Question

data table
a. length measurements
length of a 13 x 100 mm test tube
metric ruler a ______ cm
metric ruler b ______ cm
diameter of a watchglass
metric ruler a ______ cm
metric ruler b ______ cm
diameter of an evaporating dish
metric ruler a ______ cm
metric ruler b ______ cm
b. mass measurements
mass of an evaporating dish
decigram balance ______ g
centigram balance ______ g
milligram balance ______ g
mass of a crucible and cover
decigram balance ______ g
centigram balance ______ g
milligram balance ______ g
mass of a 125-ml erlenmeyer flask
decigram balance ______ g
centigram balance ______ g
milligram balance ______ g

Explanation:

This is a data table for recording measurements (length and mass) using different instruments. To fill it, you would perform the following steps for each measurement:

For Length Measurements (Section A):

1. Select the object (e.g., 13×100 mm test tube, watchglass, evaporating dish).
2. Use Metric Ruler A to measure the length/diameter. Read the scale, ensuring proper alignment (e.g., start at 0 cm). Record the value in cm.
3. Use Metric Ruler B to repeat the measurement. Note any differences due to ruler precision or user technique.

For Mass Measurements (Section B):

1. Select the object (e.g., evaporating dish, crucible and cover, 125-mL Erlenmeyer flask).
2. Use the decigram balance to measure the mass. Place the object on the balance, read the scale, and record the value in grams (g).
3. Use the centigram balance to repeat the measurement. Centigram balances have higher precision (0.01 g vs. 0.1 g for decigram), so the value may be more detailed.
4. Use the milligram balance (highest precision, 0.001 g) to measure again. Record the mass.

Example (Hypothetical Values for Illustration):

• Length of 13×100 mm test tube:
• Metric Ruler A: $10.0$ cm (since 100 mm = 10 cm)
• Metric Ruler B: $10.0$ cm (if both rulers are accurate)

• Mass of evaporating dish:
• Decigram balance: $50.0$ g
• Centigram balance: $50.00$ g
• Milligram balance: $50.000$ g

To complete the table, you must physically measure the objects with the provided instruments and record the observed values. The table is designed to compare measurements across different tools (rulers for length, balances for mass) to analyze precision and accuracy.

Answer:

This is a data table for recording measurements (length and mass) using different instruments. To fill it, you would perform the following steps for each measurement:

For Length Measurements (Section A):

1. Select the object (e.g., 13×100 mm test tube, watchglass, evaporating dish).
2. Use Metric Ruler A to measure the length/diameter. Read the scale, ensuring proper alignment (e.g., start at 0 cm). Record the value in cm.
3. Use Metric Ruler B to repeat the measurement. Note any differences due to ruler precision or user technique.

For Mass Measurements (Section B):

1. Select the object (e.g., evaporating dish, crucible and cover, 125-mL Erlenmeyer flask).
2. Use the decigram balance to measure the mass. Place the object on the balance, read the scale, and record the value in grams (g).
3. Use the centigram balance to repeat the measurement. Centigram balances have higher precision (0.01 g vs. 0.1 g for decigram), so the value may be more detailed.
4. Use the milligram balance (highest precision, 0.001 g) to measure again. Record the mass.

Example (Hypothetical Values for Illustration):

• Length of 13×100 mm test tube:
• Metric Ruler A: $10.0$ cm (since 100 mm = 10 cm)
• Metric Ruler B: $10.0$ cm (if both rulers are accurate)

• Mass of evaporating dish:
• Decigram balance: $50.0$ g
• Centigram balance: $50.00$ g
• Milligram balance: $50.000$ g

To complete the table, you must physically measure the objects with the provided instruments and record the observed values. The table is designed to compare measurements across different tools (rulers for length, balances for mass) to analyze precision and accuracy.