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C2 reactions > Chemical reactions > Flashcards

Chemical reactions Flashcards

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Organic Chemistry 101 flashcards
1
Q

What colour would a strong alkali turn using universal indicator

A

Purple

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2
Q

What is the difference between a chemical and physical change

A

Chemical changes are not reversible but physical changes are

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3
Q

What is an acid

A

A substance with a pH lower than 7

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4
Q

Give an example of an acid with a pH of 1-2

A

HCL/ stomach acid

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5
Q

What hazard might an acid pose

A

It might be corrosive

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6
Q

What is an indicator

A

A dye that changes colour depending what pH a liquid is

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7
Q

What is an alkali

A

A water soluble base

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8
Q

What is a base

A

A substance with a pH over 7

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9
Q

What is a neutral substance

A

Water

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10
Q

What hazard might an alkali pose

A

It might be irritant

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11
Q

Is ice melting a chemical change? Why?

A

No, you can freeze it back into its original shape

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12
Q

Is food being burnt a chemical change? Why?

A

Yes, the particles have changed and cannot be restored.

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13
Q

What pH is lemon juice

A

2.4

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14
Q

What colour would litmus turn a strong alkali

A

Blue

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15
Q

Is litmus or universal more effective

A

Universal

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16
Q

What colour would a weak acid turn in universal indicator

A

Orange or yellow

17
Q

What does the pH scale measure

A

How acidic or alkaine a substance is

18
Q

What is sodium oxide + nitric acid

A

Sodium nitrate+ water

19
Q

What is copper hydroxide + sulphuric acid

A

Copper sulphate+ water

20
Q

What is neutralisation

A

An acid and alkali mixing to a substance with a pH of 7

21
Q

How do you neutralise a base

A

With acid

22
Q

What is also produced with water in neutralisation

A

Salt

23
Q

What makes copper nitrate+ water

A

Copper oxide+ nitric acid

24
Q

What makes magnesium citrate

A

Citric acid+ magnesium hydroxide

25
Q

What’s the control variable

A

The one you keep the same

26
Q

What’s the independent variable

A

The one you change

27
Q

What’s the dependent variable

A

The one you measure

C2 reactions (2 decks)

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