Unit 4 Review
Flashcard
•
Science
•
8th Grade
•
Practice Problem
•
Hard
+3
Standards-aligned
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15 questions
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1.
FLASHCARD QUESTION
Front
What happens to the mass of a liquid in a thermometer when it is heated?
Back
The mass stays the same.
2.
FLASHCARD QUESTION
Front
What effect does decreasing the temperature have on the rate of a chemical reaction?
Back
It slows down the rate of the chemical reaction.
Tags
NGSS.MS-PS3-4
3.
FLASHCARD QUESTION
Front
How can a chemist speed up a slow chemical reaction in a beaker?
Back
By heating the beaker on a hot plate.
Tags
NGSS.MS-PS1-4
NGSS.MS-PS3-3
4.
FLASHCARD QUESTION
Front
Why does an opened bottle of milk stay fresh longer in a refrigerator than at room temperature?
Back
The lower temperature reduces the rate of the chemical reaction.
Tags
NGSS.MS-PS1-4
NGSS.MS-PS3-4
5.
FLASHCARD QUESTION
Front
What is the difference between scientific laws and theories?
Back
Laws are descriptions of phenomena, while theories are explanations of why phenomena exist.
6.
FLASHCARD QUESTION
Front
What is the definition of a chemical reaction?
Back
A process in which substances (reactants) are transformed into different substances (products).
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
7.
FLASHCARD QUESTION
Front
What is the role of temperature in chemical reactions?
Back
Temperature affects the energy of particles, influencing the rate of chemical reactions.
Tags
NGSS.MS-PS1-4
NGSS.MS-PS3-4
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