Elements and Compounds

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements chemically combine in fixed proportions.

Front

What is a chemical symbol?

Back

A chemical symbol is a one or two-letter notation used to represent an element. The first letter is always capitalized.

Front

How many capital letters does a chemical symbol have?

Back

Only one.

Front

Which of the following is an example of a compound?

Back

HCl (Hydrochloric acid) is a compound.

Front

Which of the following is not a compound?

Back

Cl (Chlorine) is not a compound; it is an element.

Front

What is the difference between an element and a compound?

Back

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

Front

What does it mean for elements to chemically combine?

Back

When elements chemically combine, they form a compound through chemical reactions, resulting in new properties.

Front

Can a compound be broken down into simpler substances?

Back

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

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.