1st Semester Exam prep

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•
Science
•
8th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the atomic number of an element?
Back
The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.
2.
FLASHCARD QUESTION
Front
What is the atomic mass of an element?
Back
The atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).
3.
FLASHCARD QUESTION
Front
What is the difference between atomic number and atomic mass?
Back
The difference is the number of neutrons in the atom.
4.
FLASHCARD QUESTION
Front
What is an endothermic reaction?
Back
An endothermic reaction is a chemical reaction that absorbs heat energy from its surroundings.
5.
FLASHCARD QUESTION
Front
How does an endothermic reaction feel to the touch?
Back
It feels cold to the touch because it absorbs heat energy.
6.
FLASHCARD QUESTION
Front
What happens to the total mass in a chemical reaction?
Back
According to the law of conservation of mass, the total mass remains the same before and after the reaction.
7.
FLASHCARD QUESTION
Front
What occurs when water changes from steam to liquid?
Back
The water molecules move slower and occupy less space.
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