Dimensional Analysis and Unit Conversions

What is a conversion factor?

• A number that changes the value of a measurement.

• A number that has two different units, allowing conversion from one unit to another.

• A mathematical operation used to simplify complex equations.

• A constant used to determine the density of a substance.

How many minutes will it take to drive 405 miles from San Francisco to L.A. if a speed of 72 miles per hour is maintained?

• 5.63 minutes

• 338 minutes

• 405 minutes

• 72 minutes

A beaker contains 9.80 L of water. What is the volume in quarts? (Use 1 L = 1.057 qt)

• 9.27 qt

• 9.80 qt

• 10.36 qt

• 10.4 qt

How many minutes will it take a car to travel 733 miles if the car is moving at a constant speed of 45 mph?

• 16.29 minutes

• 977 minutes

• 45 minutes

• 1026 minutes

Ana needs 40 mg of medicine twice a day. Each medicine tablet contains 20 mg. How many tablets will Ana need for 2 days?

• 5 tablets

• 8 tablets

• 11 tablets

• 16 tablets

What is the primary purpose of using dimensional analysis in chemistry?

• To simplify mathematical calculations.

• To ensure units cancel correctly and the final answer has the desired units.

• To determine the significant figures in a measurement.

• To convert between different temperature scales.