Unit 8 Exam Review
Flashcard
•
Chemistry
•
9th - 12th Grade
•
Practice Problem
•
Hard
Wayground Content
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15 questions
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1.
FLASHCARD QUESTION
Front
What is an empirical formula?
Back
The simplest whole-number ratio of atoms of each element in a compound.
2.
FLASHCARD QUESTION
Front
What is the empirical formula of C25H45?
Back
C5H9
3.
FLASHCARD QUESTION
Front
How do you calculate percent by mass of an element in a compound?
Back
(mass of element in 1 mole of compound / molar mass of compound) x 100%.
4.
FLASHCARD QUESTION
Front
What is the percent by mass of fluorine in CaF2?
Back
49%.
5.
FLASHCARD QUESTION
Front
What is percent composition?
Back
The percent by mass of an element in a compound.
6.
FLASHCARD QUESTION
Front
What is the empirical formula of butanoic acid, CH3(CH2)2COOH?
Back
C2H4O.
7.
FLASHCARD QUESTION
Front
How do you find the empirical formula from percent composition?
Back
Convert percentages to grams, find moles of each element, divide by the smallest number of moles.
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