Question

choose the best lab equipment to take the following measurements:

1. measure length
2. measure volume of a liquid
3. measure time
4. measure mass
5. measure temperature
6. measure angle

choose the best lab equipment to perform the following tasks safely:

1. hold and heat a test tube
2. handle a hot beaker
3. protect eyes
4. treat minor cuts

procedure b:
review the following numbered spots in the what-not-to-do-lab. tell how the incidents are unsafe.

1.
3.
4.
5.
8.
9.
11.
12.
16.
21.

Explanation:

Part 1: Choose the best lab equipment to take the following measurements:

1. Measure length:

• Equipment: Ruler (or meter stick, measuring tape).
• Explanation: Rulers are standard tools for measuring linear dimensions (length) in a lab.

1. Measure volume of a liquid:

• Equipment: Graduated cylinder (or volumetric flask, beaker for approximate measurements).
• Explanation: Graduated cylinders have marked scales to accurately measure liquid volume.

1. Measure time:

• Equipment: Stopwatch (or timer).
• Explanation: Stopwatches are designed to measure elapsed time precisely.

1. Measure mass:

• Equipment: Balance (e.g., triple - beam balance, electronic scale).
• Explanation: Balances compare or measure the mass of an object against known standards.

1. Measure temperature:

• Equipment: Thermometer (laboratory thermometer, digital thermometer).
• Explanation: Thermometers contain a temperature - sensitive substance (like mercury or alcohol in traditional ones, or a sensor in digital ones) to measure temperature.

1. Measure angle:

• Equipment: Protractor.
• Explanation: Protractors have a scale marked in degrees to measure angles between two lines.

Part 2: Choose the best lab equipment to perform the following tasks safely:

1. Hold and heat a test tube:

• Equipment: Test - tube holder.
• Explanation: Test - tube holders provide a safe grip on test tubes, especially when they are hot or being heated, preventing burns.

1. Handle a hot beaker:

• Equipment: Beaker tongs (or heat - resistant gloves).
• Explanation: Beaker tongs allow you to grasp a hot beaker without direct contact, avoiding thermal burns.

1. Protect eyes:

• Equipment: Safety goggles.
• Explanation: Safety goggles shield the eyes from chemical splashes, flying debris, or other hazards in the lab.

1. Treat minor cuts:

• Equipment: First - aid kit (specifically, antiseptic wipes and bandages).
• Explanation: A first - aid kit contains supplies to clean and cover minor cuts to prevent infection.

Part 3: Procedure B (Note: Since the “What - Not - To - Do - Lab” incidents are not provided, here is a general approach. For a specific incident, e.g., if an incident shows a student drinking from a beaker in the lab):

• Example Incident (hypothetical): “Student drinks from a beaker labeled ‘chemical waste’.”
• Unsafe Reason: Lab chemicals are toxic, corrosive, or otherwise hazardous. Ingesting them can cause poisoning, internal burns, or long - term health problems.

If you can provide the details of the numbered spots (1, 3, 4, 5, 8, 9, 11, 12, 16, 21) in the “What - Not - To - Do - Lab”, I can give more specific unsafe - reason analyses.

Answer:

Part 1: Choose the best lab equipment to take the following measurements:

1. Measure length:

• Equipment: Ruler (or meter stick, measuring tape).
• Explanation: Rulers are standard tools for measuring linear dimensions (length) in a lab.

1. Measure volume of a liquid:

• Equipment: Graduated cylinder (or volumetric flask, beaker for approximate measurements).
• Explanation: Graduated cylinders have marked scales to accurately measure liquid volume.

1. Measure time:

• Equipment: Stopwatch (or timer).
• Explanation: Stopwatches are designed to measure elapsed time precisely.

1. Measure mass:

• Equipment: Balance (e.g., triple - beam balance, electronic scale).
• Explanation: Balances compare or measure the mass of an object against known standards.

1. Measure temperature:

• Equipment: Thermometer (laboratory thermometer, digital thermometer).
• Explanation: Thermometers contain a temperature - sensitive substance (like mercury or alcohol in traditional ones, or a sensor in digital ones) to measure temperature.

1. Measure angle:

• Equipment: Protractor.
• Explanation: Protractors have a scale marked in degrees to measure angles between two lines.

Part 2: Choose the best lab equipment to perform the following tasks safely:

1. Hold and heat a test tube:

• Equipment: Test - tube holder.
• Explanation: Test - tube holders provide a safe grip on test tubes, especially when they are hot or being heated, preventing burns.

1. Handle a hot beaker:

• Equipment: Beaker tongs (or heat - resistant gloves).
• Explanation: Beaker tongs allow you to grasp a hot beaker without direct contact, avoiding thermal burns.

1. Protect eyes:

• Equipment: Safety goggles.
• Explanation: Safety goggles shield the eyes from chemical splashes, flying debris, or other hazards in the lab.

1. Treat minor cuts:

• Equipment: First - aid kit (specifically, antiseptic wipes and bandages).
• Explanation: A first - aid kit contains supplies to clean and cover minor cuts to prevent infection.

Part 3: Procedure B (Note: Since the “What - Not - To - Do - Lab” incidents are not provided, here is a general approach. For a specific incident, e.g., if an incident shows a student drinking from a beaker in the lab):

• Example Incident (hypothetical): “Student drinks from a beaker labeled ‘chemical waste’.”
• Unsafe Reason: Lab chemicals are toxic, corrosive, or otherwise hazardous. Ingesting them can cause poisoning, internal burns, or long - term health problems.

If you can provide the details of the numbered spots (1, 3, 4, 5, 8, 9, 11, 12, 16, 21) in the “What - Not - To - Do - Lab”, I can give more specific unsafe - reason analyses.