Science Chemistry

Question 1

Safety hazard symbols

Answer 1

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

Question 2

WHMIS/MSDS

Answer 2

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

Question 3

Matter

Answer 3

Anything that has mass and occupies space.

Question 4

Properties of matter

Answer 4

Characteristics that can be used to describe a substance.

Question 5

States of matter

Answer 5

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

• solids
• liquid
• gas

Question 6

Melting

Answer 6

Change of state from sold to liquid.

Question 7

Evaporation

Answer 7

Change of state from liquid to gas.

Question 8

Condensation

Answer 8

Change of state from gas to liquid.

Question 9

Freezing

Answer 9

Change of state from liquid to solid.

Question 10

Sublimation

Answer 10

change of state from a solid to a gas

Question 11

Deposition

Answer 11

changeo of state from a gas to a solid

Question 12

Physical Property

Answer 12

property that describes the physical appearance and composition of a substance

Question 13

Examples of Physical Properties

Answer 13

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

Question 14

Physical Change

Answer 14

A change in the appearance

Question 15

Chemical Property

Answer 15

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

Question 16

Chemical Change

Answer 16

a reaction between two substances

Question 17

Pure Substance

Answer 17

a substance that is made of one kind of matter

Question 18

Element

Answer 18

Pure substance made of one atom

Question 19

Compound

Answer 19

Pure substance made of two atoms or more

Question 20

Mixtures

Answer 20

a combination of pure substances

Question 21

Mechanical Mixture

Answer 21

you can see the substances

Question 22

Solution

Answer 22

Appears to be one substance

Question 23

Aqueous

Answer 23

solution where water is the solvent

Question 24

Suspension

Answer 24

a cloudy mixture which can seperate

Question 25

Colloid

Answer 25

a cloudy mixture that won't seperate

Question 26

Periodic Table

Answer 26

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

Question 27

Period

Answer 27

horizontal row of elements in the periodic table

Question 28

Group

Answer 28

a vertical column of elements in the periodic table

Question 29

Family

Answer 29

a vertical column of elements in the periodic table

Question 30

Atom

Answer 30

the smallest part of an element

Question 31

Nucleus

Answer 31

positively charged center of an atom

Question 32

Protons

Answer 32

positively charged sub-atomic particle

Question 33

Electrons

Answer 33

Negitively charged sub-atomic particle, found orbiting the nucleus

Question 34

Neutrons

Answer 34

neutrally charged sub-atomic particle

Question 35

Atomic Number

Answer 35

the number of protons in the element

Question 36

Atomic Mass

Answer 36

average mass of one atom of an element

Question 37

Mass Number

Answer 37

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

Question 38

Metals

Answer 38

shiny, malleable, ductile elements that conduct electricity

Question 39

Non-metals

Answer 39

dull, brittle elements that do not conduct electricity

Question 40

Metaloids

Answer 40

elements that have both metallic and non-metallic properties

Question 41

Alkali

Answer 41

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

Question 42

Alkaline Earth Metals

Answer 42

group 2 elements in the PT. Still highly reactive

Question 43

Halogens

Answer 43

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

Question 44

Noble Gases

Answer 44

group 18 elements in the PT most stable

Question 45

Chemical Formula

Answer 45

a combination of symbols that represent a compound

Question 46

Ions

Answer 46

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

Question 47

Polyatomic Ions

Answer 47

groups of atoms acting a single ion

Question 48

Ionic Compound

Answer 48

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

Question 49

Molecule

Answer 49

group of atoms joined by covalent bonds

Question 50

Molecular Compound

Answer 50

Pure substance formed when non-metallic atoms chemically combine

Question 51

Chemical Reaction

Answer 51

a reaction that takes place between to or more substances

Question 52

Reactants

Answer 52

a substance that reacts with another substance in a chemical formula

Question 53

Product

Answer 53

the new substances formed by the reaction

Question 54

Exothermic

Answer 54

a chemical reaction that releases energy (heat out)

Question 55

Endothermic

Answer 55

a chemical reaction that absorbs energy ( heat in)

Question 56

Combustion

Answer 56

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

Question 57

Corrosion

Answer 57

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

Question 58

Cellular Respiration

Answer 58

a chemical reaction that occurs in our cells similar to combustion

Question 59

Open System

Answer 59

an experiment in which products can escape

Question 60

Closed System

Answer 60

an experiment in whish no products can escape

Question 61

Law of Conservation of Mass

Answer 61

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

Question 62

Calalyst

Answer 62

a substance that helps a chemical reaction to proceed more quickly

Question 63

Enzymes

Answer 63

a catalyst involved in chemical reactions that occur in living things

Question 64

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

Answer 64

Presence of calalysts Concentration Temperature Surface Area