Post on 03-Jan-2016
Catalyst
• 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
Competition
• when two or more organisms • fight for something in short supply • e.g. birds fight for worms
Compound
• two or more different ELEMENTS chemically combined
• e.g. iron and sulfer make iron sulfide
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
Chromosomes found in the nucleus of cells carry genes which control how we look etc.Made of DNA and protein