Topic 5 - Separate Chemistry 1 Flashcards Preview

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Flashcards in Topic 5 - Separate Chemistry 1 Deck (23):
1

Transition Metals properties

Typical metallic properties.

2

Transition Metals as catalysts

Iron is used in the Haber Process for producing ammonia

Vanadium Pentoxide V2O5 is a catalyst for producing Sulfuric Acid.

3

Transition metal compounds are

Colourful.

Eg. Fe2+: orange, Cu2+ Blue,

4

Why are alloys harder than Pure Metals

Different sized atoms disrupt the lattice preventing sliding.

5

Why Iron is alloyed.

Adding carbon makes steel. (1% carbon)
Properties:
Harder, stronger,
More rust resistant

6

Bronze

Copper + Tin
Harder than copper.
Used in metals and decorations.

7

Brass

Copper + Zinc
More malleable than bronze,
Lower friction (water taps and door fittings)

8

Gold alloys

Zinc, copper, silver added to strengthen

Pure Gold: 24 Carat
18 carat: 75%

9

Aluminium alloys

Used in aircraft

Low density
Pure aluminium is not strong enough other metals added.

10

Magnalium

Aluminium + Magnesium (5%)
Stronger, lighter, corrodes less.
Used in cars and aircraft

50% Mg
Used for fireworks

11

Corrosion of Metals

REDOX reactions. Metal is oxidised. (Gains oxygen). Oxygen is reduced (loss)

12

When rusting happens

Oxygen in air and water

13

Prevent rusting : Painting

Coats Iron with a barrier, this keeps out water and oxygen.

14

Sacrificial protection

Placing a more reactive metal on the outside to make the oxygen and water react with it instead

15

Galvanising

A layer of zinc is placed. Acts as a sacrificial protection so it will be oxidised instead of iron

16

Electroplating

Used to coat the surface of metals using electrolysis

17

Cathode in electroplating

The object being electroplated:

18

Electroplating electrolyte

Contains ions of the electroplating metals

19

Use of electroplating

Reduce corrosion or if jewellery used for decoration.

20

Purpose of titrations

To find concentrations, How much acid is needed to neutralise a given quantity of alkali (vise-versa)

21

Burette filled with

Known Concentration.

22

Titrate until

indicator changes

23

Concentration Unit

moles per dm^3 /// g dm^-3