Acell placed in a hypertonic solution which of the following describe the resulting osmosis

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.

How many moles of oxygen react with 12 moles of aluminum

Describe the forces both attractive and repulsive that occur as two atoms move closer together.