Quiz #1 Review- lab safety, equipment, & metric conversions

Which procedure is most appropriate for handling a chemical spill in the laboratory?

• Continue working and clean up later.

• Notify the teacher immediately and follow established cleanup procedures.

• Leave the lab without informing anyone.

• Attempt to clean the spill yourself without any protective equipment.

Answer explanation

The correct procedure is to notify the teacher immediately and follow established cleanup procedures. This ensures safety and proper handling of the chemical spill, unlike the other options which are unsafe.

Why is it critical to use safety goggles during laboratory experiments?

• They enhance visual acuity for better observation.

• They provide protection against chemical splashes and debris.

• They prevent eye strain from prolonged exposure to bright lights.

• They help in maintaining focus on the experiment.

Answer explanation

Using safety goggles is critical as they provide protection against chemical splashes and debris, safeguarding your eyes from potential harm during laboratory experiments.

What is the correct procedure for heating a test tube containing a chemical?

• Seal the test tube tightly with a stopper and heat it.

• Heat the test tube with a Bunsen burner while pointing it away from yourself and others.

• Hold the test tube in your hand while heating to control the temperature.

• Use a hot plate to heat the test tube and cover it with a cloth.

Answer explanation

The correct procedure is to heat the test tube with a Bunsen burner while pointing it away from yourself and others. This ensures safety by preventing exposure to heat and potential splashes.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-3

Which piece of safety equipment should be used immediately if a chemical splashes into your eyes?

• Fire extinguisher

• Fire blanket

• Eyewash station

• Safety shower

Answer explanation

If a chemical splashes into your eyes, the immediate response should be to use the eyewash station. It provides a steady flow of water to rinse the eyes and minimize damage, unlike other equipment which is not suitable for this emergency.

When should a fire blanket be used in the lab?

• To extinguish small fires on equipment or clothing.

• To cover a broken beaker.

• To protect your eyes from chemical splashes.

• To clean up spills on the floor.

Answer explanation

A fire blanket is specifically designed to extinguish small fires on equipment or clothing by smothering the flames. It is not suitable for covering broken glass, protecting eyes, or cleaning spills.

How should you use an eyewash station if chemicals get into your eyes?

• Flush your eyes with water for at least 15 minutes while holding your eyes open.

• Rub your eyes vigorously to remove the chemicals.

• Use a clean cloth to wipe the chemicals away.

• Apply eye drops to alleviate irritation.

Answer explanation

If chemicals get into your eyes, the correct action is to flush your eyes with water for at least 15 minutes while holding your eyes open. This helps to thoroughly remove the chemicals and prevent further irritation.

What is the appropriate action to take if you accidentally catch fire in the lab?

• Run out of the lab immediately.

• Stop, drop, and roll, or use the fire blanket to extinguish the flames.

• Use the safety shower to rinse off.

• Use the fire extinguisher on yourself.

Answer explanation

If you catch fire in the lab, the best action is to stop, drop, and roll to extinguish the flames or use a fire blanket. Running out may spread the fire, and using a fire extinguisher on yourself is not safe.

What is the most appropriate tool to measure the length of a small object with precision?

• Graduated cylinder

• Triple beam balance

• Metric ruler

• Meter stick

Answer explanation

A metric ruler is the most appropriate tool for measuring the length of small objects with precision, as it provides clear markings in millimeters and centimeters, allowing for accurate measurements.

To find the mass of an object using a triple beam balance, you should:

• Place the object on the pan and adjust the weights until the balance is level.

• Directly read the mass from the scale with the object in place.

• Calculate the mass by measuring the volume and density of the object.

• Use a graduated cylinder to determine the object’s mass.

Answer explanation

To find the mass of an object using a triple beam balance, you should place the object on the pan and adjust the weights until the balance is level. This method directly measures the object's mass accurately.

What is the mass in grams of 3 kilograms?

• 30 grams

• 300 grams

• 3,000 grams

• 300,000 grams

Answer explanation

To convert kilograms to grams, multiply by 1,000. Therefore, 3 kilograms equals 3 x 1,000 = 3,000 grams. The correct answer is 3,000 grams.