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Free US Common Core Common Core US Chemistry
Practice Paper

8 mixed-difficulty practice questions in the style of real US Common Core Common Core papers — answers, mark-scheme-style explanations, and the official exam structure all on one page.

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What the real US Common Core Common Core US Chemistry paper looks like

Paper 1
Objective and short-answer questions covering the breadth of the specification.
Paper 2
Structured and extended-response questions testing depth of understanding.
Total exam time varies by board and tier — typically 2.5 to 3.5 hours.
Grading: See the official board specification for the current grading scale.

Mini practice paper: 8 questions

Mixed-difficulty questions from across the US Chemistry syllabus. Tap "Show answer" after each to check yourself.

Q1 · Difficulty 1/3

What is a decomposition reaction?

  1. Two substances combining
  2. A compound breaks down into simpler substances: AB → A + B
  3. An element replaces another
  4. A reaction with oxygen
Show answer & explanation
✓ Answer: B — A compound breaks down into simpler substances: AB → A + B
Decomposition: one compound breaks into two or more simpler substances. Example: 2H₂O → 2H₂ + O₂ (electrolysis).
Q2 · Difficulty 1/3

What is the pH scale?

  1. A measure of volume
  2. A measure of temperature
  3. A measure of how acidic or basic a solution is, from 0 to 14
  4. A measure of concentration
Show answer & explanation
✓ Answer: C — A measure of how acidic or basic a solution is, from 0 to 14
The pH scale runs from 0 (most acidic) to 14 (most basic/alkaline). pH 7 is neutral. Strong acids have very low pH; strong bases have very high pH.
Q3 · Difficulty 1/3

What type of reaction is: 2H₂O → 2H₂ + O₂?

  1. Double replacement
  2. Synthesis
  3. Decomposition
  4. Single replacement
Show answer & explanation
✓ Answer: C — Decomposition
This is a decomposition reaction — one compound breaks down into simpler substances. The general form is AB → A + B.
Q4 · Difficulty 2/3

What happens to electronegativity as you move across a period?

  1. It alternates
  2. It decreases
  3. It generally increases
  4. It stays the same
Show answer & explanation
✓ Answer: C — It generally increases
Electronegativity generally increases across a period (left to right) because atoms have more protons pulling on shared electrons, and decreases down a group.
Q5 · Difficulty 2/3

What are valence electrons?

  1. All electrons in an atom
  2. Electrons that have been removed
  3. Electrons in the nucleus
  4. Electrons in the outermost energy level that participate in bonding
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✓ Answer: D — Electrons in the outermost energy level that participate in bonding
Valence electrons are in the outermost shell. They determine how an element bonds and its chemical reactivity. Group number often equals the number of valence electrons.
Q6 · Difficulty 2/3

What is the difference between an acid and a base?

  1. Acids produce H⁺ ions in solution; bases produce OH⁻ ions or accept H⁺ ions
  2. Bases are always solids
  3. Acids are always gases
  4. They are the same
Show answer & explanation
✓ Answer: A — Acids produce H⁺ ions in solution; bases produce OH⁻ ions or accept H⁺ ions
Acids donate protons (H⁺): HCl → H⁺ + Cl⁻. Bases accept protons or release OH⁻: NaOH → Na⁺ + OH⁻. Acids + bases → neutralisation.
Q7 · Difficulty 3/3

What is an oxidation-reduction (redox) reaction?

  1. A neutralisation reaction
  2. A decomposition reaction
  3. Only a reaction with oxygen
  4. A reaction involving the transfer of electrons between substances
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✓ Answer: D — A reaction involving the transfer of electrons between substances
In redox reactions, one substance loses electrons (oxidised) and another gains electrons (reduced). OIL RIG: Oxidation Is Loss, Reduction Is Gain.
Q8 · Difficulty 3/3

What is stoichiometry?

  1. The study of atomic structure
  2. The study of acids and bases
  3. The study of reaction speeds
  4. The calculation of quantities of reactants and products in chemical reactions using mole ratios
Show answer & explanation
✓ Answer: D — The calculation of quantities of reactants and products in chemical reactions using mole ratios
Stoichiometry uses balanced equations to calculate how much reactant is needed or product is formed. Mole ratios from coefficients are the key tool.
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US Common Core Common Core US Chemistry FAQ

What does the US Common Core Common Core US Chemistry exam look like?
The US Common Core Common Core US Chemistry exam is structured across 2 components. Paper 1: Objective and short-answer questions covering the breadth of the specification. Paper 2: Structured and extended-response questions testing depth of understanding. Total exam time varies by board and tier — typically 2.5 to 3.5 hours.
Can I download a free US Common Core Common Core US Chemistry past paper?
Real US Common Core past papers are published directly by US Common Core on their official website. Kramizo doesn't redistribute copyrighted past papers, but we do generate free AI-written practice papers in the exact same style — same command words, same difficulty tier, same mark conventions. Use this practice paper as warm-up, then time yourself on official past papers before exam day.
How is US Common Core Common Core US Chemistry graded?
See the official board specification for the current grading scale. Kramizo's practice questions are tagged with difficulty 1-3 mapping roughly to the lower, middle, and top grade boundaries you'll encounter in the real exam.