I have received a science assessment where I am to perform my own investigation and to present my findings in a report.

 

Before I can conduct my experiment I must complete a proposal.

 

My aim is to determine what substance is best for removing tarnish from silver.

 

I am having some troubles with answering and finding answers to these two particular questions.

 

1. "Identify scientific concepts involved in your investigation."

2. "Identify any previous research done by other scientists on your investigation"

 

It would mean a lot to me if someone could help me with these two questions.

Question 1 would be answered (partly) by explaining what tarnish is, chemically, and what kinds of reactions would remove it.

 

Question 2 would be answered by identifying some commercially-available tarnish removers, since (presumably) the scientists working for those companies researched it. You might also search for household-hints for removing tarnish.