mixtures and properties of matter

Question 1

distinguish between a suspension and a colloid

Answer 1

A suspension separates over time while a colloid doesn’t separate over time, rather maintains its cloudiness.

Question 2

define a mixture

Answer 2

• 2 or more elements and or compounds
• No definite composition
• Can be either homogenous (uniform) or heterogenous (non-uniform)

Question 3

define a solution

Answer 3

• Must be clear/transparent
• The part of the solution that does the dissolving is called = SOLVENT
• The smaller concentrate is the solute
• Solvent = mixer (milk) while solute = the stuff that gets mixed (milo)
• Solutions cannot be filtered aka filtrated

Question 4

distinguish between a homogenous and heterogenous mixture

Answer 4

homogenous (uniform) or heterogenous (non-uniform)

Question 5

are all mixtures solutions?

Answer 5

no but all solutions are mixtures

Question 6

define a colloid

Answer 6

• Cloudy
• Larger particle size
• Do not separate by filtration or standing
• Solvent is referred to as the dispersion medium and the solute is the particles

Question 7

define a suspension

Answer 7

• Largest particle size
• Once separated the dispersion medium may appear clear
• Will separate upon standing and can be separated via filtration

Question 8

difference between a mixture and compound

Answer 8

MPORTANT NOTE: a mixture is an impure substance that can be separated into two or more pure substances.

A mixture hasn’t chemically changed its molecular composition, while a compound has.

Question 9

name some physical characteristics

Answer 9

Common physical characteristics
o Boiling and melting point
o Conductivity
o Lustre
o Colour
o Magnetism
o Solubility
o Ductility
o Size

Question 10

what is filtration and what is it dependent on

Answer 10

insoluble solid from liquid, particle size

Question 11

what is decantation and what is it dependent on

Answer 11

separates solids and liquids based on density

Question 12

what is distillation and what is it dependent on

Answer 12

separates multiple liquids based on boiling points, if they are too close, use FRACTIONAL DISTILLATION

Question 13

what is evaporation and what is it dependent on

Answer 13

soluble solid from liquid, evaporates liquid away so that only solid remains, dependent on solubility of solid

Question 14

what is the difference between a miscible and immiscible liquid

Answer 14

miscible is mixable while immiscible is not

Question 15

what is gravimetric analysis

Answer 15

Gravimetric analysis is quantitative + percentage analysis of a mixture, usually in ppm (better form of pctge) (1/100000)

Question 16

what is percentage composition

Answer 16

like the back of an ingredients box, separates contents/elements of a compound into respective ratios and percentages