What is density?
Chemistry unit 2 review

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•
Chemistry
•
11th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
Density is the mass of an object divided by its volume, typically expressed in g/cm³ or g/mL.
2.
FLASHCARD QUESTION
Front
How do you calculate density?
Back
Density = Mass / Volume.
3.
FLASHCARD QUESTION
Front
What is the density of copper if its mass is 216g and volume is 24cm³?
Back
9 g/cm³.
4.
FLASHCARD QUESTION
Front
What is a compound?
Back
A compound is a substance formed when two or more elements are chemically bonded together, such as H2O.
5.
FLASHCARD QUESTION
Front
What is the half-life of an isotope?
Back
The half-life is the amount of time it takes for half of the nuclei in a sample of the isotope to decay.
6.
FLASHCARD QUESTION
Front
If an isotope has a half-life of 3 days, how much of a 100g sample remains after 6 days?
Back
25g remains after 6 days.
7.
FLASHCARD QUESTION
Front
What is the formula for calculating the remaining quantity of a substance after a certain number of half-lives?
Back
Remaining quantity = Initial quantity × (1/2)^(number of half-lives).
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