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Chemistry > Chemistry unit 2 acids and alkalis > Flashcards

Chemistry unit 2 acids and alkalis Flashcards

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1
Q

What is a dye?

A

a substance that can change the colour of fabrics

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2
Q

Which indicators turn red in acid?

A

Beetroot, red onion and litmus

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3
Q

When using Universal indicator what colour is an acid?

A

reds and oranges

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4
Q

When using Universal indicator what colour is an alkali or base?

A

blues and purples

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5
Q

When using Universal indicator what colour is neutral?

A

Green

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6
Q

What PH is a strong acid?

A

0 - 4

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7
Q

What PH is a weak acid?

A

5 - 6

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8
Q

What PH is a strong alkali?

A

11 - 14

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9
Q

What PH is a weak alkali?

A

8 - 11

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10
Q

What PH is neutral?

A

7

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11
Q

Name an everyday acid you have at home

A

vinegar, lemon juice, apple juice

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12
Q

Name an everyday alkali you have at home

A

bleach, toothpaste, baking soda

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13
Q

name an everyday drink that is PH neutral

A

Water

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14
Q

Why does red cabbage make a good indicator?

A

Because the colour change is significant in acids and alkalis

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15
Q

How could you make indicator paper from red cabbage dye?

A

soaking paper in red cabbage and drying it

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16
Q

Name three safety precautions you should take when handling strong acids and alkalis?

A

gloves, goggles, lab coat, lidded containers

17
Q

Name the equipment you would need to extract dye from a plant/leaf/berry

A

pestle and mortar, funnel, beaker,

18
Q

What colour does acid go in red cabbage?

A

pink/red

19
Q

What colour does alkali go in red cabbage?

A

Blue

20
Q

What happens when you add water to a dye

A

It dilutes

21
Q

Why is universal indicator so useful?

A

it changes colour at change in ph

22
Q

What is the disadvantage of single colour change indicators?

A

Once they have changed colour, you can’t tell what the PH is

23
Q

Why is it important to know what Ph soil is?

A

Certain crops like soil to be a particular ph

24
Q

How do you test for the presence of hydrogen?

A

put a glowing splint in the test tube and see if it pops

25
Q

What happens to lime water if you bubble carbon dioxide through it?

A

It goes milky

26
Q

How would you neutralise an acid?

A

Mix it with an alkali

27
Q

How would you neutralise an alkali?

A

Mix it with an acid

28
Q

How to antacid tablets work?

A

they neutralise stomach acid

29
Q

What are the issues of taking lots of antacid tablets?

A

Your stomach will start making more and more acid

30
Q

If you neutralise Hydrogen chloride with Sodium hydroxide, sodium chloride is made and what substance?

A

Water

Chemistry (3 decks)

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