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chemistry gcse cs frogmore > C4 Chemical Changes FT > Flashcards

C4 Chemical Changes FT Flashcards

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1
Q

What is produced when a metal reacts with oxygen?

A

Metal oxide

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2
Q

What is the name given to the type of reaction when there is addition of oxygen (the metal loses electrons).

A

Oxidation

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3
Q

What is the reactivity series?

A

Order of elements from the most to least reactive.

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4
Q

If a metal is reacted with a compound with a less reactive metal in it what will happen?

A

The more reactive metal will displace the less reactive metal from the compound

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5
Q

Why are some metals more reactive than others?

A

They form positive ions more easily

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6
Q

What is produced when a metal reacts with an acid?

A

A salt

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7
Q

What is a base?

A

A metal oxide or metal hydroxide

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8
Q

What is produced when a metal reacts with an acid?

A

A salt + hydrogen

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9
Q

When is produced when an acid reacts with a base?

A

A salt + water

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10
Q

What is an alkali?

A

A base which dissolves in water (is soluble)

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11
Q

What salt would be made in the reaction between sodium hydroxide and hydrochloric acid?

A

Sodium chloride

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12
Q

What type of salt is made if sulphuric acid is used?

A

A sulphate

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13
Q

What type of salt is made if nitric acid is used?

A

A nitrate

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14
Q

What type of salt is made if hydrochloric acid is used?

A

A chloride

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15
Q

What is made when an acid reacts with a carbonate?

A

A salt + water + carbon dioxide

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16
Q

What is the pH of a strong acid?

A

1

17
Q

What is the pH of a neutral solution?

A

7

18
Q

What ions do acids produce?

A

H+

19
Q

What ions do alkalis produce?

A

OH-

20
Q

Why do ionic compounds have to be dissolved in water or molten for electrolysis?

A

So that the ions can move

21
Q

What is the positive electrode called?

A

Anode

22
Q

What is the negative electrode called?

A

Cathode

23
Q

Why is cryolite added to aluminium oxide to extract aluminium by electrolysis?

A

To lower the melting point and reduce so reduce energy needed

24
Q

Why is the anode constantly replaced in the electrolysis of aluminium oxide?

A

The oxygen reacts with the carbon of the electrode to make carbon dioxide.

25
Q

What 2 ions do water molecules break down into in the electrolysis of aqueous solutions?

A

Hydrogen and hydroxide

26
Q

What moves to the cathode of electrolysis of aqueous solutions?

A

The least reactive positive ion.

27
Q

What moves to the anode of electrolsis of aqueous solutions?

A

If a halide (Gp 7) is present it will go to the anode, if not oxygen will go.

chemistry gcse cs frogmore (11 decks)

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