Law of Conservation of Mass - Task Cards

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 reactants equals the total mass of products.

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 the reactant and product sides.

Front

How can you tell if a chemical equation is unbalanced?

Back

A chemical equation is unbalanced if the number of atoms of any element differs between the reactants and products.

Front

What are reactants in a chemical equation?

Back

Reactants are the starting substances that undergo a chemical change in a reaction.

Front

What are products in a chemical equation?

Back

Products are the substances formed as a result of a chemical reaction.

Front

How many atoms of Carbon are in the product side of the equation C + O2 -> CO2?

Back

There are 1 atom of Carbon in the product side.

Front

If 32 grams of sulfur (S) are needed, what does this imply about the mass of reactants?

Back

According to the Law of Conservation of Mass, the mass of the reactants must equal the mass of the products, so 32 grams of sulfur must be present in the reactants.

Front

Identify the reactants in the equation: 2HgO -> 2Hg + O2.

Back

The reactant in this equation is HgO (mercury(II) oxide).

Front

What is the difference between elements and compounds?

Back

Elements are pure substances that cannot be broken down into simpler substances, while compounds are substances formed from two or more elements chemically bonded together.

Front

How many elements are present in the methane model (CH4)?

Back

The methane model contains 2 elements: Carbon (C) and Hydrogen (H).