Build ionic formulae from ion charges
9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.HS-PS1-2 · England: GCSE Combined Science: Bonding, structure and the properties of matter
Name
Date
Score/ 16
Question 1
In Mg(NO₃)₂ (magnesium nitrate), how many nitrate ions are there for each formula unit?
Answer
Question 2
What is the overall charge of any ionic compound?
- A. always positive
- B. the charge of the metal ion
- C. zero
- D. always negative
Question 3
What is the formula of potassium sulfate? (Ions: K⁺ and SO₄²⁻)
- A. K₃SO₄
- B. K₂(SO₄)₂
- C. K₂SO₄
- D. K(SO₄)₂
Question 4
In NaBr (sodium bromide), how many bromide ions are there for each formula unit?
Answer
Question 5
An ionic compound has the formula X₂O₃. What is the charge on the X ion?
- A. 1+
- B. 2+
- C. 6+
- D. 3+
Question 6
What is the formula of lithium sulfate? (Ions: Li⁺ and SO₄²⁻)
- A. Li(SO₄)₂
- B. LiSO₄
- C. Li₂SO₄
- D. Li₃SO₄
Question 7
In MgSO₄ (magnesium sulfate), how many sulfate ions are there for each formula unit?
Answer
Question 8
Why is the formula of calcium hydroxide written Ca(OH)₂ and not CaOH₂?
- A. Calcium has two atoms
- B. CaOH₂ means the same thing
- C. The bracket shows two whole hydroxide ions, each with one O and one H
- D. Brackets show the charge
Question 9
What is the formula of calcium chloride? (Ions: Ca²⁺ and Cl⁻)
- A. CaCl₂
- B. Ca₂Cl
- C. CaCl
- D. Ca₂Cl₂
Question 10
In (NH₄)₂SO₄ (ammonium sulfate), how many ammonium ions are there for each formula unit?
Answer
Question 11
An ionic compound has the formula X₂O₃. What is the charge on the X ion?
- A. 1+
- B. 6+
- C. 3+
- D. 2+
Question 12
What is the formula of potassium chloride? (Ions: K⁺ and Cl⁻)
- A. KCl
- B. KCl₂
- C. K₂Cl
Question 13
In K₂S (potassium sulfide), how many potassium ions are there for each formula unit?
Answer
Question 14
Which compound contains an ion made of more than one atom?
- A. magnesium oxide
- B. sodium bromide
- C. potassium chloride
- D. potassium nitrate
Question 15
What is the formula of potassium carbonate? (Ions: K⁺ and CO₃²⁻)
- A. K₃CO₃
- B. KCO₃
- C. K(CO₃)₂
- D. K₂CO₃
Question 16
In LiOH (lithium hydroxide), how many lithium ions are there for each formula unit?
Answer
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