8. Thermochemistry

How much energy is required to convert 50.0 g of water at 100°C to 50.0 g of steam at 100°C? (Given: The enthalpy of vaporization of water at 100°C is 40.7 kJ/mol.)

Why do particles in a substance move faster when heat is added?

How does the addition of thermal energy affect the molecules in a substance?

Which of the following processes are primarily responsible for the emission of light in fireworks?

Why do the products of an exothermic chemical reaction contain less energy than the starting reactants?

Which of the following best describes the effect of lower potential energy on a chemical system?

Why does evaporation cool the liquid left behind?

Which statement best describes the relationship between energy, chemical bonding, and stability?

When molecules are heated, which of the following best describes what happens to them?

In which of the following examples does chemical energy change to electrical energy?

When heat is added to water, what happens to the water molecules?

Which of the following best explains what causes the release of energy from a chemical bond?

Which statement best explains the relationship between evaporation and temperature?

What type of energy is stored in chemicals?

As molecules are heated, which of the following best describes what happens to them?