12. Which elements are combined in the compounds sodium chlorate and magnesium sulfide?
Sodium chlorate
Magnesium sulfide
A
Sodium, chlorine
Magnesium, sulfur, oxygen
B
Sodium, chlorine
Magnesium, sulfur
C
Sodium, chlorine, oxygen
Magnesium, sulfur, oxygen
D
Sodium, chlorine, oxygen
Magnesium, sulfur
13. Which statement best completes the description of ionic bonding?
Ionic bonding is the strong electrostatic attraction between..
A. positive nuclei and electrons and occurs by the sharing of electrons
B. positive nuclei and electrons and occurs by the transfer of electrons
C. positive ions and negative ions and occurs by sharing electrons
D. positive ions and negative ions and occurs by transfer of electrons
14. What is the typical size (order of magnitude) of an atom?
A. 0.1mm
B. 1.0mm
C. 0.1nm
D. 1.0nm
15. Which dot and cross diagram correctly represents the bonding in an oxygen molecule, O2?
16. The diagram shows the outline of part of the Periodic Table:
Which two elements could form a covalent compound?
A. W and X
B. X and V
C. Y and W
D. Z and X
17. The structure of an ionic compound is best described as a lattice structure consisting of a regular arrangement of ..
A. molecules
B. cations and anions
C. atoms
D. cations and electrons
18. Deduce the formulae of magnesium nitrate and magnesium hydroxide given that the formulae for the constituent ions are Mg2+,NO3- and OH- .
Magnesium nitrate
Magnesium hydroxide
A
MgNO3
Mg(OH)2
B
Mg(NO3)2
MgOH2
C
MgNO3
MgOH2
D
Mg(NO3)2
Mg(OH)2
Q19-20: The table below shows some properties of two different substances. Complete the table by selecting the correct type of structure for each substance.
