Reference no: EM13586400

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