Measurement 2

Multiple Choice

Which of the following best describes the difference between accuracy and precision in measurement?

• Accuracy is how close a measurement is to the true value, while precision is how close repeated measurements are to each other.

• Accuracy is how close repeated measurements are to each other, while precision is how close a measurement is to the true value.

• Accuracy and precision mean the same thing in measurement.

• Accuracy is only important in chemistry, while precision is only important in physics.

Open Ended

Why is it important to make measurements with both accuracy and precision in scientific experiments?

Open Ended

Explain why the measurements 5.00 g, 5.05 g, 5.10 g, and 5.15 g are considered precise but not accurate in the context of measuring 10 grams of sulfate.

Fill in the Blanks

Fill in the blank: In significant figures, zeroes that come before the first non-zero digit in a number are called

.

Multiple Choice

Which of the following numbers contains 4 significant figures?

• 0.003578

• 0.1200

• 3000

• 203.306

Multiple Choice

Which of the following statements about exact numbers is correct?

• Exact numbers have an indefinite amount of significant figures.

• Exact numbers always have one significant figure.

• Exact numbers are always measured values.

• Exact numbers are never used in calculations.

Open Ended

Explain the difference in how significant figures are handled in multiplication/division versus addition/subtraction, using the examples provided.

Multiple Choice

When multiplying or dividing measurements, what determines the number of significant figures in the answer?

• The number with the most significant figures

• The number with the least significant figures

• The number with the most decimal places

• The number with the least decimal places

Multiple Choice

What is the conversion factor used to convert kilometers to meters in the example provided?

• 100 m

• 10 m

• 1000 m

• 0.001 m

Fill in the Blanks

Fill in the blank: The fraction for unit conversion must be written so that like units

.

Multiple Choice

Which of the following is NOT an objective of measurement analysis as described in the lesson?

• To make measurements with accuracy and precision

• To express and manipulate chemical quantities using scientific conventions

• To memorize chemical formulas without understanding

• To use mathematical procedures in scientific contexts

Open Ended

How can you ensure both accuracy and precision when making scientific measurements?