Counting Atoms

Front

What is the number of nitrogen (N) atoms in (NH₄)₂CrO₄?

Back

2

Front

How many oxygen (O) atoms are in Al₂(SO₄)₃?

Back

12

Front

What is a subscript in a chemical formula?

Back

A small number below an element symbol that tells the number of atoms of that element.

Front

In the reaction 2H₂ + O₂ → 2H₂O, what are the reactants?

Back

2H₂ + O₂

Front

How many iron (Fe) atoms are in Fe₂O₃?

Back

2

Front

What does a coefficient in a chemical equation represent?

Back

The number of molecules or moles of a substance.

Front

What is the formula for calculating the total number of atoms in a compound?

Back

Add the number of atoms of each element, considering their subscripts.

Front

In the compound Ca(OH)₂, how many oxygen (O) atoms are present?

Back

2

Front

What is the significance of parentheses in chemical formulas?

Back

They indicate that the enclosed atoms are a group that can be multiplied by a subscript.

Front

How many total atoms are in the compound C₆H₁₂O₆?

Back

24 (6 carbon + 12 hydrogen + 6 oxygen).