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Chemistry > Topic 4 > Flashcards

Topic 4 Flashcards

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1
Q

What colour is neutral on pH scale

A

Green

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2
Q

What colours are acids on pH scale

A

More=red
Less=orange

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3
Q

What colour are alkalis on pH scale

A

More = purple
Less = blue

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4
Q

What is a base

A

Any substance that will react with an acid to form a salt

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5
Q

What is an alkali

A

Base that dissolves in water to form a solution with pH greater than 7

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6
Q

What is the reaction of acids and bases called and what’s its reaction

A

Neutralisation

Acid + base - salt + water

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7
Q

When a neutralisation happens

A

The products are neutral

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8
Q

What are titrations

A

Method of finding concentrations of solutions

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9
Q

Difference between strong and weak acids

A

Strong = completely ionise in water

Weak = don’t fully ionise

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10
Q

Acid + metal oxide

A

Salt + water

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11
Q

Acid + metal hydroxide

A

Salt + water

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12
Q

Acid + metal carbonate

A

Salt + water + carbon dioxide

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13
Q

The reactivity series

A

Potassium
Sodium
Lithium
Calcium
Magnesium
Carbon
Zinc
Iron
Hydrogen
Copper

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14
Q

Acid + metal

A

Salt + hydrogen

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15
Q

Metal + water

A

Metal hydroxide + hydrogen

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16
Q

What’s it called when the reaction gains oxygen ( looses electrons )

A

Oxidation

17
Q

What’s its called when the reaction looses oxygen ( gains electrons )

A

Reduction

18
Q

When is a reaction a redox reaction

A

If electrons are transfered

Chemistry (6 decks)

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