Law of Conservation of Mass

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of the reactants equals the total mass of the products.

Front

How many Sulfur atoms are present in the reactants of the equation: 2SO₂ + 2H₂O₂ ----> 2H₂SO₄?

Back

2

Front

What is a Coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a compound or element in a chemical equation to indicate how many molecules or atoms are involved in the reaction.

Front

What does the subscript (2) in the chemical formula 3H₂O represent?

Back

The subscript (2) indicates that there are 2 atoms of Hydrogen in each molecule of water (H₂O).

Front

Which chemical equation is balanced? 4O₂ + 2H₂ + S₂ ------ 2H₂SO₄ or 4H₂ + O₂ ----- 2H₂O₂?

Back

4O₂ + 2H₂ + S₂ ------ 2H₂SO₄ is balanced.

Front

What is a Subscript in a chemical formula?

Back

A subscript is a number written below and to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.

Front

What is the total number of atoms in the reactants of the equation: 2SO₂ + 2H₂O₂?

Back

There are 8 atoms in total: 2 Sulfur, 4 Oxygen (from SO₂), and 4 Oxygen (from H₂O₂) plus 4 Hydrogen.

Front

What is the difference between a Coefficient and a Subscript?

Back

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

Front

In the equation 2H₂ + O₂ -> 2H₂O, how many molecules of water are produced?

Back

2 molecules of water (H₂O) are produced.

Front

What does it mean for a chemical equation to be balanced?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved.