Chemistry End Untit Test

Question 0

Explain condensation on cold glass in summer

Answer 0

Particles strengthen and heat is removed from water in the air

Question 1

What are the 5 parts of the particle theory?

Answer 1

Everything is made of particles
All particles of 1 substance are the same
Spaces between particles are large compared to the particle itself
Particles are always moving
Attracting forces between particles

Question 2

What r the 3 states of matter

Answer 2

Solid
Liquid
Gas

Question 3

What r the 6 changes of state?

Answer 3

Deposition
Melting. Evaporating
◼️

Question 4

What r the 2 types of particles

Answer 4

Atoms

Molecules

Question 5

What is an atom

Answer 5

Another word for element

Question 6

Give an example of an element molecule

Answer 6

Hydrogen gas
Oxygen gas
Ect

Question 7

What’s a compound molecule

Answer 7

More than 1 type of atom

Ex water

Question 8

Define pure substance

Answer 8

Only contains 1 kind of particle

Question 9

Define mixture

Answer 9

More than 1 kind of particle

Question 10

What’s a homogeneous mixture

Answer 10

Different particles
Can’t see difference
Ex apple juice

Question 11

What is a heterogenous mixture

Answer 11

Can visually see difference

Ex chocolate chip cookies

Question 12

What r the 3 common gasses

Answer 12

H2
O2
CO2

Question 13

Describe the 3 common gasses

Answer 13

H2 is explosive
O2 is essential to life
CO2 is used to extinguish fires and plant need it for photosynthesis

Question 14

Count the atoms

2 Mg3 (PO4)2

Answer 14

Mg - 6
P - 4
O - 16

Question 15

What r the 2 types of physical properties

Answer 15

Qualitative

Quantitative

Question 16

Name 4 qualitative and quantitative properties

Answer 16

Ductility, malatibility, viscosity, lustre ect

Melting pt., boiling pt., mass, density

Question 17

What r the 2 types of chem properties

Answer 17

Reaction with acid

Combustibility

Question 18

What evidence proves physical change

Answer 18

Change in state

Distillation ex sugar + water

Question 19

What evidence proves chem change

Answer 19

Heat and light is given off
Gas bubbles given off without adding heat
Precipitate
New permanent colour/scent

Question 20

What is a proton

Answer 20

Positive
Atomic #
In nucleus

Question 21

What’s an electron

Answer 21

Negative
Virtually no mass
In orbit

Question 22

What is a neutron

Answer 22

0 charge
Atomic mass - atomic #
In nucleus

Question 23

How many electrons can be on each orbital ring as far as we need to know for gr 9

Answer 23

Orbit 1 2
Orbit 2. 8
Orbit 3. 8
Orbit 4. 2

Question 24

How does standard atomic notation work

Answer 24

Element symbol in middle Mass on top Atomic number on bottom

Question 25

Due to isotopes what # may change

Answer 25

The atomic mass

Question 26

Who created the first model of the atom

Answer 26

John dalton

Question 27

What did john Dalton think the atom looked like

Answer 27

Spheres that were all different colours and sizes

Question 28

What were the 4 things john dalton thought.

Answer 28

All matter is made of atoms Each element has its own kind of atoms Different elements combine to form compounds Atoms cannot be created, distroyed, or subdivided

Question 29

Who came up with the plum pudding model?

Answer 29

J.J. Thompson

Question 30

Who discovered electrons

Answer 30

J.J Thompson

Question 31

What did J.J Thompson assume

Answer 31

The rest of the atom was positively charged

Question 32

Who conducted the gold foil experiment

Answer 32

Ernest Rutherford

Question 33

What did Ernest rutherford's model of the atom look like

Answer 33

All protons in the nucleus and electrons around the outside

Question 34

What 2 things did Rutherford think after doing the gold foil experiment

Answer 34

Atom has tiny dense nucleus that has positive charge | Nucleus is surrounded by empty space containing rapidly moving electrons

Question 35

Who came up with the planetary model of the atom

Answer 35

Niels Bohr

Question 36

What did Niels Bohr think about the atom

Answer 36

Electron move in circular paths called orbits around the nucleus The further away the electron is from the nucleus the greater it's energy Electrons are more stable the closer they r to the nucleus

Question 37

What kind of atom do we use now

Answer 37

Bohr-Rutherford model

Question 38

How does the Bohr-Rutherford model of an atom work

Answer 38

``` # of protons in nucleus is the atomic # The # of neutrons in nucleus is atomic # - atomic mass # of electrons in orbit is the atomic # ```

Question 39

What happened in the gold foil experiment?

Answer 39

Alpha particles were shot at gold foil