Help to anyone who's making an unofficial mark scheme, some of the questions and marks given may not be right though:
1a) Define relative isotopic mass. (2)
1b) Fill the table in for the atomic structure of a potassium atom and ion. (3)
1c) How many molecules are in 6.(something)g of SiCl4? (3)
1d) Draw the symbols for each particle shown in the ionic lattice structure of KCl. (2)
A few other random questions I remember:
- Describe the reactivity of the group 2 metals with chlorine as you descend the group. (5)
- A precipitation reaction was used to identify the iodide present in Potassium Iodide. State the reagent used for this reaction (1)
- Write the ionic equation to show the reaction between this reagent and the Iodide ion. (1)
- A mixture of potassium iodide and bromine was present in a solution. What solvent can be used to identify the presence of iodide in this solution? (1)
- A student suggested the bond angles in H-N-H would be larger in NH3BF3 than NH3, suggest why. (3 marker I think)
- What bond angles are present in the F-B-F in: i) BF3 ii) NH3BF3 (2)
- Phosphene gas reacts with oxygen to form P4010 and water. Write out the equation for this reaction. (1)
- Why does PH3 have a lower boiling point than NH3? (1)
- Why is N2SO4 described as a salt? (1)