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Chemistry Flashcards

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1
Q

An …… is a special solution which changes colour in different conditions

A

Indicator

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2
Q

Any foods include dies, which act as indicators. These foods are usually purple colours, e.g … ……, beetroot, red onion

A

Red cabbage

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3
Q

The .. ….. is used to measure the acidity or alkalinity of a chemical.

A

PH scale

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4
Q

……… can be used to test for acids and alkalis

A

Indicator

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5
Q

A strong acid turns into the colour … once the universal indicator is added

A

Red

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6
Q

Water turns into the colour ….. once the universal indicator is added

A

Green

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7
Q

Strong alkali turns into the colour ….. once the universal indicator is added

A

Purple

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8
Q

What is the pH scale range?

A

0 to 14

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9
Q

A Solution that has a pH of six and below are?

A

Acidic

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10
Q

A Solution that has a PH of eight and higher are?

A

Alkaline

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11
Q

Neutral solution is

A

7 / green

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12
Q

Is lemon juice, acidic, alkali or neutral?

A

Acidic

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13
Q

Is salt water, acidic, alkali, or neutral

A

Neutral

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14
Q

Is vinegar ,acidic ,alkali or neutral

A

Acidic

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15
Q

Is window cleaner , acidic, alkali, or neutral

A

Alkali

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16
Q

If you add water to acid, what happens?

A

It dilutes the acid

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17
Q

What is zero on the pH scale?

A

Red

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18
Q

What is purple on the PH scale?

A

Alkaline

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19
Q

What’s 12 on the pH scale?

A

Blue

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20
Q

What is 2 on the PH scale?

A

Orange

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21
Q

What’s 7 on the PH scale?

A

Green

22
Q

A Bee sting can be neutralised by baking soda, so does that mean it’s acidic or alkaline?

A

Acidic

23
Q

A wasp sting can be neutralised by vinegar, so does that mean it’s acidic or alkaline?

A

Alkaline

24
Q

Which acid produces the fastest rate of reaction?
1M 2M 4M

A

4M

25
Q

What is a better reactive marble chip for powder?

A

Powder

26
Q

As you …….. concentration rate of reaction increases

A

Increase

27
Q

As you decrease article size rate of reaction ………

A

Increases

28
Q

As you …….. the temperature rate of reaction increases

A

Increase

29
Q

Complete the fire triangle to show the three things fire needs to burn

A

Oxygen heat fuel

30
Q

If we put a candle in a beaker, what gas is being used up with a beaker is placed or a candle?

A

Oxygen

31
Q

If a beaker is placed over a candle, why does the candle not go out straight away?

A

Who was left over oxygen in the beaker

32
Q

If a candle is placed in a beaker, is it more likely to go out quicker if it’s a small beaker or a big beaker

A

Small beaker

33
Q

If a candle is placed in a beaker, is it more likely to go out slower if it’s a small beaker or a big beaker?

A

Big beaker

34
Q

Wax + oxygen =

A

Carbon dioxide + water

35
Q

Which metal is the most reactive out of magnesium, copper, zinc and iron?

A

Magnesium

36
Q

Which metal is the least reactive out of magnesium, copper, zinc and iron?

A

Copper

37
Q

All metals react at the same speed, True or False?

A

False

38
Q

When a metal is heated in the air it reacts with the nitrogen in the air, True or False?

A

False

39
Q

When a metal reacts with oxygen, a metal oxide is formed, True or False?

A

True

40
Q

Iron produces a bright white light when heated in oxygen, True or False?

A

False

41
Q

Copper reacts quickly when heated with oxygen, True or False?

A

False

42
Q

Name, a group of metals

A

Alkali metals

43
Q

A neutral solution has a pH of about six, rewrite this into a true statement

A

Neutral solution has a pH of seven

44
Q

A liquid with a pH above seven is acidic, rewrite this into a true statement

A

Do you like a PH below seven is acidic

45
Q

Universal indicator goes red in pure water, rewrite this into a true statement

A

Universal indicator goes Green in pure water

46
Q

Alkalis make universal indicator, turn green, rewrite this into a true statement

A

Alkalis make universal indicator, turn blue-purple

47
Q

Acids make universal indicator, turn purple, rewrite this into a true statement

A

I said to make universal indicator turn
red-orange-yellow

48
Q

Strong acids. Have a pH value equal to PH 7, rewrite this into a true statement

A

Strong acids. Have a pH value equal to PH 0

49
Q

What do you need to neutralise stomach acid?

A

A weak alkali

50
Q

Is a strong alkali red on the pH scale

A

No, a strong alkali is purple on a PH scale

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