Ionic, Covalent and Metallic Bonding (1)

Question 1

Explain why this alloy is harder than the pure metal Y

Answer 1

As the particles are different sizes so there are layers to slide

Question 2

What type of substance is an alloy?

Answer 2

Mixture

Question 3

What is the property of substances with small molecules?

Answer 3

Box 1 (Have no overall electric charge)

Question 4

A student produced the salt ammonium nitrate by adding an acid to ammonia solution.
Name the acid used

Answer 4

Nitric acid

Question 5

The solution added is an _______

Answer 5

indicator

Question 6

Why do farmers use ammonium nitrate on their fields?

Answer 6

Fertiliser

Question 7

State one reaction condition that can be changed when making polythene

Answer 7

Temperature

Question 8

Suggest one reason why spoons are electroplated

Answer 8

Improve appearance

Question 9

Why is hydrogen chloride a gas at room temperature (20 degrees celcius)?

Answer 9

Box 1 and Box 3

Question 10

Name a gas produced at the positive electrode

Answer 10

Oxygen

Question 11

Aluminium ions move to the negative electrode. Explain why

Answer 11

As the aluminium ions are positive so are attracted to the negative electrode

Question 12

A nano diamond contains a few ________ atoms

Answer 12

hundred

Question 13

Diamond is made from ________ atoms

Answer 13

Carbon

Question 14

Each atom in diamond is bonded to _______ other atoms

Answer 14

four

Question 15

In silicon dioxide, each silicon atom is bonded with _______ oxygen atoms

Answer 15

four

Question 16

Silicon dioxide is used as the inside layers of furnaces.
Suggest why

Answer 16

As silicon dioxide has a high melting point