Internal Energy and Specific Heat Capacity

Define internal energy and explain its relationship with the temperature of a substance.

• Internal energy is the sum of the kinetic and potential energies of the particles within a substance. It is directly related to the temperature of a substance, as an increase in temperature leads to an increase in the kinetic energy of the particles, thus increasing the internal energy.

• Internal energy is the energy stored in the bonds between atoms, and it has no relationship with the temperature of a substance.

• Internal energy is the energy that a substance absorbs from its surroundings, and it is not affected by the temperature.

• Internal energy is the energy that a substance releases to its surroundings, and it decreases as the temperature increases.

A 2 kg block of iron absorbs 5000 J of heat. If the initial temperature of the block was 20°C, what is the final temperature? (Specific heat capacity of iron = 450 J/kg°C)

• 50.75°C

• 15.40°C

• 40.60°C

• 32.22°C

What is the specific heat capacity of water and how does it affect the temperature change of water?

• 10.75 J/g°C

• 2.50 J/g°C

• 4.18 J/g°C

• 6.32 J/g°C

Discuss the applications of specific heat capacity in everyday life.

• Cooking, heating and cooling systems, insulation

• Skiing, snowboarding, ice skating

• Swimming, cycling, running

• Reading, writing, drawing

Explain the kinetic theory of gas and its relationship with internal energy.

• The kinetic theory of gas explains that gas particles are in constant motion and the internal energy of a gas is related to the kinetic energy of its particles.

• The kinetic theory of gas explains that gas particles are in constant motion and the internal energy of a gas is related to the potential energy of its particles.

• The kinetic theory of gas explains that gas particles are in constant motion and the internal energy of a gas is not related to the kinetic energy of its particles.

• The kinetic theory of gas explains that gas particles are at rest and the internal energy is related to the potential energy of its particles.

A 3 kg block of copper is heated from 20°C to 80°C. If the specific heat capacity of copper is 390 J/kg°C, how much heat is absorbed by the block?

• Q = (3 kg)(390 J/kg°C)(80°C - 20°C) = 54,600 J

• Q = (3 kg)(390 J/kg°C)(80°C - 20°C) = 5,460 J

• Q = (3 kg)(390 J/kg°C)(80°C + 20°C) = 54,600 J

• Q = (3 kg)(390 J/kg°C)(80°C - 20°C) = 15,600 J

How does the specific heat capacity of a substance affect its ability to store and release heat?

• It affects the substance's ability to store and release heat.

• It causes the substance to release heat but not store it.

• It only affects the substance's ability to store heat, not release it.

• It has no effect on the substance's ability to store and release heat.

Discuss the factors that affect the specific heat capacity of a substance.

• Color, density, and volume

• Pressure, state of matter, and electrical conductivity

• Mass, temperature, and molecular structure

• Atomic number, boiling point, and solubility