Answer the following seven questions. Question 1
Iron is a ferromagnetic metal used for a wide range of industrial purposes, as well as playing an important biological role. Iron compounds can also exhibit a range of colours. For example, iron(III) chloride usually appears green, while iron(III) hydroxide is orange-brown.
a) Iron(III) chloride is a compound used in sewage treatment and drinking water production.
i. Give the chemical formula for iron(III) chloride. Explain how you determined this formula.
ii. Explain whether iron(III) chloride is an ionic compound or a molecular compound with reference to the electronegativity values of the individual elements.
b) Iron(III) hydroxide is a compound formed during the first stage of the corrosion of iron. The unbalanced chemical equation for this reaction is provided below:
Fe + H2O + O2 → Fe(OH)3
i. Provide a balanced chemical equation for the reaction above, including all physical states.
ii. Describe what you would expect to observe if watching this reaction. Based on the chemical equation above, explain why iron corrosion would be more likely to occur slowly in inland desert areas such as found in Australia.
Draw the Lewis structures of the following compounds:
a) Iron (III) chloride (FeCl3)
b) Silicon tetrafluoride (SiF4)
c) Explain how you determined the electron configurations for the Lewis structures above.
Potash, a white powder of potassium sulfate (K2SO4), is important as a fertilizer, and also in bulk chemical manufacture. It can be reacted with coke (a solid fuel of carbon) to form solid potassium sulfide (K2S) which is used in pyrotechnic effects.
The unbalanced chemical reaction is shown below:
K2SO4 + C à K2S + CO
a) Balance the above chemical reaction and add all physical states.
b) Give the chemical name for the other product formed in this reaction.
c) Chrisjen is carrying out an experiment in the laboratory to produce carbon monoxide. They have 5 moles of potash and 14 moles of coke available.
They conclude that potash must be the limiting reagent as it has the fewer number of moles. Are they correct? Explain why or why not.
Consider the two covalent molecules phosphorous trifluoride (PF3) and carbon tetrafluoride (CF4).
a) Predict the molecular shapes of PF3 and CF4, explaining your answer with reference to electron domains.
b) Which of the two compounds above (PF3 or CF4) would you expect to have a lower boiling point? Explain your answer.
a) Draw the line structures of the compounds listed below
b) Give the IUPAC names of the compounds represented below:
c) Which of the compounds from Question 5b) would you expect to be soluble in hexane? Explain your answer.
The structure shown below is that of a fluorescent dye used as a stain for microscopy.
a) Circle and name three different functional groups in the structure below.
b) Would you expect this dye molecule to have enantiomers? Explain your answer with reference to chiral carbon atoms.
a) Draw the two geometric isomers of 1,2-dichlorocyclohexane, labelling each structure with its full correct name.
b) Explain why geometric isomers would not be possible for 1,2-dichlorohexane.
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