Your workbook and study guide for Chemistry I
See the question.
Know the move.
Solve it.
Developed by an award-winning professor who knows how to guide you to success
- Every chapter free
- No account
- No card
What do you need?
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What’s it about?
Pick one. You’ll see what to look for in the question and the route to solve it.
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1How many days until the test?
2What’s on it? Pick one or more.
Your plan
StartYour topics · tap ✓ to drop one, tap a name to open it
LastPractice final
20 free test-style questionsSaved on this device. No account.
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What’s on it? Pick one or more.
Tonight
For each topic: read what to look for and the route. Then take the practice final.
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Try the practice questions there: hints first, then the full answer.
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Chapter 0 · freeMath warm-upUnits, conversions, solving for x Chapter 1 · freeAtomic structureProtons, neutrons, electrons, ions
Behind or brand new? Chapter 0 covers the math every later chapter leans on.
Practice final
Final coming up? Take the 70-question practice final.
Modeled on standardized first-term general chemistry finals: 70 questions, 110 minutes. Your score by topic, with links to the lessons to review.
- Timed or untimed
- Full feedback on every question
First 20 free, no account. The full 70 are $7.99 for 2 weeks.
ChemGem’s practice final is an independent study tool, written in the style of standardized first-term general chemistry finals such as the American Chemical Society (ACS) exam. Every question is original, written for ChemGem; none is copied or adapted from any ACS exam or other ACS material. ChemGem is not affiliated with, endorsed by or sponsored by the ACS.
How every topic works
Three moves, every question
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1Recognize the clue
Read the question. Spot the few words that tell you which tool to use.
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2Follow the route
Take a few short steps, in order. Guess each one before you open it.
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3Try it and get feedback
Answer one yourself. See why it’s right or wrong, not just a red X.
Missed one? The feedback sends you back to the clue.
Sounds familiar?
Stuck usually means a missed clue
- I read the question three times and still don’t know where to start.
- I know the formulas. I just don’t know which one to use.
- I follow the example in class. Then the homework looks totally different.
- My test is Friday and I’m lost on half the chapter.
This is for you if…
- You’re taking Chemistry I in high school or college.
- You want to practice, not just reread notes.
- You’d rather know the move than memorize answers.
- You’re behind and need a clear place to start.
From now to test day
Five tools, one method
Every tool uses the same clue, route, try steps.
Start strong
Stay on track
Finish strong
What’s inside
A full Chemistry I course, topic by topic
- 10chapters, from math warm-up to gases
- 53topics, each with its clue and route
- about 330practice problems with hints
- 70questions in the practice final
Free and price
Every chapter free. The full practice final is $7.99.
Free
$0- Every chapter, 0 to 9
- Lessons, practice with hints, flashcards
- 53 topic pages
- The first 20 practice-final questions
- No account. No card.
Practice final
$7.99- Modeled on standardized first-term general chemistry finals: 70 questions, 110 minutes
- Timed or untimed
- Full feedback on every question
- Score by topic, with what to review
- 2 weeks, for the run-up to your final
Who made this
An award-winning professor and Ph.D. scientist
Decades of experience teaching and mentoring students and young scientists.
He built ChemGem around one method: find the clue, follow the route, then try it yourself. The goal is that you can do the next question on your own.
Questions
Before you start
Is it really free?
Yes. Every chapter, 0 to 9, is free: lessons, practice, flashcards and topic pages. No account, no card. The only thing you can buy is the full 70-question practice final: $7.99 for 2 weeks. The first 20 questions are free.
What’s in the practice final?
It is modeled on standardized first-term general chemistry finals: 70 multiple-choice questions, 110 minutes, across all chapters. Take it timed (exam mode) or untimed (study mode, where you check each answer as you go). You get full feedback on every question: the right answer, why, and a link to its lesson, plus your score by chapter and topic.
Original ChemGem questions.
Do I need an account?
No. There’s no sign-up. Your progress is saved in this browser on this device.
Is this an answer machine?
No. Each practice question gives you hints first. The full worked solution opens after you try, so you can do the next one yourself.
What if I’m really behind?
Start with Chapter 0. It covers the math the rest of the course leans on: units, conversions and solving for an unknown.
Will it match my class?
It covers the topics of a typical Chemistry I course, chapter by chapter. Use the topic finder to jump to what your class is on this week.
Where is my plan saved?
Only in this browser. Nothing is sent to us. Open ChemGem on a different phone or laptop and you’ll start fresh.
What do you need right now?
- Every chapter free
- No account
- No card
My school
Where are you studying chemistry?
Pick your school so we know where ChemGem is helping. It is optional and anonymous: no name, no email, no account.
Your school:
Saved on this device only. Change it
Search about 10,000 colleges and universities worldwide. Don’t see yours (or it’s a high school)? Type it in. We count schools only as totals, the same way we count visits by city.
Final exam prep
Get Me Ready: the Chemistry I final
Modeled on standardized first-term general chemistry finals: 70 questions, 110 minutes.
Questions go in course order, from math and atoms to gases. A periodic table and a constants sheet are provided. At the end you get your score by chapter and topic, with links to the free lessons to review.
- Timed or untimed
- Full feedback on every question
- Score by chapter and topic
The first 20 questions are free. The full 70-question final is $7.99 for 2 weeks.
Already bought it? Restore your purchase
Original ChemGem questions.
All questions
- R = 0.08206 L·atm·mol⁻¹·K⁻¹ = 8.314 J·mol⁻¹·K⁻¹
- NA = 6.022 × 10²³ mol⁻¹
- h = 6.626 × 10⁻³⁴ J·s
- c = 3.00 × 10⁸ m/s
- Specific heat of water = 4.184 J·g⁻¹·°C⁻¹
- 1 atm = 760 mmHg = 101.325 kPa
- T(K) = T(°C) + 273.15
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Practice
Test yourself
Testing yourself feels harder than rereading. That’s why it works.
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Every chapter is free.
Pick a set. Tap an answer to check it. Every wrong choice tells you which trap it was.
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Free samples
One question from five chapters
Try a sample question from Chapters 0, 1, 2, 4 and 5.
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Worked explanation
Flashcards
Every chapter is free.
Read the question, think of your answer, then tap the card to flip it and check.
Explain this card to me
Lessons
Pick a topic
Each topic shows what to look for in the question, a worked example step by step, and practice questions. Every chapter is free.
Practice final
Get the full practice final
Every chapter is already free. This is the one thing you can buy.
Full practice final · 2 weeks
$7.99
- Modeled on standardized first-term general chemistry finals: 70 questions, 110 minutes
- Timed or untimed
- Full feedback on every question
- Your score by chapter and topic, with links to review
Original ChemGem questions.
Restore a purchase
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