Unit 8 progress check: mcq AP Chemistry Quizlet (2024)






5 min readdecember 2, 2021

AP Chemistry🧪


STOP ! ⛔ Before you look at the answers, make sure you gave this practice quiz a try so you can assess your understanding of the concepts covered in Unit 8. Click here for the practice questions: AP Chemistry Unit 8 Multiple Choice Questions.

Unit 8 progress check: mcq AP Chemistry Quizlet (1)

Image courtesy of Pixabay

Facts about the test: The AP Chemistry exam has 60 multiple choice questions and you will be given 1 hour 30 minutes to complete the section. That means it should take you around 15 minutes to complete 10 questions. *The following questions were not written by College Board and although they cover information outlined in the AP Chemistry Course and Exam Description the formatting on the exam may be different.

1.Which of the following correctly identifies why nitric acid is a stronger acid than nitrous acid?

Unit 8 progress check: mcq AP Chemistry Quizlet (2)

A.Nitric acid contains more oxygen atoms, which strengthen the bond to hydrogen.

B. Nitric acid contains more oxygen atoms which weaken the bond to hydrogen.

C. The Ka for nitrous acid is larger than the Ka for nitric acid.

D. Nitrate is a stronger conjugate base than nitrite.

Explanation: Since oxygen is very electronegative, it's able to pull electrons from the O-H bond in the molecule. Nitric acid has more electrons than nitrous acid, so it's able to do this more effectively.

Read this guide about structures of acids and bases!

2.What is the conjugate base of hydrogen phosphate?

A.Phosphate (PO4)

B. Dihydrogen Phosphate (H2PO 4-)

C. Phosphoric Acid (H2PO4)

D. Hydrogen Phosphate (HPO3 2-)

Explanation: We are looking for the conjugate base which means that hydrogen phosphate acted as an acid. Acids donate protons (hydrogen ions). Phosphate is the conjugate base of hydrogen phosphate because it has one less proton.

Read about neutralization reactions here!

3.Which of the following statements regarding methylamine is correct?

Unit 8 progress check: mcq AP Chemistry Quizlet (3)

A.Methyl amine is a Bronsted-Lowry base because it accepts a proton from water.

B. Methyl amine is a Bronsted-Lowry base because it gives a proton to water.

C. Methyl amine is a Arrhenius acid because it creates hydroxide in an aqueous solution.

D. Methyl amine is a Lewis base because it makes hydroxide in an aqueous solution.

Explanation: Bronsted Lowry bases accept protons and Bronsted Lowry acids donate protons. Methyl amine accepts a proton from water and is therefore a base.

Read this introduction to Bronsted-Lowry bases!

4.In an aqueous solution, the hydrogen ion concentration is 2.4x10^-3 M. What is the pOH?

Unit 8 progress check: mcq AP Chemistry Quizlet (4)


B. 11.38

C. 2.40

D. 11.60


Unit 8 progress check: mcq AP Chemistry Quizlet (5)

Review using this guide on pH and pOH!

5.What is the pH of a 0.00034 M solution of sodium hydroxide (NaOH)?


B. 10.53

C. 2.47

D. 11.53


Unit 8 progress check: mcq AP Chemistry Quizlet (6)

Review using this guide on pH and pOH!

6. What is the pH of a 0.55 M solution of acetic acid?

Unit 8 progress check: mcq AP Chemistry Quizlet (7)


B. 5.00

C. 11.50

D. 2.50


Unit 8 progress check: mcq AP Chemistry Quizlet (8)

Read this guide on Weak Acids!

7.What is the net ionic equation for the reaction between hydrofluoric acid and potassium hydroxide?

Unit 8 progress check: mcq AP Chemistry Quizlet (9)

Correct Answer: A.

Explanation: Since hydrofluoric acid is a weak acid, we know that it does not completely ionize in solution. The only spectator ion is potassium and it is, therefore, removed from the equation.

Review using this video on net ionic equations!

8.Which of the following has the highest pH?

A.Solution containing equimolar amounts of NaOH and HCl

B. 1.0 M solution of HCl

C. 1.0 M solution of NaOH

D. 1.0 M solution of HF (Ka = 0.00018)

Explanation: The solution containing sodium hydroxide has the highest pH. Sodium hydroxide is a strong base and therefore makes the solution's pH high.

