Lab Safety and Common Lab Apparatus and Equipment

When are you allowed to do experiments in the laboratory?

• When there is no one in the laboratory.

• When the teacher gives permission.

• Anytime.

Answer explanation

The laboratory is among the hazardous places in school. The students may enter and perform experiments only when supervised by an adult.

What is the meaning of PPE?

• Private Protective Equipment
• Personal Prevention Equipment
• Personal Protection Equipment
• Personal Protective Equipment

Ms. Romanova instructed the different clusters to go to their respective working tables in the laboratory. Upon reaching their table, the group of Danver, Jones, and Bruce immediately touched the materials and started the experiment without waiting for the signal from their teacher.

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Answer explanation

Part of the safety protocol involves handling lab materials properly. When lab materials are not used as intended, they may result in breakage or accidents.

What should you do if a chemical substance splashes into your eye?

• Inform the teacher and laboratory assistant immediately.

• Proceed directly to the eyewash station.

• Immediately wipe your eyes with your hankerchief.

• All of the above.

In which direction should you read to know the volume of the liquid in the graduated cylinder?

• Look down from above the graduated cylinder to read the volume.

• Read the volume at eye level with the graduated cylinder.

• Read the volume from below the graduated cylinder.

• All are correct.

How much liquid is there in the graduated cylinder?

• 55 ml

• 54 ml

• 53 ml

• None of the above.

Answer explanation

The meniscus is the curved surface of a liquid in a container, such as a graduated cylinder. To measure accurately, always read the volume at the lowest point of the meniscus at eye level.

Peter carefully submerged the thermometer into the liquid inside the beaker. He waited for the reading to stabilize and then read and recorded the measurement.

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Answer explanation

A laboratory thermometer accurately measures the temperature of substances.

Never shake the thermometer.

Put the thermometer in the liquid, but don't touch the bottom or sides of the container with the bulb.

Wait until the liquid in the thermometer stops moving before reading and recording the measurement.

Which list matches the picture of the set of apparatus shown here?

• beaker

  evaporating dish

  Erlenmeyer flask

  graduated cylinder

• Erlenmeyer flask

  evaporating dish

  graduated cylinder
  beaker

• evaporating dish

  Erlenmeyer flask

  beaker

  graduated cylinder

Mr. Osborn instructed her students to put out the flame from their alcohol lamp. The students should...

• blow out the flame carefully.

• hold the plastic cover with a crucible tong and carefully cover the flame.

• wet the wick by covering it with wet cloth.

• leave it burning until it goes out on its own.

Answer explanation

Use only in a well-ventilated area, under adult supervision.

NEVER leave the alcohol lamp unattended.

Keep combustible materials away from the heating set-up.

When putting out a fire from an alcohol lamp, you need to raise the snuffer again to ensure that the flame is completely extinguished. This helps to prevent the lamp from reigniting due to residual heat or vapor.

Mr. Wayne asked his students to measure 55 ml of water. Which laboratory apparatus would they use to measure accurately?

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Answer explanation

Beakers and Erlenmeyer flasks are mainly used for mixing and heating substances or mixtures. The lines on these containers are only approximate measurements.

The graduated cylinder is used to measure liquids or solutions. The lines on the graduated cylinder are more precise for measuring.