Why is it important to have the exact amount of chemicals measured in a reaction container?

D. The study of chemistry requires weighing, measuring and mixing chemicals in accurate amounts. Such activities allow you to examine different types of matter and how they react with others. When chemistry results are not what are expected, there are several common sources of error.

Should you taste chemicals in the laboratory?

Laboratory chemicals should never be tasted. A pipette bulb or aspirator should be used to pipette chemicals or to start a siphon; pipetting should never be done by mouth. Hands should be washed with soap and water immediately after working with any laboratory material, even if gloves have been worn.

Why should you never return excess chemicals in the reagent bottle What will you do in order not to waste chemicals?

Never return unused chemicals to the reagent bottles. This is a source of possible contamination of the entire contents of the stock bottle. Dispose of unused chemicals exactly as instructed in the waste disposal instructions for that substance, identified by throughout each experiment.

What safety precautions do you need to follow when doing chemical experiments?

They are really, truly for your safety and not your humiliation.

• Do Not Pipette By Mouth – Ever.
• Read the Chemical Safety Information.
• Dress Appropriately.
• Identify the Safety Equipment.
• Don’t Taste or Sniff Chemicals.
• Don’t Casually Dispose of Chemicals Down the Drain.
• Don’t Play Mad Scientist.

Why would it be important to know the ratio of substances?

Mole ratios are important because mole ratios allow you change moles of a substance to moles of another substance. The mole ratio is the magic that changes from A to B. The mole ratios come from the chemical formula or equation.

What is a small tube used to hold liquids in an experiment?

A pipette, also known as a chemical dropper, is a glass or plastic tube used to suction small amounts of liquid to enable to transfer the liquid from one place another. They come in different types, each used for a specific purpose either for laboratory experiments or medical tests.

Why is laboratory safety important?

The purpose of this is to help the lab students to understand proper laboratory safety, to increase their awareness of the possible risks or hazards involved with laboratory work and to realize the laboratory is generally a safe place to work if safety guidelines are properly followed. …

Why is it important to recap bottles and reagents?

Always replacing bottle tops as soon as you have finished dispensing reagents since many compounds react with moisture in the air, with oxygen or with carbon dioxide. Others are volatile and evaporate. If you do remove the reagent from the common work area temporarily, replace it as soon as possible.

How important is the proper handling of chemicals?

Handling chemical substances without proper protection exposes the worker to the risk of absorbing harmful amounts of chemical through the skin. This usually happens when handling the chemical in liquid form. Dust may also be absorbed through the skin if it is wetted by, for instance, sweat.

Why is it important to have safety rules in a science lab?

Since almost every lab uses chemicals of some sort, chemical safety rules are a must. Following these policies helps employees avoid spills and other accidents, as well as damage to the environment outside of the lab.

What is the purpose of lab safety?

The purpose of the Laboratory Safety Program is to minimize the risk of injury or illness to laboratory workers by ensuring that they have the training, information and support needed to work safely in the laboratory.

What are the safety precautions to be taken during a lab experiment?

Be alert. Notify the instructor immediately if you notice unexpected chemical reaction of your experiment or any unsafe condition. Experiments must be monitored while reactions are taking place or when heating. Do not leave a lit Bunsen burner unattended. Absolutely, no noise or disruptive behavior in the lab. No fooling around.

What should you not do when smelling chemicals?

Do not touch, eat, or smell any chemical unless instructed to do so. When instructed to smell a chemical, you need to fan the air above the chemical toward your nose. Do not sniff the chemical directly by bringing it close to your nose. If you do so, the odor may badly irritate your nasal passage.

How do chemists test for elements and compounds?

The former is usually accomplished using elemental analysis, mass spectroscopy, X-ray crystallography or some spectroscopic method. Sometimes it is sufficient to show only that certain ions or elements are present in a sample, and in this case a chemist will perform a qualitative test.

What are the rules of the chemistry lab?

General Rules of Conduct Students are not permitted in the chemistry lab without the presence of the instructor. No student may work in the lab without the instructor’s supervision. Only the authorized scheduled experiment can be performed in the lab. No unauthorized experiment is allowed.