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 reactants equals the total mass of products.

Front

What are reactants in a chemical equation?

Back

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

Front

What are products in a chemical equation?

Back

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

Front

How can you tell if a chemical equation is balanced?

Back

A chemical equation is balanced when the number of atoms of each element is the same on both sides of the equation.

Front

What does it mean for an equation to be unbalanced?

Back

An unbalanced equation has a different number of atoms of one or more elements on each side, indicating that mass is not conserved.

Front

In the equation N2 + 3H2 → 2NH3, what are the reactants?

Back

The reactants are N2 and H2.

Front

In the equation N2 + 3H2 → 2NH3, what are the products?

Back

The products are NH3.

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How many hydrogen atoms are in 2NH3?

Back

There are 6 hydrogen atoms in 2NH3 (2 x 3 = 6).

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations ensures that the Law of Conservation of Mass is upheld, showing that matter is conserved during the reaction.

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a chemical formula to indicate how many molecules or moles of that substance are involved in the reaction.