What is a physical change?
Physical and Chemical Changes

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Science
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5th - 8th Grade
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Hard
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1.
FLASHCARD QUESTION
Front
Back
A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in state (like melting or freezing), shape, or size.
2.
FLASHCARD QUESTION
Front
What is a chemical change?
Back
A chemical change is a change that results in the formation of new chemical substances. It involves a rearrangement of atoms and is often accompanied by energy changes, color changes, gas production, or the formation of a precipitate.
3.
FLASHCARD QUESTION
Front
Can you give an example of a physical change?
Back
An example of a physical change is the melting of ice into water. The chemical composition of water remains the same (H2O), but its state changes from solid to liquid.
4.
FLASHCARD QUESTION
Front
Can you give an example of a chemical change?
Back
An example of a chemical change is the rusting of iron. When iron reacts with oxygen in the presence of moisture, it forms iron oxide (rust), which is a different substance.
5.
FLASHCARD QUESTION
Front
What are some indicators of a chemical change?
Back
Indicators of a chemical change include color change, temperature change, gas production (bubbles), formation of a precipitate, and changes in odor.
6.
FLASHCARD QUESTION
Front
What is the law of conservation of mass in relation to chemical changes?
Back
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of the reactants equals the total mass of the products.
7.
FLASHCARD QUESTION
Front
How can you differentiate between physical and chemical changes?
Back
You can differentiate between physical and chemical changes by observing whether the substance's chemical identity changes. If it does, it's a chemical change; if it doesn't, it's a physical change.
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