Question 1: Which of the following best describes the forces that generate geothermal power?
- Heat energy beneath the Earth's surface heats underground water into steam.
- Heat from the Earth s core and pressure transform the remains of dead plants and animals.
- Energy of the sun strikes photovoltaic cells producing a flow of electrons.
- Heat energy is released during nuclear fission and steam is produced to turn a turbine.
Question 2: Which of the following circumstances will result in a reaction that is spontaneous at all temperatures?
- positive enthalpy change and positive entropy change
- negative enthalpy change and negative entropy change
- positive enthalpy change and negative entropy change
- negative enthalpy change and positive entropy change
Question 3: Water is a polar molecule and attracts other polar molecules. Which of the following is a consequence of this property?
- Water is considered to be a universal solvent.
- Water can only dissolve a limited amount of solute.
- When water freezes, the molecules move farther apart.
- The water in lakes and ponds freezes from the top down.
Question 4: What is the correct balanced equation for the following equilibrium constant expression?
- CO2 (g) CO (g) + O2 (g)
- CO2 (g) CO (g) + O2 (g)
- 2 CO2 (g) 2 CO (g) + O2 (g)
- 2CO (g) + O2 (g) CO2 (g)
Question 5: In the chemical reaction shown below, which element was oxidized?
2K + Cl2 2KCl
- K, because it lost one electron
- K, because it gained one electron
- Cl, because it lost one electron
- Cl, because it gained one electron