Atoms & Reactions
T
Chemical Reactions
Push a bit harder. Apply what you know to less familiar problems.
Combined Science · Medium
5
questions · ~4 min · 3 hints each (−5 pts)
Confidence tracking, 3-tier hints and instant feedback.
What you'll learn
Each question helps you build key knowledge and skills.
- 1Reactants form products in a reaction.
- 2Mass is conserved - atoms are just rearranged.
- 3Balancing equations: same number of each atom on both sides.
- 4Acids + metals → salt + hydrogen.
Question mix
A mix of question types to build your skills.
- Multiple choice×3
- True / False×1
- Short answer×1
Different question types help you think in different ways.
How it works
A simple 3-step process
- 1
Rate your confidence
Tell us how sure you feel before answering. It helps us understand your starting point.
- 2
Use hints if stuck
Get up to 3 helpful hints per question. Each hint costs 5 Treasure Points.
- 3
See what went wrong
Get instant feedback with clear explanations, so you can learn and improve.
Ready when you are
This takes about 4 minutes.

