Flashcard on the Law of Conservation of Mass

Front

What does a change in oxidation number indicate?

Back

Oxidation or reduction.

Front

What do coefficients in a chemical equation represent?

Back

Mole numbers.

Front

What does the Law of Conservation of Mass state about the total mass in a closed container before and after a reaction?

Back

The total mass remains the same before and after the reaction.

Front

Is the reaction 2 C₃H₈ + 10 O₂ → 6 CO₂ + 8 H₂O balanced?

Back

Yes.

Front

What role does oxygen play in a combustion reaction?

Back

Reactant.

Front

Define the Law of Conservation of Mass.

Back

The principle stating that mass cannot be created or destroyed in a chemical reaction.

Front

What is oxidation in terms of electron transfer?

Back

The loss of electrons by a substance.

Front

What is reduction in terms of electron transfer?

Back

The gain of electrons by a substance.

Front

How do you determine if a chemical equation is balanced?

Back

By ensuring the number of atoms for each element is the same on both sides of the equation.

Front

What is the significance of balancing chemical equations?

Back

It reflects the Law of Conservation of Mass and ensures accurate stoichiometric calculations.