Expert Chemistry Tutoring

Q1. Knowledge Recall (1 mark)

What is the name of the technique used to identify metal ions based on the color they produce in a flame?

Q2. Application (2 marks)

Which metal ion produces a purple flame in a flame test?

Q3. Chemical Equation (3 marks)

Write the balanced chemical equation for the reaction between sodium and chlorine to form sodium chloride.

Q4. Knowledge Recall (1 mark)

What is the color of the flame produced by copper ions in a flame test?

Q5. Application (2 marks)

Explain why a blue flame is indicative of the presence of calcium ions.

Q6. Calculation (4 marks)

Calculate the mass of sodium chloride produced when 2.3 g of sodium reacts with excess chlorine. (Relative atomic masses: Na = 23, Cl = 35.5)

Q7. Application (2 marks)

Why is it necessary to use a nichrome wire loop when carrying out a flame test?

Q8. Chemical Equation (3 marks)

Write the balanced chemical equation for the reaction between lithium and oxygen to form lithium oxide.

Q9. Knowledge Recall (1 mark)

Name the metal ion that produces a red flame in a flame test.

Q10. Application (2 marks)

Explain why flame tests are not suitable for identifying all metal ions.