In its natural form,_______ is in the form o blue crystals.

Silicone is made of quartz. true or false

What defects are present in this picture

Glue used to attach labels to bottles are classified as

From your life, identify several object that made of polymer?

B. SOLID TO GAS Place a few crystals of iodine in a dry test tube. Heat the tube and note the changes. Cool the tube. Observations: What happens when the tube is heated? What is this substance? Does any iodine melt? What is formed on cooling the tube? What is this process called? Define it. Name another substance that could undergo such a process.

Part A One kind of polyester is a condensation copolymer formed between terephthalic acid and ethylene glycol (Figure 1). Draw the structure of the dimer. [Hint: Water (circled) is eliminated when the bond between the monomers forms.] Draw the molecule on the canvas by choosing buttons from the Tools (for bonds and charges), Atoms, and Templates toolbar= gure 206 Terephthalic acid HO–CH,CH, OH Ethylene glycol 1 of 1 050 Δ HD EXP CONT. * Submit Previous Answers Request Answer × Incorrect; Try Again; 5 attempts remaining Part B Complete previous part(s) Provide Feedback H C S CI Br 1