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gcse revision > chemical changes > Flashcards

chemical changes Flashcards

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1
Q

metal oxide

A

a compound formed when a metal ionically bonds with oxygen

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2
Q

reactivity series

A

the order of elements in terms of their reactivity

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3
Q

acid

A

a substance that released H+ ions and has a pH below 7

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4
Q

base

A

a substance that neutralises an acid having a pH above 7

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5
Q

alkali

A

a type of soluble base. a metal hydroxide. Releases OH- ions

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6
Q

neutralisation

A

when an acid reacts with a base to produce a salt and water

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7
Q

carbonates

A

Ionic compounds containing carbon and oxygen

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8
Q

salt

A

ionic compound formed when acid and base reacts

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9
Q

soluble

A

a substance that dissolves

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10
Q

insoluble

A

a substance that doesn’t dissolve

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11
Q

indicator

A

a substance that changes colour when pH changes

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12
Q

electrolysis

A

splitting up an ionic substance using electricity

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13
Q

molten

A

turned into a liquid

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14
Q

solution

A

dissolves in water

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15
Q

suitable indicators for titrations

A

methyl orange ~ acid: red, alkali: yellow
litimus ~ acid : red, alkali : purple

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16
Q

why shouldn’t we use universal indicators for titrations?

A

universal indicators change from colour to colour (a mixture of colours) when doing titrations we want a sudden colour change

17
Q

what do metal and oxygen make?

A

metal + oxygen —> metal oxide

18
Q

what do metal and water make?

A

metal + water —> metal hydroxide + hydrogen

19
Q

what metal and acid make?

A

metal + acid —> salt + hydrogen

20
Q

what does metal carbonate + acid make?

A

metal carbonate + acid —> salt + water + carbon dioxide

21
Q

what does a metal oxide and acid make?

A

metal oxide + acid —> salt + water

22
Q

test for chlorine

A

chlorine bleaches damp litmus paper, turning it white

23
Q

hydrogen test

A

squeaky pop, with a lighted splint

24
Q

test for oxygen

A

oxygen will relight a glowing splint

25
Q

why does the anode need to be continuously replaced?

A

oxygen is produced in the anode which is made of carbon
this carbon reacts with the oxygen to produce carbon dioxide

gcse revision (4 decks)

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