Experimental Design

Question 1

apparatus to measure time

Answer 1

digital stopwatch

Question 2

apparatus to measure temperature

Answer 2

thermometer

Question 3

apparatus to measure mass

Answer 3

electronic balance

Question 4

4 apparatus to measure volume of solution

Answer 4

burette, pipette, measuring cylinder, volumetric flask

Question 5

apparatus to measure volume of gas

Answer 5

gas syringe

Question 6

smallest division of time taken

Answer 6

± 0.01

Question 7

what is the common mistake for time taken during practical

Answer 7

time taken is to be recorded to the nearest whole number

Question 8

smallest division of temperature

Answer 8

nearest 0.5°C

Question 9

smallest division of mass

Answer 9

± 0.01g

Question 10

smallest division of burette

Answer 10

nearest 0.05 cm³

Question 11

smallest division of pipette

Answer 11

fixed volumes (eg 10.0cm³ , 25.0cm³)

Question 12

pipette is measured in how many decimal points

Answer 12

1

Question 13

burette is measured in how many decimal points

Answer 13

2

Question 14

smallest division of measuring cylinder

Answer 14

nearest 0.5 cm³

Question 15

smallest division of volumetric flask

Answer 15

fixed volumes (eg 100cm³, 250 cm³)

Question 16

volumetric flask is measured in how many decimal points

Answer 16

nil. it sould be a whole number

Question 17

how to measure gases that are denser of air

Answer 17

since density of gas is roughly proportional to its relative molecular mass, any gas with Mr heavier than 29 will be denser than air

Question 18

more dense definition

Answer 18

it will sink in water as it has a higher ratio of mass to volume, meaning it contains more matter packed into the same space

Question 19

Mr of air

Answer 19

29

Question 20

4 methods of collection of gases

Answer 20

downward delivery, upward delivery, water displacement, collection using gas syringe

Question 21

downward delivery are suited for what kind of gas

Answer 21

only for gases that are denser than air

Question 22

5 gases that can be obtained via downward delivery

Answer 22

CO2, SO2, Cl2, O2, HCl

Question 23

upward delivery are suited for what kind of gas

Answer 23

only for gases that are less dense than air

Question 24

water displacement are suited for what kind of gas

Answer 24

only for gases that are insoluble or slightly soluble in water

Question 25

collection using gas syringe are suited for what kind of gas

Answer 25

suitable for all gases

Question 26

3 gases that can be obtained via upward delivery

Answer 26

H2, N2, NH3

Question 27

4 gases that can be obtained via water displacement

Answer 27

CO2, N2, O2, H2

Question 28

3 drying agents

Answer 28

fused/anhydrous calcium chloride, calcium oxide (quicklime), concentrated sulfuric acid

Question 29

fused/anhydrous calcium chloride are suited for what kind of gas

Answer 29

can be used for most gases except for NH3

Question 30

calcium oxide (quicklime) are suited for what kind of gas

Answer 30

can be used for alkaline gases and all neutral gases but not acidic gases

Question 31

alkaline gas example

Answer 31

NH3

Question 32

2 neutral gases examples

Answer 32

O2 and H2

Question 33

acidic gases example

Answer 33

CO2

Question 34

concentrated sulfuric acid are suited for what kind of gas

Answer 34

can be used for acidic gases and neutral gases but not alkaline gases

Question 35

which is the SI unit for temperature? s, K, g, °C

Answer 35

K

Question 36

Gas P can be collected using the apparatus shown. Based on the diagram only, what can you infer about gas P?

Answer 36

A

Question 37

Answer 37

B

Question 38

A student is provided with two drying agents: concentrated sulfuric acid and calcium oxide. Which method should he use to collect a sample of dry ammonia? [Mr: NH3, 17]

Answer 38

D

Question 39

Gas X can be purified by passing through liquid Y. Which of the following shows the most suitable arrangement of apparatus for the experiment?

Answer 39

D

Question 40

Answer 40

Question 41

name the method of gas collection

Answer 41

water displacement

Question 42

from the list of gases listed, select the gases which can be collected using water displacement ammonia, chlorine, carbon dioxide, hydrogen, hydrogen chloride, sulfur dioxide explain

Answer 42

hydrogen and carbon dioxide The gases are hardly soluble in water