2.1.2: Compounds, formula and equations

Question 1

What do ionic equations show ?

Answer 1

• Ions formed in solution
• Which particles are reacting

Question 2

Give the nitrate molecular ion

Answer 2

NO3-

Question 3

Give zinc ion

Answer 3

Zn2+

Question 4

Give silver ion

Answer 4

Ag+

Question 5

Give ammonium molecular ion

Answer 5

NH4+

Question 6

Give sulfate molecular ion

Answer 6

SO42-

Question 7

Give hydroxide molecular ion

Answer 7

OH-

Question 8

Give carbonate molecular ion

Answer 8

CO32-

Question 9

Describe what would happen in a reaction between an acid and ZNCO3

Answer 9

• Effervescence
• Solid (ZNCO3) would disappear (dissolve)

Question 10

Give 2 calcium compounds which could increase the alkalinity of soil

Answer 10

Ca(OH)2
CaO

Question 11

Suggest formula of ions present in H4N2O3

Answer 11

NO3- and NH4+

Question 12

Give the formula for aluminium bromide and aluminium chloride

Answer 12

AlBr3 and AlCl3

Question 13

What is the formula of a nitride ion ?

Answer 13

N3-

Question 14

Give formula for phosphoric acid

Answer 14

H3PO4

Question 15

Give the formula of the nitrogen ion within nitric acid

Answer 15

NO3-

Question 16

Give the formula of the aqueas ions in Sr(OH)2

Answer 16

Sr2+ and OH-

Question 17

What do numbers in brackets show ?

Answer 17

The oxidation number of the element

Question 18

Suggest formula of acid used to make SrSO3

Answer 18

H2SO3

Question 19

What do the brackets in sodium chlorate (VII) indicate ?

Answer 19

The oxidation number of chlorine is +7