WorksheetsUnit 2 (c) - Gases in the Atmosphere
Total questions: 10
Worksheet time: 22mins
What happens to limewater when carbon dioxide is bubbled through it?
Turns from white to blue.
Turns from colourless to milky.
The carbon dioxide bubbles give a squeaky pop sound.
It freezes.
What colour does sulfur burn in oxygen?
Blue
White
Orange
Lilac
Which gas makes up approximately 0.9% of dry, unpolluted air?
Carbon dioxide
Neon
Hydrogen
Argon
What is produced in the thermal decomposition of copper(II) carbonate?
CuO + H2O
Cu + CO2
CuO + CO2
Cu + O2
What is the appearance of copper oxide?
White solid
Colourless gas
Blue-green liquid
Black solid
Which of the following has basic character?
Nitrogen oxide
Sulfur dioxide
Magnesium oxide
Carbon dioxide
How do we solve for the percentage change?
original quantity - new quantity
increase ÷ original quantity
decrease ÷ original quantity
change ÷ original quantity
NON-CHEMISTRY % CHANGE QUESTION.
In a wetland, 400 birds are observed in 2018 and 450 birds are observed in 2019. Find the percentage change of the no. of birds.
decreased by 12.5%
increased by 50
increased by 12.5%
increased by 50%
NON-CHEMISTRY % CHANGE QUESTION.
Find the percentage change in the following price reduction:
£45 to £32.85
27%
73%
38%
62%
NON-CHEMISTRY % CHANGE QUESTION.
The regular price of a scooter is $65.50. It is on sale for $52.40. What is the percent decrease from the regular price to the sale price of the scooter?
35%
30%
25%
20%
