How many moles of NH3 can be formed by 5.00 miles of H2

The rules of engagement (roe) working group is often used to (select all that apply.)

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.

Amixture with the same composition throughout is!