Use the chart to determine which pair of atoms has the greatest polarity. А. Al-Si
B. S-CI
C. N-H
D. C-N

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.