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chemistry > C4 > Flashcards

C4 Flashcards

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1
Q

is a strong acid the same as a concentrated acid

A

no
strength = proportion of molecules to ionise in water
conc = how much acid in a given volume

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2
Q

acid + metal hydroxide =

A

salt + water

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3
Q

acid + metal carbonate =

A

carbon dioxide + water + salt

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4
Q

if less reactive than carbon metals can be extracted by

A

reduction

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5
Q

more reactive than hydrogen

A

reacts with acids

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6
Q

acid + metal =

A

salt + hydrogen

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7
Q

metal + water =

A

metal hydroxide + hydrogen

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8
Q

formation of ore

A

oxidation

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9
Q

extraction of ore

A

reduction

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10
Q

electrolyte

A

molten or dissolved ionic compound

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11
Q

positive ions are…

A

reduced to gain electrons

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12
Q

negative ions are…

A

oxidised to lose electrons

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13
Q

why can’t solids be electrolysed

A

ions are in a fixed position

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14
Q

aqueous solution cathode contents

A

H+ ions if more reactive

less reactive = layer of pure metal

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15
Q

aqueous solution anode contents

A

OH if present or oxygen and water

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16
Q

metal displacement is a ____ reaction

A

redox

17
Q

what does cryolite do

A

lowers boiling temp

18
Q

acids and bases _____ each other

A

neutralise

19
Q

an acid is…

A

an aqueous solution with pH less than 7

20
Q

a base is…

A

one that will react with an acid to form a salt

21
Q

acids produce ______ in water

A

protons

22
Q

a strong acid…

A

ionises completely in water

dissociâtes to release H+

23
Q

weak acids…

A

do not fully ionise

24
Q

a pH is a measure of

A

H+ ions in the solution

25
Q

decrease pH by 1

A

increase H+ by x10

26
Q

if halogen is present then

A

it’s produced

27
Q

if a sulphate is present

A

oxygen is produced

28
Q

is metal less reactive than H

A

produced

29
Q

if metal more reactive than H

A

hydrogen is produced

chemistry (10 decks)

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