Heating Curve Energy Calculations

What is the primary purpose of a heating curve in thermodynamics?

• To illustrate the change in state of matter with temperature

• To calculate the mass of a substance

• To determine the chemical composition of a substance

• To measure the volume of a gas

Which formula is used for calculating heat when there is a change in temperature?

• ΔH = Q/m

• Q = mΔH

• Q = mcΔT

• ΔT = Q/mc

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

• Mass of the substance

• Specific heat

• Heat energy

• Change in temperature

For a phase change, which formula is applicable?

• Q = mΔH

• ΔH = Q/m

• Q = mcΔT

• ΔT = Q/mc

What is ΔH of fusion for water?

• 1.90 J/g°C

• 4.18 J/g°C

• 336 J/g

• 2260 J/g

How much energy is required to vaporize 2 grams of liquid water?

• 672 J

• 836 J

• 4520 J

• 76 J

What is the total energy required to heat 2 grams of water from -22°C to 120°C?

• 836 J

• 4520 J

• 672 J

• 6188 J

Why does vaporizing liquid require more energy compared to melting ice?

• Because the mass of water increases

• Because specific heat capacity decreases

• Because the temperature is higher

• Because it requires breaking intermolecular forces