Counting Atoms and Elements

Front

What is the chemical formula for water?

Back

H₂O

Front

How many atoms are in one molecule of H₂O?

Back

3 (2 Hydrogen atoms and 1 Oxygen atom)

Front

What does a subscript in a chemical formula indicate?

Back

The number of atoms of the element in the molecule.

Front

If a chemical symbol has no subscript, how many atoms of that element are present?

Back

1

Front

What is the chemical formula for ethane?

Back

C₂H₆

Front

Which element is represented by the symbol 'O'?

Back

Oxygen

Front

In the compound AgNO₃, which element has the greatest number of atoms?

Back

Oxygen (3 atoms)

Front

What is the total number of atoms in the formula H₂O₂?

Back

4 (2 Hydrogen atoms and 2 Oxygen atoms)

Front

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

Back

They indicate the number of molecules or moles of the compound.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.