notes for topic 1-3 unit 2

Question 1

what are the two types of mixtures

Answer 1

Homogenous and heterogenous

Question 2

what are another word for homogenous

Answer 2

solution

Question 3

what is another word for heterogenous

Answer 3

mechanical mixtures

Question 4

what are the different points of identifying a homogenous mixture

Answer 4

can’t see different particles

• Looks like it is only one kind of particle
• light passes through it
• usually clear
• to separate the particles you have to heat and evaporate the liquid.
• different substances evaporate at different temperatures
• usually coloured

Question 5

what are different ways of identifying a heterogenous mixture

Answer 5

• can see more than one particle
• can be further classified by size of particle
  1. suspension
  2. colloid
  3. emulsion
  4. ordinary mechanical mixtures

Question 6

what is an ordinary mechanical mixture

Answer 6

the mixture is very obvious. can really see the different particles mixed together ex. raisin bran, chocolate cookie,

Question 7

what is a suspension

Answer 7

large particles that are mixed but settle if you leave them, ex ketchup, BBQ sauce, Flour, Charcoal

Question 8

what is emulsion

Answer 8

liquid in liquid ex oil+ water

milk, mayo, salad dressing

Question 9

what is a colloid

Answer 9

2 fine particles mixed together

• scatter light
  ex. fog, aerosal, jello, clouds

Question 10

what two categories can matter be broken into

Answer 10

pure substances

mixtures

Question 11

what is an element and what is an example

Answer 11

a single element on the periodic table O= oxygen

Au= gold, Na= sodium

Question 12

what is a compound and what is an example

Answer 12

more than one lament but all the particles are the same. ex. CO2= carbon dioxide
H20= water
Na Cl= salt

Question 13

are atoms positive or negative

Answer 13

the answer is that they are neutral

Question 14

how can we identify physical change

Answer 14

a. state change (solid- liquid-gas)

b. dissolving c. breaking

Question 15

how can you identify a chemical reaction

Answer 15

1. temperature change
2. gas produced.
3. color change
4. precipitate forms with two liquids (a chunk of solid forms in a liquid)

Question 16

how can physical properties be identified

Answer 16

qualitative= can be described as not measured 
1. pH 
2. Odor 
3. state (solid, liquid, gas)
4. Colour 
Quantitative:
1. Boiling point 
2. freezing point 
3. melting point 
4. density (how well it floats ) 
5. solubility (how it dissolves) 
6. viscosity (how runny it is )

Question 17

what are chemical properties and how can they be identified

Answer 17

any property that described how a substance reacts with another substance when forming a new substance

1. combustibility
2. how it reacts with water
3. how it reacts with the acid
4. how it reacts with pure oxygen

Question 18

is combustibility a chemical property

Answer 18

no, because it creates new substances

Question 19

is helium able to burn

Answer 19

no, but hydrogen van burns explosively.

Question 20

what is malleability

Answer 20

is a substances ability to deform under pressure

Question 21

what is ductility

Answer 21

is the ability of a medal to be stretched out without becoming weak

Question 22

what is the percent of hydrogen and oxygen combined together

Answer 22

11% hydrogen and 89% oxygen by mass

Question 23

what are daltons atomic theory

Answer 23

• all matter is made up of small particles called atoms
• atoms cannot be created, destroyed, or divided into small particles
• all atoms of the same element are identical in mass and size. Atoms of one element are different in mass and size from the atoms of other elements.
  compounds are created when atoms of different elements link together in definite proportions.

Question 24

what is the light scattering properties of colloids called

Answer 24

Tyndall effect