Unit 2 Assessment
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 reaction?
Back
A process where substances (reactants) transform into new substances (products) with different properties.
2.
FLASHCARD QUESTION
Front
What does it mean for mass to be conserved in a chemical reaction?
Back
The total mass of reactants equals the total mass of products; mass is neither created nor destroyed.
3.
FLASHCARD QUESTION
Front
What is a model in science?
Back
A representation of an object or system that helps to explain and predict its behavior.
4.
FLASHCARD QUESTION
Front
What evidence indicates a chemical change has occurred?
Back
Evidence includes color change, temperature change, gas production, or formation of a precipitate.
5.
FLASHCARD QUESTION
Front
What is a prototype?
Back
An initial model or version of a product used to test and refine ideas.
6.
FLASHCARD QUESTION
Front
What is an open system in chemistry?
Back
A system that can exchange both matter and energy with its surroundings.
7.
FLASHCARD QUESTION
Front
What is a closed system in chemistry?
Back
A system that can exchange energy but not matter with its surroundings.
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