What causes atomic size to decrease across a period?
Why do atoms “shrink” as we move left to right?
Why does reactivity increase down alkali metals?
Why is cesium more reactive than sodium?
Why is fluorine the most reactive non-metal?
Even oxygen isn't as aggressive. Why?
What is periodicity in properties?
Why do some properties repeat?
Why are transition metals special?
Why are iron, copper, and zinc called transition metals?
Why is hydrogen tricky to place?
Is it like alkali metals or halogens?
How does modern periodic law differ from Mendeleev's?
What's changed since his time?
What's the link between valency and group number?
How does group number predict bonding?
Why do we write chemical equations?
Why can't we just describe reactions in words?
What are the signs that a chemical reaction has occurred?
How can you “see” chemistry happening?
What's the difference between balanced and unbalanced equations?
Why do teachers stress balancing?
Why do we add HCl to zinc in the lab?
What's the reaction behind it?
Why does an iron nail turn brown in copper sulfate solution?
Is this magic or chemistry?
Why do food packets have “silica gel” inside?
What's the chemistry behind it?
Why does limewater turn milky when CO₂ is passed?
What forms the white color?
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