See how it works
Watch a tutor work through a question.
Say what you're studying, choose a tutor, then work through your homework step by step, take a quick quiz or call your tutor. This one is IGCSE Maths, and every subject works the same way.
Six teaching styles
One chemistry question, six ways to teach it.
Each Chemistry tutor teaches differently. Choose one to see how they would start, then pick the style that suits you. You can switch tutor mid-chat.
Why does ice float on water?
Theo · Concept explainer
Picture the water molecules holding hands. When water freezes, they lock into a neat, open pattern with gaps in it, so ice takes up more room than the same amount of water.
Same mass, more room, so ice is less dense than water. Anything less dense than water floats. Does that picture make sense before we bring in hydrogen bonds?
How Theo teaches
- Starts from what you already know
- Uses everyday examples and simple pictures in words
- Checks the idea has clicked before moving on
Pick Theo when
a topic feels confusing, or you want to really understand it.
Why does ice float on water?
Priya · Step by step
We’ll build this up in three small steps.
Step 1: what decides whether something floats or sinks in water? Have a go, and I’ll check your answer before we move to step 2.
How Priya teaches
- Breaks every question into small steps
- Lets you try each step before showing the next
- Names the method so you can reuse it
Pick Priya when
you’re stuck on homework or a long, multi-step question.
Why does ice float on water?
Daniel · Exam coach
This often comes up as a 3-mark question. The marks go for:
1. Hydrogen bonds hold the molecules in an open lattice.
2. So ice is less dense than liquid water.
3. Less dense substances float on denser ones.
Examiner tip: write “less dense”, never “lighter”.
How Daniel teaches
- Works through past-paper style questions
- Explains command words and where the marks are
- Marks your answers the way an examiner would
Pick Daniel when
an exam is coming and you want to pick up every mark you can.
Why does ice float on water?
Yuki · Quick revision
Quick recap: ice is an open lattice held by hydrogen bonds. Open lattice means lower density (about 0.92 g/cm³ against 1.00 for water). Lower density means it floats.
Quick-fire: what bonds hold the lattice together?
How Yuki teaches
- Short recaps of the key points
- Memory hooks for facts and formulas
- Quick-fire recall questions
Pick Yuki when
you’re short on time and want to refresh a topic quickly.
Why does ice float on water?
Omar · Challenger
Before I explain, try this. Most solids sink in their own liquid: solid wax sinks in melted wax.
So what must be different about how water molecules arrange themselves when they freeze?
How Omar teaches
- Asks questions that make you reason it out
- Raises the difficulty as you improve
- Shows the harder versions examiners use
Pick Omar when
the basics feel easy and you’re aiming for top grades.
Why does ice float on water?
Lucia · Confidence builder
This one catches lots of people out, so you’re in good company.
Let’s start with something you already know: a full bottle of water can crack in the freezer. That tells us ice takes up more room than water. Shall we work out why together?
How Lucia teaches
- Starts from the basics, with no judgement
- Celebrates every step forward
- Turns mistakes into learning, calmly
Pick Lucia when
a subject makes you anxious, or you’ve fallen behind.
Topics students ask about
- Atomic structure and bonding
- The mole and calculations
- Acids, bases and salts
- Rates of reaction and equilibrium
- Energetics
- Electrochemistry
- Organic chemistry
- The periodic table
For your curriculum
Tell your tutor your curriculum and level, and it pitches everything to your syllabus.
- Cambridge IGCSE and O Level
- Edexcel and AQA IGCSE
- GCSE (AQA, OCR)
- Cambridge, Edexcel and AQA A Level
- IB Diploma
- Singapore Secondary, IP and JC
- Hong Kong syllabus
Recorded your chemistry class?
Chemistry lessons are full of definitions and reaction conditions. The flashcards made from your lesson pull them out so you can drill them.
Studying chemistry for an exam?
See how your paper is assessed, what’s on the syllabus, and an exam-style question marked mark by mark.
FAQ
Chemistry questions, answered.
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