An Elf is filling helium balloons for Santa’s grotto. Each balloon takes 325cm³ of helium to fill it. How many moles of helium does one balloon contain?

Miss Leonard is trying to make coloured liquids for decorations. She mixes a solution of bromine water with a solution of NaI. She then adds cyclohexane to the solution. What colour would she observe?

Dr Goh receives a crystal kit for Christmas. The kit uses hydrated calcium(II) chloride crystals with the formula CaCl₂. XH₂O. The mass of hydrated salt in the pack is 6.573g. The anhydrous salt weighs 3.33g. What is the value of X in the formula?

Mr Ross has been eating sprouts on Christmas day. Each Sprout eaten creates 0.2 g of methane. How many moles of methane is released by consuming 10 sprouts?

What volume does the methane produced from 10 sprouts (each producing 0.2 g) occupy under standard dining room conditions?

Mr Sankey is trying to keep his Christmas trees healthy in order to sell them. He makes a fertiliser by reacting ammonia with H₃PO₄ . Calculate the %N by mass in the fertiliser. Give your answer to the nearest whole number.

Gold was one of the three gifts given to baby Jesus by the three wise men. Using subshell notation, write out the full electron configuration of gold. Don't worry about using superscripts and use spaces between each subshell. For example, Na would be 1s2 2s2 2p6 3s1

One of the other gifts was frankincense. Frankincense is a mixture of many compounds, including boswellic acid. The structure of one form of boswellic acid is shown. What type(s) of intermolecular force(s) are present in this molecule?

• Van der Waals forces

• permanent dipole-dipole interactions

• hydrogen bonds

• all three of the above

Myrrh was the final gift given to baby Jesus. Myrrh resin is rich in organic compounds. These include the group of naturally occurring organic compounds called the elemenes. $\alpha-elemene$ is shown in the diagram. Would you expect  $\alpha-elemene$  to be optically active?

Dr Naughton receives a bottle of whisky for Christmas. It contains 789 g of ethanol per litre. Dr Naughton drinks 400 cm³ over the festive period. How many moles of CH₃CH₂OH has he consumed?