This Grade 5 chemical changes worksheet guides fifth graders through real-world examples like fireworks, digestion, photosynthesis, vinegar with baking soda, and rusting bicycles. Students correct mistakes, fill in terms such as glucose and combustion, and write short responses explaining why rust and baked cakes are chemical changes. The activities highlight new substances, energy release, and irreversibility as clues to chemical changes for NGSS 5-PS1.
Style:
Chemical and Physical Changes
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
Fireworks exploding in the sky are a physical change.
Rewrite: Fireworks exploding in the sky are a chemical change.
2. Fix the sentence:
Mixing vinegar and baking soda fizz because of a physical change.
Rewrite: Mixing vinegar and baking soda fizzes because of a chemical change.
3. Fix the sentence:
Plants doing photosynthesis is just moving sunlight around physically.
Rewrite: Plants doing photosynthesis make new sugar through a chemical change.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. When food is digested in your stomach, it goes through a chemical change that creates new substances.
2. The fizzing bubbles when vinegar meets baking soda are made of carbon dioxide gas.
3. Plants use sunlight to combine water and carbon dioxide into glucose, a sugar that fuels their growth.
4. The combustion of a firework releases gases, light, heat, and sound all at once.
Part C: Short Answer
Answer each question in one or two complete sentences.
1. Why is rust forming on an old bicycle a chemical change instead of a physical change?
Rust is a chemical change because iron in the bicycle reacts with oxygen and water in the air to form a new substance called iron oxide. Rust has a different color, texture, and properties from the original iron, and you cannot easily turn it back into shiny metal again.
2. Explain why baking a cake is a chemical change, even though it starts with simple ingredients.
Baking a cake is a chemical change because heat causes the flour, eggs, sugar, and baking soda to react and form new substances. The fluffy cake has different taste, texture, and smell from the runny batter, and you cannot turn the cake back into batter, showing new substances formed.
Chemical and Physical Changes
★ Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1) Fix the sentence:
Fireworks exploding in the sky are a physical change.
Rewrite: Fireworks exploding in the sky are a chemical change.
2) Fix the sentence:
Mixing vinegar and baking soda fizz because of a physical change.
Rewrite: Mixing vinegar and baking soda fizzes because of a chemical change.
3) Fix the sentence:
Plants doing photosynthesis is just moving sunlight around physically.
Rewrite: Plants doing photosynthesis make new sugar through a chemical change.
★ Part B: Fill in the Blank
Write the missing word or number on each line.
1) When food is digested in your stomach, it goes through a chemical change that creates new substances.
2) The fizzing bubbles when vinegar meets baking soda are made of carbon dioxide gas.
3) Plants use sunlight to combine water and carbon dioxide into glucose, a sugar that fuels their growth.
4) The combustion of a firework releases gases, light, heat, and sound all at once.
★ Part C: Short Answer
Answer each question in one or two complete sentences.
1) Why is rust forming on an old bicycle a chemical change instead of a physical change?
Rust is a chemical change because iron in the bicycle reacts with oxygen and water in the air to form a new substance called iron oxide. Rust has a different color, texture, and properties from the original iron, and you cannot easily turn it back into shiny metal again.
2) Explain why baking a cake is a chemical change, even though it starts with simple ingredients.
Baking a cake is a chemical change because heat causes the flour, eggs, sugar, and baking soda to react and form new substances. The fluffy cake has different taste, texture, and smell from the runny batter, and you cannot turn the cake back into batter, showing new substances formed.
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9 Questions
15-20 minutes
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