11 mark
The size of a nanoparticle is similar to the size of a molecule. What is the approximate size of a nanoparticle?
0.01 nm
50 nm
1000 nm
10,000 nm
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Properties of Materials (OCR GCSE Chemistry A (Gateway))
Exam Questions
2 hours44 questions21 mark
Which statement about nanoparticulate materials is not correct?
Nanoparticles are much smaller than atoms.
Nanoparticulate materials can be used as catalysts.
Nanoparticulate materials have an extremely large surface area to volume ratio.
There are possible risks when using nanoparticulate materials which are difficult to predict.
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31 mark
Graphite is a form of carbon. Graphite can conduct electricity. Why can graphite conduct electricity?
Delocalised electrons are between layers.
The ions can move.
Layers have weak intermolecular forces.
Strong covalent bonds are between the carbon atoms.
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41 mark
Which of these statements about nanoparticulate materials is correct?
Nanoparticles are much smaller than atoms.
Nanoparticulate materials can be used as catalysts.
Nanoparticulate materials have a very small surface area to volume ratio.
There are no risks when using nanoparticulate materials.
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51 mark
Why can graphite conduct electricity?
Graphite has delocalised electrons
Graphite has layers of atoms that can slide over each other
Graphite has a giant structure
Graphite has strong covalent bonds
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11 mark
Which statement about diamond is correct?
It is a hard substance with a low melting point
Each carbon atom is bonded to three others with strong covalent bonds
It has a giant structure and conducts electricity
It has a high melting point with each carbon bonded to four others
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21 mark
Fullerenes are molecules made of carbon.
Fullerenes are increasingly used as catalysts due to their large surface area.
Give one other use of fullerenes.
Alloys
Lubricants
Polymers
Fuel Cells
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31 mark
The diagram shows the structure of a carbon nanotube.
Which of the following is not a property of carbon nanotubes?
High tensile strength
High melting point
Poor conductor of electricity
Strong covalent bonds
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4
1 mark
1 markParticles are grouped into categories depending on their diameter.
Particle X has a diameter of 2.5 x 10-7 m.
Which particle is this most likely to be?
Coarse particles
Fine particles
Nanoparticles
Dust particles
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51 mark
1 markA nanoparticle of a metal oxide is a cube.
Each side has a length of 82 nm.
What is the volume of the nanoparticle?
6.72 x 103 nm3
5.51 x 105 nm3
5.51 x 10-5 nm3
6.72 x 10-3 nm3
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61 mark
Nanoparticles are used in medicine, and can be used to deliver drugs to the cells where they are needed.
Some people are concerned about using nanoparticles this way.
What is the main reason for this concern?
The potential cost of this technology to the National Health Service
Limited information to patients on which treatments nanoparticles are used for
The unknown effect of nanoparticles on long term health
Money could be spent on other areas of medicine that affect a greater proportion of the population
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71 mark
Different substances have characteristic melting and boiling points, depending on the strength of the bonds or forces holding them together.
Which explains why methane has a lower melting point than sodium chloride?
Covalent bonds are weaker than ionic bonds
Intermolecular forces are weaker than ionic bonds
Covalent bonds are stronger than ionic bonds
Intermolecular forces are stronger than ionic bonds
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81 mark
1 markLook at the table of fractions from the fractional distillation of crude oil.
Fraction | Boiling range (°C) |
LPG | less than 25 |
petrol | 85 – 105 |
diesel | 150 – 290 |
fuel oil | 290 – 380 |
bitumen | greater than 400 |
A hydrocarbon has a boiling point which is 3.5 times the boiling point of petrol. Which fraction contains the hydrocarbon?
Bitumen
Diesel
Fuel oil
LPG
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91 mark
Substance Y melts at −7 °C and boils at 59 °C.
What is the state of substance Y at room temperature?
Gas
Liquid
Plasma
Solid
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101 mark
Ethanol is a liquid at room temperature. It has a low melting point and boiling point.
Why?
Ethanol is an ionic compound.
The forces of attraction between ethanol molecules are strong.
The forces of attraction between ethanol molecules are weak.
There are no forces of attraction between ethanol molecules.
