Acids Bases And Salts

Question 1

Everyday acids

Answer 1

Lemon juice, vinegar, soft drinks

Question 2

What do acids do when dissolved in water

Answer 2

Release positively charged hydrogen ions

Question 3

Properties of acids

Answer 3

Corrosive, conducts electricity, sour taste

Question 4

What do soluble bases (.i.e alkalis) do when dissolved in water

Answer 4

Release hydrogen ions

Question 5

Properties of bases

Answer 5

Conducts electricity, bitter, slippery, corrosive

Question 6

Everyday example of bases

Answer 6

Chalks, soap, cleaning products

Question 7

What is a indicator

Answer 7

A chemical that gives a colour change in acidic, alkaline, and neutral solutions

Question 8

Colour of phenolphthalein in acid

Answer 8

Colourless

Question 9

Colour of phenolphthalein in alkali

Answer 9

Pink

Question 10

Colour of phenolphthalein in neutral

Answer 10

Colourless

Question 11

Colour of methyl orange in acid

Answer 11

Red

Question 12

Colour of methyl orange in alkali

Answer 12

Yellow

Question 13

Colour of methyl orange in neutral

Answer 13

Orange

Question 14

What does a pH meter record to

Answer 14

Records the pH to two decimal places

Question 15

A ……. Acid ionises completely in water

Answer 15

Strong

Question 16

A ……. Acid ionises partially in water

Answer 16

Weal

Question 17

A ……. Alkali ionises completely in water

Answer 17

Strong

Question 18

A ……. Alkali ionises partially in water

Answer 18

Weak

Question 19

Acids dissolve in water to produce

Answer 19

H+ ions

Question 20

Alkalis dissolve in water to produce

Answer 20

OH- ions

Question 21

A concentrated acid contains a …….. number of acid particles dissolved per unit volume

Answer 21

Large

Question 22

A dilute acid contains a ……. Number of acid particles dissolved per unit volume

Answer 22

Small

Question 23

Neutralisation definition

Answer 23

The reaction between an acid and an alkali producing a salt and water

Question 24

What is a salt

Answer 24

The compound formed when some or all of the hydrogen ions in an acid are replaced with metal ions or ammonium ions

Question 25

Hydrogen test

Answer 25

Apply a lighted splint Squeaky pop is heard

Question 26

Carbon dioxide test

Answer 26

Bubble gas through lime water Limewater changes colour from colourless to milky white

Question 27

Observations of reactions

Answer 27

If gas produced - bubbles of gas produced If a solid - solid disappears and solution is produced If solution produced - mention colour Most acid reactions (except copper oxide + acid, sodium hydrogen carbonate + acid) are exothermic - heat is released

Question 28

Colour of copper (ll) oxide

Answer 28

Black solid

Question 29

Colour of copper (ll) carbonate

Answer 29

Green solid

Question 30

Colour of hydrated copper (ll) sulfate

Answer 30

Blue crystals

Question 31

Colour of copper (ll) salts in solution

Answer 31

Blue solution

Question 32

Colour of group 1, group 2, aluminium and zinc compounds

Answer 32

White solids and if dissolved go colourless

Question 33

Methods of drying salts

Answer 33

Dessicator Low temp oven Dry between two sheets of filter paper