TEKS: 5.1 (A): Lab Safety - Test 2

1. When entering the science lab a student sees the science equipment on the table. The student should -

Turn on the bunsen burner

Mix the chemical that are on the table

Begin cleaning the table

Wait for the teacher to give instructions

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Explanation

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2. A student breaks a glass beaker while working on an investigation. The student should now -

Ask his partner for help cleaning the beaker

Clean the glass up himself

Leave the glass on the table and floor and continue working

Inform the teacher about the broken beaker

The correct answer is to inform the teacher about the broken beaker. This is the most responsible and appropriate action to take in this situation. The teacher needs to be notified so that they can ensure the broken glass is cleaned up properly and that no one gets injured. Additionally, the teacher may need to provide a replacement beaker for the student to continue their investigation.

Explanation

The correct answer is to inform the teacher about the broken beaker. This is the most responsible and appropriate action to take in this situation. The teacher needs to be notified so that they can ensure the broken glass is cleaned up properly and that no one gets injured. Additionally, the teacher may need to provide a replacement beaker for the student to continue their investigation.

3. Tongs should be used in the lab when -

Working with water

Working with sand

Working with hot objects

Working with a microscope

Tongs should be used in the lab when working with hot objects because they provide a safe way to handle materials that are too hot to touch with bare hands. Tongs have insulated handles that protect the user from burns and allow them to grip and manipulate hot objects without direct contact. This helps to prevent accidents and injuries in the lab and ensures the safety of the experimenter.

Explanation

Tongs should be used in the lab when working with hot objects because they provide a safe way to handle materials that are too hot to touch with bare hands. Tongs have insulated handles that protect the user from burns and allow them to grip and manipulate hot objects without direct contact. This helps to prevent accidents and injuries in the lab and ensures the safety of the experimenter.

4. When using a microscope one should be careful not to -

Point the mirror directly to the sun

Look at tiny organisms

Allow your partner to look through it as well

Clip the slides correctly

When using a microscope, it is important not to point the mirror directly to the sun. This is because the intense light from the sun can damage the microscope and potentially harm the user's eyes. The mirror in a microscope is used to reflect light onto the specimen, but directing sunlight through the microscope can cause excessive heat and potentially lead to a fire. Therefore, it is crucial to avoid pointing the mirror directly at the sun while using a microscope.

Explanation

When using a microscope, it is important not to point the mirror directly to the sun. This is because the intense light from the sun can damage the microscope and potentially harm the user's eyes. The mirror in a microscope is used to reflect light onto the specimen, but directing sunlight through the microscope can cause excessive heat and potentially lead to a fire. Therefore, it is crucial to avoid pointing the mirror directly at the sun while using a microscope.

5. Running around the classroom could cause all of the following except -

Students to get hurt

Students to finish their work faster

Students to break glass containers

Students to cause an accident

Running around the classroom is unlikely to cause students to finish their work faster. This is because running around can be distracting and may lead to a lack of focus and productivity. Instead, it is more likely to cause accidents, potential injuries, and damage to glass containers.

Explanation

Running around the classroom is unlikely to cause students to finish their work faster. This is because running around can be distracting and may lead to a lack of focus and productivity. Instead, it is more likely to cause accidents, potential injuries, and damage to glass containers.

6. Aaaa

A

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Explanation

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7. Latex gloves should be worn in all of the following situations except -

Working with dangerous chemicals

When working with high temperatures

When working with cold temperatures

When dissolving water and sugar

Latex gloves should be worn in all situations mentioned except when dissolving water and sugar. This is because water and sugar are not dangerous chemicals, nor do they involve high or cold temperatures that could harm the hands. Therefore, wearing latex gloves is unnecessary in this specific situation.

Explanation

Latex gloves should be worn in all situations mentioned except when dissolving water and sugar. This is because water and sugar are not dangerous chemicals, nor do they involve high or cold temperatures that could harm the hands. Therefore, wearing latex gloves is unnecessary in this specific situation.

8. Sasaa

A

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Explanation

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