Hello there! Here are the answers you're looking for!
1: displacement reaction
2: (I can't really answer this one for you because i don't know what the items you used in your lab were, But ill just say Highly Toxic Chemicals)
3: a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
4: (same thing here, i don't know what your lab was about! So i cant answer how it was used here.)
Sorry, i could not answer 2 of them, But hopefully, you get a good grade! Hope this helps!!