How many molecules are in 0.288 moles of water?

What forms when chemical reactions combine pollution with sunlight?

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

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.