-
We need your support!
We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
Click here to Donate Now (View Announcement)
chem help (nov 09)
- Thread starter hanna67
- Start date
- Messages
- 5
- Reaction score
- 0
- Points
- 0
lol that is link for physics :mrgreen:
anyhow, lets move on
no 31. =
31 Which object is least likely to contain aluminium?
A a bicycle frame
B a hammer =correct ans
C a saucepan
D an aeroplane body
why= first aluminium is a pure metal which means it is ductile and malleable. you dont want the hammer to bend when you pin a nail do u? you want the nail or any other metal to bend. so for this you need an alloy- very strong metal. therefore hammer is least likely to contain aluminium (which is a pure metal).
no 34. =
34 A new planet has been discovered and its atmosphere has been analysed.
The table shows the composition of the atmosphere.
gas percentage by volume
carbon dioxide 4
nitrogen 72
oxygen 24
Which gases are present in the atmosphere of the planet in a higher percentage than they are in the Earth’s atmosphere?
A carbon dioxide and oxygen = correct ans
B carbon dioxide only
C nitrogen and oxygen
D nitrogen only
why= because nitrogen in air = 78%
oxygen in air = 21%
rest which is mainly argon and a lil carbon dioxide= 1%
therefore you can see that oxygen is 3% higher while carbondioxide is also 3% higher while other got lower.
i hope this helped
n sorry that was too long! pls correct me if im wrong anyone... im not all sure if its right..
gd luck for chem exam!!
anyhow, lets move on
no 31. =
31 Which object is least likely to contain aluminium?
A a bicycle frame
B a hammer =correct ans
C a saucepan
D an aeroplane body
why= first aluminium is a pure metal which means it is ductile and malleable. you dont want the hammer to bend when you pin a nail do u? you want the nail or any other metal to bend. so for this you need an alloy- very strong metal. therefore hammer is least likely to contain aluminium (which is a pure metal).
no 34. =
34 A new planet has been discovered and its atmosphere has been analysed.
The table shows the composition of the atmosphere.
gas percentage by volume
carbon dioxide 4
nitrogen 72
oxygen 24
Which gases are present in the atmosphere of the planet in a higher percentage than they are in the Earth’s atmosphere?
A carbon dioxide and oxygen = correct ans
B carbon dioxide only
C nitrogen and oxygen
D nitrogen only
why= because nitrogen in air = 78%
oxygen in air = 21%
rest which is mainly argon and a lil carbon dioxide= 1%
therefore you can see that oxygen is 3% higher while carbondioxide is also 3% higher while other got lower.
i hope this helped
n sorry that was too long! pls correct me if im wrong anyone... im not all sure if its right..gd luck for chem exam!!