Many candidates struggle with the AP Chemistry & Study Guides because it focuses heavily on decision-making rather than simple recall. This practice test helps bridge that gap by giving you questions that reflect real exam scenarios. As you go through each section, pay attention to how questions are structured and what they are really asking. Over time, this will improve both your speed and accuracy. Consistent practice combined with review is the key to achieving a strong score.
Updated for 2026: This guide provides a structured approach to help you prepare effectively, understand key concepts, and practice real exam-level questions.
How to Use This Practice Test
- Start by reviewing key concepts before attempting questions
- Take the test in a timed environment
- Analyze your mistakes and revisit weak areas
Why This Practice Test Matters
This practice test is designed to simulate the real exam environment and help you identify knowledge gaps, improve accuracy, and build confidence.
| Exam Name | AP Chemistry Practice Exam |
|---|---|
| Exam Provider | College Board |
| Exam Type | Advanced Placement (AP) High School Exam |
| Total Practice Questions | 120 Practice Questions (Updated for 2026) |
| Coverage Topics | • Atomic Structure & Periodic Trends • Chemical Bonding & Molecular Geometry • Intermolecular Forces & States of Matter • Chemical Reactions & Stoichiometry • Thermodynamics & Kinetics • Equilibrium, Acids & Bases • Electrochemistry & Solutions |
| Question Format | Multiple Choice Questions (MCQs) – Conceptual + Calculation-Based |
| Difficulty Level | Intermediate to Advanced (Aligned with Real AP Chemistry Exam) |
| Study Tips | • Master core formulas and periodic trends • Practice reaction balancing and stoichiometry • Focus on equilibrium and acid-base concepts • Analyze graphs and experimental data carefully |
| Best For | High school students preparing for AP Chemistry exam (Score 4–5 target) |
| Updated | 2026 Latest Version |
1.
Which particle has a negative charge?
A. Proton
B. Neutron
C. Electron
D. Nucleus
Correct Answer: C
Explanation: Electrons carry a negative charge and orbit the nucleus. Protons are positive, neutrons are neutral, and the nucleus contains protons and neutrons.
2.
What is the atomic number?
A. Protons
B. Neutrons
C. Electrons
D. Mass
Correct Answer: A
Explanation: Atomic number equals the number of protons in the nucleus, defining the element’s identity.
3.
Which bond involves sharing electrons?
A. Ionic
B. Covalent
C. Metallic
D. Hydrogen
Correct Answer: B
4.
Which is a strong acid?
A. H₂O
B. HCl
C. NH₃
D. CH₄
Correct Answer: B
5.
Which gas law relates pressure and volume?
A. Charles
B. Boyle
C. Dalton
D. Avogadro
Correct Answer: B
6.
Which is unit of molarity?
A. mol
B. L
C. mol/L
D. g
Correct Answer: C
7.
Which is Avogadro’s number?
A. 6.02×10²³
B. 3.14
C. 9.8
D. 1.6×10⁻¹⁹
Correct Answer: A
8.
Which is limiting reagent?
A. Excess
B. Used first
C. Product
D. Catalyst
Correct Answer: B
9.
Which is exothermic?
A. Absorbs heat
B. Releases heat
C. No heat
D. Constant
Correct Answer: B
10.
Which is pH of neutral solution?
A. 0
B. 7
C. 14
D. 1
Correct Answer: B
11.
Which is oxidation?
A. Gain electrons
B. Lose electrons
C. Gain H
D. Lose O
Correct Answer: B
12.
Which is reduction?
A. Gain electrons
B. Lose electrons
C. Gain O
D. Lose H
Correct Answer: A
13.
Which orbital is spherical?
A. s
B. p
C. d
D. f
Correct Answer: A
14.
Which is strongest IMF?
A. Dispersion
B. Dipole
C. Hydrogen bonding
D. Ionic
Correct Answer: C
15.
Which is catalyst role?
A. Increase ΔH
B. Lower activation energy
C. Stop reaction
D. Increase pressure
Correct Answer: B
16.
Which is equilibrium condition?
A. Forward only
B. Reverse only
C. Equal rates
D. No reaction
Correct Answer: C
17.
Which is buffer?
A. Strong acid
B. Weak acid + base
C. Strong base
D. Salt only
Correct Answer: B
18.
Which is molar mass unit?
A. g/mol
B. mol
C. L
D. atm
Correct Answer: A
19.
Which is gas unit?
A. atm
B. mol
C. g
D. K
Correct Answer: A
20.
Which is spontaneous?
A. ΔG > 0
B. ΔG < 0
C. ΔH > 0
D. ΔS < 0
Correct Answer: B
21.
Which is entropy unit?
A. J/mol·K
B. J
C. mol
D. K
Correct Answer: A
22.
Which is ideal gas law?
