Tutor profile: Ridwan H.
Subject: Organic Chemistry
How can ethanol be obtained ONLY from cracking?
Pass steam at 300°C through ethene in a vessel, with the presence of Phosphoric Acid catalyst to speed the reaction up. Ethanol is the only product formed and a pure sample can be extracted by menas of fractional distillation.
Three 500ml beaker each containing one of HCl, HBr and HI solutions. The labels have been misplaced, describe an experiment to identify the solutions.
Process: 1) Extract 10ml of each sollution and place in three seperate measuring cylinders 2) Using distilled (de-ionized) water, dilute the solution to 30ml 3) Add nitric acid to each of the solutions in excess to neutalise any carbonate ions that could render the results inaccurate. 4) Add 5 drops of Silver Nitrate to each cylinder. Observation White, Pale Yellow and Cream precipitates (ppt) should form. Results: the solution with white ppt contained HCl the solution with pale yellow ppt contained HI the sollution with cream ppt contained HBr Safety Precautions: Wear gloves and safety goggle Notes: **silver nitrate is added as the sollution contains Nitric Acid and thus the results will npt be tampered with impurities.**
Describe Terminal Velocity.
When an object is in free fall in a fluid(gas or liquid), it will continue to accelerate against the fluid until the fluid resistance (ex: air resistance) is equal to that of the acceleration of the object. This phenomenon results in the object continuing to decend at a steady speed as the amount it is accelerating is equal to the amoumt it is decelerating or in other words, the downward pull(weight) on the object is equal to the upward push(air resistance). This can be described as terminal velocity.
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