9.Which of the following combinations of substances is a buffer solution?

Unit 8 progress check: mcq AP Chemistry Quizlet (10)

Correct Answer: D.

Read this introduction to buffers!

10.25.0 mL of 1.0 M acetic acid is mixed with 25.0 mL of 1.0 M sodium hydroxide. What is the resulting pH?

A.pH = 7

B. pH > 7

C. pH < 7

D. pH = 0

Explanation: This reaction is at it's equivalence point. The pH at equivalence point of a weak acid- strong base titration is above 7.

Read this guide on acid-base titrations!

11.A solution is prepared such that the concentration of formic acid is 0.024 M and the concentration of sodium formate is 0.103 M. What is the pH of the reaction mixture?

Unit 8 progress check: mcq AP Chemistry Quizlet (11)


B. 9.62

C. 1.62

D. 4.38


Unit 8 progress check: mcq AP Chemistry Quizlet (12)

Read this guide on the Henderson-Hasselbalch Equation!

12.Which of the following salts is the most acidic?

Unit 8 progress check: mcq AP Chemistry Quizlet (13)

Correct Answer: B.

Explanation: The only solution that contains an acidic proton is the ammonium chloride. When it dissociates in solution, the ammonium ion decreases the pH of the mixture. Read this guide on pH!

13.Which of the following would be the best indicator to observe a neutralization reaction between KOH and HBr?

A.Methyl Orange (pKa = 4.95

B. Phenolphthalein (pKa = 9.4)

C. Thymol Blue (pKa = 1.65)

D. p-Nitrophenol (pKa = 7.2)

Explanation: The most appropriate indicator is the one with a pKa closest to the desired pH. Therefore since this is a strong acid strong base titration, the desired pH is closest to 7.Read this guide on acid-base titrations!

14.What is the concentration of 1.55 M NaOH is required to titrate 24 mL of a 0.75 M HI solution?

A.11.6 mL

B. 49.6 mL

C. 11.6 L

D. 49.6 L

Explanation: NaOH and HI react in a 1 mol: 1 mol ratio. Using the titration equation one can determine the volume of NaOH required to titrate the solution. Read this guide on acid-base titrations!

15.When a small amount of HCl is added to a solution containing equimolar amounts of NaF and HF, which of the following statements is true?

A.[NaF] < [HF] because the HCl reacts with the conjugate base.

B. [NaF] > [HF] because the HCl reacts with the conjugate base.

C. [NaF] < [HF] because the HCl reacts with the conjugate acid.

D. [NaF] > [HF] because the HCl reacts with the conjugate acid.

Explanation: HCl, a strong acid, reacts with NaF. This decreases the concentration of the NaF while increasing the concentration of HF. The fluoride ion is the conjugate base of HF.

Read this introduction to acid-base reactions!

What can we help you do now?

  • 🔍Check out all of the resources for AP Chem Unit 9
  • 🦘Jump to AP Chem Unit 9 Multiple Choice Questions
  • 🤝Connect with other students studying AP Chem with Hours

Was this guide helpful?

Unit 8 progress check: mcq AP Chemistry Quizlet (2024)


How many questions do you need to get right to pass the AP Chemistry exam? ›

Students can get a raw score of a 50 (that's 50 questions correct out of 75) and still get a 5 on the AP Chemistry exam. Remember a score of a 3 is passing, a 4 is great, and a 5 is the highest score. Multiple choice only covers half of the test.

Which of the following would create a good buffer when dissolved in formic acid? ›

NH₃ - This is ammonia, which is a weak base. When ammonia is dissolved in formic acid, it reacts to form the formate ion (HCOO⁻) and ammonium ion (NH₄⁺). The formate ion acts as the conjugate base of formic acid, making this option suitable for creating a buffer solution.

How long is AP Chem MCQ? ›

What's on the AP Chemistry Exam?
TimingNumber of Questions
Section 190 minutes60 multiple choice questions
Section 2105 minutes3 long-form free-response questions 4 short-form free-response questions

What percent is a 5 on AP Chem? ›

While the exact percentage needed for a 5 can vary each year, you can estimate that you'll generally need to score around 65% to 75% of the total possible points to earn a 5 on the AP Chemistry exam.

