Chemical and Physical Changes
Flashcard
•
Science
•
7th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a chemical change?
Back
A process where substances combine or break apart to form new substances, often accompanied by energy changes.
2.
FLASHCARD QUESTION
Front
What is a physical change?
Back
A change that affects one or more physical properties of a substance without altering its chemical composition.
3.
FLASHCARD QUESTION
Front
Example of a chemical change: A candle burning. What happens?
Back
The wax (a hydrocarbon) reacts with oxygen to produce carbon dioxide, water, and heat.
4.
FLASHCARD QUESTION
Front
Example of a chemical change: Iron turning into rust. What is the process called?
Back
Oxidation, where iron reacts with oxygen and moisture to form iron oxide (rust).
5.
FLASHCARD QUESTION
Front
Example of a chemical change: Acid cooking a raw egg. What occurs?
Back
The proteins in the egg undergo a chemical reaction, changing their structure and properties.
6.
FLASHCARD QUESTION
Front
Example of a physical change: Changing the shape of Play-Doh. What is the key characteristic?
Back
The material remains the same (Play-Doh), only its shape is altered.
7.
FLASHCARD QUESTION
Front
Example of a physical change: Smashing a bug. What happens?
Back
The bug's physical form is altered, but its chemical composition remains unchanged.
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