Chemical Laboratory

What should you do if any chemicals come into contact with your skin?

• Immediately rinse the affected area with plenty of cold water for at least 15 minutes.

• Wipe the affected area with wet tissue.

• Straightly meet the doctor to seek medical attention.

• Neglect it since there is no effect with the affected area

Explain the proper way to dispose of the used chemicals after the experiment.

• Pour the chemical waste into the sink.

• Pour the chemical waste in the designated waste containers.

• Let the laboratory assistant clean up the chemical waste.

• Pour the chemical waste into the original container.

When using the dropper, these are the steps to prevent contamination of the chemicals EXCEPT

• Never insert the dropper into a reagent bottle containing another chemical.

• Always use a clean dropper for each reagent.

• Throw away the dropper into the bin after used and replace with a new dropper for each preparation of sample.

• Avoid touching the dropper tip to any surface except the solution you are transferring.

These are the steps to measure the volume of liquids accurately using a measuring cylinder EXCEPT

• Place the measuring cylinder on a level surface.

• Transfer the liquid into the cylinder by using a beaker.

• Pour the liquid into the cylinder slowly and carefully.

• Read the volume at eye level, ensuring the bottom of the meniscus (the curved surface of the liquid) is aligned with the graduation mark.

What precautions should be taken when handling bromine water?

• Avoid inhaling the fumes.

• Work in a well-ventilated area.

• Wear gloves and avoid skin contact as bromine water is corrosive.

• Transfer the bromine water into the beaker and let it exposed to the work area.

How can you avoid breakage of the test tubes during the experiment?

• Handle test tubes gently and avoid sudden temperature changes.

• Put the test tubes on the table without using the test tube rack.

• Do not strike test tubes against hard surfaces.

• Use test tube holders or clamps when heating or handling hot test tubes.

Explain the importance of cleaning and drying all glassware after the experiment.

• To prevent contamination of future experiments.

• To ensure the accuracy of future measurements.

• To save the cost of spending on the purchase of new equipment.

• To maintain the integrity and longevity of the laboratory equipment.

Gloves should be worn when handling _____________ to prevent skin contact and irritation.

Bromine water is an oxidizing agent and reacts with alkenes to produce a _____________ color.

Cyclohexane and cyclohexene are _____________ and should be handled in a well-ventilated area.