Substance (chemistry)

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/substance-chemistry

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 key determinant?Atomic and molecular structure dictates its physical and chemical properties
2. What is the scientific significance?Forms the basis for stoichiometry, thermodynamics, and material science
3. What is a substance in chemistry?A substance is a form of matter that has a uniform and definite chemical composition. It also has characteristic physical and chemical properties that stay the same under specific conditions.
4. How is a substance different from a mixture?A substance has a fixed composition and predictable properties. A mixture can have varying proportions of components, and its properties can change with the surroundings.

Chemical Composition: The elemental makeup of a substance and the ratios in which its atoms are combined.
Physical Properties: Characteristics of a substance that can be observed or measured without changing its chemical identity.
Chemical Properties: Characteristics that describe a substance's ability to undergo a specific chemical change.
Mixture: A material made up of two or more substances that are not chemically bonded and can often be separated by physical means.