Why is Avogadro's number so huge?
6.022×10236.022 \times 10^{23} particles in one mole — why such a big number?
Photoelectric effect
Why do automatic doors open when you walk up to them?
How to calculate molecular mass easily?
For example, what's the molecular mass of H₂O?
Nuclear fusion
Why is fusion considered the “holy grail” of clean energy?
Why is valency important in writing formulas?
Why do we write H₂O, not HO₂?
Lasers in medicine
How do lasers perform delicate eye surgeries without cutting?
What happens if we mix 1 mole of hydrogen with 1 mole of oxygen?
Do we directly get H₂O?
Uniform motion
A train moves at 60 km/h for 2 hours. Is its motion uniform?
Why are chemical symbols universal?
Couldn't we just write “water” instead of H₂O?
Non-uniform motion
A cyclist speeds up, slows down, and turns corners. Is this uniform motion?
What's the difference between atoms and molecules?
Are oxygen and O₂ the same thing?
Distance vs displacement
If you jog 200 m around a circular park and return to the starting point, what's your distance and displacement?
Why is ozone O₃ instead of O₂?
Oxygen is O₂, so why does ozone have three atoms?
Average speed
You drive 30 km at 60 km/h and another 30 km at 30 km/h. Is your average speed 45 km/h?
How to find the number of moles in a sample?
Example: How many moles in 36 g of water?
Study Materials
Access comprehensive notes, guides, and resources to excel in your studies