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Revision cards for NCEA Level 1 Chemistry 1.5 Paper

Atom the smallest particle that can exist
Electron a subatomic particle with a negative charge
Proton a subatomic particle with a positive charge
Neutron a subatomic particle with no charge
Nucleus positively charged center of an atom
Atomic Number number of protons in a nucleus of an atom
Atomic Mass equal to the number of protons and neutrons in the nucleus of an atom
Element substance consisting of atoms that have the same number of protons
Compound substance formed when two or more elements are chemically bonded
Ion atom with no charge due to loss and gain of electrons
Cation positively charged ion
Anion negatively charged ion
Chemical Formula set of chemical symbols showing the elements present in a compound
Catalyst any substance that increases the rate of reaction without undergoing any permanent change in the process
Collision Theory in order for a chemical reaction to occur, two or more particles must collide with sufficient force at the correct orientation
Concentration relative amount of substance contained in a particular space
Particle Theory all matter is made up of tiny particles that are in constant motion
Reaction Rate how fast or slow a reaction occurs
Surface Area the outermost part of something
Acid atoms composed of one or more hydrogen atoms
Base atoms composed of hydroxide atoms
Alkali a base that can dissolve in liquids
Dilute a weak substance due to the addition of another substance
Neutralization reaction where an acid or a base cancel out the other
Salt ionic compound formed by the neutralization of acids and bases
pH Scale represents the concentration of acids and bases
Created by: LorenK14