How many moles of H2O can be produced with 5.8 moles of O2 ?

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.

Why is the bottom layer of a trophic pyrimid the

Exit what is the density of an object having a mass of 5.0 g and a volume of 45.0 cm3?