Video Library

Strategies for tackling difficult problem solving questions in chemistry. What is atom economy? How can atom economy be improved? Why is atom economy important/ What else should we consider when choosing a reaction route?

Easy atomic structure covering sub-atomic particles and why atoms are neutral overall.

Mass Number, Isotopes and Relative Atomic Mass (RAM)

Complete lesson with notes and worksheet on Relative Atomic Mass RAM

Hazards and Risks in Science. Hazard pictograms. Describe the use of hazard symbols on containers: a to indicate the dangers associated with the contents b to inform people about safe-working precautions with these substances in the laboratory Evaluate the risks in a practical procedure and suggest suitable precautions for a range of practicals including those mentioned in the specification

Earth and atmosphere Origin and Climate Change Part 1 Recall that the gases produced by volcanic activity formed the Earth’s early atmosphere Describe that the Earth’s early atmosphere was thought to contain: a little or no oxygen b a large amount of carbon dioxide c water vapour d small amounts of other gases and interpret evidence relating to this. Explain how condensation of water vapour formed oceans. Explain how the amount of carbon dioxide in the atmosphere was decreased when carbon dioxide dissolved as the oceans formed. Explain how the growth of primitive plants used carbon dioxide and released oxygen by photosynthesis and consequently the amount of oxygen in the atmosphere gradually increased PART 2: Describe how various gases in the atmosphere, including carbon dioxide, methane and water vapour, absorb heat radiated from the Earth, subsequently releasing energy which keeps the Earth warm: this is known as the greenhouse effect Evaluate the evidence for human activity causing climate change, considering: a the correlation between the change in atmospheric carbon dioxide concentration, the consumption of fossil fuels and temperature change b the uncertainties caused by the location where these measurements are taken and historical accuracy Describe: a the composition of today’s atmosphere b the potential effects on the climate of increased levels of carbon dioxide and methane generated by human activity, including burning fossil fuels and livestock farming c that these effects may be mitigated: consider scale, risk and environmental implications

Maths in Science for GCSE and A level with FREE worksheet, hints and tips.