Unit 4: Chemical Reactions

/ Unit 4: Chemical Reactions

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You’ll learn how to differentiate physical and chemical processes, and how to measure and express chemical reactions via chemical equations.

Question Difficulty:

Question	Difficulty	Students Solved
Identifying an Amphoteric Substance	medium	23
Chemical vs Physical Changes and Bonding	medium	18
Activation Energy in Synthesis Reactions	medium	11
Particulate Model of a Physical Change	medium	13
Limiting Reactant and Theoretical Yield	medium	9
Titration Endpoint and Equivalence Point	medium	9
Halogen Displacement Reaction	medium	9
Acid-Base Titration Analysis	medium	7
Gravimetric Analysis and Theoretical Yield	medium	8
Carbon Oxidation Number in Combustion	medium	7
Classifying Salt Dissolution	medium	8
Evidence for a Physical Change	medium	4
Relationship Between Ka and pKb	medium	3
Molarity and the Principle of Dilution	medium	4
Equilibrium Constant and Pressure Change	medium	2
Lattice Energy of Ionic Compounds	medium	2
Redox Titration Endpoint Evidence	medium	2
Balancing A Reduction Half-Reaction	medium	1
Principles of Complete Combustion	medium	2
Dissolution of an Ionic Compound	medium	-

Items per page:

1 – 20 of 611

Rank	User	Correct Count	Attempt Count	Time	Score
#1	heodavidheo	113	170	0m 00s	10,730
#2	dldpwn7424	89	100	0m 00s	8,790
#3	ronthetennisguy	58	65	0m 00s	5,730
#4	Derinchiay2013	72	87	36m 49s	4,841
#5	aaravmohindra7	38	38	0m 00s	3,800
#6	ayemenduh	35	55	0m 00s	3,300
#7	ratmadeline	23	30	0m 00s	2,230
#8	p250001155	23	35	0m 00s	2,180
#9	khaled.aboulhoda	22	25	0m 00s	2,170
#10	itzzhanachan	22	32	0m 00s	2,100

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