Counting Atoms

Front

What is the total number of Hydrogen atoms in 4H₂O?

Back

8

Front

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

Back

6

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

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

Back

2

Front

How many Hydrogen (H) atoms are in 3(NH₄)₂CrO₄?

Back

24

Front

What does the coefficient in a chemical formula represent?

Back

The number of molecules or formula units of the substance.

Front

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

Back

The number of Hydrogen atoms in one molecule of water.

Front

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

Back

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

Front

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

Back

Multiply the subscript outside the parentheses by the subscripts of each element inside.

Front

In the compound Ca(NO₃)₂, how many Oxygen (O) atoms are there?

Back

6 (2 from each NO₃, and there are 2 NO₃ groups).