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
An ionic compound has the formula X₂O₃. What is the charge on the X ion?
- A. 3+
- B. 2+
- C. 6+
- D. 1+
Question 2
What is the formula of magnesium sulfide? (Ions: Mg²⁺ and S²⁻)
- A. MgS
- B. Mg₂S
- C. MgS₂
Question 3
In CaO (calcium oxide), how many calcium ions are there for each formula unit?
Answer
Question 4
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. Brackets show the charge
- D. The bracket shows two whole hydroxide ions, each with one O and one H
Question 5
What is the formula of magnesium sulfide? (Ions: Mg²⁺ and S²⁻)
- A. MgS₂
- B. Mg₂S
- C. MgS
Question 6
In KCl (potassium chloride), how many chloride ions are there for each formula unit?
Answer
Question 7
An ionic compound has the formula X₂O₃. What is the charge on the X ion?
- A. 3+
- B. 2+
- C. 6+
- D. 1+
Question 8
What is the formula of ammonium carbonate? (Ions: NH₄⁺ and CO₃²⁻)
- A. NH₄(CO₃)₂
- B. NH₄CO₃
- C. (NH₄)₂CO₃
- D. (NH₄)₂(CO₃)₂
Question 9
In Na₂CO₃ (sodium carbonate), how many sodium ions are there for each formula unit?
Answer
Question 10
What is the overall charge of any ionic compound?
- A. the charge of the metal ion
- B. zero
- C. always negative
- D. always positive
Question 11
What is the formula of potassium carbonate? (Ions: K⁺ and CO₃²⁻)
- A. KCO₃
- B. K₂(CO₃)₂
- C. K(CO₃)₂
- D. K₂CO₃
Question 12
In NH₄Cl (ammonium chloride), how many ammonium ions are there for each formula unit?
Answer
Question 13
An ionic compound has the formula X₂O₃. What is the charge on the X ion?
- A. 6+
- B. 1+
- C. 3+
- D. 2+
Question 14
What is the formula of sodium oxide? (Ions: Na⁺ and O²⁻)
- A. NaO
- B. Na₃O
- C. NaO₂
- D. Na₂O
Question 15
In KNO₃ (potassium nitrate), how many nitrate ions are there for each formula unit?
Answer
Question 16
Which compound contains an ion made of more than one atom?
- A. potassium nitrate
- B. sodium bromide
- C. magnesium oxide
- D. potassium chloride
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