1. (9 letters) How about STIMULATE?
2. RECEIVE = CI
3. (5 letters) How about ACUTE?
4. (6 letters) Seems to be something about factors, "wow factor" but how could that be reduced? EXCITE?
5. (5 letters) Maybe something to do with citric acid reacting with a base to release co2 or simply REACT?
Good puzzle!
4. Factor
Docs guesses have already covered my guesses at the moment..lol
Nice puzzle.
Doc is on the right track for 3 and 4, very close in fact. You will want to focus on wow factor, the answer is a similar word to it.
Clue 1 is more about the sense of the image than the actual act.
For 5, keep in mind that all elements of the clue are important. The second image is different than you're thinking. The two together will point you to the answer.