Mole (unit)

High school (ages 12+)
Mathematics & Numbers

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/mole-unit

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the historical definition?Previously defined as the number of atoms in 12 grams of carbon-12
2. What is the primary application?Quantifying reactants and products in chemical reactions and expressing solution concentrations (molarity)
3. What is a mole in science?A mole is a unit that tells us how many tiny things, like atoms or molecules, are in a sample. It helps scientists count huge numbers of particles in a simple way.
4. Why is the number of particles in a mole so big?Atoms and molecules are extremely small, so we need a very large number to count them all. The mole uses a huge number so that everyday amounts of matter can be measured easily.

International System of Units (SI): The modern metric system of measurement, established by international agreement.
Avogadro Constant (NA): The number of constituent particles (atoms, molecules, etc.) that are contained in the amount of substance in one mole.
Stoichiometry: The branch of chemistry that deals with the relative quantities of reactants and products in chemical reactions.