think safety first worksheet
directions: work with a partner and take turns identifying what is the potential accident
and \what is the prevention action that should be taken?\
use this worksheet to record each spersons response during the hink safety first\ game

1. you are using a microscope to
view a wet mount of skin cells.
accident: _____________________
_____________________________
prevention: ____________________
_____________________________

2. you wash your hands, and dont
dry them. you pick up a beaker to
carry it to your lab station.
accident: _____________________
_____________________________
prevention: ____________________
_____________________________

3. your lab station is messy, covered
with papers and supplies. you need
to heat water on a bunsen burner.
accident: _____________________
_____________________________
prevention: ____________________
_____________________________

4. the class before you left a beaker
sitting on a hot plate at you lab
station. the hot plate is off.
accident: _____________________
_____________________________
prevention: ____________________
_____________________________

5. while measuring chemicals for
a solution, you accidentally spill a
large amount.
accident: _____________________
_____________________________
prevention: ____________________
_____________________________

6. you need to measure the mass of a
large, heavy rock. you decide to use
a spring scale.
accident: _____________________
_____________________________
prevention: ____________________
_____________________________

7. you are using a bunsen burner
to heat a chemical. you need your
notebook, which is on the other side
of the flame.
accident: _____________________
_____________________________
prevention: ____________________
_____________________________

8. you discover that the test tube you
are using has a crack in it.
accident: _____________________
_____________________________
prevention: ____________________
_____________________________

Question

think safety first worksheet
directions: work with a partner and take turns identifying what is the potential accident
and \what is the prevention action that should be taken?\
use this worksheet to record each spersons response during the 	hink safety first\ game

1. you are using a microscope to
view a wet mount of skin cells.
accident: _____________________
_____________________________
prevention: ____________________
_____________________________

2. you wash your hands, and dont
dry them. you pick up a beaker to
carry it to your lab station.
accident: _____________________
_____________________________
prevention: ____________________
_____________________________

3. your lab station is messy, covered
with papers and supplies. you need
to heat water on a bunsen burner.
accident: _____________________
_____________________________
prevention: ____________________
_____________________________

4. the class before you left a beaker
sitting on a hot plate at you lab
station. the hot plate is off.
accident: _____________________
_____________________________
prevention: ____________________
_____________________________

5. while measuring chemicals for
a solution, you accidentally spill a
large amount.
accident: _____________________
_____________________________
prevention: ____________________
_____________________________

6. you need to measure the mass of a
large, heavy rock. you decide to use
a spring scale.
accident: _____________________
_____________________________
prevention: ____________________
_____________________________

7. you are using a bunsen burner
to heat a chemical. you need your
notebook, which is on the other side
of the flame.
accident: _____________________
_____________________________
prevention: ____________________
_____________________________

8. you discover that the test tube you
are using has a crack in it.
accident: _____________________
_____________________________
prevention: ____________________
_____________________________

Accepted Answer

### 1.
# Brief Explanations:
- **Accident**: When using a microscope with a wet mount, the slide might slip or the lens could get damaged if not handled carefully, or the wet mount could cause the slide to be unstable, leading to breakage or improper viewing. Also, if the microscope is not adjusted properly, eye strain or incorrect observation could occur, but more likely, the wet mount might cause the slide to move, or the user could accidentally touch the lens with fingers (contaminating it) or drop the slide. A common accident here is the slide slipping and breaking, or the lens getting wet/damaged from the wet mount. Another possibility is that the user might press too hard on the focus knob, breaking the slide.
- **Prevention**: Handle the slide carefully, ensure the stage clips are holding the slide securely. Keep hands away from the lens (use lens paper if needed). Adjust the microscope slowly and gently. Also, make sure the wet mount is properly prepared so it doesn't leak onto the microscope.

# Answer:
- **Accident**: The slide with the wet mount of skin cells could slip from the stage, break, or the lens could get contaminated/damaged by the wet mount.
- **Prevention**: Secure the slide with stage clips, handle the slide gently, and keep the lens clean (use lens paper if contact with moisture is possible).

### 2.
# Brief Explanations:
- **Accident**: Wet hands are slippery, so when picking up a beaker, there's a high chance of dropping it. Dropping a beaker (especially if it contains chemicals or is made of glass) can cause it to break, leading to spills, cuts from broken glass, or exposure to hazardous materials if the beaker had chemicals.
- **Prevention**: Dry hands thoroughly before handling glassware or lab equipment. Use a towel or paper towel to dry hands completely to ensure a firm grip on the beaker.

# Answer:
- **Accident**: Dropping the beaker due to slippery wet hands, which could result in broken glass, chemical spills (if the beaker contained substances), or cuts.
- **Prevention**: Dry hands completely with a towel or paper towel before picking up the beaker.

