EMC

Question 1

Properties of Mixture

Answer 1

1. No chemical reaction when formed
2. Amt. of substance varies (variable composition)
3. has same properties as substance mixed tgt.
4. melting/ boiling points vary
5. easily separated by physical methods

Question 2

Properties of a compound

Answer 2

1. Chemical reaction when it is made
2. Fixed amt. of substance
3. own properties different from elements its composed of
4. fixed mp/bp
5. cannot be broken down by physical method

Question 3

Properties of elements

Answer 3

Cannot be broken down into simpler subs

all atoms of same element hv same chem properties

Question 4

What are compounds

Answer 4

Formed by different elements chemically combined together

Question 5

What ave mixtures

Answer 5

Formed by 2/ more elements or compounds physically combined together.

Question 6

What are atoms?

Answer 6

Simplest substance cannot be broken down

Smallest particle to remain intact in chem reaction, only broken down during nucleur reaction

Question 7

What is a molecule?

Answer 7

Many atoms joined together (chemically)

Formed when 2 or more molecules are CoV bonded tgt

Question 8

What are alloys?

Answer 8

Alloys are mixtures of metallic elements only and w non metallic or metallic impurities

NOTE ALSO A MIXTURE

Question 9

What is a pure subs?

Answer 9

OnLy one element or compound

Vacuum in btw particles

Question 10

What are monatomic diatomic molecules

Answer 10

Exist as single / double atoms

Question 11

Diatomic elements?

Answer 11

HNOF DOWN TO AT

Question 12

Cations

Silver
Zinc
Leas

Answer 12

Ag+
Zn2+
Pb2+

Question 13

Ions

Answer 13

Oh- 
Co32- 
No3- 
So42- 
Po43-

Question 14

CoV stuff

Water
Ammonia
Methane

Answer 14

H2O
NH3
CH4