The sum of all oxidation numbers:

in a neutral molecule = 0

in an ion = a + charge

in an ion = the charges on neutral atoms

do not need to be equal on both sides of a chemical equation

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying

gas

explanation:

smoke is the matter of a gas

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.