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Yr9 Chemistery > Chemical changes > Flashcards

Chemical changes Flashcards

1
Q

Metal+Oxygen–>

A

Metal oxide

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2
Q

Metal+Acid–>

A

Salt( compound name)+Hydrogen

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3
Q

Acid+ Carbonate–>

A

Salt+ Water+ Carbon Dioxide

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4
Q

Acid+ Metal Oxide–>

A

Salt+ Water

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5
Q

Acid+Hydroxide–>

A

Salt+ Water

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6
Q

Metal+Non- Metal

A

Metal Non- Metallide

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7
Q

Element+ Oxygen

A

Element oxide

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8
Q

Oxidation

A

Gaining of oxygen or gaining of a element

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9
Q

Reduction

A

If you loose a electron the element has been reduced

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10
Q

Reactivity series

A

How reactive are element in order

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11
Q

Reactivity series name em

A 
Potassium
Sodium
Lithium
Calcium
Magnesium
Zinc
Iron
Copper
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12
Q

Which elements react rapidly with water

A

Potassium
Sodium
Lithium

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13
Q

Reacts quite rapidly element

A

Calcium

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14
Q

No reaction with water elements

A

MAGNESIUM
Zinc
Iron
Copper

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15
Q

What makes a metal more reactive than other metals

A

When a metal reacts they lose electrons form positive ions

Reactivity of a metal depends on the ability to lose electrons and become positive ions

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16
Q

Which elements can be found in the earth as itself

A

Unreactive metals like platinum, gold and silver

This is because they don’t lose electrons that easily to become ions

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17
Q

A more reactive element will replace

A

A less reactive element in a compound

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18
Q

Ionic equations explain what…

A

what happens to each of the reactants during reactions

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19
Q

Reactions between metal and acids …

A

redox reactions. This displaces hydrogen as a gas while the metal ions are left in the solution.

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20
Q

salt from hydrochloric acid

A

chloride

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21
Q

salt from sulfuric acid

A

sulfate

22
Q

salt from nitrate acid

A

nitrate

23
Q

A base … an acid

A

neutralizes

24
Q

reduction

A

when oxygen is removed or electrons are gained

25
Q

oxidisation

A

when oxygen is gained and electrons are lost

26
Q

Group 1 metal reaction with water

A

reactions get more vigorous as you go down the group

27
Q

Group 2 metals react with water

A

Do not react with water

28
Q

Zinc, iron, copper reaction with water

A

Do not react with water

29
Q

Group 1 metal reaction with acid

A

reactions get more vigorous as you go down the group

30
Q

group 2 metal reaction with acid

A

Observable reactions including fizzing and temperature increases

31
Q

Zinc, iron, copper reaction with acid

A

Zinc and iron react slowly with acid. Copper does not react with acid

32
Q

The reactivity of a metal…

A

refers to a tendency to form positive ions

33
Q

why are copper and hydrogen in the reactivity series if they are non-metals

A

they can be used to extract some metal from their ores, depending on their reactivity

34
Q

A more reactive element will… a less reactive element

A

displace

35
Q

What will happen at the negative electrode in an aqueous solution

A

Metal will be produced on the negative electrode if the metal s less reactive than hydrogen if the metal more reactive hydrogen will be produced

36
Q

What will happen at the positive elctrode in an aqueous solution

A

Oxygen is formed at the positive electrode unless it is haline( Chlorine, Iodine, Bromine)

37
Q

Process of electrolosys

A

When an ionic compound is melted or dissolved in an aqueous solution, the ions are free to move. These are then able to conduct electricity and are called electrolytes. Passing an electric current through electrolytes causes the ions to move to the elcetrodes

38
Q

Anode

A

Potitive electrode

39
Q

Cathdoe

A

Negative electrode

40
Q

Cations

A

positive ions that move to the negative cathode

41
Q

Anions

A

Negative ions that move to the positive cathode

42
Q

When is electrolysis used with molten compounds

A

When metal is too reactive to be extracted by reduction with carbon

43
Q

What is titration useful for

A

To measure the precise volumes of acid and alkalis that react with each other

44
Q

Titration method

A

1) Use the pipette to add 25 cm cubed of alkali to a conical flask and add a few drops of the indicator
2) Fill the burette with acid and note the starting volume Slowly add the acid from the burette to the alkali in the conical flask, swirling to mix
3) Stop adding the acid when the end-point is reached(the appropriate colour change in the indicator happens). Note the final volume reading. Repeat steps 1 to 3 until you get consistent readings.

45
Q

Strong acid

A

Fully ionises in aqueous solutions

46
Q

Weak acids

A

Only partially ionises in aqueous solution

47
Q

The hydrogen concentration in acids

A

As the ph decreases by a unit ( becoming more acidic) the concentration of hydrogen increases *10

48
Q

Soluble salts

A

Can be made from reacting on acid and insoluble substances like a metal

49
Q

Production os soluble salts

A

Add the solid to the acid until no more dissolves. Filter of excess solid and then crystallise to produce solid salts.

50
Q

What does acid produce in aqueous solutions

A

Hydrogen ions

51
Q

What does alkalis produce in aqueous solutions

A

Hydroxide ions

Yr9 Chemistery (6 decks)

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