AP Chemistry Unit 1 Practice

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•
Chemistry
•
10th - 12th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the balanced chemical equation for the formation of ammonia from nitrogen and hydrogen?
Back
N2(g) + 3H2(g) → 2NH3(g)
2.
FLASHCARD QUESTION
Front
How do you calculate the mass of a product formed in a chemical reaction?
Back
Use stoichiometry: Convert grams of reactant to moles, use the mole ratio from the balanced equation, then convert moles of product back to grams.
3.
FLASHCARD QUESTION
Front
What is the formula to calculate the percentage by mass of an element in a compound?
Back
(mass of element in 1 mole of compound / molar mass of compound) × 100%.
4.
FLASHCARD QUESTION
Front
How do you determine the mass of a compound in a mixture given the percentage by mass?
Back
Multiply the total mass of the mixture by the percentage (as a decimal) of the compound.
5.
FLASHCARD QUESTION
Front
What is the formula for a carbonate compound formed with a metal X?
Back
The formula is XCO3, where X is the metal.
6.
FLASHCARD QUESTION
Front
What is a hydrate in chemistry?
Back
A hydrate is a compound that contains water molecules within its structure.
7.
FLASHCARD QUESTION
Front
How do you find the formula of a hydrate?
Back
Determine the mass of water lost upon heating, then use the molar mass of the anhydrous compound and water to find the ratio.
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