basics

Question 1

relative isotopic mass definition

Answer 1

The relative isotopic mass of an isotope is the mass of the isotope relative to 1/12 of the mass of a carbon-12 atom.

Question 2

relative atomic mass, Ar

Answer 2

The relative atomic mass of an element is the weighted average of the masses of its isotopes on a scale on which a carbon-12 atom has a mass of exactly 12 units

Question 3

molecule

Answer 3

A molecule consists of a fixed number of atoms joined together by covalent bonds

Question 4

relative molecular mass,Mr

Answer 4

The relative molecular mass of a substance is the weighted average of the masses of the molecules on a scale on which a carbon-12 atom has a mass of exactly 12 units.

Question 5

define mole

Answer 5

A mole of substance is the amount of that substance that contains the same number of stated elementary units as there are atoms in 12 g of carbon-12

Question 6

ionic compounds are when

Answer 6

metals react with non metals