Chemistry test 14/5/24

Question 1

What is metallic bonding?

Answer 1

electrostatic attraction between positive metal ions and delocalised electrons

Question 2

What are the properties of metals?

Answer 2

solid at room temperature
high melting point
good conductors
malleable

Question 3

Why do metals have a high melting point?

Answer 3

They have a lot of delocalised electrons which hold together giant structure

Question 4

How are metals malleable and ductile?

Answer 4

layers can slide over one another

Question 5

Alloys=

Answer 5

mixture of elements (not chemically combined) containing at least one metal element

Question 6

Are alloys softer or harder than pure metals?

Answer 6

harder

Question 7

Why are alloys useful?

Answer 7

Gives them a combination of properties
Harder
More resistant to rusting

Question 8

What is an example of an alloy and what is it made from?

Answer 8

Steel is an alloy made from iron (99%) and carbon (1%)

Question 9

What does it mean if there are more delocalised electrons?

Answer 9

higher melting point

Question 10

Describe the structure of a giant tetrehedral/ crystalline.

Answer 10

Very hard
Insoluble

Question 11

Describe the structure of a giant covalent.

Answer 11

Layers held together by weak, intermolecular forces
Insoluble