What is a physical change?
Physical/Chemical Changes

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•
Chemistry
•
7th Grade
•
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 melting, freezing, and dissolving.
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 chemical reaction and changes the composition of the original substance. Examples include burning, rusting, and cooking.
3.
FLASHCARD QUESTION
Front
What happens to the energy during a chemical change?
Back
During a chemical change, energy is either absorbed or released. For example, in exothermic reactions, heat is released, while in endothermic reactions, heat is absorbed.
4.
FLASHCARD QUESTION
Front
What is the difference between physical and chemical properties?
Back
Physical properties can be observed without changing the substance's chemical identity (e.g., color, shape, boiling point), while chemical properties can only be observed during a chemical reaction (e.g., flammability, reactivity).
5.
FLASHCARD QUESTION
Front
What is an example of a physical change?
Back
An example of a physical change is ice melting into water. The substance remains H2O, but its state changes from solid to liquid.
6.
FLASHCARD QUESTION
Front
What is an example of a chemical change?
Back
An example of a chemical change is iron rusting. The iron reacts with oxygen to form iron oxide, a new substance.
7.
FLASHCARD QUESTION
Front
What are the three states of matter?
Back
The three states of matter are solid, liquid, and gas. Each state has distinct properties based on particle arrangement and energy.
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