3. You acquired the following data: bp 173 °C; - Tollens', + iodoform tests; semicarbazone mp 105 °C. You are very confident that your unknown is 2- octanone. Data is spot on, excluding the semicarbazone mp. You suspect the suppressed mp is due to wet crystals. What process or technique (other than continued oven drying) can help you obtain more pure semicarbazone and thus a more accurate mp for comparison? Please write answer in box at right.

powders and granules dosage forms have faster dissolution rate than capsules and tablets  ,why?

What is hard water? What are the main problems combining soap and hard water?

A mixture of copper and tin, commonly called bronze is a homogeneous mixture or a ____________ solution.

Why is it best to cool a solution slowly as a solid crystallizes? impurities are more likely to crystallize as well when done quickly the solid obtained will have a higher purity when done quickly no solid will form when done quickly the solvent could start to boil again when done quickly

Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also?

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.

Explain why air is classified as a solution and oxygen is classified as a pure substance.

Describe why adding a solvent would either lower the vaper pressure of raise the boiling point.

Determine if crystalline sodium chloride and water are incompatible. If they are incompatible, state the hazardous conditions which would result from mixing the wastes.