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Conservation of energy
Can a roller coaster ever climb higher than its starting point without external energy?
Why are transition metals special?
Why are iron, copper, and zinc called transition metals?
Horsepower
Why do sports cars advertise “400 HP engines”?
Why is hydrogen tricky to place?
Is it like alkali metals or halogens?
Potential energy
Does lifting a book and holding it at height involve energy?
How does modern periodic law differ from Mendeleev’s?
What’s changed since his time?
Efficiency
Why are machines never 100% efficient?
What’s the link between valency and group number?
How does group number predict bonding?
Gravity basics
Why does the Moon not fall onto Earth if gravity attracts it?
Why do we write chemical equations?
Why can’t we just describe reactions in words?
Acceleration due to gravity
Does g = 9.8 m/s² everywhere on Earth?
What are the signs that a chemical reaction has occurred?
How can you “see” chemistry happening?
Weightlessness in orbit
Why do astronauts feel weightless inside the ISS?
What’s the difference between balanced and unbalanced equati...
Why do teachers stress balancing?
Tides
How does the Moon cause ocean tides?
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