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Chemical reactions and conservation of mass test
This 7th-grade assessment helps students identify chemical reactions and understand the conservation of mass through multiple-choice and short-answer questions. Students practice recognizing signs of chemical change, applying the law of conservation of mass, and identifying reactants within chemical equations.
By Edform · Science · Grade 7 · Published Oct 15, 2026 · New
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Questions
- Which of the following is a chemical change?
- Select all the signs that a chemical reaction has occurred.
- The total mass of the products in a chemical reaction is always equal to the total mass of the reactants.
- What do we call a substance that is present at the start of a chemical reaction?
- Which equation is balanced?
- Which of the following are examples of physical changes?
- In a closed system, the mass of substances before and after a chemical reaction stays the same.
- If 20 grams of hydrogen react completely with 160 grams of oxygen to form water, what is the total mass of water produced?
- What do we call the substances formed as a result of a chemical reaction?
- Which statement best describes the conservation of mass?
- Which of the following are chemical reactions?
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