Counting Atoms

Front

What is the formula to determine the number of atoms in a compound?

Back

To find the total number of atoms in a compound, add the subscripts of each element in the formula. If an element has no subscript, it is assumed to be 1.

Front

How many atoms of Nitrogen (N) are in (NH₄)₂CrO₄?

Back

There are 2 Nitrogen atoms in (NH₄)₂CrO₄.

Front

How many Hydrogen atoms are in 4H₂O?

Back

There are 8 Hydrogen atoms in 4H₂O.

Front

How many Sodium (Na) atoms are in 6NaCl?

Back

There are 6 Sodium atoms in 6NaCl.

Front

What is the correct chemical formula for three hydrogen (H), one sulfur (S), and four oxygen (O)?

Back

The correct formula is H₃SO₄.

Front

What does a subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of the element in the molecule.

Front

What is the significance of parentheses in chemical formulas?

Back

Parentheses indicate that the atoms inside are grouped together and the subscript outside applies to all atoms within the parentheses.

Front

How do you calculate the total number of atoms in a compound like C₆H₁₂O₆?

Back

Add the subscripts: 6 (C) + 12 (H) + 6 (O) = 24 total atoms.

Front

What is the difference between a coefficient and a subscript in a chemical formula?

Back

A coefficient indicates the number of molecules, while a subscript indicates the number of atoms of an element in a single molecule.

Front

If a compound has the formula Ca(NO₃)₂, how many oxygen atoms are present?

Back

There are 6 oxygen atoms in Ca(NO₃)₂.