Overview of Cambridge IGCSE Chemistry 0620 Syllabus

A student is asked to separate a mixture of sand, salt, and iron filings. Which sequence of experimental techniques would most effectively separate all three components? Correct answer: Use a magnet to remove iron filings, add water to dissolve salt, filter to separate sand, then evaporate water to recover salt.

Which of the following best explains why ionic compounds generally have high melting points? Correct answer: The ions are held together by strong electrostatic forces in a giant lattice.

A 0.5 mol sample of NaCl is dissolved in enough water to make 250 cm³ of solution. What is the concentration of the solution in mol/dm³? Correct answer: 2.0 mol/dm³