Physical vs. Chemical Changes in Matter
Flashcard
•
Science
•
6th - 8th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a physical change?
Back
A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include cutting, bending, or melting.
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 rusting, burning, and digestion.
3.
FLASHCARD QUESTION
Front
Is splitting logs before burning them a physical or chemical change?
Back
Physical change.
4.
FLASHCARD QUESTION
Front
What happens during bioluminescence in jellyfish?
Back
Bioluminescence is a chemical change where jellyfish produce light through a chemical reaction involving luciferin and luciferase.
5.
FLASHCARD QUESTION
Front
What role do mitochondria play in energy production?
Back
Mitochondria break down glucose in a chemical change to produce usable energy in the form of ATP.
6.
FLASHCARD QUESTION
Front
What does it indicate if the temperature decreases when a powder is added to a liquid?
Back
It indicates a chemical change, as the reaction absorbs heat, resulting in a temperature drop.
7.
FLASHCARD QUESTION
Front
What is tarnishing of silverware an example of?
Back
Tarnishing is a chemical change where silver reacts with sulfur compounds in the air, forming a black film of silver sulfide.
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