This Grade 5 worksheet builds vocabulary around reactants, products, exothermic and endothermic reactions, and conservation of matter. Through fills and matching, fifth graders track how atoms rearrange during chemical reactions, ensuring that mass stays constant even when burning, baking, or precipitating new substances in NGSS 5-PS1 contexts. Students separate mixtures and solutions through mechanical and evaporation methods in Grade 5 lab-style scenarios that build skills today and tomorrow.
Style:
Chemical and Physical Changes
Part A: Fill in the Blank
Write the missing word or number on each line.
1. In the reaction between baking soda and vinegar, baking soda and vinegar are the reactants that react together.
2. The new substances formed after a chemical reaction are called products, like the carbon dioxide gas from vinegar and baking soda.
3. Before a chemical reaction, 50 grams of reactants are sealed in a flask; after the reaction, the total mass must still be 50 grams.
4. When a candle burns, wax and oxygen are reactants that combine to make carbon dioxide, water vapor, and heat.
5. If a chemical change releases heat, scientists describe the reaction as exothermic, meaning energy leaves the reaction.
6. A change that absorbs energy and feels colder is called an endothermic reaction, like an instant cold pack.
7. Mixing a clear silver nitrate solution with a clear salt solution forms a white solid called a precipitate, a sign of a chemical change.
8. Even though a wooden log seems to disappear when it burns, the matter is not lost — it has changed into ash, gases, and smoke.
9. Chemical reactions rearrange atoms but never create or destroy them, which is why mass is conserved.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Substances that go into a reaction
→ Reactants
Conservation of matter
Substances formed by a reaction
→ Products
Precipitate formation
Total mass stays the same in a sealed reaction
→ Conservation of matter
Reactants
White solid forms from two clear liquids
→ Precipitate formation
Products
Chemical and Physical Changes
★ Part A: Fill in the Blank
Write the missing word or number on each line.
1) In the reaction between baking soda and vinegar, baking soda and vinegar are the reactants that react together.
2) The new substances formed after a chemical reaction are called products, like the carbon dioxide gas from vinegar and baking soda.
3) Before a chemical reaction, 50 grams of reactants are sealed in a flask; after the reaction, the total mass must still be 50 grams.
4) When a candle burns, wax and oxygen are reactants that combine to make carbon dioxide, water vapor, and heat.
5) If a chemical change releases heat, scientists describe the reaction as exothermic, meaning energy leaves the reaction.
6) A change that absorbs energy and feels colder is called an endothermic reaction, like an instant cold pack.
7) Mixing a clear silver nitrate solution with a clear salt solution forms a white solid called a precipitate, a sign of a chemical change.
8) Even though a wooden log seems to disappear when it burns, the matter is not lost — it has changed into ash, gases, and smoke.
9) Chemical reactions rearrange atoms but never create or destroy them, which is why mass is conserved.
★ Part B: Matching
Match each item on the left to the correct answer on the right.
1) Match each item to its correct answer.
Substances that go into a reaction
→ Reactants
Conservation of matter
Substances formed by a reaction
→ Products
Precipitate formation
Total mass stays the same in a sealed reaction
→ Conservation of matter
Reactants
White solid forms from two clear liquids
→ Precipitate formation
Products
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10 Questions
10-15 minutes
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