Classification of Matter and Properties

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together. Example: Water (H2O) is a compound made of hydrogen and oxygen.

Front

What is the smallest unit of a molecular compound?

Back

The smallest unit of a molecular compound that retains its chemical properties is a molecule.

Front

What are the characteristics of a solid?

Back

Solids have a definite shape, definite volume, and particles that are closely packed together.

Front

What is the formula for density?

Back

Density is calculated using the formula: Density = Mass / Volume.

Front

What are the characteristics of a gas?

Back

Gases have no definite shape, no definite volume, and their particles move freely and are far apart.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Example: Oxygen (O) is an element.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. Example: Saltwater is a mixture of salt and water.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition (e.g., melting ice). A chemical change results in the formation of new substances (e.g., rusting iron).

Front

What is an ion?

Back

An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a net charge. Example: Na+ is a sodium ion.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it is conserved.