This Grade 5 challenge worksheet asks students to identify chemical and physical changes in real-world scenarios — rusting bikes, melting popsicles, sour milk, crushed cans, and burning paper. Multiple choice and fills push fifth graders to apply conservation of matter and the signs of chemical change to NGSS 5-PS1 reasoning. Students apply conservation of matter to predict masses before and after reactions in advanced Grade 5 scenarios building strong reasoning skills now today.
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Chemical and Physical Changes
Part A: Multiple Choice
Circle the best answer for each question.
1. Which observation is the strongest evidence that a chemical change has happened?
A) A liquid becomes solid when cooled
B) A color changes and a new gas is given off
C) A piece of metal is bent into a curve
D) A sugar cube dissolves in hot tea
2. A student burns a piece of paper and weighs the leftover ash. The ash weighs less than the paper. What happened to the missing mass?
A) Mass was destroyed in the chemical reaction
B) It floated away as smoke and gases that were not weighed
C) The paper was turned into pure energy with no mass
D) The scale was broken before the reaction
3. Which everyday example shows BOTH a physical change and a chemical change?
A) Boiling water in a pot until it becomes vapor
B) Cutting a tomato into slices for a salad
C) Lighting a candle so the wax melts and the wick burns
D) Folding a paper airplane and throwing it
4. Two clear liquids are mixed in a beaker. Which result best shows that a chemical change took place?
A) The liquids combine and stay clear
B) The mixture turns yellow and a solid forms at the bottom
C) The temperature stays exactly the same
D) The mixture can be separated by simple filtration
Part B: Fill in the Blank
Write the correct answer on each line.
1. When a bike chain rusts in the rain, it has gone through a chemical change because iron and oxygen made a new substance.
2. When a popsicle melts in the sun, it has gone through a physical change because the liquid is still the same substance.
3. Sour milk smells bad because tiny living things have caused a chemical change in the milk.
4. Crushing a soda can changes its shape but not the metal it is made of, so it is a physical change.
5. By the law of conservation of matter, atoms are rearranged but never destroyed during a chemical change.
Chemical and Physical Changes
★ Part A: Multiple Choice
Circle the best answer for each question.
1. Which observation is the strongest evidence that a chemical change has happened?
A) A liquid becomes solid when cooled
B) A color changes and a new gas is given off
C) A piece of metal is bent into a curve
D) A sugar cube dissolves in hot tea
2. A student burns a piece of paper and weighs the leftover ash. The ash weighs less than the paper. What happened to the missing mass?
A) Mass was destroyed in the chemical reaction
B) It floated away as smoke and gases that were not weighed
C) The paper was turned into pure energy with no mass
D) The scale was broken before the reaction
3. Which everyday example shows BOTH a physical change and a chemical change?
A) Boiling water in a pot until it becomes vapor
B) Cutting a tomato into slices for a salad
C) Lighting a candle so the wax melts and the wick burns
D) Folding a paper airplane and throwing it
4. Two clear liquids are mixed in a beaker. Which result best shows that a chemical change took place?
A) The liquids combine and stay clear
B) The mixture turns yellow and a solid forms at the bottom
C) The temperature stays exactly the same
D) The mixture can be separated by simple filtration
★ Part B: Fill in the Blank
Write the correct answer on each line.
1) When a bike chain rusts in the rain, it has gone through a chemical change because iron and oxygen made a new substance.
2) When a popsicle melts in the sun, it has gone through a physical change because the liquid is still the same substance.
3) Sour milk smells bad because tiny living things have caused a chemical change in the milk.
4) Crushing a soda can changes its shape but not the metal it is made of, so it is a physical change.
5) By the law of conservation of matter, atoms are rearranged but never destroyed during a chemical change.
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9 Questions
12-18 minutes
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