Elements and Compunds

Front

What is a compound?

Back

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

Front

Give an example of a compound.

Back

Sodium chloride (NaCl) is an example of a compound.

Front

How many elements are in the compound Na2CO2H2C?

Back

There are 4 different elements: Sodium (Na), Carbon (C), Oxygen (O), and Hydrogen (H).

Front

In the formula MgSO4, how many more atoms of Oxygen are there than Magnesium?

Back

There are 3 more atoms of Oxygen than Magnesium.

Front

What is the chemical formula for a compound containing 1 atom of nickel and 2 atoms of fluorine?

Back

The chemical formula is NiF2.

Front

Describe the composition of a molecule of ammonia (NH3).

Back

A molecule of ammonia consists of 1 atom of nitrogen and 3 atoms of hydrogen.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down into simpler substances, while a compound is made up of two or more elements chemically combined.

Front

What is the significance of subscripts in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a compound.

Front

How do you determine the number of atoms in a molecule from its chemical formula?

Back

Count the number of atoms represented by each element's symbol, including subscripts.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H2O, which consists of 2 hydrogen atoms and 1 oxygen atom.