Question

1. state whether each of the following laboratory instructions is true or false.

(a) do the prelaboratory assignment after coming to laboratory and check your answers in appendix.
(b) record your observations directly in the data table; do not record data on loose scraps of paper.
(c) dispose of chemicals in a designated container for chemical waste.
(d) dispose of broken glass in a designated container for broken glass.
(e) use distilled water when performing an experiment.
(f) clean glassware with tap water and rinse with distilled water.
(g) never place chemicals directly on a balance pan.
(h) never place hot objects on a balance pan.
(i) allow heated glassware to cool before touching.
(j) clean your lab station and equipment after completing the experiment.

1. what should you do if any chemical comes in contact with your skin?
2. what safety precautions must be observed in this experiment?

Explanation:

(a) The pre - laboratory assignment should be done before coming to the lab, so this is false.
(b) Recording directly in the data table and not on loose scraps is good practice, so true.
(c) Chemicals should be disposed of in designated waste containers for safety and environmental reasons, so true.
(d) Broken glass should be disposed of in a special container to prevent injury, so true.
(e) Using distilled water in experiments is often necessary to avoid impurities, so true.
(f) Cleaning glassware with tap water first and rinsing with distilled water is a common procedure, so true.
(g) Placing chemicals directly on a balance pan can damage it and cause inaccurate measurements, so true.
(h) Placing hot objects on a balance pan can damage it, so true.
(i) Heated glassware can cause burns if touched immediately, so true.
(j) Cleaning the lab station and equipment after an experiment is proper lab etiquette and safety, so true.
For the chemical - on - skin question, immediately flush the affected area with large amounts of water for at least 15 minutes and inform the instructor. General safety precautions include wearing appropriate PPE (lab coat, goggles, gloves), knowing the location of safety equipment like eyewash stations and fire extinguishers, and following all instructions carefully.

Answer:

(a) False
(b) True
(c) True
(d) True
(e) True
(f) True
(g) True
(h) True
(i) True
(j) True
If any chemical comes in contact with your skin, immediately flush the affected area with large amounts of water for at least 15 minutes and inform the instructor.
General safety precautions: Wear appropriate PPE (lab coat, goggles, gloves), know the location of safety equipment, follow instructions carefully.