
Science Fall Semester Exam
Flashcard
•
Science
•
7th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the definition of speed in physics?
Back
Speed is the distance traveled per unit of time, typically measured in meters per second (m/s).
2.
FLASHCARD QUESTION
Front
What does a speed graph represent?
Back
A speed graph shows how speed changes over time, indicating periods of acceleration, deceleration, and constant speed.
3.
FLASHCARD QUESTION
Front
During which time intervals is speed increasing if a speed graph shows increases between 20-30 seconds and 40-60 seconds?
Back
Speed is increasing between 20-30 seconds and 40-60 seconds.
4.
FLASHCARD QUESTION
Front
What is the difference between an element and a compound?
Back
An element is a pure substance made of only one type of atom, while a compound is a substance formed when two or more different elements are chemically bonded together.
5.
FLASHCARD QUESTION
Front
How can you determine the density of an object?
Back
Density is calculated by dividing the mass of the object by its volume (Density = Mass/Volume).
6.
FLASHCARD QUESTION
Front
If a marble's mass is 2 grams and it displaces 10 mL of water, what is its density?
Back
The density is 0.2 g/mL (Density = 2g / 10mL).
7.
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.
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