Brain Train with Professor Labcoat #1

[OscarW]

Professor Labcoat is an educational game series dedicated to train and challenge your brain. In each game you'll find a collection of brain teasers, puzzles and memory games.

Play Here

Please use spoilers for hints and walkthroughs:
[spoiler=Title Here]Enter text here...[/spoiler]

Please do not post a video walkthrough for 7 days.

[graywolf]

Tried and failed; I got Q7 wrong.
It was fun trying!

[SueJ999]

"Wrong! This is not the correct combination!" Not sure which one(s) I got wrong...