Unit 1 - JA

Question 1

Isotope definition

Answer 1

Isotopes have different numbers of neutrons but the same number of electrons and protons, making them chemically unstable

Question 2

Relative atomic mass definition

Answer 2

The weighted mean mass of an atom of an element compared to 1/12 the mass of an atom of carbon-12

Question 3

Relative isotopic mass definition

Answer 3

The weighted mean mass of an isotope compared to 1/12 the mass of an atom of carbon-12

Question 4

Ammonium

Answer 4

NH4+

Question 5

Hydroxide

Answer 5

OH-

Question 6

Nitrate

Answer 6

NO3-

Question 7

Sulfate

Answer 7

SO42-

Question 8

Carbonate

Answer 8

CO32-

Question 9

Phosphate

Answer 9

PO43-

Question 10

Phosphoric acid

Answer 10

H3PO4-

Question 11

Sulfuric acid

Answer 11

H2SO4

Question 12

Nitric acid

Answer 12

HNO3

Question 13

Ammonia

Answer 13

NH3

Question 14

Hydrochloric acid

Answer 14

HCl

Question 15

Molar mass definition

Answer 15

The mass in grams of 1 mole of a substance and is given the unit gmol-1

Question 16

What volume does one mole of gas occupy at room temperature and pressure

Answer 16

24dm3

Question 17

Mass =

Answer 17

Moles x Mr

Question 18

Multiple =

Answer 18

Mr / Mr of empirical formula

Question 19

Empirical formula defintion

Answer 19

The simplest whole number ratio in which atoms combine to form a compound

Question 20

Molecular formula definiton

Answer 20

How many of each type of atom there are in each molecule of a compound

Question 21

Hydrated meaning

Answer 21

Crystalline compound containing water molecules

Question 22

Anhydrous meaning

Answer 22

Without water of crystallisation

Question 23

Pv =

Answer 23

nRT

Question 24

Number of particles =

Answer 24

Moles x Avogadro’s constant

Question 25

Volume =

Answer 25

Moles x 24

Question 26

Concentration =

Answer 26

Moles / Volume

Question 27

% yield =

Answer 27

(Actual / Theoretical) x 100

Question 28

Atom Economy =

Answer 28

(Wanted Mr / Total Mr) x 100