2425 cba review
Flashcard
•
Science
•
7th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a pure substance?
Back
A material that has a constant composition and consistent properties throughout. Examples include elements and compounds.
2.
FLASHCARD QUESTION
Front
What is a mixture?
Back
A combination of two or more substances that are not chemically bonded and can be separated by physical means.
3.
FLASHCARD QUESTION
Front
What is a physical property?
Back
A characteristic of a substance that can be observed or measured without changing its identity, such as density, color, or melting point.
4.
FLASHCARD QUESTION
Front
What is density?
Back
The mass of a substance divided by its volume, often expressed in grams per cubic centimeter (g/cm³).
5.
FLASHCARD QUESTION
Front
What are balanced forces?
Back
Forces that are equal in size and opposite in direction, resulting in no change in motion.
6.
FLASHCARD QUESTION
Front
What is an example of balanced forces?
Back
A book resting on a table, where the force of gravity is balanced by the normal force from the table.
7.
FLASHCARD QUESTION
Front
What is a base?
Back
A substance that increases the concentration of hydroxide ions (OH-) in a solution.
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