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Grade 9 Second Semster > Science Chemistry > Flashcards

Science Chemistry Flashcards

1
Q

Safety hazard symbols

A

A system of communicating how dangerous a substance is using symbols inside specifically coloured shapes.

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2
Q

WHMIS/MSDS

A

A system of symbols designed to help protect people who use potentially harmful substances.

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3
Q

Matter

A

Anything that has mass and occupies space.

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4
Q

Properties of matter

A

Characteristics that can be used to describe a substance.

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5
Q

States of matter

A

Refers to 3 common characteristics states in which matter can exist:

  • solids
  • liquid
  • gas
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6
Q

Melting

A

Change of state from sold to liquid.

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7
Q

Evaporation

A

Change of state from liquid to gas.

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8
Q

Condensation

A

Change of state from gas to liquid.

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9
Q

Freezing

A

Change of state from liquid to solid.

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10
Q

Sublimation

A

change of state from a solid to a gas

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11
Q

Deposition

A

changeo of state from a gas to a solid

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12
Q

Physical Property

A

property that describes the physical appearance and composition of a substance

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13
Q

Examples of Physical Properties

A

Hardness, density, conductivity, solubility, ductility, etc.

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14
Q

Physical Change

A

A change in the appearance

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15
Q

Chemical Property

A

A property of behaviour of a substance when it undergoes a chemical reaction

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16
Q

Chemical Change

A

a reaction between two substances

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17
Q

Pure Substance

A

a substance that is made of one kind of matter

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18
Q

Element

A

Pure substance made of one atom

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19
Q

Compound

A

Pure substance made of two atoms or more

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20
Q

Mixtures

A

a combination of pure substances

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21
Q

Mechanical Mixture

A

you can see the substances

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22
Q

Solution

A

Appears to be one substance

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23
Q

Aqueous

A

solution where water is the solvent

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24
Q

Suspension

A

a cloudy mixture which can seperate

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25
Q

Colloid

A

a cloudy mixture that won’t seperate

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26
Q

Periodic Table

A

a chart that shows all the elements that humans have discovered.

27
Q

Period

A

horizontal row of elements in the periodic table

28
Q

Group

A

a vertical column of elements in the periodic table

29
Q

Family

A

a vertical column of elements in the periodic table

30
Q

Atom

A

the smallest part of an element

31
Q

Nucleus

A

positively charged center of an atom

32
Q

Protons

A

positively charged sub-atomic particle

33
Q

Electrons

A

Negitively charged sub-atomic particle, found orbiting the nucleus

34
Q

Neutrons

A

neutrally charged sub-atomic particle

35
Q

Atomic Number

A

the number of protons in the element

36
Q

Atomic Mass

A

average mass of one atom of an element

37
Q

Mass Number

A

the sum of the number of protons and neutrons in an atom rounded version of the atomic mass

38
Q

Metals

A

shiny, malleable, ductile elements that conduct electricity

39
Q

Non-metals

A

dull, brittle elements that do not conduct electricity

40
Q

Metaloids

A

elements that have both metallic and non-metallic properties

41
Q

Alkali

A

group 1 elements in the PT not including Hydrogen. Most reactive

42
Q

Alkaline Earth Metals

A

group 2 elements in the PT. Still highly reactive

43
Q

Halogens

A

group 17 elements in the PT most reactive of non-metals

44
Q

Noble Gases

A

group 18 elements in the PT most stable

45
Q

Chemical Formula

A

a combination of symbols that represent a compound

46
Q

Ions

A

atoms that have become electrically charged due to the lose or gain of electrons

47
Q

Polyatomic Ions

A

groups of atoms acting a single ion

48
Q

Ionic Compound

A

pure substance formed when a positively charged ion and negatively charged ion chemically combine

49
Q

Molecule

A

group of atoms joined by covalent bonds

50
Q

Molecular Compound

A

Pure substance formed when non-metallic atoms chemically combine

51
Q

Chemical Reaction

A

a reaction that takes place between to or more substances

52
Q

Reactants

A

a substance that reacts with another substance in a chemical formula

53
Q

Product

A

the new substances formed by the reaction

54
Q

Exothermic

A

a chemical reaction that releases energy (heat out)

55
Q

Endothermic

A

a chemical reaction that absorbs energy ( heat in)

56
Q

Combustion

A

a chemical reaction that occurs when oxygen reacts with a substance creating carbon dioxide and water

57
Q

Corrosion

A

a slow chemical reaction that occurs when oxygen in the air reacts with a metal

58
Q

Cellular Respiration

A

a chemical reaction that occurs in our cells similar to combustion

59
Q

Open System

A

an experiment in which products can escape

60
Q

Closed System

A

an experiment in whish no products can escape

61
Q

Law of Conservation of Mass

A

the principle that matter is neither created or destroyed only changed into another form

62
Q

Calalyst

A

a substance that helps a chemical reaction to proceed more quickly

63
Q

Enzymes

A

a catalyst involved in chemical reactions that occur in living things

64
Q

The four factors that can affect the rate at which a chmical reaction can occur

A

Presence of calalysts
Concentration
Temperature
Surface Area

Grade 9 Second Semster (5 decks)

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