### 3.
# Brief Explanations:
- **Accident**: A messy lab station with papers and supplies near a Bunsen burner is a fire hazard. The papers or supplies could catch fire from the burner's flame. Also, clutter can cause the user to trip or knock over equipment, leading to spills or breakage. Heating water on a Bunsen burner in a messy area also increases the risk of accidentally knocking over the burner or the beaker of water, causing burns or water spills (which could damage equipment or cause slipping).
- **Prevention**: Clean and organize the lab station before starting any experiment. Remove all unnecessary papers and supplies from the area around the Bunsen burner. Ensure there is a clear, unobstructed workspace.

# Answer:
- **Accident**: Fire from the Bunsen burner igniting papers/supplies, or tripping over clutter, or knocking over the burner/beaker (causing burns or water spills).
- **Prevention**: Clean and organize the lab station, removing all non - essential items from the area around the Bunsen burner.

### 4.
# Brief Explanations:
- **Accident**: A beaker left on a hot plate (even if the hot plate is off) can still be very hot (if it was used previously and hasn't cooled down). Touching the beaker without realizing it's hot can cause burns. Also, if the beaker contains a chemical, it might have reacted or evaporated while on the hot plate, and moving it without proper precautions could lead to spills or exposure to harmful substances.
- **Prevention**: Always check the temperature of lab equipment (like hot plates) and glassware before handling. Use heat - resistant gloves or tongs to move the beaker if it might be hot. Wait for the beaker and hot plate to cool down completely before moving the beaker.

# Answer:
- **Accident**: Burning hands from touching the hot beaker (even if the hot plate is off, the beaker could still be hot from previous use).
- **Prevention**: Use heat - resistant gloves or tongs to move the beaker, or wait for the beaker and hot plate to cool down before handling.

### 5.
# Brief Explanations:
- **Accident**: Spilling a large amount of chemicals can lead to several issues. If the chemical is corrosive, it can damage surfaces, equipment, or cause burns if it comes into contact with skin. If it's toxic, it can contaminate the air or the lab environment, leading to inhalation hazards or exposure. It can also mix with other chemicals accidentally, causing unwanted reactions.
- **Prevention**: When measuring chemicals, work slowly and carefully. Use appropriate safety equipment like gloves and goggles. Have a spill kit nearby and know how to use it. If a spill occurs, follow the lab's spill - response procedures (e.g., neutralize acids/bases, clean up with absorbent materials). Also, measure chemicals over a tray or a spill - proof surface to contain any potential spills.

# Answer:
- **Accident**: Chemical burns, contamination of the lab environment, or unwanted chemical reactions from the spilled chemicals.
- **Prevention**: Measure chemicals carefully, use safety equipment (gloves, goggles), work over a spill - proof surface, and be prepared to use a spill kit if needed.

### 6.
# Brief Explanations:
- **Accident**: A spring scale is designed to measure relatively light objects. A large, heavy rock will likely exceed the spring scale's capacity. This can cause the spring scale to break, the rock to fall (causing damage to the scale, the lab bench, or injury if it hits someone), or inaccurate measurements (but the main hazard is the scale breaking and the rock falling).
- **Prevention**: Use an appropriate measuring device for heavy objects, such as a beam balance or a digital scale with a high weight capacity. Check the weight limit of the measuring device before use.

# Answer:
- **Accident**: The spring scale could break under the weight of the large, heavy rock, causing the rock to fall (potentially damaging equipment or causing injury).
- **Prevention**: Use a scale (like a beam balance or high - capacity digital scale) that is appropriate for measuring the weight of the large, heavy rock.

### 7.
# Brief Explanations:
- **Accident**: Reaching across a Bunsen burner flame to get a notebook is extremely dangerous. The flame can burn the user's arm or clothing. Also, the movement across the flame can cause air currents that might disrupt the flame, leading to uneven heating or the flame spreading (e.g., if there are flammable materials nearby).
- **Prevention**: Turn off the Bunsen burner (or move it to a safe location) before reaching for the notebook. Alternatively, ask a partner to pass the notebook, or use a tool to retrieve it without crossing the flame.

# Answer:
- **Accident**: Burning the arm or clothing from the Bunsen burner flame while reaching for the notebook.
- **Prevention**: Turn off the Bunsen burner or move it, and then retrieve the notebook, or ask for assistance to get the notebook without crossing the flame.

### 8.
# Brief Explanations:
- **Accident**: A cracked test tube is a safety hazard. When using it (e.g., heating it, adding chemicals), the crack can cause the test tube to break, leading to spills of chemicals (which could be corrosive, toxic, etc.), broken glass, and potential injury from the broken glass or chemical exposure.
- **Prevention**: Inspect test tubes before use. If a test tube is cracked, discard it properly (in a broken glass container) and use a new, undamaged test tube.

# Answer:
- **Accident**: The cracked test tube could break during use, causing chemical spills, broken glass, and injury.
- **Prevention**: Inspect test tubes before use; discard cracked test tubes and use a new one.

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