Unit Test 2

Question 1

pure substance – what is it? Give some examples

Answer 1

It’s an element like iorn

Question 2

element – what is it? Give some examples

Answer 2

A chemical substance like gold

Question 3

compound – what is it? How is it different from an element?

Answer 3

A mix of 2 or more elements

Question 4

what are valence electrons?

Answer 4

The electrons on the last shell

Question 5

cation/anion – what are they?

Answer 5

Cation is a positive charged ion and Anion is a negative chraged ion

Question 6

states of matter – name them/ particles distribution/ (mass/shape/volume)?

Answer 6

Solid: Particles are close together has mass shape and volume
Liquid: Particles are further apart has mass and has no shape
Gas: Particles are far away has no mass or volume

Question 7

atom structure –all 5 parts and their location

Answer 7

Nucleus, orbit, proton, electron, neutron

Question 8

heterogeneous mixture – definition and examples

Answer 8

A mechanical mixture where the two thing are visibly separate

Question 9

what is a isotope

Answer 9

It’s an atom with a different amount of neutron from protons

Question 10

what is a ion

Answer 10

an electric charge that an atom takes on when it loses or gains electrons

Question 11

what is atomic models –> scientists (names) + what each scientist discovered (their contribution to our understanding of the atom)

Answer 11

Bohr

Question 12

who created the periodic table?

Answer 12

Demetri Mandlev

Question 13

what is ionic and molecular compounds – what is the difference?

Answer 13

ionic = Non-metal + metal
Molecular = Non-metal + Non-metal

Question 14

• how many elements are known today?

Answer 14

118

Question 14

• the structure of each “BOX” from periodic table – what the symbols/ numbers mean?

Answer 14

Atomic number: Number of protons an atom has
Atomic mass: Mass of an atom of a chemical element
Element name: Name of the element of the periodic table
Element symbol: one or two letter to represent an element of the periodic table

Question 15

• columns – what are they? Name the ones we discussed in class and KNOW where they are located

Answer 15

18 vertical rows, on the left Alkali metals, Alkaline earth metals, on the right halogens, noble gases

Question 16

• periods - what are they? Why are they important – what information can we get?

Answer 16

7 horizontal rows Depending on what period is the more shell it has

Question 17

• what are noble gasses + characteristics +location

Answer 17

the 18 group on the right non-metallic and very unreactive

Question 18

• what are halogens +characteristics+ location

Answer 18

the 17 group on the right non-metallic elements that are strongly reactive

Question 19

• what are alkali metals+ characteristics+ location

Answer 19

The 1 group on the left metallic elements that are strongly reactive

Question 20

• what are alkaline earth metals + characteristics+ location

Answer 20

The 2 group on the left metallic elements that are reactive

Question 21

know all 3 formulas

Answer 21

M/V=D
M/D=V
D/V=M

Question 22

Name 3 properties of metals/non-metals?

Answer 22

state of matter, colour and luster

Question 23

What are metalloids?

Answer 23

They’re a mix of metals and non-metal

Question 23

Where are the metals, non-metals and metalloids located on the periodic table?

Answer 23

Metal are on the left and have the most elements, Metaliods are between metals and non metals, non metals are on the right