Question

*target # 1- identify the structures and properties of matter by explaining the composition of substances and mixtures pgs 35-40

1. substances that cannot be broken down chemically into other substances are :

a. elements
b. compounds
c. mixtures
d. solutions

Explanation:

To solve this, we recall the definitions:

• Elements are pure substances made of only one type of atom and cannot be broken down chemically into simpler substances.
• Compounds are made of two or more elements chemically combined and can be broken down into elements.
• Mixtures are physical combinations of substances and can be separated physically.
• Solutions are a type of mixture. So the substance that can't be broken down chemically is an element.

Answer:

a. Elements