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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
The elements in Group 1 form...
-2 ions
+1 ions
-1 ions
They don't form ions
Which group of elements form -2 ions?
Group 2
Group 1
Group 6
Group 0
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
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