Counting Atoms

Front

What does it mean if there is no subscript following an element symbol?

Back

It means there is only 1 atom of that element.

Front

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

Back

There are 12 Oxygen atoms.

Front

What is the chemical formula C₂H₈O?

Back

It is a compound.

Front

How many atoms of carbon (C) are in C₆H₁₂O₆?

Back

There are 6 carbon atoms.

Front

How many atoms of Oxygen are in Fe(NO₃)₃?

Back

There are 9 Oxygen atoms.

Front

What is a subscript in a chemical formula?

Back

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

Front

What is the total number of atoms in the compound C₃H₈?

Back

There are 11 atoms (3 Carbon, 8 Hydrogen).

Front

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

Back

Add the subscripts of all elements in the formula.

Front

What does the formula H₂O represent?

Back

It represents water, consisting of 2 Hydrogen atoms and 1 Oxygen atom.

Front

What is the significance of parentheses in chemical formulas?

Back

Parentheses indicate that the enclosed group of atoms is a polyatomic ion and can have a subscript applied to it.