CHEM 343 QUIZ 2 QUESTIONS AND ANSWERS FULLY SOLVED

CHEM 343 QUIZ 2 QUESTIONS AND ANSWERS FULLY SOLVED - - Answers BOILING POINT • the temperature at which the VAPOR PRESSURE of the liquid equals the ATMOSPHERIC PRESSURE BOILING POINT • the temperature at which the VAPOR PRESSURE of the liquid equals the ATMOSPHERIC PRESSURE - Answers BOILING POINT • the temperature at which the _________ of the liquid equals the _________ the temperature at which the VAPOR PRESSURE of the liquid equals the ATMOSPHERIC PRESSURE - AnswersWhat is the boiling point of a liquid? 1) to allow more SECURE clamping of the thermometer 2) the thermometer could SNAP - Answers1) What is the purpose of the thermometer adapter? 2) What could happen if the adapter were not used? - - Answers MICROSCALE METHOD (SIWOLOBOFF'S METHOD) 1) Take a small test tube, strap it to a thermometer with a rubber band, and put ≈4-5 drops of your unknown into the test tube 2) Insert a melting-point capillary tube into your test tube OPEN END DOWN into your unknown 3) Clamp the thermometer so that the thermometer bulb, the test tube, and the open-end-down melting-point capillary in it are ALL in a WATER bath on top of a HOT PLATE 4) As you heat your unknown, you will notice the AIR in the CAPILLARY EXPAND, and a very SLOW stream of BUBBLES will start to escape the CAPILLARY as the air leaves it 5) At some point, the BUBBLES will stream FASTER as the LIQUID UNKNOWN begins to BOIL 6) After A WHILE, remove the heat 7) Allow your boiling liquid to COOL 8) AS SOON AS THE UNKNOWN LIQUID enters the CAPILLARY, read the thermometer to obtain the FIRST value of the boiling range 9) When the unknown liquid FILLS the tube, read the thermometer AGAIN to obtain the SECOND value of the boiling range when you begin to see a RAPID stream of bubbles from the capillary tube - AnswersWhen do you remove the micro boiling-point apparatus from the hot plate? when unknown liquid FIRST ENTERS the capillary after your unknown liquid has been removed from heat and allowed to cool - AnswersWhen do you obtain the first value of the boiling range? when unknown liquid COMPLETELY FILLS the capillary - AnswersWhen do you obtain the second value of the boiling range?