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Science > Chapter 6: Acid and Alkali > Flashcards

Chapter 6: Acid and Alkali Flashcards

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Biology 101 flashcards
1
Q

What is acid?

A

A substance that produces hydrogen ions when dissolved in water.

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2
Q

Does ion have positive or negative charge?

A

Both, there are positive ion and negative ion.

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3
Q

How does acid tastes?

A

Sour

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4
Q

What is the pH value of acid?

A

<7

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5
Q

Reaction of litmus paper with acid.
Red?
Blue?

A

Red→red

Blue→blue

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6
Q

Does acid react with metal?

A

Yes, they produces hydrogen gas.

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7
Q

What will happen if alkali and acid combine?

A

Neutralises and forms salt and water.

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8
Q

What is organic acid.

A

An acid found in living things that contains carbon and is usually weak acid that is less corrosive

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9
Q

What acid does citrus fruits have?

A

Citric acid.

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10
Q

What acid do apples have?

A

Malic acid

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11
Q

What acid do grapes have?

A

Tartaric acid

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12
Q

What acid does tea have?

A

Tannic acid

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13
Q

What acid does Vineger have?

A

Acetic acid

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14
Q

What acid does yogurt have?

A

Lactic acid

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15
Q

What acid does bees and ants have?

A

Formic acid.

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16
Q

What is an inorganic acid?

A

Inorganic acid is obtained from mineral salt which is usually strong acid and more corrosive, also known as mineral acids.

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17
Q

Give 3 examples of inorganic acid.

A
  • Sulphuric acid
  • Hydrochohloric acid
  • Carbonic acid
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18
Q

What is alkali?

A

A substance that produces hydroxide ions when dissolved in water.

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19
Q

Are all bases alkali?

A

All alkalis are bases but not all bases are alkali.

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20
Q

Name the alkali of potassium oxide + Water.

A

Potassium hydroxide.

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21
Q

Name the alkali of sodium oxide + Water.

A

Sodium hydroxide

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22
Q

Name the alkali of calcium oxide + Water.

A

Calcium hydroxide

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23
Q

How does alkali tastes?

A

Bitter

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24
Q

How does it feel when touching alkali?

A

Slippery

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25
Q

Reaction of litmus paper with alkali.
Red?
Blue?

A

Red→Blue

Blue→Blue

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26
Q

Does alkali react with metal?

A

No

27
Q

Does alkali react with ammonium salt?

A

Yes, it releases ammonia gas when heated together with it.

28
Q

What is alkali mostly used for?

A

Making almost all cleaning items.

29
Q

Name the scientific names of these alkalis.

Caustic soda
Lime water
Ammonia solution

A

Caustic soda - sodium hydroxide
Lime water - calcium hydroxide
Ammonia solution - ammonium hydroxide

30
Q

When does alkali and acid show their properties?

A

Acid and alkalis only show their properties in the presence of water.

31
Q

How to find whether a substance is acidic or alkaline? (5)

A

Tested by:

  • red/blue litmus paper
  • Universal indicator
  • Phenolphthalein
  • Methyl orange
32
Q

How to spell the indicator that is pink in alkali?

A

Phe-nol-ph-tha-le-in

33
Q

What is the coulour of acids and alkalines in a pH colour chart?

A

Red-more acid
Blue/Purple- more alkaline

pH chart macam like rainbow colour

34
Q

Which is the best indicator and state it’s form.

A

Universal indicator, liquid form

35
Q

What will happen if methyl orange be dipped in alkaline?

A

Become yellow.

36
Q

What will happen if methyl orange be dipped in neutral?

A

yellow

37
Q

What will happen if methyl orange be dipped in acid?

A

red

38
Q

What will happen if phenolphthalein is dripped into acid?

A

colourless

39
Q

What will happen if phenolphthalein is dripped into alkaline?

A

pink

40
Q

What will happen if phenolphthalein is dripped into neutral?

A

colourless

41
Q

What will happen if universal indicator be dripped into acid?

A

red

42
Q

What will happen if universal indicator be dripped into alkaline?

A

Blue

43
Q

What will happen if universal indicator be dripped into neutral?

A

Green

44
Q

What is the use of acetic acid?

A
  • Preserving food

- Flavouring food

45
Q

What is the use of absorbing acid?

A

To build up resistance to diseases (it is actually vitamin C)

46
Q

What is the use of boric acid?

A

-Preserve food

47
Q

What is the use of nitric acid?

A

To make fertilisers

48
Q

What is the use of tartaric acid?

A

To make cakes and bicuits (tartar powder)

49
Q

What is the use of aluminium hydroxide?

A

-Make gastric medicine and toothpaste

50
Q

What is the use of ammonium hydroxide?

A

-To make fertilisers

51
Q

What is the use of calcium hydroxide?

A

-Neutralising acidic soil

52
Q

What is the use of magnesium hydroxide?

A

Making milk of magnesia

→ for people who needs gastric juice

53
Q

What is the use of potassium hydroxide?

A

-Make soap and paint removers

54
Q

What is neutralisation?

A

A chemical reaction between an acid and an alkali to form a salt and water

55
Q

What is the format in writing the name of combined alkali and acid?

A

(Alkali) (acid with changed tense)

56
Q

What is the name of hydrochloric acid + sodium hydroxide?

A

Sodium chloride + water

57
Q

How to achieve neutralisation? (labotary)

A

Titration

58
Q

What is titration?

A

Titration is a process where an acid is gradually added from a burrete to an alkali until the end point of neutralisation is reached.

59
Q

What is the end point of titration?

A

The end point is reached when an indicator that has been added to the alkali changes colour.

60
Q

What is usually used as an indicator in titration?

A

phenophthelein and universal indicator.

61
Q

What does the burette contain in titration?

A

acid

62
Q

What does the flask at the bottom contain in titration?

A

alkali and the indicator.

63
Q

How can toothpaste help us?

A

Toothpaste which is alkaline help to neutralise the acid produced by bacteria acting on the food stuck between the teeth.

64
Q

What is the answer key in the application of neutralisation in life?

A

must include both words alkaline and acid .

Science (13 decks)

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