Atoms and reactions

Question 1

Define relative molecular mass

Answer 1

Compares the mass of a molecule with 1/12th of the mass of an atom of carbon-12

Question 2

Define relative formula mass

Answer 2

Compares the mass of a formula unit with 1/12th of the mass of an atom of carbon-12

Question 3

What is the amount of substance( mole ) is…

Answer 3

Is the amount of any substances containing as many particles as there are more carbon atoms in exactly 12g of carbon-12

Question 4

What is avogadros constant

Answer 4

The number of particles in one mole of any substance, which has the value of 6.02x10 to the power of 23

Question 5

Define molar mass

Answer 5

The mass (in grams) per mole of substance (g mol-1)

Question 6

Define empirical formula

Answer 6

The simplest whole number ratio of atoms of each element in a compound

Question 7

Define molecular formula

Answer 7

Is the actual number of atoms of each element in a compound

Question 8

Define hydrated

Answer 8

A compound which has water molecules ( waters of crystallisation) incorporated

Question 9

Define anhydrous

Answer 9

The compound which remains when all the waters of crystallisation have been removed

Question 10

Define waters of crystallisation

Answer 10

Water molecules which make up the part of the crystal structure of a compound, that can be removed by heating

Question 11

Define molar gas volume

Answer 11

Is the volume per mole of gas molecules at a stated temperature and pressure ( dm3 mol-1)

Question 12

Define concentration of a solution

Answer 12

Is the amount of solute in mol, dissolved in 1dm3 of solution

Question 13

Define standard solution

Answer 13

Is a solution with a known concentration