Energy transformations
Where does a pendulum have max potential and kinetic energy?
What causes atomic size to decrease across a period?
Why do atoms “shrink” as we move left to right?
Power vs energy
A 100 W bulb and a 60 W bulb are on for an hour. Which uses more energy?
Why does reactivity increase down alkali metals?
Why is cesium more reactive than sodium?
Mechanical advantage
Why do we use long handles in wrenches?
Why is fluorine the most reactive non-metal?
Even oxygen isn't as aggressive. Why?
Kinetic energy
Why does a fast-moving truck have more stopping distance than a slow car?
What is periodicity in properties?
Why do some properties repeat?
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?
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