Which pair has the stronger ionic bond:

- MgCl2 vs. NaCl2
- NaCl vs. LiCl

List four observations that indicate that a chemical reaction may be taking place

Determine the reaction and balance the following equations urgent due in the morning

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.