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Chemistry Quiz Questions: Test Your Basics

Quick, free basic chemistry quiz with instant results.

Editorial: Review CompletedCreated By: Vicky Kr. RajUpdated Aug 25, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration for a basic chemistry quiz on a dark blue background

This quiz helps you review basic chemistry: atoms, the periodic table, bonding, reactions, symbols, and simple math. Work through easy chemistry questions and get instant feedback to spot gaps before a test. When you finish, keep learning with periodic table practice, try a focused polyatomic ions quiz, or check concepts with a solubility rules quiz.

Which subatomic particle has a negative charge?
Alpha particle
Electron - Explanation: Electrons carry a negative charge, protons are positive, and neutrons are neutral.
Proton
Neutron
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The chemical symbol for sodium is Na.
False
True - Explanation: Na comes from the Latin name natrium for sodium.
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Which statement best describes a compound?
Any substance containing carbon
A solution of solids in liquids
A substance made of two or more elements chemically bonded in fixed ratios - Explanation: Compounds have elements bonded in definite proportions and cannot be separated by physical means.
A mixture of two metals
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All atoms of the same element must have the same number of neutrons.
True
False - Explanation: Isotopes of an element have the same number of protons but different numbers of neutrons.
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What is the atomic number of an element?
The number of electrons in outer shell only
The total number of neutrons
The number of protons in the nucleus - Explanation: Atomic number equals the number of protons, which defines the element.
The sum of protons and neutrons
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In a neutral atom, the number of protons equals the number of electrons.
True - Explanation: Neutral atoms have equal positive (protons) and negative (electrons) charges.
False
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Which state of matter has a definite volume but no definite shape?
Plasma
Gas
Liquid - Explanation: Liquids have a fixed volume but take the shape of their container.
Solid
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Which gas law states that pressure is inversely proportional to volume at constant temperature?
Avogadro's law
Charles's law
Gay-Lussac's law
Boyle's law - Explanation: Boyle's law states P is inversely proportional to V when T and n are constant.
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Distillation separates mixtures based on differences in boiling points.
True - Explanation: Components with lower boiling points vaporize first and can be condensed separately.
False
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Which element is a halogen?
Fluorine - Explanation: Halogens are Group 17 elements such as F, Cl, Br, I.
Magnesium
Sodium
Neon
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The mass of an electron is approximately equal to the mass of a proton.
True
False - Explanation: An electron is about 1/1836 the mass of a proton, much lighter.
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Water is denser as a liquid than as a solid.
False
True - Explanation: Ice has an open lattice due to hydrogen bonding, making it less dense than liquid water.
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Which unit is an SI base unit?
Kelvin - Explanation: Kelvin is the SI base unit for temperature. Liter and gram are derived or non-base units.
Gram
Minute
Liter
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Avogadro's number is roughly 6.02 x 10^23 entities per mole.
True - Explanation: This constant defines the number of particles in one mole.
False
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Which statement about equilibrium is correct?
At equilibrium, product concentration is always greater
At equilibrium, reactants and products stop converting
Equilibrium only occurs in closed systems with solids
At equilibrium, forward and reverse reaction rates are equal - Explanation: Concentrations are constant because rates balance, not because reactions stop.
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Which statement about significant figures is correct?
All zeros are insignificant
Only nonzero digits are significant
Trailing zeros in a number with a decimal point are significant - Explanation: For example, 2.300 has four significant figures.
Leading zeros are always significant
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The empirical formula of glucose (C6H12O6) is CH2O.
True - Explanation: Dividing subscripts by 6 gives CH2O, the simplest whole-number ratio.
False
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Beta decay emits a helium nucleus from the atom.
True
False - Explanation: Alpha decay emits a helium nucleus; beta decay emits an electron or positron.
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Which compound is insoluble in water under standard conditions?
NaNO3
AgCl - Explanation: Most silver halides like AgCl are insoluble; nitrates and alkali salts are soluble.
NH4Br
KCl
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The oxidation number of oxygen in most compounds is -2.
False
True - Explanation: Exceptions include peroxides (-1) and OF2 (+2).
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Study Outcomes

  1. Understand Atomic Structures and Bonding -

    Analyze how protons, neutrons, and electrons form atoms and how chemical bonds create molecules, reinforcing the core principles tested in basic chemistry questions.

  2. Identify Common Chemical Elements and Symbols -

    Recognize element names, symbols, and atomic numbers to confidently answer easy chemistry questions based on the periodic table.

  3. Differentiate Types of Chemical Reactions -

    Compare synthesis, decomposition, and combustion reactions to solve basic chemistry quiz problems on how substances interact and transform.

  4. Apply Periodic Table Knowledge -

    Use periodic trends such as electronegativity and atomic radius to tackle questions about chemistry science and predict element behavior.

  5. Recall Chemistry Trivia for Engagement -

    Memorize fun chemistry trivia questions to enhance your quiz experience and impress others with interesting scientific facts.

Cheat Sheet

  1. Atomic Structure Fundamentals -

    Every atom consists of protons, neutrons and electrons; the atomic number equals the number of protons and defines the element (Chemistry LibreTexts). For example, carbon has 6 protons and 6 electrons, which you can remember by "C-6" in the periodic table. Mastering this helps answer basic chemistry questions about identity and isotopes confidently.

  2. Periodic Table Trends -

    Learn how atomic radius decreases across a period and increases down a group, while electronegativity does the opposite (Royal Society of Chemistry). A mnemonic like "F is small and feisty" helps recall that fluorine is the most electronegative. Recognizing these trends makes chemistry trivia questions much easier to tackle.

  3. Chemical Bonding Basics -

    Differentiate ionic bonds (electron transfer, e.g., NaCl) from covalent bonds (electron sharing, e.g., H₂O) by comparing electronegativity differences (IUPAC). Remember: if ΔEN > 1.7 it's usually ionic, if less it's covalent. This trick answers many easy chemistry questions about bond types.

  4. Balancing Equations & Stoichiometry -

    Apply the law of conservation of mass to balance chemical reactions - like 2H₂ + O₂ → 2H₂O - ensuring the same number of each atom on both sides (ACS Publications). Use the "start with metals, then nonmetals, acids last" rule to streamline the process. Precise stoichiometric calculations are the key to nailing basic chemistry quiz problems.

  5. Acids, Bases & pH Scale -

    Understand Arrhenius definitions: acids produce H❺ in water (HCl), bases produce OH❻ (NaOH), and pH = - log[H❺] (Chemguide). A quick mnemonic is "pH < 7, acid's heaven; pH > 7, base is great." This foundational fact tackles a wide range of questions about chemistry science with confidence.

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