Counting Atoms

Front

What is the total number of atoms in one molecule of water (H₂O)?

Back

3 atoms - 2 hydrogen and 1 oxygen.

Front

What is an example of an element?

Back

Cr (Chromium)

Front

How many atoms are in one formula unit of calcium carbonate (CaCO₃)?

Back

4 atoms - 1 calcium, 1 carbon, and 3 oxygen.

Front

(True or False) When we count atoms, we also count lowercase letters?

Back

False.

Front

What does the chemical formula H₂O represent?

Back

Water, consisting of 2 hydrogen atoms and 1 oxygen atom.

Front

How many atoms are in one molecule of carbon dioxide (CO₂)?

Back

3 atoms - 1 carbon and 2 oxygen.

Front

What is the atomic symbol for sodium?

Back

Na.

Front

What is the difference between an element and a compound?

Back

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

Front

How many atoms are in one formula unit of sodium chloride (NaCl)?

Back

2 atoms - 1 sodium and 1 chlorine.

Front

What does the subscript in a chemical formula indicate?

Back

The number of atoms of the element in the molecule.