Which of the following is not an example of separation by physical means? select one: a. distillation b. sublimation c. boiling d. electrolysis

Enzymes affect the reactions in living cells by changing the

What is the percentage of hydrogen in nitrogen trihydride

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.