EST2 HIGH SCHOOL CHEMISTRY
🧪 Quick 20-Question Practice Post
No pictures – just pure chemistry!
Directions: Choose the best answer for each question (A – E). Answers are provided below each question.
1. What is the atomic number of an atom with 12 protons, 12 neutrons, and 12 electrons?
A) 24
B) 12
C) 36
D) 6
E) 14
Answer: B
2. Which type of bond involves the sharing of electron pairs between atoms?
A) Ionic bond
B) Covalent bond
C) Metallic bond
D) Hydrogen bond
E) Van der Waals bond
Answer: B
3. What is the molar mass of water (H₂O)? (H = 1 g/mol, O = 16 g/mol)
A) 17 g/mol
B) 18 g/mol
C) 20 g/mol
D) 16 g/mol
E) 2 g/mol
Answer: B
4. Which of the following is an example of a physical change?
A) Rusting of iron
B) Burning wood
C) Melting ice
D) Cooking an egg
E) Digesting food
Answer: C
5. In the periodic table, elements in the same group have the same number of:
A) Protons
B) Neutrons
C) Valence electrons
D) Electron shells
E) Atomic mass
Answer: C
6. What is the pH of a solution with a hydrogen ion concentration of 1 × 10⁻⁴ M?
A) 2
B) 4
C) 6
D) 8
E) 10
Answer: B
7. Which gas is produced when a metal reacts with an acid?
A) Oxygen
B) Carbon dioxide
C) Nitrogen
D) Hydrogen
E) Chlorine
Answer: D
8. How many moles are in 44 grams of CO₂? (C = 12 g/mol, O = 16 g/mol)
A) 0.5 mol
B) 1.0 mol
C) 1.5 mol
D) 2.0 mol
E) 2.5 mol
Answer: B
9. Which subatomic particle has a negative charge?
A) Proton
B) Neutron
C) Electron
D) Positron
E) Nucleus
Answer: C
10. The process of a solid changing directly to a gas is called:
A) Melting
B) Evaporation
C) Sublimation
D) Condensation
E) Deposition
Answer: C
11. Which of the following is a strong acid?
A) HCl
B) CH₃COOH
C) H₂CO₃
D) H₂O
E) NH₃
Answer: A
12. What is the oxidation number of oxygen in most compounds?
A) -1
B) -2
C) +1
D) +2
E) 0
Answer: B
13. Which equation represents a neutralization reaction?
A) NaOH + HCl → NaCl + H₂O
B) 2H₂ + O₂ → 2H₂O
C) Fe + CuSO₄ → FeSO₄ + Cu
D) CaCO₃ → CaO + CO₂
E) C + O₂ → CO₂
Answer: A
14. The number of valence electrons in an atom of Group 17 element is:
A) 1
B) 2
C) 5
D) 7
E) 8
Answer: D
15. In a chemical reaction, the substances present before the reaction are called:
A) Products
B) Reactants
C) Catalysts
D) Intermediates
E) Inhibitors
Answer: B
16. Which of the following is NOT a state of matter?
A) Solid
B) Liquid
C) Gas
D) Plasma
E) Mineral
Answer: E
17. The law of conservation of mass states that:
A) Mass is created in a reaction
B) Mass is destroyed in a reaction
C) Mass is neither created nor destroyed
D) Mass increases with temperature
E) Mass decreases with pressure
Answer: C
18. What is the shape of a water molecule (H₂O)?
A) Linear
B) Bent / V-shaped
C) Trigonal planar
D) Tetrahedral
E) Octahedral
Answer: B
19. Which factor does NOT affect the rate of a chemical reaction?
A) Temperature
B) Concentration
C) Catalyst
D) Color of the reactants
E) Surface area
Answer: D
20. What is the name of the compound NaCl?
A) Sodium chloride
B) Sodium carbonate
C) Sodium nitrate
D) Sodium sulfate
E) Sodium phosphate
Answer: A
✅ Good luck on your EST2 Chemistry Exam! Study smart!
Posted for practice purposes only.
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