Science
Biology, chemistry, physics and the scientific method.
Study guides
- Photosynthesis: Quick RevisionQuick revision
- Newton's Laws of Motion ExplainedSupporting explainer
- Balancing Chemical EquationsWorked example
- Cell Structure BasicsSupporting explainer
- pH, Acids and BasesSupporting explainer
- Speed, Velocity and AccelerationSupporting explainer
- Scientific Method and Experimental VariablesSupporting explainer
Key vocabulary
- AccelerationThe rate of change of velocity.
- AcidA substance that produces hydrogen ions in water and has a pH below 7.
- BaseA substance that neutralises acids.
- CellThe basic unit of structure and function in living organisms.
- Chemical equationA representation of a chemical reaction using formulas.
- ChlorophyllThe green pigment in plants that absorbs light for photosynthesis.
- ChloroplastAn organelle in plant and algal cells that contains chlorophyll and carries out photosynthesis.
- Dependent variableThe variable you measure in an experiment.
- DisplacementThe straight-line distance and direction from the start to the end point.
- ForceA push or pull on an object, measured in newtons.
- GlucoseA simple sugar that cells use as a source of energy.
- HypothesisA testable explanation or prediction that evidence can support or contradict.
- Independent variableThe variable you deliberately change in an experiment.
- InertiaThe tendency of an object to resist changes in its motion.
- MassThe amount of matter in an object, measured in kilograms.
- MitochondrionAn organelle where aerobic respiration releases energy for the cell.
- NeutralisationThe reaction of an acid with a base to form a salt and water.
- OrganelleA structure inside a cell that has a specific function.
- pHA scale, usually from 0 to 14, that measures how acidic or alkaline a solution is.
- PhotosynthesisThe process by which plants and some other organisms use light energy to make glucose from carbon dioxide and water.
- ProductA substance formed in a chemical reaction.
- ReactantA substance that is present at the start of a chemical reaction and is changed by it.
- VelocitySpeed in a given direction.