PB1.Q.9.i

What is the formula for calculating the heat (Q) gained or lost by a substance when its temperature changes?

• Q = mL

• Q = mcΔT

• Q = CΔT

• Q = L/m

What does 'c' represent in the formula Q = mcΔT?

• Specific latent heat

• Specific heat capacity

• Heat capacity

• Thermal conductivity

What is the specific heat capacity of water, as given in the problem?

• 4.2 Jg-1°C-1

• 336 Jg-1

• 2.1 kg

• 50 °C

What is the change in temperature (ΔT) of the water as it cools down?

• 75 °C

• 25 °C

• 50 °C

• 100 °C

How much heat is lost by 2.1 kg of water when it cools from 75°C to 25°C?

• 4.2 x 105 J

• 4.41 x 105 J

• 105 J

• 157.5 J

What is the formula for calculating the heat (Q) required to melt a substance of mass 'm'?

• Q = mcΔT

• Q = mL

• Q = CΔT

• Q = L/m

What does 'L' represent in the formula Q = mL?

• Specific heat capacity

• Specific latent heat

• Heat capacity

• Thermal conductivity

What is the specific latent heat of ice, as given in the problem?

• 4.2 Jg-1°C-1

• 336 Jg-1

• 2.1 kg

• 50 °C

After the ice melts, what will be the initial temperature of the melted ice (water)?

• 0°C

• 25°C

• 75°C

• 100°C

What is the final temperature of the water that was initially ice?

• 0 °C

• 25 °C

• 50 °C

• 75 °C