Let's analyze each picture and identify the safety violations in a laboratory setting. These are common lab safety mistakes that students should avoid.
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1.
What is wrong?
The student is pouring liquid from a graduated cylinder into a beaker, but
the liquid is splashing, indicating improper handling. Additionally, the student is
not wearing protective goggles or a lab coat, which is essential when working with chemicals.
✔ Safety Violations:
- Not wearing safety goggles.
- Not wearing a lab coat.
- Improper technique—pouring without care, leading to splashing.
- Potential for chemical exposure or contamination.
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2.
What is wrong?
The person is using a
lighted match to ignite a Bunsen burner, but they are
too close to the flame, and the
burner is not properly adjusted. Also, there’s no mention of the gas valve being controlled safely.
✔ Safety Violations:
- Using a match instead of a
sparker (preferred for Bunsen burners).
- Holding the match too close to the burner — could cause burns.
- Risk of igniting gas buildup if not done carefully.
- Should never light the burner with an open flame unless proper precautions are taken.
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✔ Correct Practice: Use a
butane lighter or spark igniter and keep your face away from the burner.
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3.
What is wrong?
The student is
heating a test tube with a Bunsen burner, but
they are holding it with their hand near the mouth, and
no safety goggles are worn. The test tube is also
pointing toward themselves, which is dangerous.
✔ Safety Violations:
- Not wearing
safety goggles.
- Holding the test tube
with fingers near the opening — if contents boil over, it can splash onto hands.
- Test tube is
pointing toward the person instead of away — this can cause injury if contents erupt.
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✔ Correct Practice: Hold the test tube with a
test tube clamp, point it
away from yourself and others, and wear
goggles.
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4.
What is wrong?
A
Bunsen burner is left unattended, with a
flame on, and it's placed
on top of books. This is extremely hazardous because:
- Books are
flammable.
- The flame can
ignite the books.
- No one is watching it.
✔ Safety Violations:
- Leaving a
lit Bunsen burner unattended.
- Placing the burner on
flammable materials (books).
- Lack of supervision during use of open flames.
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✔ Correct Practice: Never leave a flame unattended. Keep burners on
non-flammable surfaces like lab benches.
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5.
What is wrong?
The student is
inhaling or sniffing directly from a test tube, which is
dangerous as it may release toxic fumes.
✔ Safety Violations:
-
Sniffing chemicals directly — this can lead to inhalation of harmful vapors.
- Should never smell chemicals by putting nose close to container.
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✔ Correct Practice: Use the
"wafting" technique — gently wave your hand over the container to direct fumes toward your nose.
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6.
What is wrong?
Students are
talking, laughing, and pushing in the lab. This behavior can lead to
accidents such as dropping equipment or spilling chemicals.
✔ Safety Violations:
-
Inappropriate behavior in the lab — no horseplay.
- Could result in
spills, broken glassware, or injuries.
- Lab work requires focus and seriousness.
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✔ Correct Practice: Stay focused, follow instructions, and maintain a
quiet, orderly environment.
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✔ Summary of Safety Rules Violated:
| Picture | Safety Violation |
|--------|------------------|
| 1 | No goggles, no lab coat, splashing liquid |
| 2 | Using match to light burner, unsafe proximity |
| 3 | No goggles, test tube pointing at self |
| 4 | Unattended flame, burner on flammable books |
| 5 | Sniffing chemicals directly |
| 6 | Horseplay and distractions |
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Final Answer:
These pictures highlight
common lab safety mistakes that could lead to accidents. Always:
- Wear
protective gear (goggles, lab coat).
- Handle chemicals and heat sources
carefully.
- Never leave open flames unattended.
- Avoid
horseplay in the lab.
- Use proper techniques for smelling substances.
By following these rules, you ensure a
safe and productive laboratory environment.
Parent Tip: Review the logic above to help your child master the concept of safety in the laboratory worksheet answers.
