Describe the law of conservation of mass. How do you know if a chemical equation is in accord with this law?
A deep lake in Minnesota is covered with ice. What is the water temperature at the bottom of the lake? Explain your reasoning.
Describe at least four different examples of how you could make hard water soft.
What is the difference between high-octane and regular gasoline? Many people feel that they will get better performance by using a higher-octane gasoline in their vehicles. Does scientific evidence bear this out?