Unit Four Optional Review

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•
Chemistry
•
9th - 12th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a stock solution?
Back
A highly concentrated solution that is meant to be diluted to some lower concentration.
2.
FLASHCARD QUESTION
Front
What is the abbreviation for molarity?
Back
M
3.
FLASHCARD QUESTION
Front
How do you determine the empirical formula from percent composition?
Back
Convert the percentages to grams, divide by the molar mass of each element, and find the simplest whole number ratio.
4.
FLASHCARD QUESTION
Front
What is the empirical formula for a compound with 88.80% copper and 11.20% oxygen?
Back
Cu2O
5.
FLASHCARD QUESTION
Front
How do you calculate the number of moles in a solution?
Back
Moles = Molarity (M) x Volume (L).
6.
FLASHCARD QUESTION
Front
What happens to the number of moles when a solution is diluted?
Back
The number of moles remains the same; only the concentration changes.
7.
FLASHCARD QUESTION
Front
If 0.775 L of 1.00 M NaOH is diluted to 1.00 L, how many moles of NaOH are present?
Back
0.775 mol NaOH.
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