AP® Chemistry Multiple Choice Practice Problems
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- Опубліковано 11 лип 2024
- These practice problems for AP® Chemistry will help you study for the test, and get a five!
www.tdwscience.com/apchem These multiple choice problems are written to be as close as possible to the real AP® Exam. They cover all of the usual topics: stoichiometry, gas laws, kinetics, equilibrium, acids and bases, thermodynamics, thermochemistry, electrochemistry, le chatter's principle, Gibbs free energy, entropy, and enthalpy. For each problem, we talk about the tips and tricks to solve it. We also work through strategies to outsmart the test, and see how to tackle concepts more quickly and efficiently. I hope this helps you ace the test and get a five!
Legal note: AP® Chemistry is a trademark owned by the College Board, which is not affiliated with, and does not endorse, this video or any associated content.
00:00 Introduction
1:05 Question 1
3:46 Question 2
7:58 Question 3
13:04 Question 4
14:53 Question 5
21:57 Question 6
21:52 Question 7
29:12 Question 8
33:03 Question 9
38:34 Question 10
42:19 Question 11
44:44 Question 12
48:20 Question 13
55:16 Question 14
58:18 Question 15
1:02:45 Question 16
1:06:55 Question 17
1:10:01 Question 18
1:16:34 Questions 19 and 20
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NO!!! the endpoint is when the indicator changes color, NOT when the moles of analyte and titrant are equal.
the equivalence point is when
moles titrant added = moles analyte initially present
such that only the salt remains
Thanks for pointing this out. I literally can't believe this slipped by me, when I'm always emphasizing the difference to students. I added a notation in the video description to clarify.
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I have question are you defining your system as magnesium, water & the container so that the heat transfer is internal and there is no external work done on a system???
Yes
@@tdewitt451 thanks for clarification.
watching this right before my exam
I hope you kill it. Best of luck.
Since there are a total of 60 questions in the multiple-choice, will you be adding more multiple-choice problems like these in the upcoming days?
I will be! Some will go here, and others will go on my website, so be sure to join the mailing list to get notified. tdwscience.com/apchem
For question 19 shouldn’t you switch the -0.13 since the oxidation equation is different it’s reversed which makes it positive 0.13
Great question! So you see how we subtract the negative here? That makes it positive 0.13. You have two choices, and they’re both valid. You can either subtract the anode value (without flipping it), or you can reverse the oxidation equation and flip the value. They will give you the same math. Does that make sense?
@@tdewitt451 yes!! It does. Thank you very much😊
I have a question on number 2, why is C not right? HNO3’s conjugate base is NO3^-1, so it does have a conjugate base and there is a proton being taken away?
It’s a really good point, and I think I’ll change this question in the future. This was based on a College Board question where they implied that Brønsted-Lowry conjugates are best used to describe pairs for weak acids and bases. This was one of those “both are right, but one is more right” kind of questions. But it’s a bad question and I’ll change it.
Hi. For problem 18, why is the q for magnesium not -420? Shouldn't it be negative since magnesium is losing heat in the reaction?
Yes, you could do it that way. But since you’re solving for the mass of the Mg, and you know mass won’t be negative, you don’t really have to worry about signs here. But yes technically qMg is negative and qH2O is positive. But again all we care about here is the magnitude.
@@tdewitt451 thank you so much for the clarification!
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Will the ap exam provide periodic table with names of elements?
That is a good point. The periodic table on the AP test will not have element names.
1:22:15
T-minus 2 hours until exam, good luck everyone!
can someone please help me understand question 1? aren't there more moles of Fe making S the limiting reactant instead?
You have 10 grams of each. Take 10 grams and divide it by the molar mass of iron. What is that number? That is the number of moles of iron. Divide 10 grams by the molar mass of sulfur. That is the moles of sulfur. Which number is bigger?
@@tdewitt451 ohh!!! that makes a lot of sense, i flipped the numbers when dividing. thank you so much!!!!
Confused on 2. Why does it matter if the nitrate ion won’t actually accept a hydrogen ion. It’s still a conjugate base by definition, unless all strong acids and bases don’t have conjugates.
That’s the point. Strong acids don’t have conjugate bases. Conjugate bases need to be able to re-accept a proton and form the acid again. The nitrate ion can’t do this.
Good luck on the AP Exam today everyone!
Hi! I wanna know how was your ap exam, I'm a junior and takes ap chem too, I'm looking for videos and peoples comment for any suggestion. I wanna know how you guys do last year :)
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Can u plz provide pdf file of all these questions..
Yes, go to my website www.tdwscience.com/apchem