Midterm Chemistry 2024-2025- Mrs. Chacon

Flashcard
•
Chemistry
•
7th - 10th Grade
•
Hard
Wayground Content
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the main job of engineers?
Back
Solving problems.
2.
FLASHCARD QUESTION
Front
What happens when baking soda and vinegar combine?
Back
They undergo a chemical change to produce carbon dioxide.
3.
FLASHCARD QUESTION
Front
How do you calculate the mass number of an atom?
Back
Mass number = Number of protons + Number of neutrons.
4.
FLASHCARD QUESTION
Front
What is the density of an object if its mass is 1g and its volume is 2cm³?
Back
Density = Mass/Volume = 1g/2cm³ = 0.5 g/cm³.
5.
FLASHCARD QUESTION
Front
What is the mass number of an atom with 20 protons, 19 electrons, and 18 neutrons?
Back
Mass number = 20 protons + 18 neutrons = 38.
6.
FLASHCARD QUESTION
Front
What is a chemical change?
Back
A process where substances combine or break apart to form new substances.
7.
FLASHCARD QUESTION
Front
What is a physical change?
Back
A change that affects one or more physical properties of a substance without altering its chemical composition.
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