Lab safety worksheet with illustrated scenarios and questions on proper lab conduct.
Lab safety worksheet featuring six cartoon panels showing students engaging in various lab activities, with questions about safety practices and proper techniques.
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Show Answer Key & Explanations
Step-by-step solution for: Lab Safety Worksheet Worksheet
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Show Answer Key & Explanations
Step-by-step solution for: Lab Safety Worksheet Worksheet
Here are the answers to the lab safety worksheet questions, based on standard science laboratory rules.
1. List 2 unsafe activities in this picture and explain how they should be changed to make them safe.
* a. The girl has long hair that is hanging down near a flame (Bunsen burner). She should tie her hair back into a ponytail or bun so it does not catch fire.
* b. The boy is pointing a test tube directly at another student while heating it. He should point the open end of the test tube away from himself and others to avoid injury if the liquid boils over or splashes.
2. How should Rick correct his technique?
Rick is smelling the chemical by putting his nose directly over the container. He should use the "wafting" technique: hold the container away from his face and gently wave his hand over the opening to fan the scent toward his nose.
3. Are these students behaving appropriately? If not, what should they be doing differently?
No, they are not behaving safely. They should not be drinking from beakers or flasks, even if they look like cups. Lab glassware often contains residue from chemicals and should never be used for food or drink. They should use a proper water fountain or bring a sealed water bottle kept outside the work area.
4. Compare Evelyn’s technique with Kwan’s technique.
Evelyn is holding the dropper/pipette vertically above the test tube without touching the sides. Kwan is inserting the tip of the dropper inside the test tube and touching the glass walls.
5. Whose technique is the correct one? Why?
Evelyn’s technique is correct. You should never let the dropper touch the inside of the container because it can contaminate the chemical remaining in the dropper bottle. Keeping it above prevents cross-contamination.
6. List two things that should NOT be in the lab.
* a. Food (sandwiches/snacks).
* b. Drinks (soda cans/cups).
*(Note: Horseplay/toys are also acceptable answers).*
7. What unsafe activity is shown in this picture?
The students are running and horseplaying in the laboratory. This is dangerous because they could knock over equipment, spill chemicals, or break glass.
8. What will happen to the students who are doing the unsafe activity?
They will likely cause an accident, such as spilling hazardous chemicals on themselves or others, breaking glassware which creates sharp shards, or starting a fire.
9. Describe Jarvis’ error.
Jarvis is trying to pick up broken glass with his bare hands. He should never touch broken glass directly because he could cut himself.
10. Who in this scenario is performing a correct procedure? What is the correct procedure?
Meredith is performing the correct procedure. When cleaning up broken glass, you should use a broom and dustpan to sweep it up and place it in a designated sharps container or thick cardboard box, not regular trash.
11. What is Penny doing wrong?
Penny is looking into a mirror or compact while working, rather than paying attention to her experiment. In a lab, you must always keep your eyes on your work to prevent accidents.
12. What is wrong with Ernie’s behavior?
Ernie is holding a broken piece of glass and seems to be joking around or showing it off. He should immediately put the glass down carefully (or hand it to the teacher) and report the breakage so it can be cleaned up safely.
13. Why is Lydia’s behavior appropriate? Why is it important in a laboratory setting?
Lydia is wearing safety goggles. This is appropriate because goggles protect her eyes from chemical splashes, flying debris, or fumes. Eye protection is critical because eyes are very sensitive and can be permanently damaged by lab accidents.
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Final Answer:
1a: Tie back long hair to prevent it from catching fire.
1b: Point test tubes away from people to prevent burns from splashing liquids.
2: Use the wafting technique (wave hand over container) instead of sniffing directly.
3: No; do not eat or drink from lab glassware due to chemical contamination risks.
4: Evelyn holds the dropper above the tube; Kwan touches the dropper to the inside of the tube.
5: Evelyn is correct; touching the dropper to the container contaminates the stock solution.
6a: Food.
6b: Drinks/Soda.
7: Running and horseplaying.
8: Spills, broken glass, injuries, or fires.
9: Picking up broken glass with bare hands.
10: Meredith; sweep up glass with a broom and dustpan.
