chemistry lab and classroom worksheet
answer the following questions on this sheet.
1. describe in point form at least four safety rules that are absolutely necessary before you start an experiment or lab investigation.
2. what steps should you take if you wear contacts (before starting an experiment)?
3. what types of items should you never bring into a lab?
4. how should you hold a stock bottle of chemicals? why?
5. what two senses must you always avoid using when working with chemicals? why?
6. describe the proper technique for smelling chemicals.
7. what procedure should you follow if any chemicals come into contact with your eyes?

Question

Accepted Answer

### Question 1
# Brief Explanations:
1. **Read Instructions**: Understand the experiment's steps, hazards, and safety protocols from the lab manual or instructor's guidance.
2. **Wear PPE**: Put on appropriate personal protective equipment (PPE) like lab coats, safety goggles, gloves, and closed - toe shoes to protect against chemical spills, splashes, and physical hazards.
3. **Inspect Equipment**: Check all lab equipment (e.g., glassware, burners, pipettes) for cracks, damage, or malfunctions. Damaged equipment can cause accidents or inaccurate results.
4. **Prepare Workspace**: Clear the lab bench of unnecessary items, organize materials, and ensure there is proper ventilation (e.g., turn on fume hoods if needed) to minimize exposure to harmful fumes.

# Answer:
- Read the experiment’s instructions thoroughly.
- Wear proper PPE (lab coat, goggles, gloves, closed - toe shoes).
- Inspect all lab equipment for damage.
- Organize and clear the lab workspace.

### Question 2
# Brief Explanations:
Contact lenses can trap chemicals against the eyes, increasing the risk of injury. So, before starting an experiment, remove contact lenses and store them safely. Then, wear appropriate eye protection like safety goggles to shield the eyes from chemical splashes, fumes, or debris.

# Answer:
Remove contact lenses and store them safely. Then wear safety goggles.

### Question 3
# Brief Explanations:
Items that pose a safety risk or can contaminate the lab should be excluded. Food and drinks can be contaminated by chemicals or contaminate experiments. Cosmetics (like lip balm, nail polish) can react with chemicals or introduce contaminants. Electronic devices (e.g., smartphones) can be damaged by chemicals or cause distractions that lead to accidents. Jewelry (especially dangling pieces) can get caught in equipment or come into contact with chemicals, causing injury or contamination.

# Answer:
Items like food, drinks, cosmetics, electronic devices (e.g., phones), and dangling jewelry should never be brought into a lab.

### Question 4
# Brief Explanations:
When holding a stock bottle of chemicals, hold it with the label facing up (towards you). This way, if any chemical spills or drips, the label (which contains important information like the chemical’s name, hazards, and handling instructions) remains legible and protected. Also, hold the bottle firmly to prevent accidental dropping or spilling.

# Answer:
Hold the stock bottle with the label facing up (towards you) and hold it firmly. This protects the label from spills and ensures a secure grip to prevent accidents.

### Question 5
# Brief Explanations:
- **Sense of Taste**: Chemicals are often toxic, corrosive, or otherwise harmful. Tasting them can lead to poisoning, burns, or other serious health issues.
- **Sense of Smell (Direct Inhalation)**: Inhaling chemicals directly (by putting your nose over the container) can expose you to high concentrations of harmful fumes, which can irritate the respiratory system, cause poisoning, or long - term health problems.

# Answer:
The sense of taste and direct use of the sense of smell (direct inhalation) must be avoided. Tasting chemicals can cause poisoning/burns, and direct inhalation of chemical fumes can harm the respiratory system.

### Question 6
# Brief Explanations:
To smell chemicals safely, use the “wafting” technique. Hold the container a safe distance from your face. Then, use your hand to gently wave the fumes towards your nose (without putting your nose over the container). This dilutes the concentration of the fumes you inhale, reducing the risk of inhaling a harmful amount of the chemical.

# Answer:
Use the wafting technique: hold the container away from your face and wave the fumes towards your nose with your hand.

### Question 7
# Brief Explanations:
If chemicals come into contact with your eyes, immediately go to the eye - wash station. Hold your eyelids open and flush your eyes with plenty of running water for at least 15 minutes. This helps to dilute and remove the chemical from the eyes, minimizing damage. After flushing, seek medical attention as soon as possible.

# Answer:
Immediately go to the eye - wash station, hold eyelids open, and flush eyes with running water for at least 15 minutes. Then seek medical help.

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