• chemical that speeds up (or slows down) a chemical reaction
• but is not used up in the reaction
• e.g. manganese dioxide in making oxygen from hydrogen peroxide
Cell
• basic building block (or unit) of life
A = Vacuole
B = Nucleus
C= Cytoplasm
D = Cell membrane
E = Cell Wall
F = Cell sap in vacuole
G = Chloroplast
Centre of Gravity
• point through which
• all the weight of an object
• appears to act
Chemical Energy
• is found in the chemical bonds in• food• fuel and• batteries
Chlorination
• adding of chlorine to drinking water to kill bacteria and prevent illness
Chromatography
• separating different colour soluble inks using a suitable solvent
Competition
• when two or more organisms • fight for something in short supply • e.g. birds fight for worms
Chemical Change
• happens when at least one new substance is formed e.g. burn a match makes ash
Compound
• two or more different ELEMENTS chemically combined
• e.g. iron and sulfer make iron sulfide
Condensation
• when a gas changes to a liquid • (due to cooling)
Conductor
• substance that lets heat or electricity through it
Conduction
• movement of heat • through a solid• without the particles moving out of place• e.g. poker in fire
Convection
• movement of heat• through a liquid or gas• by the movement of the particles around the container• e.g. hot air rises and cold air falls • e.g. water heating in a kettle
Covalent Bond• is formed when • a pair of electrons are shared • between two atoms• e.g. water or hydrogen gas
Current
• flow of electric charge in a circuit
• measured in Amps (A)
• measured using an ammeter in series
• symbol is I
Contraception• preventing fertilisation or pregnancy
Chromosomes found in the nucleus of cells carry genes which control how we look etc.Made of DNA and protein
• Do I know it??• Cartilage• Carnivore• Catalyst• Cell• Centre of Gravity• Chemical Energy• Chlorination• Chromatography• Competition