Some of the litmus tests took a long time to develop, such as the test for CaO(aq). Suggest an improvement to the experimental design that would fix this problem.

What is the relationship of air masses and the temperature of oceans?

Why do cells appear different in distilled water than they do in 10% salt water?

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.