What three kinds of information does a measurement communicate?

Magnitude (numerical size), unit (comparison standard), and uncertainty (limits of confidence).

What is scientific notation?

A way to represent a number as a value multiplied by a power of ten.

What does SI stand for?

International System of Units, an internationally agreed measurement system based on seven base units.

What does the prefix milli mean?

Milli represents $10^{-3}$, or one-thousandth of a unit.

What is the relationship between cubic decimeters and liters?

One cubic decimeter has the same volume as one liter: $1\ \text{dm}^3 = 1\ \text{L}$.

General chemistryLesson 4 of 6 in the course Essential Ideas

Chemical Measurements: SI Units, Temperature, Volume, and Density

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

For example, in $2.0\ \text{L}$ , the number describes the magnitude and liters identify the unit. Uncertainty is also part of every measurement, even when it is not written explicitly. It reflects the fact that measurements have limited precision.

Units are essential because a number alone may be unclear or unsafe. A prescription that says only “100” does not indicate whether the intended dose is 100 milligrams or 100 grams. The unit changes the meaning dramatically.

All flashcards

What three kinds of information does a measurement communicate?: Magnitude (numerical size), unit (comparison standard), and uncertainty (limits of confidence).
What is scientific notation?: A way to represent a number as a value multiplied by a power of ten.
What does SI stand for?: International System of Units, an internationally agreed measurement system based on seven base units.
What does the prefix milli mean?: Milli represents $10^{-3}$ , or one-thousandth of a unit.
What is the relationship between cubic decimeters and liters?: One cubic decimeter has the same volume as one liter: $1\ \text{dm}^3 = 1\ \text{L}$ .

Quiz questions

A sample is at $25.0\ ^\circ\text{C}$ . What is its temperature in kelvins?Answer: $298.15\ \text{K}$
Water rises from $18.0\ \text{mL}$ to $23.5\ \text{mL}$ when an object is submerged. What is the object's volume?Answer: $5.5\ \text{mL}$
A sample has a mass of $12.0\ \text{g}$ and a volume of $4.0\ \text{cm}^3$ . What is its density?Answer: $3.0\ \text{g/cm}^3$
How is the SI meter defined?Answer: By the distance light travels in vacuum during $1/299{,}792{,}458$ of a second.
Why is temperature classified as an intensive property?Answer: It does not depend on the amount of material in the sample.

Based on Chemistry 2e by Paul Flowers, Klaus Theopold, Richard Langley, William R. Robinson, PhD (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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