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BC Science 9 Ch1

BC Science 9 Chapter 1

What does WHMIS stand for? Workplace Hazardous Materials Information System
The amount of matter in a substance. Mass
The amount of space a substance occupies. Volume
Density Mass/Volume
Smallest particle of a chemical element. Atom
Two or more atoms joined together. Molecule
Pure substance Has the same identical physical and chemical properties always.
Loose mixture of items that can easily pick apart. Mechanical mixture
Mixture of solids, liquids, or gases that appear to be one substance. Solution
Mixture of a liquid with a solid that floats when mixed together. Suspension
What is a chemical change? A change in matter when new substances are produced.
What happens when a physical change occurs? There may be a change in appearance, but no new substances are formed.
Particles of matter are always doing this? Moving
Energy of motion Kinetic energy
Found between particles Empty space
Change of state: solid to liquid Melting
Change of state: liquid to solid Solidification
Change of state: solid to gas Sublimation
Change of state: gas to solid Deposition
Change of state: gas to liquid Condensation
Change of state: liquid to gas Evaporation
Properties that can be described but not measured Qualitative
Properties that can be measured numerically Quantitative
What is a pure substance? Element or compound
Aristotle's four elements: Earth, water, air, fire
Alchemists were looking for what? Philosopher's stone (cheap metals to gold)
Dalton called the smallest particle of an element this? Atom
A model to describe Thomson's model of the atom Raisin bun model
Describes Thomson's model of the atom A positively charge mass surrounded by negatively charged particles
Thomson described negatively charges; later called this Electrons
Rutherford described the atom as being made up of mostly this? Empty space
Rutherford called the centre of the atom this? Nucleus
Rutherford described the atom this way? A tiny dense centre called a nucleus with electrons around it
Bohr described the location of electrons this way. Around the nucleus in specific energy levels or shells
What are the three subatomic particles? Proton, electron, neutrons
Charge of a proton Positive
Charge of an electron Negative
Charge of a neutron Neutral
Occupies the most space in an atom Electron shells
Most of the mass in an atom is found here? Nucleus
Heaviest subatomic particle Proton or Neutron
Created by: darrinaustin