Twenty First Century Science - Combined Science B - J260

18 sections available · 66 chapters available

Free Twenty First Century Science - Combined Science B - J260 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.

You and your genes

What is the genome and what does it do?
How is genetic information inherited?
How can and should gene technology be used?

Keeping healthy

What are the causes of disease?
How do organisms protect themselves against pathogens?
How can we prevent the spread of infection?
How can lifestyle, genes and the environment affect my health?
How can we treat disease?

Living together – food and ecosystems

What happens during photosynthesis?
How do producers get the substances they need?
How are organisms in an ecosystem interdependent?
How are populations affected by conditions in an ecosystem?

Using food and controlling growth

What happens during cellular respiration?
How do we know about mitochondria and other cell structures?
How do organisms grow and develop?
Should we use stem cells to treat damage and disease?

The human body – staying alive

How do substances get into, out of and around our bodies?
How does the nervous system help us respond to changes?
How do hormones control responses in the human body?
Why do we need to maintain a constant internal environment?
What role do hormones play in human reproduction?
What can happen when organs and control systems stop working?

Life on Earth – past, present and future

How was the theory of evolution developed?
How does our understanding of biology help us classify the diversity of organisms on Earth?
How is biodiversity threatened and how can we protect it?

Air and water

How has the Earth’s atmosphere changed over time, and why?
Why are there temperature 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?

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?
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 are the amounts of substances in reactions calculated?
How are amounts of chemicals in solution measured?

Making useful chemicals

What useful products can be made from acids?What useful products can be made from acids?
How do chemists control the rate of reactions?
What factors affect the yield of chemical reactions?

Radiation and waves

What are the risks and benefits of using radiations?
What is climate change and what is the evidence for it?
How do waves behave?

Sustainable energy

How much energy do we use?
How can electricity be generated?

Electric circuits

What determines the current in an electric circuit?
How do series and parallel circuits work?
What determines the rate of energy transfer in a circuit?
What are magnetic fields?
How do electric motors work? Chapter P4: Explaining motion Chapter P5: Radioactive materials Chapter P6: Matter – models a

Explaining motion

What are forces?
How can we describe motion?
What is the connection between forces and motion?
How can we describe motion in terms of energy transfers?

Radioactive materials

What is radioactivity?
How can radioactive materials be used safely?

Matter – models and explanations

How does energy transform matter?
How does the particle model explain the effects of heating?
How does the particle model relate to materials under stress?

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