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Why is chlorine more reactive than iodine? (3 marks)

3 marks so 3 points = chlorine's outer electrons are closer to the nucleus than iodine's (because chlorine has fewer shells)//so chlorine's nucleus is more attracted to its outer electrons than iodine's nucl...
SR
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Calculate the relative formula mass of Iron(III) Oxide (Fe2O3)

Iron (III) / Fe3+ Mr = 56Oxygen / O Mr = 16 Iron (III) Oxide formula = Fe2O3 2x Iron (III) = 56 * 2 = 1123x Oxygen = 16 * 3 = 48 48 + 112 = 160 Fe2O3 relative formula mass = 160
RC
Answered by Rob C. • Chemistry tutor
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Describe the process of Fractional Distillation

Crude oil heated and fed into the bottom of the fractionating column as a vapour. The column is cooler at the top and hotter at the bottom of the column. The process works using the different boiling and con...
LD
Answered by Lauren D. • Chemistry tutor
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What are covalent and Ionic bonds and how do they differ?

Covalent bonds are formed as a result of the sharing of pairs of electrons between atoms in order to attain a full outer shell. This typically will happen between two non metals. An ionic bond has the same a...
BS
Answered by Ben S. • Chemistry tutor
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A reaction can take place between an acid and an alkali: a) Name this type of reaction. (1 mark) b) Write a word equation that shows the reaction between nitric acid and potassium hydroxide. (1 mark) c) Write the symbolic equation (1 mark)

Answer Answer outline and marking scheme for question: 2 a) Neutralisation. (1 mark) b) nitric acid + potassium hydroxide → potassium nitrate + water(Mark is gained for writing potassium nitrate as the salt)...
SC
Answered by satvir c. • Chemistry tutor
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