Counting Elements and Compounds Flashcard

Front

What is an atom?

Back

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

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 a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Front

How many different elements are in the formula H2COCH2?

Back

3

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together.

Front

Which of the following is a molecule but not a compound? H2, H2O, CO2, Na

Back

H2

Front

Why is H2O considered a compound?

Back

It is made up of two different elements chemically combined.

Front

Which of the following is a compound? O2, H2O, N2, He

Back

H2O

Front

How many chlorine atoms are in MgCl2?

Back

2

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.