Topic 8 + 9 Flashcards Preview

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Flashcards in Topic 8 + 9 Deck (50):
1

What do Alkalis do when they dissolve in water?

They release OH- ions

2

What is an Alkali?

A soluble base that produces Hydroxide ions when dissolved in water

3

What symbol shows that a substance is toxic?

Skull and crossbones

4

What colour does Phenolphthalien change with acid?

Colourless

5

What colour does Phenolphthalien change to with Alkalis?

Pink

6

What colour does Universal Indicator change to with a solution of pH 1-2?

Red

7

What colour does Universal Indicator change to with a solution of pH 3-6?

Yellow

8

What colour does Universal Indicator change to with a solution of pH 7?

Green

9

What colour does Universal Indicator change to with a solution of pH 8-11?

Blue

10

What colour does Universal Indicator change to with a solution of pH 12-14?

Purple

11

What apparatus can you use to more accurately measure pH?

A pH meter

12

What is ionisation?

This is when a solution loses Hydrogen ions

13

How much ionisation occurs with strong acids dissolving in water?

Complete ionisation

14

How much ionisation occurs when weak acids dissolve in water?

Partial ionisation

15

What is a base?

A compound that will neutralise an acid

16

What compounds are often bases?

Metal Oxides/Hydroxides

17

Give 4 examples of Neutralisation reactions in life?

Inigestion Tablets neutralising Stomach acid
Lime neutralising acidic soil
Lime neutralising acidic water
Acidic Docking Leaf neutralising Wasp Sting

18

What is Neutralisation?

This is when an equal amount of H+ ions from an acid and OH- ions from an alkali react to form water

19

What is a Salt?

When a metal (or Ammonium ion) takes the place of hydrogen in an acid, the compound that forms is called a salt

20

Acid + Metal --->?

Salt + Hydrogen

21

Acid + Metal Carbonate --->?

Salt + Carbon Dioxide + Water

22

Acid + Alkali--->?

Salt + Water

23

Acid + Base--->?

Salt + Water

24

What compounds are often acidic?

Non metal oxides
Other compounds also

25

What are Amphoteric Compounds?

Compounds that react with acids and alkalis

26

Give 2 examples of Amphoteric Compounds?

Aluminium Hydroxide
Zinc Hydroxide

27

What 2 methods are used in preparation of salts?

Titration
Excess solid

28

When is Excess Solid used?

If the Salt produced will be Soluble, and the Base, Metal, or Metal Carbonate reacting with the Acid is insoluble. Excess solid will be used

29

When is Titration used?

If the salt that is produced is soluble, and the Base, Metal, or Metal Carbonate reacting with the acid is soluble, then Titration is used

30

Go through 9 steps of Titration?

1. Pipette 25cm3 of substance that isn't acid in to conical flask
2.'Add Phenolphthalien indicator, turns pink
3. Fill Burette with Hydrochloric Acid
4. Add acid to conical flask until colour changes to colourless
5. Record volume of Hydrochloric acid added
6. Repeat without indicator to obtain solution of salt and water
7. Put solution in to evaporating basin, heat and reduce volume by half
8. Leave to cool and crystallise
9. Filter crystals and dry between filter paper

31

Go through 7 steps of Excess Solid?

1. Measure 25cm3 of Hydrochloric Acid in to conical flask
2. Add excess of insoluble substance that isn't acid, to HCl
3. Heat and stir
4. Filter off insoluble solid to leave salt solution
5. Put solution in to evaporating basin, heat reduce volume by half
6. Leave to cool and crystallise
7. Filter crystals and dry between filter paper

32

Name 3 ways to dry crystals?

Dry between filter paper
Dessicator
Low temperature oven

33

Give 3 steps of Precipitation Reaction? (Preparation of Insoluble Salt)

1. Place 15cm3 for each of the 2 soluble compounds in to a beaker
2. Mix solutions until insoluble salt is formed
3. Filter insoluble salt and wash with distilled water, and dry between filter paper

34

Colour of Sodium ion when burned?

Yellow

35

Colour of Potassium ion when burned?

Purple/lilac flame

36

Colour of Barium ion when burned?

Apple Green

37

Colour of Calcium ion when burned?

Red

38

Colour of Copper ion when burned?

Green/blue

39

When Sodium Hydroxide is added to Magnesium ions, what colour is the precipitate? What does this indicate?

White, indicates Cations

40

When Sodium Hydroxide is added to Aluminium ions, what colour is the precipitate? What does this indicate?

White, indicates Cations

41

When Sodium Hydroxide is added to Zinc ions, what colour is the precipitate? What does this indicate?

White, indicates Cations

42

When Sodium Hydroxide is added to Copper ions, what colour is the precipitate? What does this indicate?

Blue, indicates cations

43

When Sodium Hydroxide is added to Iron (II) ions, what colour is the precipitate? What does this indicate?

Green, indicates Cations

44

When Sodium Hydroxide is added to Iron (III) ions, what colour is the precipitate? What does this indicate?

Red/brown, indicates Cations

45

When adding Silver Nitrate to Chlorine ions, what colour is precipitate?

White

46

When adding Silver Nitrate to Bromine ions, what colour is precipitate?

Cream

47

When adding Silver Nitrate to Iodine ions, what colour is precipitate?

Yellow

48

What colour is Precipitate when Barium Chloride is added to a compound containing sulfate ions?

White

49

When Hydrochloric Acid is added to a Compound containing Carbonate ions, what 3 observations are made?

Bubbles of gas
Compound solid disappears
Limewater turns cloudy

50

What do Acids do when dissolved in water?

Realease H+ ions