C5e- Gas volume

Question 1

What methods can you use to collect a Gas?

Answer 1

gas syringe
upturned measuring cylinder
upturned burette

Question 2

What are the advantages of using a gas syringe?

Answer 2

can be used for any gas

allows an accurate measurement of the volume of gas produced

Question 3

Describe the upturned cylinder or burette method

Answer 3

a delivery tube is used to bubble gas into an upside down measuring cylinder

Question 4

What are the disadvantages of using the upturned cylinder or burette method?

Answer 4

the method cant be used for gases that dissolve in water

Question 5

How can you measure the mass of gas that a reaction produces?

Answer 5

by carrying out an experiment on a mass balance. as the gas is released the mass disappearing is measured on the balance

Question 6

What are the disadvantages of measuring the mass of a gas?

Answer 6

it releases gas into the room

Question 7

What is rtp?

Answer 7

room temperature (25c) and pressure (1 atmosphere)

Question 8

What is the volume of 1 mole of any gas at rtp?

Answer 8

24dm3

Question 9

What is the equation to find moles?

Answer 9

Moles = Mass ÷ Mr

Question 10

What is the equation linking moles, volume and 24dm3?

Answer 10

Moles = Volume ÷ 24

Question 11

How would you work out the mass of 12dm3 of carbon dioxide (CO2) ?

Answer 11

1) moles = volume ÷ 24
12 ÷ 24 = 0.5
2) moles = mass ÷ mr
0.5 x 44 = 22g