Doc's Law of Conservation of Mass Practice

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 must equal the total mass of the products.

Front

Does the equation 2KClO₃ → 2KCl + 3O₂ follow the Law of Conservation of Mass?

Back

Yes, the mass of the reactants (2KClO₃) equals the mass of the products (2KCl + 3O₂).

Front

If 21g of NaN₃ is used to make 11g of N₂, how much Na will be produced?

Back

10g of Na will be produced, following the Law of Conservation of Mass.

Front

How many elements are in the formula BaBr₂?

Back

There are 2 elements in BaBr₂: Barium (Ba) and Bromine (Br).

Front

Does the reaction (NH₄)Cr₂O₇ → Cr₂O₃ + N₂ + H₂O follow the Law of Conservation of Mass?

Back

No, this reaction does not follow the Law of Conservation of Mass as the mass of the reactants does not equal the mass of the products.

Front

Does the reaction NaSiO₃ + 8HF → H₂SiF₆ + 2NaF + 3H₂O follow the Law of Conservation of Mass?

Back

No, this reaction does not follow the Law of Conservation of Mass.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction.

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations ensures that the Law of Conservation of Mass is obeyed, meaning the number of atoms for each element is the same on both sides of the equation.

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.