What's a good MCQ score for AP Chem? ›

AP Chemistry Scoring Table
AP Chemistry ScoreQualificationCollege Grade Equivalent
5Extremely well qualifiedA+ or A
4Very well qualifiedA-, B+, or B
3QualifiedB-, C+, or C
2Possibly Qualified
1 more row

What is the shortest AP exam? ›

Hey there! I'd be happy to help you with your question about AP exams. The shortest AP exams are typically those without essays, and as of the last few years, the AP Physics C: Mechanics exam has been the briefest. It's only 90 minutes long, consisting of multiple-choice questions followed by free-response questions.

Is a 3 on AP Chem good? ›

Scores of 3, 4, or 5 are considered “passing” scores on the AP® Chemistry Exam. The College Board describes a 3 as 'qualified,' 4 as 'well qualified,' and a 5 as 'extremely well qualified. ' Scores of 3 or higher may qualify you for college credit, but many colleges and universities will only accept 4's or 5's.

Do buffers use strong or weak acids? ›

A mixture of a weak acid and its conjugate base (or a mixture of a weak base and its conjugate acid) is called a buffer solution, or a buffer.

Do buffers absorb excess H+ or OH? ›

Buffers readily absorb excess H+ or OH, keeping the pH of the body carefully maintained in the narrow range required for survival. Maintaining a constant blood pH is critical to a person's well-being.

What pH would formic acid buffer? ›

It would be most useful for creating a buffered solution at pH 4. The pH of a buffer made with formic acid and the formate ion at equal ratios is 3.75.

Is the AP Chem MCQ hard? ›

AP Chemistry multiple-choice questions can be quite challenging as they test both your conceptual understanding and your ability to solve problems with calculations. The exam is designed to assess your grasp of the chemistry principles you've learned throughout the school year.

Are calculators allowed on AP Chem MCQ? ›

Calculators are allowed only for some or all parts of AP Exams in these subjects: Biology, Calculus (AB/BC), Chemistry, Physics 1, Physics 2, Physics C: Mechanics, Physics C: Electricity and Magnetism, and Statistics.

Is AP Chem test easy? ›

AP Chemistry consistently ranks among the most difficult AP courses. The course covers many topics, while prioritizing essential scientific practices. AP Chemistry test data overlooks factors like the quality of teachers and schools. The AP Chemistry exam comprises both multiple-choice and written sections.

How many questions do you have to get right to pass an AP exam? ›

A passing score is a three. Who scores the sections? The multiple choice sections are scored by computer. The free response sections are scored by teachers during the annual AP Reading conference held each June.

What percent correct is a 3 on an AP exam? ›

As a general guide, though, you can consider roughly more than 70% correct as being in the 5 range, 50-69% for a score of 4, 40-49% for a score of 3, 30-39% for a 2, and below 30% would likely be a 1. Again, these ranges are approximations and can vary by subject and by year.

What percent of questions do you need to get right to get a 5 on AP Calc BC? ›

Since you only need to get about 60% of available points to score a 5 on either AP Calculus exam, and since you have ample time on all sections, you can strategize the exam differently than you would almost any classroom test.

What percent do you need to get on an AP exam to get a 5? ›

Usually, a 70 to 75 percent out of 100 translates to a 5. However, there are some exams that are exceptions to this rule of thumb. The AP Grades that are reported to students, high schools, colleges, and universities in July are on AP's five-point scale: 5: Extremely well qualified.

Top Articles
Latest Posts
Article information

Author: Rueben Jacobs

Last Updated:

Views: 5746

Rating: 4.7 / 5 (57 voted)

Reviews: 88% of readers found this page helpful

Author information

Name: Rueben Jacobs

Birthday: 1999-03-14

Address: 951 Caterina Walk, Schambergerside, CA 67667-0896

Phone: +6881806848632

Job: Internal Education Planner

Hobby: Candle making, Cabaret, Poi, Gambling, Rock climbing, Wood carving, Computer programming

Introduction: My name is Rueben Jacobs, I am a cooperative, beautiful, kind, comfortable, glamorous, open, magnificent person who loves writing and wants to share my knowledge and understanding with you.