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Chemistry µGCSE:

Properties

10 quick questions - for GCSE and iGCSE

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10 minutes maximum! (can you do it in 5?)

 
1. Sodium chloride has a high melting point because it requires a lot of energy to break the …
  • A.  strong bonds between ions.
  • B.  strong bonds between atoms.
  • C.  strong bonds between positive ions and delocalized electrons.
  • D.  weak intermolecular forces between molecules.
Sodium Chloride lattice

2. Which of the following substances could represent the giant covalent substance silicon dioxide?

  Melting Point (oC) Conducts electricity when liquid?
A. -102 no
B. 993 yes
C. 1085 yes
D. 1659 no

 

3. A covalent bond is the …..
  • A.  attraction between oppositely charged ions.
  • B.  attraction of both nuclei for the shared electrons.
  • C.  attraction between positive ions and delocalized electrons.
  • D.  sharing of a pair of electrons.

Q4-6:   Properties of substances P to S are given in the table below:

  Melting Point /oC Electrical Conductivity
solid liquid
P -112 poor poor
Q 680 poor good
R 1610 poor poor
S 660 good good

 

 

4. Which substance has metallic bonding?

5. Which substance has ionic bonding?

6. The substance(s) with a giant structure are ….
  • A.   P only.
  • B.   R only.
  • C.   Q and S only.
  • D.    Q, R and S only.

7. Carbon dioxide has a low melting point. The reason for this is because …..

  • A.    little energy is needed to break the covalent bonds.
  • B.    little energy is needed to break the weak intermolecular forces.
  • C.    it has a small molecular structure which is easily broken into atoms.
  • D.    it is a gas at room temperature.
Carbon dioxide molecule
Jacek FH | CC-BY-SA 3.0
8. Graphite is a good electrical conductor because it has …..
  • A.   a giant covalent structure.
  • B.   a high melting point.
  • C.   delocalized electron.
  • D.   strong covalent bonds between carbon atoms.
9. Diamond is a very hard substance which is used in cutting tools because it has ….
  • A.   strong covalent bonds between atoms which require a large force to break them.
  • B.   strong ionic bonds between ions which require a large force to break them.
  • C.   a shiny appearance and can be used in jewelry.
  • D.   a high melting point.
10. Aqueous or molten ionic substances conduct electricity because they have ….
  • A.   mobile electrons.
  • B.   atoms which are free to move.
  • C.   ions which are free to move.
  • D.   ions arranged in a regular lattice.

 

Salt Flats, Bolivia | otrebskamarta | Pixabay