11: Distracted/not watching her experiment.
12: Playing with broken glass instead of reporting it for safe cleanup.
13: Wearing goggles protects eyes from splashes/debris; essential for preventing permanent eye damage.
1. List 2 unsafe activities in this picture and explain how they should be changed to make them safe.
* a. The girl has long hair that is hanging down near a flame (Bunsen burner). She should tie her hair back into a ponytail or bun so it does not catch fire.
* b. The boy is pointing a test tube directly at another student while heating it. He should point the open end of the test tube away from himself and others to avoid injury if the liquid boils over or splashes.
2. How should Rick correct his technique?
Rick is smelling the chemical by putting his nose directly over the container. He should use the "wafting" technique: hold the container away from his face and gently wave his hand over the opening to fan the scent toward his nose.
3. Are these students behaving appropriately? If not, what should they be doing differently?
No, they are not behaving safely. They should not be drinking from beakers or flasks, even if they look like cups. Lab glassware often contains residue from chemicals and should never be used for food or drink. They should use a proper water fountain or bring a sealed water bottle kept outside the work area.
4. Compare Evelyn’s technique with Kwan’s technique.
Evelyn is holding the dropper/pipette vertically above the test tube without touching the sides. Kwan is inserting the tip of the dropper inside the test tube and touching the glass walls.
5. Whose technique is the correct one? Why?
Evelyn’s technique is correct. You should never let the dropper touch the inside of the container because it can contaminate the chemical remaining in the dropper bottle. Keeping it above prevents cross-contamination.
6. List two things that should NOT be in the lab.
* a. Food (sandwiches/snacks).
* b. Drinks (soda cans/cups).
*(Note: Horseplay/toys are also acceptable answers).*
7. What unsafe activity is shown in this picture?
The students are running and horseplaying in the laboratory. This is dangerous because they could knock over equipment, spill chemicals, or break glass.
8. What will happen to the students who are doing the unsafe activity?
They will likely cause an accident, such as spilling hazardous chemicals on themselves or others, breaking glassware which creates sharp shards, or starting a fire.
9. Describe Jarvis’ error.
Jarvis is trying to pick up broken glass with his bare hands. He should never touch broken glass directly because he could cut himself.
10. Who in this scenario is performing a correct procedure? What is the correct procedure?
Meredith is performing the correct procedure. When cleaning up broken glass, you should use a broom and dustpan to sweep it up and place it in a designated sharps container or thick cardboard box, not regular trash.
11. What is Penny doing wrong?
Penny is looking into a mirror or compact while working, rather than paying attention to her experiment. In a lab, you must always keep your eyes on your work to prevent accidents.
12. What is wrong with Ernie’s behavior?
Ernie is holding a broken piece of glass and seems to be joking around or showing it off. He should immediately put the glass down carefully (or hand it to the teacher) and report the breakage so it can be cleaned up safely.
13. Why is Lydia’s behavior appropriate? Why is it important in a laboratory setting?
Lydia is wearing safety goggles. This is appropriate because goggles protect her eyes from chemical splashes, flying debris, or fumes. Eye protection is critical because eyes are very sensitive and can be permanently damaged by lab accidents.
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Final Answer:
1a: Tie back long hair to prevent it from catching fire.
1b: Point test tubes away from people to prevent burns from splashing liquids.
2: Use the wafting technique (wave hand over container) instead of sniffing directly.
3: No; do not eat or drink from lab glassware due to chemical contamination risks.
4: Evelyn holds the dropper above the tube; Kwan touches the dropper to the inside of the tube.
5: Evelyn is correct; touching the dropper to the container contaminates the stock solution.
6a: Food.
6b: Drinks/Soda.
7: Running and horseplaying.
8: Spills, broken glass, injuries, or fires.
9: Picking up broken glass with bare hands.
10: Meredith; sweep up glass with a broom and dustpan.
11: Distracted/not watching her experiment.
12: Playing with broken glass instead of reporting it for safe cleanup.
13: Wearing goggles protects eyes from splashes/debris; essential for preventing permanent eye damage.
Parent Tip: Review the logic above to help your child master the concept of safety in the laboratory worksheet answers.
