Topic 5 - Separate Chemistry 1

Question 1

Transition Metals properties

Answer 1

Typical metallic properties.

Question 2

Transition Metals as catalysts

Answer 2

Iron is used in the Haber Process for producing ammonia

Vanadium Pentoxide V2O5 is a catalyst for producing Sulfuric Acid.

Question 3

Transition metal compounds are

Answer 3

Colourful.

Eg. Fe2+: orange, Cu2+ Blue,

Question 4

Why are alloys harder than Pure Metals

Answer 4

Different sized atoms disrupt the lattice preventing sliding.

Question 5

Why Iron is alloyed.

Answer 5

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

Question 6

Bronze

Answer 6

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

Question 7

Brass

Answer 7

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

Question 8

Gold alloys

Answer 8

Zinc, copper, silver added to strengthen

Pure Gold: 24 Carat
18 carat: 75%

Question 9

Aluminium alloys

Answer 9

Used in aircraft

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

Question 10

Magnalium

Answer 10

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

50% Mg
Used for fireworks

Question 11

Corrosion of Metals

Answer 11

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

Question 12

When rusting happens

Answer 12

Oxygen in air and water

Question 13

Prevent rusting : Painting

Answer 13

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

Question 14

Sacrificial protection

Answer 14

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

Question 15

Galvanising

Answer 15

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

Question 16

Electroplating

Answer 16

Used to coat the surface of metals using electrolysis

Question 17

Cathode in electroplating

Answer 17

The object being electroplated:

Question 18

Electroplating electrolyte

Answer 18

Contains ions of the electroplating metals

Question 19

Use of electroplating

Answer 19

Reduce corrosion or if jewellery used for decoration.

Question 20

Purpose of titrations

Answer 20

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

Question 21

Burette filled with

Answer 21

Known Concentration.

Question 22

Titrate until

Answer 22

indicator changes

Question 23

Concentration Unit

Answer 23

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