Lesson 5.2.2.4
5.2.2.4 Properties of small molecules Quiz: AQA Combined Science, Unit 9
20 questions
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Lesson 5.2.2.4, Properties of small molecules: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 9: Bonding, structure, and the properties of matter, written with Revision Ninja.
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The 20 questions
-
What state of matter are most substances with small molecules at room temperature?
- Dense metals
- Gases or liquids
- Solid crystals
- Giant lattices
-
What type of melting and boiling points do small molecular substances have?
- Extremely high
- Relatively low
- Variable metallic
- Zero
-
The forces between small molecules are:
- Intermolecular forces
- Metallic bonds
- Ionic bonds
- Covalent bonds
-
Which forces are overcome when a small molecular substance melts?
- Covalent bonds
- Metallic bonds
- Ionic bonds
- Intermolecular forces
-
Why do substances consisting of small molecules fail to conduct electricity?
- No overall charge
- Free moving ions
- Strong covalent bonds
- High melting points
-
As molecular size increases, what happens to the intermolecular forces?
- They increase
- They disappear
- They become ionic
- They decrease
-
How do the melting points change for larger molecules?
- They reach zero
- They are higher
- They stay constant
- They are lower
-
Covalent bonds within small molecules are:
- Metallic
- Ionic
- Weak
- Strong
-
Which substance is most likely a gas at room temperature?
- Hydrogen
- Iron
- Sodium chloride
- Diamond
-
Which small molecule has the higher boiling point: methane or decane?
- Both equal
- Neither
- Decane
- Methane
-
What type of force is overcome when solid iodine melts?
- Metallic bonds
- Ionic bonds
- Intermolecular forces
- Covalent bonds
-
Why does pure water conduct electricity poorly?
- Delocalised ions
- Strong bonds
- Neutral molecules
- Free electrons
-
Which is more likely to be solid at room temperature: methane or paraffin wax (large molecules)?
- Both are liquids
- Methane
- Both are gases
- Paraffin wax
-
Why are small molecular substances poor electrical conductors?
- Delocalised electrons
- Free mobile ions
- No free charges
- Weak covalent bonds
-
Why does ethanol boil at a higher temperature than methane?
- Weaker bonds
- Ionic structure
- Smaller mass
- Larger molecules
-
A substance has a boiling point of −40 °C. What state is it at 20 °C?
- Gas
- Metallic
- Liquid
- Solid
-
What forces are broken when small molecular substances melt?
- Covalent bonds
- Ionic bonds
- Metallic bonds
- Intermolecular forces
-
Which list orders boiling points from lowest to highest for H₂, Cl₂ and I₂?
- H₂ < I₂ < Cl₂
- Cl₂ < I₂ < H₂
- H₂ < Cl₂ < I₂
- I₂ < Cl₂ < H₂
-
Why do small molecules not conduct electricity despite containing electrons?
- Electrons are localised
- Electrons are free
- Molecules are charged
- Bonds are weak
-
Why do metals typically have much higher melting points than molecular solids?
- Stronger bonds
- Smaller atoms
- More neutrons
- Weaker ions
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