- Chemical bonding- Determine electronic configuration
- Drawing dot and cross diagrams (showing all electrons)- Drawing dot and cross diagrams (showing outermost electrons)- Formulae of ionic compounds- Formulae of covalent molecules
- Ionic compounds and molecules
The total score for this test is 10 marks. You should complete the test in 10 minutes.
Section A: Multiple Choice (5 marks)1. A compound X contains bromine and one other element.
Which property of X indicates that the bonds in X are ionic?A. It conducts electricity when molten.B. It does not conduct electricity in the solid state.C. It is insoluble in water.D. It is gaseous at room temperature.2. Which solid does not contain covalent bonds?A. graphiteB. iodineC. calcium carbonateD. copper3. Which of the following ions have the same number of electrons as neon atom, which has an atomic number of 10.
A. sodiumB. lithium
C. chloride
D. bromide
4. In which molecules are all the outer electrons of the atoms involved in bonding?
A. HClB. C2H4
C. H2O
D. F2
5. The following shows the structure of a molecule, which is made up of elements Y and Z.
Which of the following could X and Y be?
element Y element Z
A chlorine nitrogen
B hydrogen phosphorus
C sodium nitrogen
D lithium phosphorus
Section B: Open- ended questions (5 marks)1. Particle Z has 17 protons, 18 electrons and 18 neutrons.
i) Is particle Z a positive or negative ion?
ii) Which group in the Periodic Table does element Z belong to?
iii) Predict the type of bonding particle Z forms with sodium.
iv) Suggest the formula of the compound formed between an atom of Z and carbon.
v) By means of a dot- and- cross diagram, draw the structure of the compound formed between atom(s) Z and carbon. Show only the valence electrons.
Answers
1) A
2) D
3) A
4) B
5) B
Section B:
1 i) negative ion
ii) Group VII
iii) ionic bonding
iv) CZ4
v)
