Starter quiz
- What colour does universal indicator turn when a solution is neutral?
- green ✓
- yellow
- blue
- orange
- red
-
- Match the following key terms to their definitions.
- metal oxide⇔metal atoms bonded to oxygen atoms ✓
- non–metal oxide⇔non–metal atoms bonded to oxygen atoms ✓
- adding in excess⇔reactant is present in greater amounts than needed to completely react ✓
- insoluble⇔will not dissolve in a solvent ✓
- The reaction between a metal oxide and an acid is known as a ______ reaction.
- 'neutralisation' ✓
- Match the following chemical names to their symbols.
- sodium⇔Na ✓
- sulfur⇔S ✓
- hydrochloric acid⇔HCl ✓
- metal oxide⇔CuO ✓
- non–metal oxide⇔SO₂ ✓
- Which of the following is the name of the metal salt that is formed when sodium hydroxide reacts with nitric acid?
- sodium nitrate ✓
- sodium nitrogen
- nitric hydroxide
- nitrogen oxide
- sodium nitride
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- Which of the following statements about bases and alkalis are correct?
- An alkali is a base that is soluble in water. ✓
- A base is a substance that can react with acid and neutralise it. ✓
- A base is always insoluble.
- An alkali has a pH of less than 7.
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Exit quiz
- Match the following state symbols to the correct state of matter of a substance in a chemical equation.
- (s)⇔solid ✓
- (l)⇔liquid ✓
- (g)⇔gas ✓
- (aq)⇔dissolved in water ✓
- Sodium hydroxide is an alkali. When it reacts with hydrochloric acid, sodium chloride is formed. Which of the following words can be used to describe sodium chloride?
- element
- compound ✓
- mixture
- base
- metal salt ✓
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- Which of the following is the correct meaning of the state symbol (aq) in a chemical equation?
- It stands for 'aqua' which means water.
- It stands for 'aqueous' which means a substance is dissolved in water. ✓
- It means the same as liquid (l).
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- Which of the following chemicals could be used to neutralise an acid?
- copper oxide ✓
- sodium hydroxide ✓
- sodium chloride
- phosphorus oxide
-
- In a neutralisation reaction, the metal salt produced is named after the metal (base) and the acid used. What is the name and chemical formula of the metal salt formed when nitric acid is used?
- metal nitrate (NO₃) ✓
- metal nitric (HNO₃)
- metal nitrous (N₂O)
- metal nitrogen (N₂)
-
- Use the general equation base + acid → metal salt + water to select the correct chemical equation for the reaction between sodium hydroxide and hydrochloric acid.
- NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O(aq)
- NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O(l) ✓
- NaOH(aq) + HCl(aq) → NaCl(s) + H₂O(l)
- NaOH(aq) + HCl(l) → NaCl(aq) + H₂O(aq)
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Worksheet
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Presentation
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Lesson Details
Key learning points
- Neutralisation reaction general equation is: base + acid → metal salt + water.
- Sodium hydroxide has the formula NaOH(aq) and hydrochloric acid has the formula HCl(aq).
- In a neutralisation reaction, the metal salt formed is named after the metal (from the base) and acid used.
- Common bases include metal oxides and hydroxides.
- (s), (l), (g) and (aq) in chemical equations identify the state of each substance as solid, liquid, gas or in solution.
Common misconception
Pupils often do not understand what neutralisation is i.e. exactly the correct quantities of components from the acid and base combined to form water.
It is worth emphasising that water is formed and it is this which is neutral as it contains the hydrogen and oxygen atoms from the acid and base.
Keywords
Neutralisation - When a chemical reaction takes place between an acid and base to produce a neutral solution of a metal salt and water.
Metal salt - A compound formed when an acid reacts with a base.
Aqueous solution (aq) - Formed when a substance is dissolved in water.
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