AQA GCSE Chemistry Practice Test- Unit 3 Structure and Bonding

Name the step in which a solid turns into a liquid.

Melting

Freezing

Boiling

Sublimation

What is the name of the change in state in which a solid directly turns into a gas without entering the liquid phase?

Melting

Boiling

Sublimation

Freezing

Which group of elements have atoms which can form three covalent bonds?

Group 3

Group 0

Group 2

Group 5

Select two substances below which have simple molecular structures.

Ammonia

Carbon dioxide

Sodium chloride

Graphite

What type of structure does lithium chloride have?

A giant covalent structure

A giant ionic structure

A simple molecular structure

A giant metallic structure

Why does solid lithium chloride not conduct electricity, but molten or dissolved lithium chloride do?

The ions are free to move and so can carry an electric charge when molten or dissolved

When dissolved, electrons become delocalised so they can carry an electric charge

The ions are given heat, so they become free ions so they can carry a charge

Lithium chloride is a simple molecule- it cannot conduct electricity whatsoever

The melting point of graphite is 3652. Predict graphite's state at 25.

Solid

Gas

Liquid

Select the substance below that has covalent bonding.

Silver nitrate

Calcium hydroxide

Carbon dioxide

Potassium permanganate

The ionic charge of a calcium ion is +2, and the charge of a hydroxide ion is -1. What is the empirical formula for calcium hydroxide?

CaOH

Ca2OH

CaH

Ca(OH)2

How large are nanoparticles?

100nm to 2500nm

1nm to 100nm

0.1nm to 1nm

2500nm to 10000nm

What is a fullerene?

A molecule of carbon shaped as a hollow sphere or long and thin tubes

An inorganic chemical compound consisting of just hydrogen and carbon

A substance which consists of only carbon molecules

A giant covalent structure made up of silicon and oxygen

What type of nanocages are being developed for delivering a drug to an area of the human body?

Zinc oxide nanocages

Gold nanocages

Titanium oxide nanocages

Silver nanocages

Why do manufacturers use silver nanoparticles in hiking socks?

The hiking socks look good

To protect from injuries

The silver ions, which are part of the nanoparticles, don't conduct heat

The nanoparticles release a low amount of silver ions to protect against bacteria

Why is a release of nanoparticles into the atmosphere a health hazard?

They can add to the climate change

They can affect many natural reactions

Humans can breathe them in and they can enter the bloodstream

They can infect wounds and injuries

Why can nanotubes be used as lubricants?

They tend to feel slippery

They can slide over each other

They can store lubricant material

AQA GCSE Chemistry Practice Test- Unit 3 Structure and Bonding

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