CHAPTER 1 CHEMISTRY

Question 1

What apparatus(s) uses accurately/ exactly?

Answer 1

pipette & burette

Question 2

What apparatus(s) uses approximately/ nearest?

Answer 2

measuring cylinder & beaker

Question 3

What is pipette rounded to?

Answer 3

(1dp): eg. 25.0cm(3)

Question 4

What is burette rounded to?

Answer 4

(2dp): eg. 25.00cm(3)

Question 5

What is measuring cylinder rounded to?

Answer 5

nearest cm(3)

Question 6

What is beaker rounded to?

Answer 6

approximate volume of 100cm(3) or 250cm(3).

Question 7

If gas is stated, what apparatus is used?

Answer 7

gas syringe.

Question 8

What apparatus is used to find mass?

Answer 8

mass balance

Question 9

What is definition of denser?

Answer 9

heavier than oxygen

Question 10

What delivery is used for denser?

Answer 10

downward delivery.

Question 11

What is the definition of less dense?

Answer 11

lighter than oxygen.

Question 12

What delivery is used for less dense?

Answer 12

upward delivery.

Question 13

What is considered a pure substance?

Answer 13

element/ compound.

Question 14

State the features of a pure substance

Answer 14

• has fixed bp & mp.
• chromatography: 1 spot.

Question 15

State the features of an impure/ mixture

Answer 15

• melts below mp/ over a range of temps.
• boils above bp/ over a range of temps.
• chromatography: >1 spot.

Question 16

State the purification analysis methods

Answer 16

• filtration.
• crystallization/ evaporation.
• simple distillation.
• fractional distillation.
• chromatography.

Question 17

What is the filtration technique?

Answer 17

separate insoluble from mixture.

Question 18

What is the crystallization/ evaporation technique?

Answer 18

separate soluble solid from mixture.

Question 19

What is the simple distillation technique?

Answer 19

separate liquid solvent from a mixture.

Question 20

What is the fractional distillation technique?

Answer 20

separate miscible liquids from different boiling points.