Chemical Change Flashcards Preview

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Flashcards in Chemical Change Deck (33):
1

In oxidation

Loss of electrons
Often gains oxygen

2

In reduction

Gain if electrons
Often loses oxygen

3

What always occur together

Oxidation and reduction

4

Metals form with oxygen to form

Metal oxides

5

When metals react they

Lose electrons to form positive metal ions

6

The more easily a metal atom loses electrons, the more

Reactive it is

7

Metals react with acids to produce

Metal salt and hydrogen

8

In displacement reactions

A more reactive metal will displace a less reactive metal from a solution of its salt

9

Extraction of metal depends on

How reactive it is

10

When substances dissolve in water they..

Dissociate into their individual ions

11

Hudroxide ions make solutions

Alkaline

12

Hydrogen ions make solutions

Acidic

13

The ph scale is a measure of

The acidity or alkalinity of a aqueous soloution

14

Soliciting with ph 7 is

Neutral

15

Less than PH 7 is

Acidic

16

PH more than 7 are

Alkaline

17

Ph of a solution can be measured using

Universal indicator of ph probe for more accurate

18

Litmus paper

Change from blue or red

19

Solouble bases are called

Alkalis

20

Acids are neutralised by

Bases

21

Acid+ metal hydroxide—->

Salt+water

22

Acids contain

Hydrogen ions

23

Alkalis contain

Hydroxide ions

24

Acid+ metal oxide/—>

Salt+water

25

Acid+ metal carbonate—->

Salt+water+carbon dioxide

26

A salt is produced when

The hydrogen in the acid is replaced by a metal ion

27

Hydrochloric acid produces(salt)

Chloride salts

28

Nitric acid produce(salt)

Nitrate salts

29

Sulfureux acid produces(salt)

Sulfate slats

30

Hydrochloric strong or weak

Strong

31

Ethanoic acid weak/strong

Weak

32

PH of a solution is a measure of the concentration of

H+ ions

33

Cryolite

Lowers the melting point of something
Cheaper