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Step two

One question at a time.

Fourteen questions on one bond path. Each node fills as you answer, the topic tag sits above the prompt, and you can step back at any point.

Question 1 of 14

Dimensional analysis

Ethanol has a density of 0.789 g/mL. What is the mass of a 25.0 mL sample of ethanol?

19.7 g
31.7 g
0.0316 g
197 g

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Sample question, shown as a static preview. Question, choices and topic tag are the first record in the General Chemistry bank.

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General Chemistry I Readiness Check

50%

7 of 14 correct

Result band

Four bands tile the range from 0 to 100. This score lands in the third one, and the plan below is the one written for it.

At risk

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Where to focus

Stoichiometry limiting reagent

Chose the reagent with fewer moles (N2) as limiting without checking the 1:3 ratio. N2 is actually in excess because H2 runs out first.
Significant figures

Applied the multiplication rule (fewest significant figures, which would be 2) instead of the addition rule (fewest decimal places).
Periodic trends

Reversed the trend, assuming more protons and electrons make a larger atom. Greater nuclear charge actually contracts the radius across a period.

Review every question

Question 5: Stoichiometry limiting reagent – Review

For the reaction N2 + 3 H2 -> 2 NH3, 2.0 mol N2 reacts with 3.0 mol H2. Which reagent is limiting, and how many moles of NH3 form?

Your answer A. N2 is limiting; 4.0 mol NH3

Correct answer B. H2 is limiting; 2.0 mol NH3

The mole ratio, not the raw mole counts, decides the limiting reagent. Fully reacting 2.0 mol N2 would require 6.0 mol H2, but only 3.0 mol H2 is available, so H2 runs out first. Converting the limiting H2: 3.0 mol H2 times (2 mol NH3 per 3 mol H2) gives 2.0 mol NH3.

Question 1: Dimensional analysis – Correct

Question 2: Significant figures – Correct

Question 3: Significant figures – Review

Start Over Try IB Chemistry

Sample results, shown as a static preview. Score is one worked example; the band copy, focus notes and review entries are real records from the General Chemistry bank.

Coverage

The topics each check draws from.

General Chemistry I Readiness Check

14 questions · 10 to 15 minutes

Dimensional analysis
Significant figures
Mole concept
Stoichiometry limiting reagent
Nomenclature
Periodic trends
Bonding basics
Lewis structures
Gas laws partial pressure
Gas laws ideal
Solution concentration
Acid base basics
Thermochemistry sign conventions

IB Chemistry Core Readiness Check

14 questions · 10 to 15 minutes

Quantitative chemistry
Atomic structure
Periodicity
Bonding intermolecular forces
Bonding molecular polarity
Energetics
Kinetics
Equilibrium
Acids bases