HARD
AS and A Level
IMPORTANT
Earn 100
Methane, , is a gas at room temperature. Explain why methane is a gas at room temperature.
Important Questions on Chemical Bonding
MEDIUM
AS and A Level
IMPORTANT
Draw a diagram to show the shape of a molecule of methane. On your diagram show a value for the bond angle.
MEDIUM
AS and A Level
IMPORTANT
Perfumes often contain molecules that have simple molecular structures. Explain why.
HARD
AS and A Level
IMPORTANT
When a negatively charged rod is held next to a stream of propanone, , the stream of propanone is attracted to the rod. Draw the full structure of a molecule of propanone and use your diagram to explain why the stream of propanone is attracted to the rod.
MEDIUM
AS and A Level
IMPORTANT
Sodium iodide and magnesium oxide are ionic compounds. Iodine and oxygen are covalent molecules. Draw a dot and cross diagram for magnesium oxide.
MEDIUM
AS and A Level
IMPORTANT
Sodium iodide and magnesium oxide are ionic compounds. Iodine and oxygen are covalent molecules. Draw a dot and cross diagram for oxygen.
HARD
AS and A Level
IMPORTANT
Describe how sodium iodide and iodine differ in their solubility in water. Explain your answer.
HARD
AS and A Level
IMPORTANT
Explain why molten sodium iodide is conducting electricity but molten iodine does not.
HARD
AS and A Level
IMPORTANT
The boiling point of sodium iodide is . The boiling point of iodine is . Explain this difference.
