Starter quiz
- What is the general reaction of an acid with a metal?
- metal + acid → base + water
- metal + acid → salt + hydrogen ✓
- metal + acid → salt + water
- metal + acid → water + hydrogen
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- What is the pH range of acids?
- 0-6 ✓
- 0-7
- 7-14
- 8-14
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- Which ion is found in acidic solutions?
- Cl⁻
- H⁺ ✓
- Na⁺
- OH⁻
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- Which ion is found in alkaline solutions?
- Cl⁻
- H⁺
- K⁺
- OH⁻ ✓
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- What is the difference between a base and an alkali?
- A base is always acidic.
- A base is a solid and an alkali is a liquid.
- An alkali is a base that dissolves in water. ✓
- There is no difference.
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- What is the product when an acid reacts with a base?
- salt and carbon dioxide
- salt and hydrogen
- salt and water ✓
- water and carbon dioxide
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Exit quiz
- What are the products of a reaction between a metal carbonate and an acid?
- hydrogen and oxygen
- salt, water, and carbon dioxide ✓
- salt and hydrogen
- salt and water
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- What is the test for carbon dioxide gas?
- bubbling through limewater turns it cloudy white ✓
- glowing splint relights
- lighted splint makes a 'pop' sound
- limewater turns clear
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- Which compounds have the correct chemical formulae for carbonates?
- CaCO₃, Na₂CO₂, MgCO₃
- CaCO₃, Na₂CO₃, MgCO₃ ✓
- CaCO₃, NaCO₃, Mg(CO₃)₂
- CaCO₄, Na₂CO₄, MgCO₃
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- What is the chemical formula for the metal salt formed when strontium carbonate (SrCO₃) and hydrochloric acid (HCl) react together?
- Sr(HCO₃)₂
- SrCl₂ ✓
- SrCO₃
- SrO
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- What is the correct word equation for the test for carbon dioxide gas?
- carbon dioxide + limewater → calcium bicarbonate + water
- carbon dioxide + limewater → calcium carbonate + water ✓
- carbon dioxide + limewater → calcium carbonate + oxygen
- carbon dioxide + water → carbonic acid
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- What is the correct symbol equation for the test for carbon dioxide gas?
- CO₂ + Ca(HCO₃)₂ → CaCO₃ + H₂O
- CO₂ + CaO → CaCO₃ + O₂
- CO₂ + Ca(OH)₂ → CaCO₃ + H₂O ✓
- CO₂ + H₂O → H₂CO₃
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- metal + acid ⭢ salt + hydrogen; metal carbonate + acid → salt + water + carbon dioxide
- The test for hydrogen gas is to introduce a lighted splint, which will make a squeaky pop in hydrogen.
- The name of a salt formed is dependent on the acid used.
- (s), (l), (g), (aq) in chemical equations identify the state of substances as solid, liquid, gas or in aqueous solution.
- Carbon dioxide can be bubbled through limewater, which turns cloudy (test for CO₂).
Common misconception
Pupils often forget that gases are produced when metals and metal carbonates react with acids.
Emphasise the tests for the gases as a way to remember that they are produced. Writing balanced symbol equations also helps as the pupils can see what elements would be present in the products formed.
Keywords
Balanced equation - This describes a reaction using a symbol equation with coefficients which ensure there are equal numbers of atoms of each element on both sides of the symbol equation.
State symbol - These are used in chemical equations to indicate the physical state of a substance.
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