Unit Conversions and Significant Digits in Chemistry

What is a conversion factor?

• A ratio that relates two different units of measurement

• A method to solve complex equations

• A mathematical tool for unit analysis

• A fixed number used to change a quantity's unit

Tags

CCSS.4.MD.A.1

Which of the following is a correct representation of a conversion factor?

• 1 minute = 60 seconds

• 1 minute < 60 seconds

• 60 seconds > 1 minute

• 1 minute + 60 seconds

Tags

CCSS.4.MD.A.1

What is the first step in the unit analysis method?

• Multiply by a conversion factor

• Cancel out the original units

• Perform the calculation

• Identify the known and desired units

Tags

CCSS.6.RP.A.3D

In the unit analysis method, what is the purpose of aligning units diagonally?

• To ensure units are correctly canceled out

• To multiply the units together

• To divide the units for a quotient

• To add the units for a total sum

Tags

CCSS.7.EE.B.3

How are significant digits used in unit conversions between different systems?

• They are always considered exact

• They depend on the exactness of the conversion factor

• They are always limited to three significant figures

• They are not important and can be ignored

Tags

CCSS.6.RP.A.3D

Which conversion is considered exact by definition?

• 1 quart to liters

• 1 mile to feet

• 1 inch to 2.54 cm

• 1 pound to grams

Tags

CCSS.6.RP.A.3D

What is the significance of the conversion factor 1 inch equals exactly 2.54 cm?

• It is the only exact conversion between the English and metric systems

• It has three significant figures

• It is an inexact conversion used for rough estimates

• It is used only in scientific contexts

Tags

CCSS.6.RP.A.3D

Why are conversions within the same system (English to English or metric to metric) considered exact?

• Because they are defined by international standards

• Because they do not involve any measurements

• Because they have been measured with precision instruments

• Because they are universally accepted without question

Tags

CCSS.5.NF.B.7A

CCSS.5.NF.B.7C

What is the correct conversion factor to use when converting miles to yards?

• 1 yard = 3 feet

• Both 1 mile = 5280 feet and 1 yard = 3 feet

• 1 mile = 1760 yards

• 1 mile = 5280 feet

Tags

CCSS.4.MD.A.1

How many significant figures should the final answer have in a conversion from gallons to kiloliters?

• It varies depending on the conversion factor used

• Four, as all measurements are exact

• Three, based on the least number of significant figures in the conversion factors

• Two, based on the initial measurement

Tags

CCSS.6.NS.B.3