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Chemical Reactions
Practice Questions

14 US Common Core Common Core US Chemistry questions on Chemical Reactions, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Chemical Reactions

Question 1 · 1 mark · Difficulty 1/3

What are the signs that a chemical reaction has occurred?

  1. The substance disappears
  2. Nothing observable happens
  3. Only a color change
  4. Color change, gas production, temperature change, precipitate formation, or odor change
Show answer & explanation
✓ Answer: D — Color change, gas production, temperature change, precipitate formation, or odor change
Evidence of a chemical reaction includes: color change, gas bubbles produced, temperature change (exo/endothermic), precipitate (solid) forms, or a new smell.
Question 2 · 1 mark · Difficulty 1/3

What is an exothermic reaction?

  1. A reaction with no energy change
  2. A reaction that only occurs at high temperatures
  3. A reaction that absorbs energy
  4. A reaction that releases energy to the surroundings
Show answer & explanation
✓ Answer: D — A reaction that releases energy to the surroundings
Exothermic reactions release energy (usually heat) to the surroundings. The products have less energy than the reactants. Examples: combustion, neutralization.
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20 questions · 25 min · free

US Common Core Common Core US Chemistry: Chemical Reactions FAQ

Is Kramizo free for US Common Core Common Core students preparing for US Chemistry?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Chemical Reactions practice with other US Chemistry topics or even switch to a totally different US Common Core subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Chemical Reactions questions aligned to the official US Common Core Common Core US Chemistry syllabus?
Every question is written against the published US Common Core Common Core US Chemistry specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real US Common Core paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from US Common Core.
How is Chemical Reactions typically tested on US Common Core Common Core US Chemistry papers?
Chemical Reactions appears across multiple question types on real US Common Core Common Core US Chemistry papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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