Properties
A characteristic of matter that you can observe or measure, such as state, colour, or density
Physical Property
Negatively charged particles surrounding the atomic nucleus
Electron
An attempt to describe the nature of matter and explain how matter behaves
Atomic Theory
These provide users with all important safety (human and environmental) information when handling a certain chemical
MSDS
A pure substance that cannot be broken down into simpler components
Element
Positively charged particle in the atomic nucleus
Proton
Thomson’s model to explain the atom; negative electrons as being scattered throughout the positive area of the atom
Raison Bun Model
Anything that has mass and volume
Matter
A change in matter in which chemical bonds are formed and broken and at least one new substance is produced
Chemical Change
The smallest particle of an element that retains the properties of that element
Atom
Dalton’s model to explain the atom; particles that make up matter are like small, hard spheres that are different for different elements
Billiard Ball Model
System of eight warning symbols used throughout Canada to provide safety information about chemicals
WHMIS
This property is detected only by observing how a substance reacts with other substances
Chemical Property
The positively charged centre of an atom, which contains protons and neutrons
Nucleus
Bohr’s model to explain the atom; electrons surround the nucleus in specific energy “levels” or “shells”
Orbital Model
The amount of space taken up by a substance or object, usually measured in litres (L) or cubic centimetres
Volume
A change in matter in which the appearance may change but no chemical bonds are broken or made and no new substance is formed
Physical Change
Uncharged particle in the nucleus of an atom
Neutron
Rutherford's model to explain the atom; he saw the electrons circling the center of the atom in much the same way planets circle the sun
Planetary (Nuclear) Model
The amount of matter in a substance or an object; usually measured in kilograms (kg)
Mass