Students complete nine fill-in-the-blank problems about conservation of mass and reviewing physical versus chemical changes. The matching activity pairs ice melting, baking soda and vinegar, dissolving salt, and iron rusting with their change type and explanation.
Matching everyday changes to physical or chemical types with explanations — alongside conservation of mass — connects the vocabulary of matter classification to the quantitative principle that governs all chemical reactions.
Style:
Properties of Matter
Part A: Fill in the Blank
Write the missing word or number on each line.
1. The law of conservation of mass states that matter cannot be created or destroyed.
2. In any chemical reaction the total mass before the reaction equals the total mass after.
3. When wood burns, the mass of the ash plus the mass of the gases equals the mass of the original wood.
4. A physical change alters the appearance or state of matter but not its chemical makeup.
5. A chemical change produces a new substance with different properties than the original.
6. Melting, freezing, and evaporating are all examples of physical changes.
7. Rusting occurs when iron reacts with oxygen and water to form iron oxide.
8. The total mass of reactants always equals the total mass of products in a closed system.
9. Measuring the mass of an object before and after a change helps prove conservation of mass.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Ice melting
→ Physical change — solid water becomes liquid water but stays H₂O
Physical change — salt particles mix with water but remain salt
Baking soda and vinegar
→ Chemical change — produces carbon dioxide gas and a new compound
Physical change — solid water becomes liquid water but stays H₂O
Dissolving salt
→ Physical change — salt particles mix with water but remain salt
Chemical change — iron combines with oxygen to form a new substance
Iron rusting
→ Chemical change — iron combines with oxygen to form a new substance
Chemical change — produces carbon dioxide gas and a new compound
Properties of Matter
★ Part A: Fill in the Blank
Write the missing word or number on each line.
1) The law of conservation of mass states that matter cannot be created or destroyed.
2) In any chemical reaction the total mass before the reaction equals the total mass after.
3) When wood burns, the mass of the ash plus the mass of the gases equals the mass of the original wood.
4) A physical change alters the appearance or state of matter but not its chemical makeup.
5) A chemical change produces a new substance with different properties than the original.
6) Melting, freezing, and evaporating are all examples of physical changes.
7) Rusting occurs when iron reacts with oxygen and water to form iron oxide.
8) The total mass of reactants always equals the total mass of products in a closed system.
9) Measuring the mass of an object before and after a change helps prove conservation of mass.
★ Part B: Matching
Match each item on the left to the correct answer on the right.
1) Match each item to its correct answer.
Ice melting
→ Physical change — solid water becomes liquid water but stays H₂O
Physical change — salt particles mix with water but remain salt
Baking soda and vinegar
→ Chemical change — produces carbon dioxide gas and a new compound
Physical change — solid water becomes liquid water but stays H₂O
Dissolving salt
→ Physical change — salt particles mix with water but remain salt
Chemical change — iron combines with oxygen to form a new substance
Iron rusting
→ Chemical change — iron combines with oxygen to form a new substance
Chemical change — produces carbon dioxide gas and a new compound
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10 Questions
10-15 minutes
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