What kind of crystalline solid is nickel (Ni)?
O
A. Molecular solid
O
O
O
B. Ionic solid
C. Metallic solid
D. Network solid

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.