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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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1
Question 1
A flame test gives a green flame. Which metal ion is present?
- A. copper, Cu²⁺
- B. calcium, Ca²⁺
- C. lithium, Li⁺
- D. potassium, K⁺
2
Question 2
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
3
Question 3
Firework makers want a bright green colour. Which compounds should they add?
- A. copper compounds
- B. sodium compounds
- C. potassium compounds
- D. lithium compounds
4
Question 4
A flame test gives a yellow flame. Which metal ion is present?
- A. copper, Cu²⁺
- B. sodium, Na⁺
- C. potassium, K⁺
- D. calcium, Ca²⁺
5
Question 5
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
6
Question 6
What advantage does flame emission spectroscopy have over a flame test by eye?
- A. It works only on gases
- B. It is more sensitive and can measure the concentration of ions
- C. It needs no flame
- D. It is less accurate
7
Question 7
A flame test gives a crimson flame. Which metal ion is present?
- A. copper, Cu²⁺
- B. lithium, Li⁺
- C. potassium, K⁺
- D. sodium, Na⁺
8
Question 8
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
9
Question 9
Firework makers want a bright green colour. Which compounds should they add?
- A. copper compounds
- B. lithium compounds
- C. sodium compounds
- D. potassium compounds
10
Question 10
A flame test gives a yellow flame. Which metal ion is present?
- A. lithium, Li⁺
- B. potassium, K⁺
- C. calcium, Ca²⁺
- D. sodium, Na⁺
11
Question 11
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
12
Question 12
Firework makers want a bright green colour. Which compounds should they add?
- A. copper compounds
- B. sodium compounds
- C. potassium compounds
- D. lithium compounds
13
Question 13
A flame test gives a green flame. Which metal ion is present?
- A. copper, Cu²⁺
- B. potassium, K⁺
- C. lithium, Li⁺
- D. calcium, Ca²⁺
14
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
15
Question 15
What advantage does flame emission spectroscopy have over a flame test by eye?
- A. It is more sensitive and can measure the concentration of ions
- B. It works only on gases
- C. It needs no flame
- D. It is less accurate
16
Question 16
A flame test gives a orange-red flame. Which metal ion is present?
- A. lithium, Li⁺
- B. calcium, Ca²⁺
- C. sodium, Na⁺
- D. potassium, K⁺

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