Where do proteins get the energy to combine co2 and other compounds in the calvin cycle?

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.

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom

Is powdered sports drink ionic or covalent ? 10pts !