Please help me answer these problems! Thank you!

7) Fill in the blank: If plastic is less dense than the solution it is placed in, it will 8) Fill in the blank: If a plastic has the same density as the solution in it, it will 9) Name 2 physical properties utilized in the identification of plastics. 10) Explain the phenomenon known as swelling. 11 11) Captain Planet is a strong advocator for keeping our planet safe and clean. Captain Planet wants to teach his planeteers all about recycling. He invites you to join his lab. Captain Planet asks someone in the lab for the objectives of the lab. With great enthusiasm you raise your hand and tell him the objectives. Please write below the 5 objectives that you would tell Captain Planet and his planeteers. (5 points total)