Structure of Matter

Front

What is a pure substance?

Back

A pure substance is a single substance with a definite composition and properties.

Front

What are the three states of matter?

Back

The three states of matter are Solid, Liquid, and Gas.

Front

What is a compound?

Back

A compound is a new substance with unique chemical and physical properties formed when two or more elements are chemically bonded.

Front

How is matter defined?

Back

Matter is defined as anything that has volume and mass.

Front

What is a molecule?

Back

A molecule is the simplest unit of a chemical compound that can exist, formed when two or more atoms join together chemically.

Front

What distinguishes a mixture from a pure substance?

Back

A mixture contains two or more substances that are not chemically combined, while a pure substance has a uniform and definite composition.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

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

Back

A physical change alters the form or appearance of a substance without changing its composition, while a chemical change results in the formation of new substances.

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.

Front

What is the significance of the atomic number?

Back

The atomic number indicates the number of protons in the nucleus of an atom and determines the element's identity.