Questions: Identify the most appropriate method to measure the mass of a sample of white powder. Select the single best answer. Place a weighing vessel on the balance and tare the balance. Then add the sample of white powder to the weighing vessel and record the mass. Place the weighing vessel on the balance and add the sample of white powder to the weighing vessel. Tare the balance and then record the mass. Place the sample of white powder on the balance and record the mass. Place a weighing vessel on the balance, add the sample of white powder to the weighing vessel, and then record the mass. Tare the balance. Then place a weighing vessel on the balance. Add the sample of white powder to the weighing vessel. Record the mass.

Solution Steps

We need to identify the most appropriate method to measure the mass of a sample of white powder from the given options.

1. Option 1: Place a weighing vessel on the balance and tare the balance. Then add the sample of white powder to the weighing vessel and record the mass.

   • This method ensures that only the mass of the powder is measured, as the balance is tared to exclude the mass of the vessel.

2. Option 2: Place the weighing vessel on the balance and add the sample of white powder to the weighing vessel. Tare the balance and then record the mass.

   • This method would result in a mass reading of zero because the balance is tared after adding the sample.

3. Option 3: Place the sample of white powder on the balance and record the mass.

   • This method does not use a weighing vessel, which could lead to contamination or loss of the sample.

4. Option 4: Place a weighing vessel on the balance, add the sample of white powder to the weighing vessel, and then record the mass.

   • This method includes the mass of the vessel, which is not ideal for measuring just the sample.

5. Option 5: Tare the balance. Then place a weighing vessel on the balance. Add the sample of white powder to the weighing vessel. Record the mass.

   • This method would result in a mass reading of the vessel plus the sample, as the balance is tared before placing the vessel.

The most appropriate method is the one that ensures only the mass of the sample is measured, which is achieved by taring the balance after placing the weighing vessel.

Final Answer