What coefficients must be added to balance the following reaction?
pb + h3po4 yields h2 + pb3(po4)2
a: 3, 2, 1, 1
b: 3, 2, 2, 1
c: 3, 1, 3, 1
d: 3, 2, 3, 1

Which describes fat? a: a carbohydrate that produces energy b: a nucleic acid that directs cell function c: a lipid that stores energy d: a protein that speeds up a chemical reaction