Twenty First Century Science - Chemistry B - J258

7 sections available · 30 chapters available

Free Twenty First Century Science - Chemistry B - J258 revision notes for Cambridge OCR GCSE (9-1) students. Each chapter covers a key topic with worked examples and practice prompts you can take straight into the thinka app.

Air and water

How has the Earth’s atmosphere changed over time, and why?
Why are there temperatures changes in chemical reactions?
What is the evidence for climate change, why is it occurring?
How can scientists help improve the supply of potable water?

Chemical patterns

How have our ideas about atoms developed over time?
What does the Periodic Table tell us about the elements?
How do metals and non-metals combine to form compounds?
How are equations used to represent chemical reactions?
What are the properties of transition metals?

Chemicals of the natural environment

How are the atoms held together in a metal?
How are metals with different reactivities extracted?
What are electrolytes and what happens during electrolysis?
Why is crude oil important as a source of new materials?

Material choices

How is data used to choose a material for a particular use?
What are the different types of polymers?
How do bonding and structure affect properties of materials?
Why are nanoparticles so useful?
What happens to products at the end of their useful life?

Chemical analysis

How are chemicals separated and tested for purity?
How do chemists find the composition of unknown samples?
How are the amounts of substances in reactions calculated?
How are the amounts of chemicals in solution measured?

Making useful chemicals

What useful products can be made from acids?
How do chemists control the rate of reactions?
What factors affect the yield of chemical reactions?
How are chemicals made on an industrial scale?

Ideas about Science

What needs to be considered when investigating a phenomenon scientifically?
What conclusions can we make from data?
How are scientific explanations developed?
How do science and technology impact society? Chapter

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