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Year 8 in England

7th grade chemical reactions, acids and bases

6 7th grade chemical reactions, acids and bases skills, each with a worked example, free practice that checks every answer, and a printable worksheet. Start with a mixed review, or jump to the skill you need.

Mixed review

Ten questions drawn from every skill below.

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Reactants, products and word equations

CCSS NGSS.MS-PS1-2CCSS NGSS.MS-PS1-5England: KS3 Chemistry: Chemical reactions

Example

Complete the word equation: calcium + oxygen → ___

  1. calcium + oxygen → calcium oxide
  2. So the answer is: calcium oxide

Answer: calcium oxide

Builds on: Physical and chemical changes

Leads to: Neutralisation and naming salts, Exothermic and endothermic reactions, Balancing chemical equations, Combustion, oxidation and the fire triangle

Print a worksheet✏️ Write on screenFlashcards

Acids, alkalis (bases) and the pH scale

CCSS NGSS.MS-PS1-2England: KS3 Chemistry: Chemical reactions (acids and alkalis)

Example

Universal indicator turns red in a solution. What does this tell you?

  1. Red means pH about 0–2: strongly acidic. Green is neutral; purple is strongly alkaline.
  2. So the answer is: It is a strong acid

Answer: It is a strong acid

Builds on: Physical and chemical changes

Leads to: Neutralisation and naming salts, Read indicator colours to find pH, What acids make with metals and carbonates

Print a worksheet✏️ Write on screenFlashcards

Conservation of mass in reactions

CCSS NGSS.MS-PS1-5England: KS3 Chemistry: Chemical reactionsEngland: GCSE Combined Science: Quantitative chemistry

Example

In a sealed flask, 24 g of substance A reacts completely with 20 g of substance B. 8 g of product D forms along with product C. What mass of C forms, in g?

  1. 24 + 20 = 44 g
  2. 44 − 8 = 36
  3. So the answer is: 36 g

Answer: 36 g

Builds on: Conservation of mass, Spot the evidence that a chemical reaction happened

Leads to: Thermal decomposition of carbonates

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Read indicator colours to find pH

CCSS NGSS.MS-PS1-2CCSS NGSS.SEP 4England: KS3 Chemistry: Acids and alkalis

Example

A solution has a pH of 10. What colour will universal indicator turn?

  1. pH 10 is alkaline.
  2. So the answer is: blue

Answer: blue

Builds on: Acids, alkalis (bases) and the pH scale

Leads to: pH and hydrogen ion concentration

Print a worksheet✏️ Write on screenFlashcards

Combustion, oxidation and the fire triangle

CCSS NGSS.MS-PS1-2England: KS3 Chemistry: Chemical reactions

Example

Complete the word equation: calcium + oxygen → ?

  1. metal + oxygen → metal oxide
  2. So the answer is: calcium oxide

Answer: calcium oxide

Builds on: Reactants, products and word equations

Print a worksheet✏️ Write on screenFlashcards

Thermal decomposition of carbonates

CCSS NGSS.MS-PS1-2England: KS3 Chemistry: Chemical reactions

Example

Calcium carbonate is heated strongly and breaks down. What are the products?

  1. metal carbonate → metal oxide + carbon dioxide
  2. So the answer is: calcium oxide + carbon dioxide

Answer: calcium oxide + carbon dioxide

Builds on: Conservation of mass in reactions

Print a worksheet✏️ Write on screenFlashcards

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