Chap 3 ( Sec 1 Topic )

Question 1

What is an element?

Answer 1

It is the basic building block of living and non-living matter.

Question 2

what consists in a compound?

Answer 2

Two or more elements chemically combined together.

Question 3

do compounds have the same properties as their constituent elements?

Answer 3

compounds have different properties from the elements they are made out of.

Question 4

What is a mixture?

Answer 4

it is two or more elements or compounds physically combined together.

Question 5

How is a compound formed?

Answer 5

a chemical reaction.

Question 6

How are mixtures formed?

Answer 6

a physical change.

Question 7

proportions of constituents in compounds

Answer 7

elements that make up a compound are always combined in a fixed proportion in mass.

Question 8

proportions of constituents in mixtures

Answer 8

not fixed

Question 9

Do mixtures have the same properties as it’s constituents?

Answer 9

Same properties as the substance as it is made of.

Question 10

separation of constituents of mixtures are…

Answer 10

easy

Question 11

separation of constituents of compounds are…

Answer 11

not easy. they cannot be broken down by physical methods/ can only be broken down by chemical processes.

Question 12

what is a solution?

Answer 12

a mixture containing a solute dissolved in a solvent.

Question 13

What is a solvent?

Answer 13

the substance that dissolves the solute

Question 14

What is a solute?

Answer 14

the substance that dissolves in a solvent.

Question 15

*Factors that affect the rate of dissolving ( how fast )

Answer 15

size of solute particles.
temperature of solvent.
rate of stirring.

Question 16

what is solubility

Answer 16

it is how well a solute dissolves in a fixed amount of a particular solvent. ( how much )

Question 17

what is a suspension?

Answer 17

it is a mixture containing insoluble substance in a solvent.

Question 18

**What is the appearance of a solution?

Answer 18

• particles of the solute cannot be seen
• the solute does not settle to form solid deposits
• light can pass through fully

Question 19

**What is the appearance of a suspension?

Answer 19

• insoluble substances can be seen
  -insoluble deposits can settle to form solid deposits
• light cannot pass through fully.

Question 20

**Does a solute in solutions and suspensions settle to form solid deposits?

Answer 20

insoluble solutes in suspensions settle to form solid deposits
while solute in solutions do not.

Question 21

how do you know if an element has the same chemical properties as one another.

Answer 21

Elements in the same group have similar chemical properties and will undergo the same type of chemical reaction.

Question 22

*Factors that affect the rate of solubility

Answer 22

• increase temperature
• change type of solvent
• change type of solute

Question 23

What is an alloy?
list some examples

Answer 23

An alloy is a mixture of elements only.
it is a mixture of a metal and one or more other elements.
eg; brass(copper and zinc), steel(iron and carbon), pewter (tin, copper and silver)
alloys are not chemically combined.

Question 24

What is a saturated solution?

Answer 24

a solution in which the maximum mass of solute is dissolved in it at a particular temperature.
No more solute can be dissolved in the solvent.

Question 25

**what affects the rate of solubility?

Answer 25

temperature
type of solute
type of solvent