Chemical Formulas

Front

What is a chemical formula?

Back

A chemical formula is letters and numbers showing the types and number of atoms that repeat to make up a substance.

Front

Which of the following represents an element? H2O, H2, NaCl, CaCO3

Back

H2

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded, like salad.

Front

What is an atom?

Back

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

Front

What is a molecule?

Back

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

Front

What is a compound?

Back

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

Front

What does H2O represent?

Back

H2O represents water, which is a compound made of two hydrogen atoms and one oxygen atom.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms.

Front

What is the chemical formula for table salt?

Back

The chemical formula for table salt is NaCl.

Front

What is the symbol for Mercury?

Back

The symbol for Mercury is Hg.