Elements, Compounds, and Mixtures

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen (H) and oxygen (O).

Front

Which of the following represents an element? H2O, H2, NaCl, CaCO3

Back

H2

Front

What are atoms?

Back

Atoms are the small particles that make up matter. They are the basic building blocks of elements.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together. Examples include water (H2O) and sodium chloride (NaCl).

Front

Which of the following is not a compound? HCl, Cl, NaCl, CO2

Back

Cl

Front

What is the chemical formula for sulfuric acid?

Back

H2SO4

Front

How many elements are represented in the compound Na2CO3?

Back

3 (Sodium, Carbon, and Oxygen)

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. Examples include air and salad.

Front

What is the difference between a compound and a mixture?

Back

A compound is a substance formed from two or more elements that are chemically bonded, while a mixture is a combination of substances that are not chemically bonded.

Front

What is the smallest unit of a compound?

Back

A molecule is the smallest unit of a compound that retains its chemical properties.