For balancing chemical equations, when do you need to add, when do you you need to divide?

Ex: NH3+O2➡️NO + H2O
N: 1. N:1
H: 3. H:2
O: 2. O:3

What are the chemical names of these compounds? ke: mg3n2: reset next

What are the advantages of using the metric system? designed as a decimal system making conversions simpler more accurate system of measurement has prefixes that correspond to an amount to use with all base units used by the entire scientific community

Which statement characterizes synthetic polymers? a. they come from animals and plants. b. they are found in nature. c. they are made in a lab. d. they are components of starch.