AP Chem Unit 1 Hard Practice MCQ
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AP Chem Unit 1 Hard Practice MCQ

Master the challenging concepts of AP Chemistry Unit 1 with these rigorous multiple-choice questions. Test your understanding and prepare for exam success.

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Unit 1: Matter and Its Interactions

Matter and Measurement

1. Which of the following measurements has the largest uncertainty?

ap chem unit 1 hard practice mcq

(A) 25.00 mL
(B) 25.0 mL
(C) 25 mL
(D) 2 × 10^2 mL

2. A solution has a density of 1.25 g/mL. What is the mass of 500 mL of this solution?

(A) 500 g
(B) 625 g
(C) 1250 g
(D) 2500 g

Stoichiometry

3. In the reaction 2H2O → 2H2 + O2, how many moles of H2O are needed to produce 0.5 mole of H2?

(A) 0.25
(B) 0.5
(C) 1
(D) 2

AP Chem Unit 1 Hard Practice MCQ

4. A reaction between 2.0 moles of NaOH and 2.0 moles of HCl produces salt and water. Which reactant is limiting?

(A) NaOH
(B) HCl
(C) salt
(D) water

Atomic Structure and Properties

5. Which of the following is NOT a fundamental particle of an atom?

(A) Proton
(B) Neutron
(C) Electron
(D) Quark

6. The atomic number of an element represents the number of:

(A) protons
(B) neutrons
(C) electrons
(D) orbitals

7. Which of the following elements has the highest first ionization energy?

(A) Li
(B) C
(C) N
(D) O

Unit 1: Matter and Its Interactions

Periodic Properties

8. The atomic radius generally:

(A) increases down a group
(B) decreases down a group
(C) increases across a period
(D) decreases across a period

9. Which of the following elements is most electronegative?

(A) F
(B) Cl
(C) Br
(D) I

10. The noble gases are characterized by:

(A) high reactivity
(B) high ionization energy
(C) low electronegativity
(D) all of the above

Chemical Reactions

11. A reaction is exothermic if:

(A) heat is released
(B) heat is absorbed
(C) the reactants are in lower energy states than the products
(D) the reactants have more potential energy than the products

12. Which of the following is NOT a factor that affects the rate of a chemical reaction?

(A) temperature
(B) concentration
(C) catalyst
(D) activation energy

Solutions

13. A 1.0 M solution of NaCl contains:

(A) 1 mole of NaCl per liter of solution
(B) 58.44 g of NaCl per liter of solution
(C) 1 mol of NaCl per kg of water
(D) 58.44 g of NaCl per kg of water

14. Which of the following is a colligative property?

(A) boiling point elevation
(B) solubility
(C) density
(D) molarity

15. A solution with a pH of 7 is:

(A) acidic
(B) basic
(C) neutral
(D) concentrated

Acids, Bases, and Salts

16. The pH of a 0.1 M solution of HCl is:

(A) 1
(B) 2
(C) 7
(D) 14

17. Which of the following salts is soluble in water?

(A) CaCO3
(B) PbCl2
(C) BaSO4
(D) AgCl

18. A buffer solution:

(A) resists changes in pH
(B) is made up of an acidic and basic component
(C) has a pH of 0 or 14
(D) has a constant pOH

19. Which of the following ions is a spectator ion in the reaction of NaOH and HCl?

(A) Na+
(B) OH-
(C) H+
(D) Cl-

20. A titration is used to: