Counting Atoms

Front

What is the chemical formula for water?

Back

H₂O

Front

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

Back

3 (1 carbon atom and 2 oxygen atoms)

Front

What does a subscript in a chemical formula indicate?

Back

The number of atoms of the element in the molecule.

Front

How many hydrogen atoms are in the molecule C₆H₁₂O₆ (glucose)?

Back

12

Front

What is the total number of atoms in the molecule Al₂(SO₄)₃?

Back

14 (2 aluminum, 3 sulfur, and 12 oxygen atoms)

Front

How many oxygen atoms are in the compound H₂SO₄ (sulfuric acid)?

Back

4

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 nitrogen atoms are in the molecule H₂C₃O₄N₅?

Back

5

Front

What is the significance of the coefficients in a chemical formula?

Back

Coefficients indicate the number of molecules or moles of a substance.

Front

How many total atoms are in the compound C₁₂H₂₂O₁₁ (sucrose)?

Back

45 (12 carbon, 22 hydrogen, and 11 oxygen atoms)