Identify metal ions with flame tests and precipitates
9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.HS-PS1-2, NGSS.SEP 3 · England: GCSE Chemistry: Chemical analysis (identification of ions)
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Question 1
Why should the wire loop be cleaned in acid before each flame test?
- A. to remove traces of the last compound that could change the colour
- B. to stop the wire melting
- C. to make the flame hotter
- D. to add sodium
Question 2
Sodium hydroxide solution is added to a solution and a brown precipitate forms. Which metal ion is present?
- A. copper(II), Cu²⁺
- B. iron(II), Fe²⁺
- C. iron(III), Fe³⁺
- D. calcium, magnesium or aluminium ions
Question 3
A flame test gives a crimson flame. Which metal ion is present?
- A. sodium, Na⁺
- B. copper, Cu²⁺
- C. lithium, Li⁺
- D. calcium, Ca²⁺
Question 4
Why should the wire loop be cleaned in acid before each flame test?
- A. to make the flame hotter
- B. to add sodium
- C. to remove traces of the last compound that could change the colour
- D. to stop the wire melting
Question 5
Sodium hydroxide solution is added to a solution and a blue precipitate forms. Which metal ion is present?
- A. copper(II), Cu²⁺
- B. iron(II), Fe²⁺
- C. iron(III), Fe³⁺
- D. calcium, magnesium or aluminium ions
Question 6
A flame test gives a green flame. Which metal ion is present?
- A. potassium, K⁺
- B. lithium, Li⁺
- C. copper, Cu²⁺
- D. sodium, Na⁺
Question 7
Why should the wire loop be cleaned in acid before each flame test?
- A. to make the flame hotter
- B. to remove traces of the last compound that could change the colour
- C. to add sodium
- D. to stop the wire melting
Question 8
Sodium hydroxide solution is added to a solution and a white precipitate forms. Which metal ion is present?
- A. copper(II), Cu²⁺
- B. iron(II), Fe²⁺
- C. iron(III), Fe³⁺
- D. calcium, magnesium or aluminium ions
Question 9
A flame test gives a yellow flame. Which metal ion is present?
- A. sodium, Na⁺
- B. calcium, Ca²⁺
- C. lithium, Li⁺
- D. copper, Cu²⁺
Question 10
Why should the wire loop be cleaned in acid before each flame test?
- A. to make the flame hotter
- B. to remove traces of the last compound that could change the colour
- C. to add sodium
- D. to stop the wire melting
Question 11
Sodium hydroxide solution is added to a solution and a green precipitate forms. Which metal ion is present?
- A. copper(II), Cu²⁺
- B. iron(II), Fe²⁺
- C. iron(III), Fe³⁺
- D. calcium, magnesium or aluminium ions
Question 12
A flame test gives a crimson flame. Which metal ion is present?
- A. potassium, K⁺
- B. calcium, Ca²⁺
- C. lithium, Li⁺
- D. sodium, Na⁺
Question 13
Firework makers want a bright green colour. Which compounds should they add?
- A. copper compounds
- B. potassium compounds
- C. sodium compounds
- D. lithium compounds
Question 14
Sodium hydroxide solution is added to a solution and a white precipitate forms. Which metal ion is present?
- A. copper(II), Cu²⁺
- B. iron(II), Fe²⁺
- C. iron(III), Fe³⁺
- D. calcium, magnesium or aluminium ions
Question 15
A flame test gives a lilac flame. Which metal ion is present?
- A. sodium, Na⁺
- B. calcium, Ca²⁺
- C. potassium, K⁺
- D. lithium, Li⁺
Question 16
Firework makers want a bright green colour. Which compounds should they add?
- A. sodium compounds
- B. lithium compounds
- C. potassium compounds
- D. copper compounds
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