Starter quiz
- What is required for an atom to become an ion?
- Change in atomic mass.
- Loss or gain of electrons. ✓
- Loss or gain of protons.
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- What is the charge on a cation?
- Negative
- Neutral
- Positive ✓
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- What happens to ionic compounds when they dissolve in water?
- They dissociate into their constituent ions. ✓
- They form atoms.
- They remain as molecules.
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- How do you balance a chemical equation?
- Ensure the same number of each type of atom on both sides. ✓
- Equal charges on both sides.
- Equal masses on both sides.
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- What is the charge on a chloride ion?
- Negative ✓
- Neutral
- Positive
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- Which of the following is a common cation?
- Ca²⁺ ✓
- Cl⁻
- SO₄²⁻
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Exit quiz
- What is a spectator ion?
- An ion that does not participate in the chemical reaction and remains unchanged. ✓
- An ion that forms a precipitate.
- An ion that participates in the reaction and changes.
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- What must be conserved in a balanced ionic equation?
- Mass and charge ✓
- Temperature and concentration
- Volume and pressure
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- What is the first step in writing an ionic equation?
- Balance the equation.
- Identify spectator ions.
- Write the molecular equation. ✓
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- What is the net ionic equation for the reaction: BaCl₂(aq) + Na₂SO₄(aq) → BaSO₄(s) + NaCl(aq)
- Ba²⁺(aq) + 2Na⁺(aq) → BaNa₂(aq)
- Ba²⁺(aq) + SO₄²⁻(aq) → BaSO₄(s) ✓
- BaCl₂(aq) + Na₂SO₄(aq) → BaSO₄(s) + 2NaCl(aq)
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- What is the net ionic equation for the reaction: AgNO₃(aq) + NaCl(aq) → AgCl(s) + NaNO₃(aq)
- Ag⁺(aq) + Cl⁻(aq) → AgCl(s) ✓
- Ag⁺(aq) + NO₃⁻(aq) → AgNO₃(s)
- 2AgNO₃(aq) + 2NaCl(aq) → 2AgCl(s) + 2NaNO₃(aq)
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- What must be included when balancing ionic equations?
- Catalysts
- State symbols (s, l, g, aq) ✓
- Temperatures
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Worksheet
Presentation
Video
Lesson Details
Key learning points
- An ionic equation represents the reaction between positive and negative ions.
- The electric charge on each side of an ionic equation adds up to zero.
- (s), (l), (g) and (aq) in ionic equations identify the state of each substance as solid, liquid, gas or in solution
Common misconception
All ionic compounds dissociate completely in aqueous solutions.
Not all ionic compounds dissociate completely in water; some may not dissolve at all. It's important to know the solubility rules to correctly predict the behaviour of compounds in solution.
Keywords
Ion - A charged particle formed when an atom or molecule gains or loses electrons.
Ionic equation - An equation that shows only the ions and molecules directly involved in a chemical reaction, excluding spectator ions.
Spectator ion - An ion that remains unchanged during a chemical reaction and does not participate in the formation of the product.
Chemical species - Any chemical entity, such as atoms, ions, or molecules involved in a chemical process.
False positive - An incorrect test result indicating the presence of a substance or condition that is actually absent.