Chemistry

Question 1

WHMIS SYMBOLS

Answer 1

Workplace Hazardous Materials Information System

Question 2

Solids

Answer 2

-definite shape and volume

Question 3

Liquids

Answer 3

-no definite shape
-definite volume
-takes shape of the container

Question 4

Gas

Answer 4

-doesn’t have a definite shape or volume
-takes shape of the volume in its container

Question 5

Volume

Answer 5

a quantity of space occupied by an object

Question 6

Particle Theory of Matter

Answer 6

1)all matter is made of particle
2)all particles have spaces between them
3)all particles are moving all the time
4)particles move faster and spread apart further if they are heated up
5) particles attract each other

Question 7

pure substance vs mixtures

Answer 7

Pure substance: element compound
Mixtures: homogeneous and heterogeneous

Question 8

element

Answer 8

a pure substance that cannot be broken down into simpler parts by any chemical methods

Question 9

compound

Answer 9

a pure substance that is made of 2+ elements that can be broken down to elements

Question 10

mixture

Answer 10

contains 2+ pure substances mixed together

Question 11

homogeneous mixture

Answer 11

looks like a single mixture ex) coffee, wine, air

Question 12

heterogeneous mixture

Answer 12

a mix of diff. parts that are visible but can’t be mixed or be taken apart ex) pizza, cookies, salad

Question 13

solutions

Answer 13

solute + solvent = solutions

Question 14

Density

Answer 14

the ratio of mass per unit of volume D=m/v

Question 15

Quantitative

Answer 15

numerical or measurable

Question 16

Qualitative

Answer 16

observed with senses

Question 17

Physical Properties

Answer 17

odour, state, texture, shape
observed not measured

Question 18

Physical Change Rules

Answer 18

1)can be undone or reversible
2) no new substances is formed
3) change of shape, size, form
4) change of state

Question 19

Chemical changes

Answer 19

combustibility, reactivity with oxygen,water,other sub., acids

Question 20

Chemical Change Rules

Answer 20

1) Forms a new substance
2) it is not reversible
3) change in colour
4) produces a gas
5) observed or releases heat or light
6)formation of a precipitate

Question 21

Atom types

Answer 21

protons, neutrons, electrons

Question 22

Atomic number

Answer 22

is the number of protons and electrons in a atom

Question 23

atomic mass

Answer 23

the mass of the atom

Question 24

mass number

Answer 24

protons + neutrons in the nucleus
mass # - atomic # = neutrons

Question 25

ions

Answer 25

charged atoms

Question 26

Metals

Answer 26

metals - cation - loses electrons

Question 27

Ionic

Answer 27

metal + non-metal = ionic

Question 28

Molecular

Answer 28

non-metal + non-metal = molecular

Question 29

Dalton

Answer 29

solid sphere

Question 30

Thomson

Answer 30

plum pudding

Question 31

Rutherford

Answer 31

nuclear model

Question 32

Bohr

Answer 32

planetary

Question 33

Democritus

Answer 33

just shapes or round circles

Question 34

Who made the periodic table?

Answer 34

Mendeleev - Russia Chemist arranged the elements in the tablet but he arranged by atomic mass (not correct)

Question 35

modern periodic table

Answer 35

organized by atomic number

Question 36

group 1

Answer 36

Alkiali Metals
- metals
-soft
-low melting point
-reacts with water to release hydrogen gas

Question 37

group 2

Answer 37

Alkaline Metals
-when they burned they release bright colors
(valence electrons get excited and jump up and down through the orbitals)

Question 38

group 17

Answer 38

Halogens
-non-metals
-corrosive

Question 39

group 18

Answer 39

Noble gases
-nonmetals
-non-reactive
-stable

Question 40

7 diatomic elements

Answer 40

Hydrogen
Nitrogen
Fluorine
Oxygen
Iodine
Chlorine
Bromine