Amount of substance

High school (ages 12+)
Science & Technology

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/amount-of-substance

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 avogadro constant value?The Avogadro constant (NA) is fixed at exactly 6.02214076 × 10^23 mol−1
2. What is the elementary entities?These can be atoms, molecules, ions, electrons, or other specified particles
3. What is the amount of substance in chemistry?It is a way to count how many atoms or molecules are in a sample. It uses the mole as the unit.
4. Why do scientists use the mole instead of just weight or volume?Because weight and volume don't tell us how many tiny particles there are. The mole links the big world we can measure to the tiny particles.

Amount of substance: A fundamental measure in chemistry representing the number of specified elementary entities in a sample.
Mole (mol): The SI base unit for amount of substance, defined by the fixed numerical value of the Avogadro constant.
Avogadro constant (NA): The number of constituent particles, such as atoms or molecules, that are contained in the amount of substance, specified to be 6.02214076 × 10^23.
Elementary entity: An atom, molecule, ion, electron, or other particle specified as being counted for the amount of substance.