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111 mark
Ammonia has a simple molecular structure.
Which statement explains why ammonia has a low melting point and a low boiling point?
The covalent bonds between the atoms are strong.
The covalent bonds between the atoms are weak.
The intermolecular forces between the molecules are strong.
The intermolecular forces between the molecules are weak.
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121 mark
A student tests the conductivity of an ionic compound. Which row in the table shows the correct results?
| Solid ionic compound | Ionic compound dissolved in water | Molten ionic compound |
A | Conducts | Conducts | Does not conduct |
B | Conducts | Conducts | Conducts |
C | Does not conduct | Does not conduct | Conducts |
D | Does not conduct | Conducts | Conducts |
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131 mark
Carbon can form different allotropes.
Which of these are allotropes of carbon?
Diamond, graphite, graphene.
Diamond, granite, graphite.
Fullerene, graphene, ethene.
Granite, graphite, graphene.
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141 mark
Look at the diagrams.
Which diagram shows a solid with the largest surface area to volume ratio?
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151 mark
What is the approximate size of a nanoparticle?
0.07 nm
0.40 nm
50 nm
1000 nm
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161 mark
The atomic radius of a helium atom is 0.031 nm.
What is the atomic radius of a helium atom in standard form?
3.1 × 10-1
3.1 × 10-2
3.1 × 10-3
3.1 × 10-4
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171 mark
Crude oil can be separated in the laboratory into fractions which have different boiling points.
Look at the table. It shows possible relationships between:
boiling point
number of carbon atoms in the molecule
size of intermolecular forces.
Which letter shows the correct relationship?
| Boiling point | Number of carbon atoms in the molecule | Size of intermolecular forces |
A | high | less than 20 | large |
B | high | more than 50 | small |
C | low | less than 20 | small |
D | low | more than 50 | large |
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181 mark
The melting point of bromine is −7°C.
The boiling point of bromine is 59°C.
What state would bromine be at room temperature?
Aqueous
Gas
Liquid
Solid
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191 mark
Why are nanoparticles useful as catalysts in chemical reactions?
Nanoparticles are a new technology.
Nanoparticles have a high surface area to volume ratio.
Nanoparticles have a large particle size.
Nanoparticles have a low surface area to volume ratio.
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201 mark
The melting point of magnesium chloride is 714°C.
Which state symbols are used for magnesium chloride at these temperatures?
State symbol at 25 oC | State symbol at 110 oC | |
|---|---|---|
A | g | g |
B | s | s |
C | s | g |
D | g | s |
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11 mark
1 markA gold nanoparticle is a cube with sides of 2nm.
What is the simplest surface area to volume ratio of the nanoparticle?
24: 8
12:3
16:1
3:1
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21 mark
Sodium chloride is often known as 'table salt'.
Which compound represents sodium chloride?
| Conducts electricity when solid | Conducts electricity when molten | State at room temperature and pressure | Can be bent or shaped |
A | Yes | Yes | Solid | Yes |
B | No | No | Solid | No |
C | No | Yes | Solid | No |
D | No | No | Solid | Yes |
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31 mark
The diameter of one type of carbon nanotube is 20 nm.
What is 20 nm in metres?
2 × 10-3 m
2 × 10-8 m
2 × 10-20 m
2 × 10-16 m
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41 mark
Carbon dioxide exists as a simple molecule.
Why do simple molecules have low boiling points?
Simple molecules have weak covalent bonds between atoms.
Simple molecules have weak intermolecular forces between atoms.
Simple molecules have weak ionic bonds between the molecules.
Simple molecules have weak intermolecular forces between the molecules.
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51 mark
A carbon nanotube is 1.4 × 10–9 m wide. A human hair is 1.4 × 10–4 m wide.
How many times wider is the hair compared to the nanotube?
100
1000
10000
100000
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61 mark
Which row explains how the structure of graphene is different from the structure of graphite?
| Graphene | Graphite |
A | 3 covalent bonds to each carbon atom | 4 covalent bonds to each carbon atom |
B | covalent bonds in 3D | covalent bonds in one 2D plane |
C | intermolecular forces | no intermolecular forces |
D | one layer | many layers |
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