Question 1 Medium
Name the change of state when ice turns directly into water vapour without becoming a liquid.
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Answer: sublimation
- The solid goes straight to a gas.
- This is sublimation.
Metallic bonding and states of matter: GCSE Combined Science Chemistry practice questions
A second set of questions on metallic bonding and states of matter. They are different from the ones on the topic page. Try each, then open the answer and compare your working.
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Question 2 Medium
Complete the state symbols in 2Mg(s) + O₂(__) → 2MgO(s). Give the missing symbol.
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Answer: (g)
- Oxygen is a gas at room temperature.
- The symbol is (g).
Question 3 Medium
Water melts at 0 °C and boils at 100 °C. What state is water at 120 °C?
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Answer: gas
- 120 °C is above the boiling point of 100 °C.
- So water is a gas.
Question 4 Medium
What word describes a metal that can be drawn into wires?
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Answer: ductile
- Drawing into wires needs the metal to stretch.
- This property is called ductile.
Question 5 Hard
Explain why metals are good conductors of heat.
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Answer: the delocalised electrons carry the energy
- The delocalised electrons are free to move.
- They carry the energy through the metal.
Question 6 Hard
Explain why metals have high melting points.
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Answer: strong attraction between positive ions and delocalised electrons needs a lot of energy to overcome
- There is a strong attraction between the ions and the electrons.
- A lot of energy is needed to overcome it.
Question 7 Hard
Sulfur dioxide melts at −72 °C and boils at −10 °C. What is its state at −40 °C?
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Answer: liquid
- −40 °C is above the melting point of −72 °C.
- −40 °C is below the boiling point of −10 °C.
Question 8 Hard
Give one reason why a diagram of particles as solid spheres is limited for a gas such as steam.
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Answer: it does not show the forces between particles
- It does not show forces.
- Real particles are not hard spheres.
Quick checks
Short questions with options. Choose one before you open the answer.
Check 1
What is metallic bonding?
Show answer
The attraction between positive metal ions and delocalised electrons.
Check 2
Why do metals conduct electricity?
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The delocalised electrons are free to move and carry charge.
Check 3
What does malleable mean?
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Can be hammered or bent into shape.
Check 4
What does ductile mean?
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Can be drawn into wires.
Check 5
Why can metal layers slide?
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The electrons keep the ions bonded as the layers move.
Check 6
How are the particles arranged in a solid?
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Close together in a regular pattern, vibrating in position.
Check 7
How are the particles arranged in a liquid?
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Close together but random, and they can move past each other.
Check 8
How are the particles arranged in a gas?
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Far apart, moving randomly and quickly.
Check 9
What is condensing?
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Gas to liquid.
Check 10
What is sublimation?
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Solid straight to gas.
Check 11
What state is a substance between its melting and boiling points?
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A liquid.
Check 12
What does (aq) mean?
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Dissolved in water.
Check 13
What is overcome when a simple molecular liquid boils?
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The weak intermolecular forces.
Check 14
What do stronger forces between particles mean for the melting point?
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A higher melting point.
Check 15
Give one limitation of the particle model.
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It shows particles as solid spheres and leaves out the forces between them.
Check 16
Is melting a physical or chemical change?
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A physical change.
Check 17
What does delocalised mean for the electrons in a metal?
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Free to move through the whole structure.
Check 18
What is melting?
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Solid to liquid.
Check 19
What is freezing?
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Liquid to solid.
Check 20
What is boiling?
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Liquid to gas.
Check 21
What does the state symbol (g) mean?
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Gas.
Check 22
What does the state symbol (l) mean?
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Liquid.
Check 23
What state is a substance above its boiling point?
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A gas.
Check 24
What state is a substance below its melting point?
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A solid.
Check 25
Which has a fixed shape, a solid or a liquid?
Show answer
A solid.
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