PART A

Rewrite the following measurements into standard uncertainties.

In other words write as Main Number plus/minus Uncertainty

Check your answers by going to "Click For Answer".

1. The scale states that the dog weighs 25.6 kg. The scale's uncertainty is 0.2 kg.

2. A group of scientists time a reaction. Their times range between 0.4956 s and 0.4962 s.

3. A ruler from OUR classroom is used to measure a test tube. Its length is 126 mm.

• Click For Answer #1
• Click For Answer #2
• Click For Answer #3

PART B

Please answer the following questions.

Check your answers by going to "Click For Answer".

1. After using a balance from our classroom, a student stated that the sample weighed 28.2 grams. Is this a valid measurement ? Explain your answer.

2. In our classroom, what is the standard uncertainty of a buret ?

• Click For Answer #1
• Click For Answer #2