Nature Of Science: Safety

2.

During a scientific investigation, Max spills a few small drops of a chemical on his arm. Which of the following should Max do FIRST?

Put gloves on over his hands.
Rinse his arm with water and inform his teacher
Clean up the other spilled drops before anyone else is hurt.
Look in his notes to find out if the chemical was dangerous.

Correct Answer

A. Rinse his arm with water and inform his teacher

Explanation

Max should rinse his arm with water and inform his teacher first because it is important to immediately remove any chemical substance from the skin to prevent further absorption or damage. Informing the teacher is necessary so that appropriate measures can be taken to ensure Max's safety and provide any necessary medical attention if required.

Rate this question:

3.

Your lab group has completed the first of many water sampling activities. Empty sample bottles, pipettes, and microscope slides used during the activity remain on the lab counter. The best lab practice is to --

Wipe the glassware with paper towels
Leave the materials exactly where they are for the next sampling activity
Turn the sample bottles and pipettes upside down to drain and dry
Wash all the supplies with detergent, rinse thoroughly, and allow them to dry

Correct Answer

A. Wash all the supplies with detergent, rinse thoroughly, and allow them to dry

Explanation

The best lab practice is to wash all the supplies with detergent, rinse thoroughly, and allow them to dry because this ensures that any residue or contaminants are removed from the glassware. Wiping with paper towels may not effectively clean the equipment and could leave behind particles or chemicals. Leaving the materials as they are could lead to contamination in the next sampling activity. Turning the sample bottles and pipettes upside down may help drain them, but it does not clean them. Washing with detergent, rinsing, and allowing them to dry ensures that the equipment is thoroughly cleaned and ready for future use.

Rate this question:

4.

Sarah’s lab group is trying to determine the identity of four unknown powders. Below are each student’s suggestions about how to test the powders.Which student’s suggestion is the safest way to begin?

Sarah
David
Lena
Kesha

Correct Answer

A. Kesha

Explanation

Kesha's suggestion is the safest way to begin because the question asks for the safest method. Without any specific details about the suggestions of each student, it is impossible to provide a more detailed explanation.

Rate this question:

5.

Students were asked to observe pond organisms in a Petri dish. At the end of class, which of these is the MOST appropriate clean -up method?

Wipe the lab bench with a paper towel, and rinse hands with alcohol.
Wipe the lab bench with dry brush, and dry hands with a paper towel.
Wipe the lab bench with disinfectant, and wash hands with soap and water.
Wipe the lab bench with a paper towel, and wash hands with soap and water.

Correct Answer

A. Wipe the lab bench with disinfectant, and wash hands with soap and water.

Explanation

The most appropriate clean-up method is to wipe the lab bench with disinfectant and wash hands with soap and water. This is because disinfectant will effectively kill any potential pathogens or microorganisms that may have been present on the lab bench. Washing hands with soap and water is important to remove any remaining contaminants and ensure proper hygiene.

Rate this question:

6.

While working in the lab, Shelia masses 20 g of sodium hydroxide on the triple beam balance then masses 20 g of sodium bicarbonate. Both are white powders but react to other chemicals in very different ways. Shelia is not certain which white powder is the sodium hydroxide. What should she do?

Place both powders in the trash and start over
Place a drop of water on a small amount of each powder and observe
Proceed with the experiment
Check with her teacher for guidance

Correct Answer

A. Check with her teacher for guidance

Explanation

Shelia should check with her teacher for guidance because she is unsure which white powder is sodium hydroxide. The teacher will have the knowledge and expertise to help Shelia identify the correct powder and provide guidance on how to proceed with the experiment. This is the best course of action to ensure accuracy and safety in the lab.

Rate this question:

7.

What does this symbol indicate about a chemical?

It can cause injury to body tissue
It is unstable in water
It catches fire easily
It is hazardous to the environment

Correct Answer

A. It can cause injury to body tissue

Explanation

The symbol indicates that the chemical can cause injury to body tissue. This means that if the chemical comes into contact with the skin, eyes, or any part of the body, it can cause harm or damage. It is important to handle such chemicals with caution and take necessary safety measures to avoid any injury.

Rate this question:

8.

Mrs. Price reviewed the safety precautions for working with sharp objects. Which activity most likely requires following these safety practices?

Determining the mass of an empty beaker
Scooping 20 g of chemical powder from a storage container
Constructing a model of an animal cell
Viewing a stained slide with a microscope

Correct Answer

A. Constructing a model of an animal cell

Explanation

Constructing a model of an animal cell most likely requires following safety practices when working with sharp objects. This activity may involve using tools such as scissors, knives, or blades to cut and shape materials for the model. Therefore, it is important to take precautions to prevent accidents and injuries, such as wearing gloves, using protective eyewear, and handling the sharp objects with care.

Rate this question:

Nature Of Science: Safety

Which of these is an example of an unsafe practice in a lab or classroom?

Quiz Preview

During a scientific investigation, Max spills a few small drops of a chemical on his arm. Which of the following should Max do FIRST?

Your lab group has completed the first of many water sampling activities. Empty sample bottles, pipettes, and microscope slides used during the activity remain on the lab counter. The best lab practice is to --

Sarah’s lab group is trying to determine the identity of four unknown powders. Below are each student’s suggestions about how to test the powders.Which student’s suggestion is the safest way to begin?

Students were asked to observe pond organisms in a Petri dish. At the end of class, which of these is the MOST appropriate clean -up method?

While working in the lab, Shelia masses 20 g of sodium hydroxide on the triple beam balance then masses 20 g of sodium bicarbonate. Both are white powders but react to other chemicals in very different ways. Shelia is not certain which white powder is the sodium hydroxide. What should she do?

What does this symbol indicate about a chemical?

Mrs. Price reviewed the safety precautions for working with sharp objects. Which activity most likely requires following these safety practices?