Conquer CHEM 140.
2,450 questions from Tro chapters 1–6, timed exams built like the real ones, and a coach that reads your misses. Free for classmates.
- Drill
- Pick chapters and topics with sliders, get feedback after every answer, and keep going. Unseen questions come first; nothing repeats until you have seen the whole topic.
- Exam
- Sixty questions in the instructor’s mix, graded at the end, with an optional clock. Scored against the 145-of-150 pace.
- Your misses
- Wrong answers are sorted into didn’t know, knew it but wrote it wrong, and sig figs — so you fix the right thing. A focus slider feeds them back into your next drill.
- Coach
- Reads a finished session and tells you what to drill next, then loads that drill into the sliders for you.
- Leaderboard
- Opt in from your account page. Top ten by accuracy, streak and volume among classmates.