A. PV = nRT
B. E = mc²
C. F = ma
D. V = IR
Correct Answer: A
23.
Which is strongest base?
A. HCl
B. NH₃
C. OH⁻
D. H₂O
Correct Answer: C
24.
Which is amphoteric?
A. HCl
B. NaOH
C. H₂O
D. NH₃
Correct Answer: C
25.
Which is colligative property?
A. Density
B. Boiling point elevation
C. Color
D. Reactivity
Correct Answer: B
26.
Which is rate factor?
A. Temperature
B. Color
C. Shape
D. Smell
Correct Answer: A
27.
Which is activation energy?
A. Starting energy
B. Energy barrier
C. Final energy
D. Heat
Correct Answer: B
28.
Which is oxidation number of O?
A. +2
B. −2
C. 0
D. +1
Correct Answer: B
29.
Which is periodic trend?
A. Random
B. Predictable
C. No change
D. Irregular
Correct Answer: B
30.
Which is electronegativity?
A. Atom size
B. Electron attraction
C. Mass
D. Energy
Correct Answer: B
31.
Which quantum number determines orbital shape?
A. n
B. l
C. mₗ
D. mₛ
Correct Answer: B
Explanation: The angular momentum quantum number (l) defines the shape of the orbital (s, p, d, f). Each value corresponds to a different orbital geometry.
32.
Which element has highest ionization energy?
A. Na
B. Mg
C. Al
D. Ne
Correct Answer: D
Explanation: Noble gases like neon have full valence shells, making them very stable and requiring high energy to remove an electron.
33.
Which compound is ionic?
A. CO₂
B. H₂O
C. NaCl
D. CH₄
Correct Answer: C
34.
Which molecule is polar?
A. CO₂
B. CH₄
C. H₂O
D. BF₃
Correct Answer: C
35.
Which has strongest intermolecular forces?
A. CH₄
B. CO₂
C. H₂O
D. O₂
Correct Answer: C
36.
Which process absorbs heat?
A. Freezing
B. Condensation
C. Vaporization
D. Deposition
Correct Answer: C
37.
Which factor increases reaction rate?
A. Lower temp
B. Higher temp
C. Lower concentration
D. No catalyst
Correct Answer: B
38.
Which is equilibrium constant expression?
A. Reactants/products
B. Products/reactants
C. Products only
D. Reactants only
Correct Answer: B
39.
Which shifts equilibrium right?
A. Add product
B. Remove reactant
C. Add reactant
D. Decrease temp (endo)
Correct Answer: C
40.
Which is pH of strong acid?
A. >7
B. <7
C. =7
D. 14
Correct Answer: B
41.
Which is oxidation agent?
A. Loses electrons
B. Gains electrons
C. Gains protons
D. Loses neutrons
Correct Answer: B
42.
Which is reduction agent?
A. Gains electrons
B. Loses electrons
C. Gains oxygen
D. Gains protons
Correct Answer: B
43.
Which law relates volume and temperature?
A. Boyle
B. Charles
C. Dalton
D. Avogadro
Correct Answer: B
44.
Which gas law relates moles and volume?
A. Boyle
B. Charles
C. Dalton
D. Avogadro
Correct Answer: D
45.
Which is colligative property?
A. Density
B. Freezing point depression
C. Color
D. Shape
Correct Answer: B
46.
Which is unit of pressure?
A. mol
B. atm
C. g
D. K
Correct Answer: B
47.
Which is strongest acid?
A. H₂O
B. HCl
C. NH₃
D. CH₄
Correct Answer: B
48.
Which is conjugate base of HCl?
A. H⁺
B. Cl⁻
C. H₂O
D. OH⁻
Correct Answer: B
49.
Which is strongest base?
A. Cl⁻
B. OH⁻
C. H₂O
D. NH₃
Correct Answer: B
50.
Which is amphiprotic?
A. NaCl
B. H₂O
C. HCl
D. NaOH
Correct Answer: B
51.
Which is endothermic reaction?
A. Releases heat
B. Absorbs heat
C. No heat
D. Constant
Correct Answer: B
52.
Which is enthalpy unit?
A. J
B. mol
C. K
D. atm
Correct Answer: A
53.
Which is entropy trend?
A. Decreases disorder
B. Increases disorder
C. No change
D. Constant
Correct Answer: B
54.
Which is spontaneous?
A. ΔG > 0
B. ΔG < 0
C. ΔH > 0
D. ΔS < 0
Correct Answer: B
55.
Which is electrochemistry?
A. Heat reactions
B. Electron transfer
C. Gas laws
D. Solutions
Correct Answer: B
56.
Which is anode?
A. Reduction
B. Oxidation
C. Neutral
D. No reaction
Correct Answer: B
57.
Which is cathode?
A. Oxidation
B. Reduction
C. Neutral
D. No reaction
Correct Answer: B
58.
