Calorimetry Practice

Front

Thermal energy ALWAYS moves from _____ to _____?

Back

hot to cold.

Front

What happens to the heat when a metal cube at 70°C is immersed in water at 20°C?

Back

The metal loses the same amount of heat that the water gains.

Front

What is the heat of combustion per mole of quinone (C6H4O2) if a 2.200 g sample is burned in a calorimeter with a heat capacity of 7.854 kJ/°C, raising the temperature from 23.44°C to 30.57°C?

Back

-2700 kJ/mol.

Front

How do you calculate the specific heat of an unknown substance when it reaches equilibrium with aluminum?

Back

Use the equation mC(Tf – Ti) + mC(Tf – Ti) = 0.

Front

What is the specific heat of a metal cube with a mass of 55 grams at 85°C immersed in 150 grams of water at 20°C, reaching a final temperature of 23°C?

Back

0.55 J/g°C.

Front

Define specific heat capacity.

Back

The amount of heat required to raise the temperature of 1 kg of a substance by 1°C.

Front

What is calorimetry?

Back

The science of measuring the heat of chemical reactions or physical changes.

Front

What is the principle of conservation of energy in calorimetry?

Back

Energy lost by the hot object equals energy gained by the cold object.

Front

What is a bomb calorimeter used for?

Back

To measure the heat of combustion of a substance.

Front

What is the formula for calculating heat transfer?

Back

q = mCΔT, where q is heat, m is mass, C is specific heat, and ΔT is the change in temperature.