Counting Atoms

Front

What is a subscript in a chemical formula?

Back

A small number below an element symbol that indicates the number of atoms of that element in a molecule.

Front

How many atoms of Hydrogen are in one molecule of water (H₂O)?

Back

2

Front

What does the formula C₆H₁₂O₆ represent?

Back

A molecule containing 3 different elements: Carbon (C), Hydrogen (H), and Oxygen (O).

Front

How many Oxygen atoms are in the compound Al₂(SO₄)₃?

Back

12

Front

What is the product of the reaction 2H₂ + O₂ -> ?

Back

2H₂O

Front

What does the coefficient in a chemical equation represent?

Back

The number of molecules or moles of a substance involved in the reaction.

Front

In the formula H₂O, what does the '2' represent?

Back

It indicates there are 2 Hydrogen atoms in one molecule of water.

Front

How do you determine the total number of atoms in a compound?

Back

Add the subscripts of all elements in the formula.

Front

What is the significance of the chemical formula C₆H₁₂O₆?

Back

It shows the composition of glucose, which has 6 Carbon, 12 Hydrogen, and 6 Oxygen atoms.

Front

What is the meaning of the term 'element'?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.