Which is standard reduction potential?
A. Voltage
B. Pressure
C. Energy
D. Mass
Correct Answer: A
59.
Which is solution concentration?
A. Mass
B. Volume
C. Molarity
D. Density
Correct Answer: C
60.
Which is solvent?
A. Solute
B. Dissolving medium
C. Product
D. Catalyst
Correct Answer: B
61.
Which subshell holds a maximum of 10 electrons?
A. s
B. p
C. d
D. f
Correct Answer: C
Explanation: The d subshell has five orbitals, each holding 2 electrons, for a total of 10 electrons.
62.
Which element has the largest atomic radius?
A. F
B. Cl
C. Br
D. I
Correct Answer: D
Explanation: Atomic radius increases down a group due to added electron shells, making iodine the largest among the options.
63.
Which molecule is nonpolar?
A. NH₃
B. H₂O
C. CO₂
D. SO₂
Correct Answer: C
64.
Which compound has hydrogen bonding?
A. CH₄
B. NH₃
C. CO₂
D. O₂
Correct Answer: B
65.
Which phase change releases heat?
A. Melting
B. Vaporization
C. Freezing
D. Sublimation
Correct Answer: C
66.
Which factor decreases reaction rate?
A. Catalyst
B. Higher temp
C. Lower concentration
D. Increased surface area
Correct Answer: C
67.
Which equilibrium shift occurs when pressure increases?
A. Toward more moles
B. Toward fewer moles
C. No change
D. Random
Correct Answer: B
68.
Which is strong base?
A. NH₃
B. H₂O
C. NaOH
D. CO₂
Correct Answer: C
69.
Which is conjugate acid of NH₃?
A. NH₂⁻
B. NH₄⁺
C. H₂O
D. OH⁻
Correct Answer: B
70.
Which is oxidation number of H in H₂O?
A. +1
B. −1
C. 0
D. +2
Correct Answer: A
71.
Which gas law relates pressure and temperature?
A. Boyle
B. Charles
C. Gay-Lussac
D. Avogadro
Correct Answer: C
72.
Which is colligative property?
A. Color
B. Osmotic pressure
C. Shape
D. Density
Correct Answer: B
73.
Which is enthalpy change for endothermic reaction?
A. Negative
B. Positive
C. Zero
D. Constant
Correct Answer: B
74.
Which increases entropy?
A. Solid → liquid
B. Gas → liquid
C. Solid → solid
D. Liquid → solid
Correct Answer: A
75.
Which is spontaneous condition?
A. ΔG > 0
B. ΔG < 0
C. ΔH > 0
D. ΔS < 0
Correct Answer: B
76.
Which is oxidation at electrode?
A. Cathode
B. Anode
C. Both
D. Neither
Correct Answer: B
77.
Which is reduction at electrode?
A. Anode
B. Cathode
C. Both
D. Neither
Correct Answer: B
78.
Which is galvanic cell?
A. Non-spontaneous
B. Spontaneous
C. No reaction
D. Heat only
Correct Answer: B
79.
Which is electrolyte?
A. Sugar
B. NaCl
C. Ethanol
D. Oil
Correct Answer: B
80.
Which is nonelectrolyte?
A. NaCl
B. HCl
C. Sugar
D. KOH
Correct Answer: C
81.
Which is ideal gas assumption?
A. No volume
B. No attraction
C. Both
D. Neither
Correct Answer: C
82.
Which increases pressure?
A. Increase volume
B. Decrease temperature
C. Increase moles
D. Decrease moles
Correct Answer: C
83.
Which is rate law?
A. Reaction speed
B. Concentration relation
C. Temperature
D. Pressure
Correct Answer: B
84.
Which is first-order reaction unit?
A. s⁻¹
B. M⁻¹s⁻¹
C. M²s⁻¹
D. s
Correct Answer: A
85.
Which is second-order unit?
A. s⁻¹
B. M⁻¹s⁻¹
C. M²s⁻¹
D. s
Correct Answer: B
86.
Which is activation energy?
A. Final energy
B. Barrier energy
C. Starting energy
D. Heat
Correct Answer: B
87.
Which is catalyst effect?
A. Increase ΔH
B. Lower Ea
C. Increase ΔG
D. Stop reaction
Correct Answer: B
88.
Which is acid strength factor?
A. Bond strength
B. Color
C. Shape
D. Mass
Correct Answer: A
89.
Which acid strongest?
A. HF
B. HCl
C. HBr
D. HI
Correct Answer: D
90.
Which base strongest?
A. NH₃
B. H₂O
C. OH⁻
D. Cl⁻
Correct Answer: C
91.
Which orbital can hold a maximum of 2 electrons?
