Master chemistry concepts through interactive quizzes covering atomic structure, chemical bonds, reactions, stoichiometry, acids and bases, and thermodynamics. Each question includes detailed explanations of chemical principles and problem-solving methods. Perfect for AP Chemistry prep, college general chemistry, or homework practice.
8 sample questions. Expand to see answers and explanations.
1. What is the electron configuration of oxygen (atomic number 8)?
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Answer
1s² 2s² 2p⁴
Explanation
Oxygen has 8 electrons: 2 in the first shell (1s²), 2 in the 2s orbital (2s²), and 4 in the 2p orbitals (2p⁴).
Type: multiple choice
2. Which type of bond forms when electrons are shared between atoms?
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Answer
Covalent bond
Explanation
Covalent bonds form when two atoms share one or more pairs of electrons, typically between nonmetals.
Type: multiple choice
3. If 2 moles of hydrogen react with 1 mole of oxygen, how many moles of water form?
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Answer
2 moles
Explanation
The balanced equation 2H₂ + O₂ → 2H₂O shows that 2 moles of water are produced from 2 moles of hydrogen and 1 mole of oxygen.
Type: multiple choice
4. True or False: Catalysts are consumed in chemical reactions.
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Answer
False
Explanation
False. Catalysts speed up reactions by lowering activation energy but are NOT consumed. They can be reused.
Type: true false
5. What is the pH of a neutral solution at 25°C?
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Answer
7
Explanation
At 25°C, pure water has pH 7 (neutral). pH < 7 is acidic, pH > 7 is basic. pH = -log[H⁺].
Type: multiple choice
6. Which gas law relates pressure and volume at constant temperature?
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Answer
Boyle's Law (P₁V₁ = P₂V₂)
Explanation
Boyle's Law states that pressure and volume are inversely proportional when temperature is held constant. Doubling pressure halves volume.
Type: multiple choice
7. Fill in the blank: An atom that loses electrons becomes a _____ ion.
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Answer
Positive (cation)
Explanation
Losing electrons (negative charges) makes the atom positively charged. Metals typically form cations.
Type: fill in blank
8. What is the molar mass of H₂O (water)?
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Answer
18 g/mol
Explanation
H₂O has 2 hydrogen atoms (2 × 1 g/mol = 2) + 1 oxygen atom (16 g/mol) = 18 g/mol total.
Type: multiple choice
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