The chemistry question involved balancing the equation. Both sides have to have equal numbers of carbon, hydrogen and oxygen. The IMDb question was kind of lame, who memorizes ratings from one of many, many movie rating sites?

Those were the ones I got wrong

Or the completely random "A group of four people drinking tea with two people of them playing chess and one reading a book", which apparenly has "Uno" as the correct answer. I mean, what? I went for "darts" on the grounds that it's a two player game with British (tea) associations.

I think it's that there are 4 people, and Uno is the only activity that inherently supports four players?

I thoughts it was about game night with friends, so I chose the cards.

I thought it was a representation of Japan's flag, and Japan means cherry tree flowers

I saw it as either Christmas or Lunar New Year which both occur in winter.

I lucked out on the band one. Just randomly guessed XD

The planet is Neptune and that's the symbol for Neptune. It looks like a trident because Neptune was the Roman god of the sea (he was the Roman version of the Greek god Poseidon)

Neptune and winter/Christmas?

Blue sphere is a planet of oceans associateed with God Neptune. And gifts are associated with christmas which is (for most) in winter.

Apparently the trident one is the symbol for Neptune: “The planetary symbol was Neptune's trident, with the handle stylized either as a crosshatch , following Mercury, Venus, Jupiter, Saturn, and the asteroids, or as an orb , following the symbols for Uranus, Earth, and Mars. The crosshatch variant is the more common today.”

Not the gift but the present. Present season being winter.

They are all basketball players apart from the white guy. That is Harry Kane, a British footballer.