AP Chemistry/ Unit 1: Atomic Structure and Properties

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You’ll explore how atoms come together to create solids, liquids, and gases, and how forces between particles govern the properties of everything around you.

Question Difficulty:

Question	Difficulty	Students Solved
Calculating Mass from Moles	medium	100
Coulomb's Law and Distance	medium	80
Stoichiometric Calculation of Atoms	medium	49
Stoichiometric Calculation of Moles	medium	59
Empirical Formula From Molecular Formula	medium	62
Ranking Solutions by Molarity	medium	55
Electron Configuration and Element Identity	medium	58
Principle of Distillation	medium	50
Percent Composition by Mass	medium	43
Calculating Moles From Mass	medium	27
Homogeneous and Heterogeneous Mixtures	medium	32
Elemental Composition By Mass	medium	20
Successive Ionization Energies	medium	20
Principles of Electron Configuration	medium	27
Ideal Gas Law Mole Calculation	medium	14
Stoichiometric Calculation Of Atoms	medium	12
Molecular Formula From Percent Composition	medium	10
Mass Percent of an Element in a Mixture	medium	11
Periodic Trends and Halogen Reactivity	medium	13
Predicting Group from Compound Formulas	medium	5

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Unit Leaderboard

Rank	User	Correct Count	Attempt Count	Total Time	Score
#1	dldpwn7424	96	100	0m 00s	9,560
#2	misop0709	73	96	0m 05s	7,065
#3	lockdante2	69	106	0m 00s	6,530
#4	yeoneunseol	67	101	0m 00s	6,360
#5	ronthetennisguy	62	71	0m 00s	6,110
#6	itzzhanachan	60	67	0m 00s	5,930
#7	ayemenduh	59	88	0m 00s	5,610
#8	saunialwis	41	60	0m 00s	3,910
#9	selenavuong2009	66	101	41m 52s	3,738
#10	mohamkhan303	40	69	0m 00s	3,710

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