E=mcΔT

• E=Lm

• E=mL

Why is the latent heat of vaporisation much greater than the latent heat of fusion for water?

• Because more energy is required to overcome the forces between particles during vaporisation

• Because gases weigh less than liquids

• Because vapour has a higher temperature than liquid

In the practical experiment involving melting ice, what is the purpose of the joulemeter?

• To measure the mass of melted ice

• To measure the energy transferred to the heater

• To calculate the specific heat capacity of ice

What is the value of the specific latent heat of vaporisation for water, according to the table?

• 334 kJ/kg

• 2250 kJ/kg

• 4.2 kJ/kg

Which of the following best defines latent heat?

• The energy transferred as a substance changes temperature

• The energy transferred when a substance changes state without a change in temperature

• The energy used to raise the boiling point of a liquid

If 0.068 kg of ice is melted using 18,400 J of energy, what is the specific latent heat of fusion of water?

• 270 kJ/kg

• 334 kJ/kg

• 315 kJ/kg

If a joulemeter is not available, how can the energy transferred to a heater be calculated?

• Using a voltmeter and ammeter with the equation E=IVt

• Measuring temperature rise and applying E=mcΔT

• Using a stopwatch and thermometer to track time and rate of change

How does specific heat capacity differ from specific latent heat?

• Specific heat capacity is the energy needed to raise the temperature of 1 kg by 1°C; specific latent heat is the energy to change state without changing temperature

• Specific heat capacity and specific latent heat both involve a change of state

• Specific latent heat only applies to gases, while specific heat capacity applies to solids and liquids