I’ll really appreciate it if you help me out on these 2 questions .

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

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.

Connect the whole numbers on the periodic table to indicate what they represent?