A. s
B. p
C. d
D. f
Correct Answer: A
Explanation: Each orbital can hold a maximum of 2 electrons due to the Pauli exclusion principle. The s subshell contains only one orbital.
92.
Which trend increases across a period?
A. Atomic radius
B. Ionization energy
C. Shielding
D. Atomic mass only
Correct Answer: B
Explanation: Ionization energy increases across a period due to increased nuclear charge pulling electrons closer.
93.
Which bond is strongest?
A. Single
B. Double
C. Triple
D. Ionic
Correct Answer: C
94.
Which molecule has trigonal planar shape?
A. CH₄
B. NH₃
C. BF₃
D. H₂O
Correct Answer: C
95.
Which IMF is weakest?
A. Hydrogen bonding
B. Dipole-dipole
C. Dispersion
D. Ionic
Correct Answer: C
96.
Which phase change absorbs most energy?
A. Melting
B. Freezing
C. Vaporization
D. Condensation
Correct Answer: C
97.
Which factor increases collisions?
A. Lower temp
B. Lower concentration
C. Higher concentration
D. No catalyst
Correct Answer: C
98.
Which equilibrium shifts left?
A. Add reactant
B. Remove product
C. Add product
D. Increase reactant
Correct Answer: C
99.
Which pH is basic?
A. 3
B. 5
C. 7
D. 10
Correct Answer: D
100.
Which species is oxidized?
A. Gains electrons
B. Loses electrons
C. Gains protons
D. Gains neutrons
Correct Answer: B
101.
Which gas law is PV = nRT?
A. Boyle
B. Charles
C. Ideal
D. Dalton
Correct Answer: C
102.
Which increases boiling point?
A. Lower IMF
B. Higher IMF
C. Lower pressure
D. Less mass
Correct Answer: B
103.
Which is conjugate acid of H₂O?
A. OH⁻
B. H₃O⁺
C. H₂
D. O₂
Correct Answer: B
104.
Which is strongest acid?
A. HF
B. HCl
C. HBr
D. HI
Correct Answer: D
105.
Which is buffer solution?
A. Strong acid
B. Strong base
C. Weak acid + conjugate base
D. Salt only
Correct Answer: C
106.
Which process increases entropy?
A. Freezing
B. Condensation
C. Vaporization
D. Deposition
Correct Answer: C
107.
Which condition is spontaneous?
A. ΔG > 0
B. ΔG < 0
C. ΔH > 0
D. ΔS < 0
Correct Answer: B
108.
Which electrode is negative in galvanic cell?
A. Anode
B. Cathode
C. Both
D. None
Correct Answer: A
109.
Which is reduction?
A. Loss electrons
B. Gain electrons
C. Gain oxygen
D. Lose hydrogen
Correct Answer: B
110.
Which solution conducts electricity?
A. Sugar
B. Oil
C. NaCl
D. Alcohol
Correct Answer: C
111.
Which is strong electrolyte?
A. Sugar
B. HCl
C. Alcohol
D. Oil
Correct Answer: B
112.
Which is nonelectrolyte?
A. HCl
B. NaOH
C. Glucose
D. KCl
Correct Answer: C
113.
Which assumption is ideal gas?
A. Volume exists
B. No attractions
C. Strong forces
D. Large volume
Correct Answer: B
114.
Which increases gas pressure?
A. Increase volume
B. Decrease moles
C. Increase temperature
D. Decrease temp
Correct Answer: C
115.
Which is rate constant unit for zero-order?
A. M/s
B. s⁻¹
C. M⁻¹s⁻¹
D. s
Correct Answer: A
116.
Which is activation energy?
A. Starting energy
B. Barrier energy
C. Final energy
D. Heat
Correct Answer: B
117.
Which does catalyst change?
A. ΔH
B. Ea
C. ΔG
D. ΔS
Correct Answer: B
118.
Which acid strongest?
A. HF
B. HCl
C. HBr
D. HI
Correct Answer: D
119.
Which base strongest?
A. NH₃
B. H₂O
C. OH⁻
D. Cl⁻
Correct Answer: C
120.
Which defines equilibrium?
A. No reaction
B. Equal rates
C. Product only
D. Reactant only
Correct Answer: B
Frequently Asked Questions
How accurate is this AP Chemistry & Study Guides practice test compared to the real exam?
Yes, this practice test is designed to reflect real exam patterns, structure, and difficulty level to help you prepare effectively.
What is the best way to use this AP Chemistry & Study Guides test for preparation?
Take the test in a timed setting, review your answers carefully, and focus on improving weak areas after each attempt.
Is it helpful to repeat this AP Chemistry & Study Guides practice test?
Yes, repeating the test helps reinforce concepts, improve accuracy, and build confidence for the actual exam.
Is this AP Chemistry & Study Guides test useful for first-time candidates?
This practice test is suitable for both beginners and retakers who want to improve their understanding and performance.