Solution and suspension

Question 1

What are mixtures

Answer 1

Combinations of two or more substances which are not chemically joined together. Each chemical has their own chemical and physical properties

Question 2

What is homogeneous mixture

Answer 2

A mixture that has a uniform appearance throughout

Question 3

Descriptions of homogeneous mixture

Answer 3

The physical and chemical properties are same in every part of the mixture.
They are generally called solutions.
The components are not distinguishable

Question 4

What is a heterogeneous mixture

Answer 4

A mixture that does not have the same composition and appearance throughout

Question 5

Descriptions of heterogeneous mixture

Answer 5

the physical and chemical properties are not the same in every part of the mixture
They have visible diff phases or physical states
The components are distinguishable

Question 6

What is a solution

Answer 6

A solution is a mixture consisting of particles of two or more substances that are distributed evenly throughout

Question 7

What is a solute

Answer 7

It is a substance that is dissolved in another substance

Question 8

What is a solvent

Answer 8

It is a substance that dissolves another substance

Question 9

What is dissolving

Answer 9

Process in which particles of substance separate and spread evenly throughout the mixture

Question 10

How to identify the physical state of the solution based on the state of solute and solvent

Answer 10

The state of the solution is the same as the state of the solvent

Question 11

What is water

Answer 11

It is the universal solvent because there are many substances that can dissolve in it.

Question 12

Characteristics of aqueous solution

Answer 12

• cannot be filtered, no residue left on filter paper when filtration is carried out
• clear and transparent, allows light to pass through
• when left to stand, no particles sink to the bottom of the container

Question 13

Why is there no residue when a solution is filtered

Answer 13

The particles of the solute are so small that they are able to pass through the solution

Question 14

Why is light able to pass through a solution

Answer 14

The particles of the solute are too small to block any light passing through the solution

Question 15

What is a suspension

Answer 15

A suspension is a mixture containing insoluble solid particles suspended in a medium such as air or water

Question 16

The characteristics of a suspension

Answer 16

• A suspension can be filtered by filtration , residue left on filter paper
• it does not allow light to pass through , it scatters light when light is shone on it
• when left to stand, the particles settle to teh bottom of the container

Question 17

Why are there residues left on filter paper when a suspension is filtered

Answer 17

The particles of the solute are too large that they are not able to pass through the pores of the filter paper

Question 18

Why is light unable to pass through a suspension

Answer 18

The particles of the solute are large enough to block any light passing through the suspension

Question 19

What is concentration of solutions

Answer 19

It is a measure of the amount of solute dissolved in a given amount of solvent

Question 20

What are the 3 types of solution

Answer 20

1）dilute

2) concentrated
3) saturated

Question 21

What is the formula of concentration

Answer 21

Concentration (g/cm3) = mass of solute (g) / volume of solvent (cm3)

Question 22

What is solubility

Answer 22

It is the maximum amount of solute which can dissolve in 100g water at fixed temperature

Question 23

The 3 factors that affect solubility

Answer 23

1) type of solvent
2) type of solute
3) temperature

Question 24

Explanation type of solvent

Answer 24

The ability of a solvent to dissolve a given solute.

Question 25

Explanation of type of solute

Answer 25

The ability for a solute to dissolve in a given solvent

Question 26

Explanation of temperature

Answer 26

The effect of hotness and coldness of a solvent.
The solubility of solids and liquids increases with increasing temperature. For gases their solubility decreases with increasing temperature.

Question 27

Define soluble and insoluble

Answer 27

Soluble- when a substance is able to dissolve in a solvent

Insoluble- when a substance is not able to dissolve in a solvent

Question 28

Define solubility curve

Answer 28

A solubility curve is a graph showing the maximum amount of solute that can dissolve in 100g water at a given temperature to form a saturated solution

Question 29

What does it mean when solubility is above the line, on the line, below the line

Answer 29

Above the line- beyond saturated (undissolved solute remains in the solution)

On the line- saturated solution (corresponding to each particular temperature)

Below the line- unsaturated solution (could be dilute or concentrated only)

Question 30

Rate of dissolving of substances

Answer 30

It is a measure of how fast a solute dissolves in a fixed amount of solvent completely

Question 31

Factors affecting rate of dissolving

Answer 31

1) stirring effect
2) amount of solvent
3) particle size
4) temperature

Question 32

Effect of stirring effect

Answer 32

When stirring effect increases, the rate of solubility increases

Question 33

Effect of amount of solvent

Answer 33

When the amount of solvent increases, the rate of solubility increases

Question 34

Effect of particle size

Answer 34

When the particle size decreases, the rate of solubility increases

Question 35

Effect of temperature

Answer 35

When the temperature increases, the rate if solubility of a solute(liquid or solid) increases