MIXTURES: Solutions, Suspensions & Colloids

Question 1

What is a mixture

Answer 1

2 or more substances mixed together but not chemically bonded

Question 2

What is a simple mixture?

Answer 2

mixture of larger particles, easly seperated by hand sorting eg. beans, smarties

Question 3

mixtures can be classified as ?

Answer 3

* sulutions

* suspensions

* colloid

Question 4

what is a solution

Answer 4

is a mixture where one substans is absorbed into another becomes one eg sugar water (homogenous)

Question 5

what is a suspension

Answer 5

mixture where particles are to large to be absorbed by other substance - easily seperated eg water and sand (heterogenous)

Question 6

what is a colloid

Answer 6

a mixture where substances are evenly distrubuted but not absorbed by one another eg water and mayo

Question 7

List 3 differences between colloids and solutions

Answer 7

Sollutions Colloids

* clear & transparent * Milky

* Sollutions let light through * abosrb light

Question 8

What do solutions and colloids have in common?

Answer 8

Both are HOMOGENOUS mixtures

Question 9

What does RATE OF DISSOLVING refer to?

Answer 9

The time it takes a soluble to disolve/absorb in a solvent

eg. time it takes sugar to disolve in water

Question 10

Name the factors that influence the rate of dissolving

Answer 10

1. Temperature
2. Particle size
3. Stirr / Shake
4. Pressure

Question 11

Discuss Temperature

Answer 11

Most Liquid and Solid particles are MORE soluble at higher temperature (disolve easier),

eg. coffee powder disolve easier in boiling water

Gas is more soluble at low temp,

eg. Factory use dam water to cool machines, pump water back into dam the oxygen disolved in the water will escape faster with warm water, dangerous for living organisms (less oxygen in water)

Question 12

Discuss Particle Size

Answer 12

Larger particles take longer to dissolve than smaller particles

Question 13

Discuss Stir / Shake

Answer 13

Particles will dissolve quicker when solution is shaken, stirred or agitated

Question 14

Explain Pressure as rate of disolving

Answer 14

Refers to Dissolving gasses. When a can of cool drink is closed the gas is absorbed in the cool drink,. High Pressure

When the can is opened the gas escapes immediately and the pressure is less/lower and the gas will keep on escaping

Question 15

What is solubility?

Answer 15

When a liquid, gas or solid can disolve into another liquid, gas or solid. eg. H2O

Question 16

Explain Insoluble?

Answer 16

Substance cannot dissolve into another substance

Question 17

Explain Saturation Point

Answer 17

When a solution cannot absorb more of a substance, if added it will sink to the bottom.