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Dr Doe's chemistry quiz: Can you ace this challenge?

Quick, free quiz to test your chemistry knowledge. Instant results - try the Dr Doe chemistry test.

Editorial: Review CompletedCreated By: Vick UmadatUpdated Aug 27, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Dr. Does chemistry quiz announcement with paper art elements on a dark blue background

Use Dr Doe's chemistry quiz to check how well you know elements, reactions, equations, and simple lab skills. Get instant results and helpful tips as you go. For extra practice, work through the basic chemistry quiz, review symbols with the first 36 elements quiz, or try the Dr Doe chemical quiz.

Which subatomic particle determines the atomic number of an element?
Electron
Proton - Explanation: Atomic number equals the number of protons in the nucleus.
Neutron
Positron
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Avogadro's number represents the number of entities in exactly one mole.
False
True - Explanation: 1 mol contains 6.022e23 entities by definition.
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Which gas law states that volume is directly proportional to absolute temperature at constant pressure and moles?
Graham's law
Dalton's law
Boyle's law
Charles's law - Explanation: V proportional to T at constant P and n.
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An endothermic reaction absorbs heat from its surroundings.
True - Explanation: Endothermic processes have positive enthalpy change and take in heat.
False
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Which element is a halogen in the periodic table?
Oxygen
Chlorine - Explanation: Halogens are Group 17 elements like F, Cl, Br, I, At, Ts.
Sodium
Neon
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pH 3 corresponds to a basic solution.
True
False - Explanation: pH less than 7 is acidic.
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Which subshell can hold a maximum of 10 electrons?
s orbital
p orbital set
f orbital set
d orbital set
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Which species is the oxidizing agent in the reaction: Zn(s) + Cu2+(aq) -> Zn2+(aq) + Cu(s)?
Cu
Zn2+
Zn
Cu2+ - Explanation: Cu2+ gains electrons (is reduced) and thus oxidizes Zn.
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The rate of a chemical reaction generally increases with temperature because a larger fraction of molecules exceed the activation energy.
False
True - Explanation: Higher temperature shifts the Maxwell-Boltzmann distribution to higher energies.
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Which acid-base pair best represents a buffer solution when mixed in comparable amounts?
HCl and NaCl
NaOH and KCl
NH3 and HClO4
Acetic acid and sodium acetate - Explanation: A weak acid with its conjugate base forms a buffer.
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Increasing the pressure on a gas-phase equilibrium always shifts the equilibrium toward the side with more moles of gas.
False - Explanation: Higher pressure favors the side with fewer moles of gas.
True
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What is the geometry of methane (CH4) according to VSEPR theory?
Trigonal pyramidal
Tetrahedral - Explanation: Four bonding pairs around carbon lead to tetrahedral geometry.
Bent
Trigonal planar
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In a galvanic cell, the anode is the electrode where oxidation occurs.
False
True - Explanation: Anode is oxidation in both galvanic and electrolytic cells; sign differs.
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Which statement correctly describes hydrogen bonding?
It is a covalent bond between H and any nonmetal
It only occurs in ionic compounds
It requires metallic bonding
It is a strong dipole-dipole attraction between H and N, O, or F atoms - Explanation: H-bonding occurs when H is bonded to highly electronegative N, O, or F and interacts with a lone pair.
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Which statement about the photoelectric effect is correct?
Electrons are ejected only if photon frequency exceeds a threshold - Explanation: Energy depends on frequency, not intensity threshold.
Any frequency ejects electrons if bright enough
Photon intensity sets electron kinetic energy only
Increasing light intensity always ejects electrons
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All second-order reactions have a constant half-life independent of initial concentration.
True
False - Explanation: Second-order half-life depends on initial concentration (t1/2 = 1/(k[A]0)).
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Which statement is true for a saturated solution at a given temperature?
It contains no solute
It cannot conduct electricity
It is at equilibrium with undissolved solute - Explanation: Dissolution and precipitation occur at equal rates.
It must be supersaturated
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Increasing ionic strength of a solution generally increases the activity coefficients toward 1.
True
False - Explanation: Higher ionic strength usually lowers activity coefficients below 1 for ions.
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Which compound displays geometric (cis-trans) isomerism due to restricted rotation?
2-butanol
Ethane
2-butene - Explanation: The C=C double bond prevents free rotation, enabling cis-trans isomers.
Propane
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A positive cell potential for a redox reaction indicates the reaction is nonspontaneous under standard conditions.
True
False - Explanation: Positive E° corresponds to negative Delta G° and spontaneity.
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Study Outcomes

  1. Identify Elemental Properties -

    After completing Dr. Doe's chemistry quiz, readers will be able to recall element names, symbols, and atomic numbers for common elements.

  2. Classify Chemical Compounds -

    Readers will learn to distinguish between ionic, covalent, and metallic compounds based on bonding characteristics.

  3. Predict Reaction Outcomes -

    Participants will develop the ability to anticipate products of basic chemical reactions and balance simple equations.

  4. Analyze Periodic Trends -

    Users will understand periodic table trends such as electronegativity and atomic radius and apply them to element behavior.

  5. Apply Mechanistic Principles -

    Quiz takers will gain insight into reaction mechanisms, enabling them to propose step-by-step processes for organic and inorganic reactions.

Cheat Sheet

  1. Periodic Table Trends -

    Mastering atomic radius, ionization energy, and electronegativity trends lets you predict element behavior on Dr. Doe's chemistry quiz. A popular mnemonic - "FONClBrISCH" - helps you recall electronegativity order (Fluorine, Oxygen, Nitrogen, Chlorine, Bromine, Iodine, Sulfur, Carbon, Hydrogen). These patterns align with IUPAC guidelines and top university chemistry resources.

  2. Balancing Chemical Equations -

    Balancing equations enforces the law of conservation of mass, ensuring atom counts match on both sides. For example, balance H₂ + O₂ → H₂O by adjusting coefficients to 2 H₂ + O₂ → 2 H₂O, a method endorsed by Khan Academy and ACS materials. Regular practice with simple redox and double-replacement reactions builds your confidence for any Dr. Doe chemical quiz question.

  3. Reaction Types -

    Recognize synthesis, decomposition, single- and double-replacement, and combustion reactions to quickly classify questions on Dr. Doe chem quizzes. For instance, CH₄ + 2 O₂ → CO₂ + 2 H₂O is a classic combustion example. Resources like Chemguide and Royal Society of Chemistry documents provide clear reaction grids to drill these patterns.

  4. Stoichiometry & Limiting Reactants -

    Stoichiometry transforms grams to moles to product yields, a core skill tested on Dr. Doe's chemistry quiz. Use molar masses from PubChem and set up mole ratios - for example, calculate grams of CO₂ from 5 g of C by converting grams → moles → grams. Identifying the limiting reactant ensures accurate yield predictions every time.

  5. Acid-Base Concepts & pH -

    Understanding Arrhenius, Brønsted - Lowry, and Lewis definitions sharpens your acid-base fluency for Dr. Doe chem classes. Remember pH = - log[H❺], so a 1×10❻³ M solution has pH = 3. Official IUPAC guidelines and university textbooks provide sample titration curves and buffer problems for extra practice.

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