EOY 12 Chemistry Exam Questions

Question 1

Define the term relative atomic mass. ( 2 marks)

Answer 1

Average mass of an atom compared to 1/12 the mass of a C atom.

Question 2

Deduce which of Na+ and Mg2+ is the smaller ion. (2 marks)

Answer 2

Smaller ion: Mg2+
Explanation: Same energy levels however Mg2+ has a greater nuclear charge .

Question 3

State one observation when magnesium reacts with steam. (1 mark)

Answer 3

White powder, bright light.

Question 5

Define the term standard enthalpy of formation. (2 marks)

Answer 5

The enthalpy change when 1 mole of compound is formed with all reactants & products under standard state conditions from its elements.

Question 6

Define the term electronegativity.

Answer 6

The power an atom has to draw 2 electron in a covalent bond.

Question 7

State the meaning of the term fraction.

Answer 7

A mixture with similar boiling points.

Question 8

State what is meant by the term Carbon-Neutral.

Answer 8

The same amount of CO2 is taken in & released into atmosphere.

Question 9

What is the role of hydroxide ions in the elimination reaction?

Answer 9

Electrophile