How do you properly dispose of chemicals not needed in the experiment?
Correct answer: D. Dispose of chemicals in proper places and follow posted procedures without returning them to their original containers.
- A. The rule is to add concentrated acid to water slowly.
- B. The rule is to add water to the concentrated acid slowly.
- C. Carefully replace unused or excess chemicals into their properly labeled containers from which they came.
- D. Dispose of chemicals in proper places and follow posted procedures without returning them to their original containers.
Explanation
Dispose of chemicals in proper places and follow posted procedures without returning them to their original containers. Unused or excess chemicals should not be returned to stock bottles to avoid contamination. They must be disposed of according to lab safety guidelines in designated waste containers. This ensures safety and prevents chemical reactions or accidents.
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About Experimental Techniques in Chemistry
Separation methods are selected according to differences in solubility, particle size, volatility and sublimation behaviour. Filtration and crystallisation separate insoluble or dissolved solids, sublimation isolates suitable volatile solids, distillation separates liquids by boiling point, and solvent extraction transfers a substance between immiscible solvents.
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More Experimental Techniques in Chemistry questions
A filtration process could be very time consuming if it were not aided by a gentle suction, which is developed:
The diagram shows a conical flask connected to a funnel fitted with filter paper. Which piece of apparatus ensures faster separation of the filtrate under reduced pressure?
In a distillation to separate two liquids with boiling points of 80°C and 100°C, why are anti-bumping granules added?
In the experimental setup shown, the beaker contains a clear liquid labeled X obtained after filtration. Which of the following correctly identifies the substance labeled X?
In the crystallization setup shown, the solution has been gently heated to reach the point of saturation. What should be the next correct step to obtain pure crystals?
During the sublimation process illustrated, vapors condense on the cold surface labeled X. Which substance is most likely collected at this point?