Elements vs Compounds

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), oxygen (O), and carbon (C).

Front

What is a compound?

Back

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

Front

How many different elements are in the compound H2O?

Back

2 (Hydrogen and Oxygen).

Front

Which of the following is an example of an element: H2O, H2, NaCl, or CaCO3?

Back

H2 (Hydrogen gas is an element).

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

Can compounds be broken down into simpler substances?

Back

Yes, compounds can be broken down into their constituent elements through chemical reactions.

Front

What is the smallest unit of an element?

Back

An atom is the smallest unit of an element that retains its properties.

Front

What is the difference between an element and a compound?

Back

An element is a single type of atom, while a compound consists of two or more different types of atoms chemically bonded together.

Front

What is the chemical formula for table salt?

Back

NaCl (sodium chloride is a compound made of sodium and chlorine).

Front

How many different elements are in the compound NaCl?

Back

2 (Sodium and Chlorine).