Chemistry lesson 4-6 - scientific notation and sig figs

Which of the following is an example of a qualitative measurement?

• 13.5°C

• 25kg

• blue

• 17L

What is the definition of accuracy?

• How close a measurement is to the true or accepted value

• How close multiple measurements are to each other

• A type of observation

• Descriptive measurement

What is the definition of precision?

• How close a measurement is to the true or accepted value

• How close multiple measurements are to each other

• A type of observation

• Descriptive measurement

Which of the following numbers is written in scientific notation?

• 41,000

• 0.0029

• 60,000

What is the result of the calculation 37,000 x 7,000.0 in scientific notation?

• 2.59 x 10⁷

• 7.2 x 10^-7

• 5.6 x 10²

• 308

This bullseye demonstrates...

• High Accuracy & High Precision
• High Accuracy & Low Precision
• Low Accuracy & High Precision
• Low Accuracy & Low Precision

?

• High Accuracy & High Precision
• High Accuracy & Low Precision
• Low Accuracy & High Precision
• Low Accuracy & Low Precision

Measurements: 24.9, 25.2, 25.1, 24.8

True Value: 25.0

These measurements are…

• Accurate, but not precise

• Precise, but not accurate

• Both precise and accurate

• Neither precise nor accurate

Measurements: 2.5, 14.5, 10.1, 45.3

True Value: 25.0

These measurements are…

• Accurate, but not precise

• Precise, but not accurate

• Both precise and accurate

• Neither precise nor accurate

Write 0.000001248 in scientific notation.

• 1.248 x 10^-6

• 1.248 x 10^-5

• 1.248 x 10^-4

• 1.248 x 10^-3