ATAR Notes: Forum
VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: Studyinghard on June 04, 2010, 05:22:14 pm
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Question 3
How many oxygen atoms are present in 0.0500 mol carbon dioxide?
a) 3.01 x 10^22
b) 6.02 x 10^22
c) 6.02 x 20^23
d) 1.20 x 10^24
Answer says C but im definite its B
Question 16
Acid X and acid Y are both monoprotic weak acids of equal concentration. Acid X is
a stronger acid than acid Y. Which statement about acid X and acid Y is correct?
A. Acid Y is completely ionised in solution.
B. The solution of acid X is less ionised than the solution of acid Y.
C. The solution of acid X has a lower pH than the solution of acid Y.
D. 1 mole of acid Y requires a greater volume of 1.0M NaOH for neutralisation than 1 mole of acid X.
Answer says C for that one but how can one have a lower pH than the other if their concentration is the same. Isnt PH depending on concentration? :S
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I encountered the same problem with question 3. I think it's an error with the answers. Although i'm unsure about question 16.
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Ok.
They are high on 1. I think they are assuming 0.5 mol, then their answer makes sense.
You are certainly right.
16)
If it is a stronger acid it will ionise to a greater extent >> more H ions >> lower pH.
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Ok.
They are high on 1. I think they are assuming 0.5 mol, then their answer makes sense.
You are certainly right.
16)
If it is a stronger acid it will ionise to a greater extent >> more H ions >> lower pH.
What defines "strongness" of an acid?
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Its willingness to donate a proton (H ion).
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oh yeah aha. ffffail mistake this close to an exam
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In the solutions, they used .5mol instead of .05mo so it's a mistake on their behalf. Imo, the chemology exam was crap anyway.
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I didn't do this exam cause the name put me off. Sounds like an exam for chemtards.
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Hamlet sounds like an innocuous little village........ for inbred people....