Unit 1 Study Guide: Environmental Science & Lab Safety

While working in the lab, Ava accidentally gets an unknown substance on her skin. What is the first thing she should do?

• Rinse the affected area with plenty of water immediately.

• Wait to see if there is a reaction before doing anything.

• Cover the area with a bandage and continue working.

• Ignore it and finish your experiment.

Answer explanation

Rinsing the affected area with plenty of water immediately is crucial to dilute and remove the unknown substance, minimizing potential harm. Waiting or ignoring the issue could lead to serious skin reactions.

Which of the following situations requires you to immediately halt a laboratory procedure?

• Sudden appearance of flames, unusual noises, or rapid bubbling

• Recording all observations as instructed

• Cleaning up your workspace after finishing

• Wearing safety goggles throughout the experiment

Answer explanation

The sudden appearance of flames, unusual noises, or rapid bubbling indicates a potential hazard that requires immediate action to ensure safety. These signs suggest a reaction may be out of control.

Samuel is about to start a chemistry experiment in the lab. Why is it important for him to inspect the glassware before use?

• it may have cracks or defects that could cause accidents.

• it makes the experiment faster.

• it improves the taste of chemicals.

• it changes the color of the solution.

Answer explanation

Inspecting glassware is crucial because it may have cracks or defects that could lead to accidents during the experiment. Ensuring the glassware is safe helps prevent spills, breakage, and potential injuries.

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Emma needs to measure exactly 15 mL of water for her science experiment. Which tool should she use?

• Graduated cylindercylinder

• Beaker

• Test tube

• Petri dish

Answer explanation

Emma should use a graduated cylinder because it is designed for accurately measuring liquid volumes, making it ideal for measuring exactly 15 mL of water.

Emma needs to heat a liquid slowly and evenly for her science experiment. Which equipment combination should she use?

• Beaker and hot plate

• Test tube and Bunsen burner

• Erlenmeyer flask and alcohol lamp

• Graduated cylinder and heat gun

Answer explanation

The beaker and hot plate provide a stable and even heat source, ideal for slowly heating liquids. Other options, like the Bunsen burner or heat gun, can create uneven heating, which is not suitable for Emma's experiment.

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Anika is training for a marathon and runs a distance of 4.5 kilometers. How many meters did Anika run?

• 4500 meters

• 450 meters

• 45 meters

• 4000 meters

Answer explanation

Anika ran 4.5 kilometers. To convert kilometers to meters, multiply by 1000. Thus, 4.5 km x 1000 = 4500 meters. Therefore, the correct answer is 4500 meters.

A recipe needs 1.8 liters of liquid, but your container shows milliliters. How many mL do you need?

• 1800 mL

• 18 mL

• 180 mL

• 18000 mL

Answer explanation

To convert liters to milliliters, multiply by 1000. Therefore, 1.8 liters x 1000 = 1800 mL. The correct answer is 1800 mL.

If you're using a 10x eyepiece and switch to a 10x objective, what's your total magnification?

• 100x

• 10x

• 20x

• 1000x

Answer explanation

To find total magnification, multiply the eyepiece magnification by the objective magnification. Here, 10x (eyepiece) x 10x (objective) = 100x total magnification. Thus, the correct answer is 100x.

Maya is examining a tiny insect under a microscope and wants to see more detail in her specimen. What should she do?

• Increase magnification (switch to a higher power objective).

• Decrease magnification (switch to a lower power objective).

• Turn off the light source.

• Remove the specimen from the stage.

Answer explanation

To see more detail in her specimen, Maya should increase magnification by switching to a higher power objective. This will allow her to observe finer details of the tiny insect.

Abigail is helping her teacher move a microscope in the science lab. Which two parts should she hold to carry it safely?

• Arm and base

• Eyepiece and stage

• Objective lens and mirror

• Stage and diaphragm

Answer explanation

Abigail should hold the arm and base of the microscope to carry it safely. The arm provides support, while the base stabilizes the microscope, preventing damage to its delicate components.