Tier
Chemistry Year 8 Grade Descriptors
New
Grade
C4 – Acids and Alkalis
Fully explain exo and endothermic reactions using graphical representation, using ideas of bonds.
Predict the salts made or acids/alkalis required and write balanced symbol equations for neutralisation.
Write balanced symbol equations for the reactants and products in metal–acid reactions.
9
Higher
8
7
C5 – Everyday chemistry
Explain the changes of the Earth’s atmosphere over time.
Explain the link between combustion and the production of carbon dioxide (and other oxides) including the word and symbol equations for combustion of fuels.
Explain in detail how the carbon cycle is kept in balance.
Evaluate benefits and drawbacks of biofuels.
Explain common pollutants, how they are produced and their negative effects using statistics.
Evaluate the advantages and disadvantages of polymers.
C4 – Acids and Alkalis
Write symbol equations for the reactants and products in metal-acid reactions.
Explain exo- and endo-thermic reaction using graphical representation
Predict the salts made or acids/alkalis required and write symbol equations for neutralisation.
Analyse graphical data on acid rain statistics.
C5 – Everyday chemistry
Explain how the carbon cycle is kept in balance.
Explain the advantages and disadvantage of biofuels
Use energy transfer diagrams to explain the efficiency of certain objects.
Discuss the advantages and disadvantages of polymers.
Explain in detail how greenhouse gases are leading to global warming.
Describe the link between combustion and the production of carbon dioxide including the word equation for combustion
C4 – Acids and Alkalis
Describe in detail the difference between exothermic and endothermic reactions regarding energies
Describe in detail the composition and evolution of the Earth’s atmosphere
Predict the salts made or acids/alkalis required.
Explain the effect of acid rain on lakes rivers, rocks and buildings.
Explain how antacids relieve indigestion using knowledge of neutralisation.
C5 – Everyday chemistry
Explain how GHG’s are contributing to global warming
Describe how biofuels are made and used.
Describe in detail features on a house that either use sustainable materials, save energy or reduce waste.
Describe how properties of hydrocarbons changes with chain length
C4 – Acids and Alkalis
Describe in detail the difference between exothermic and endothermic reactions giving examples
Correctly write word equations for different neutralisation reactions
Carry out an investigation into the neutralisation of stomach acid
Write word equations for the reactants and products in metal-acid reactions.
6
Middle
5
C5 – Everyday chemistry
Simply explain how GHG’s contribute to global warming
Describe the composition and evolution of the Earth’s atmosphere
Write the word equations for combustion of specific fuels.
Describe in detail the structure and uses of polymers
Basically describe how different size hydrocarbons are recovered from crude oil.
State differences between alkenes and alkanes
C4 – Acids and Alkalis
Compare different acids and conclude which is the most dangerous.
Accurately describe what exothermic and endothermic reactions are and give an example
Identify the salts produced by different acids and be able to write different word equations.
Describe how antacids relieve indigestion.
Explain how values on the pH scale relate to indicator colour and acidity
Describe the differences between using UI and litmus paper to test acids and alkalis
Describe what causes acid rain.
C5 – Everyday chemistry
Describe the evolution of the Earth’s atmosphere
Write the word equation for the combustion of fuels.
Describe how the carbon cycle is kept in balance and name reactions involved
Describe common pollutants, their sources and negative effects.
Describe what biofuels are.
Describe features on a house that either use sustainable materials, save energy or reduce waste.
Describe the structure and uses of polymers.
Describe how crude oil is extracted
C4 – Acids and Alkalis
4
3
Lower
2
Describe how acids can be used safely, and explain the precautions taken when using them.
Describe simply how antacids relieve indigestion.
Describe the products of metal compound reactions.
Basically describe what types of pollution can contribute to acid rain.
Describe the difference between exothermic and endothermic reactions
C5 – Everyday chemistry
Describe how we know that levels of carbon dioxide in the atmosphere have increased.
Clearly describe the affect gases have on our environment
Describe complete and incomplete combustion
Draw and describe the key parts of the carbon cycle
Describe how oil is running out and explain why it is a finite resource.
Basically describe the structure of polymers
Basically describe how crude oil is extracted
C4 – Acids and Alkalis
Describe some hazards of using acids
Basically describe what exothermic and endothermic reactions are
Give examples of common acids and alkalis and correctly classify them on the pH scale.
Describe neutralisation using the word equation
Simply state that acid rain is caused by pollution.
Simply describe indigestion of stomach is due to excess acid and can be treated by antacids.
Identify the products of a reaction between acids and metals
C5 – Everyday chemistry
Describe the effect gases have on our environment
Identify what combustion is.
State what ‘carbon neutral’ means and recall how carbon is ‘recycled’ naturally in the carbon cycle.
Describe what finite resources are.
Identify features on a house that either use sustainable materials, save energy or reduce waste.
Give examples of polymers and their properties.
C4 – Acids and Alkalis
Simply state what exothermic and endothermic reactions are when things get hot and cold
Give examples of common acids
Simply describe neutralisation
Simply describe indigestion of stomach is due to excess acid.
Simply state how UI and litmus paper are used to test acids and alkalis
Identify some of the consequences of acid rain.
Identify which types of metal compounds react with acids.
C5 – Everyday chemistry
State the main gases harming the environment
Simply state a polymer is made from repeated units
Simply state that crude oil is made from hydrocarbons
C4 – Acids and Alkalis
Simply identify acids and alkalis on a pH scale
1
C5 – Everyday chemistry
State that some gases are ‘bad’ for our environment
Identify what crude oil is.