Conservation of Mass and Chemical Reactions

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 a coefficient in a chemical equation represent?

Back

A coefficient indicates the number of molecules or moles of a substance involved in a chemical reaction.

Front

What does a subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of an element in a molecule.

Front

In the equation 2H₂ + O₂ → 2H₂O, how many hydrogen atoms are present in the products?

Back

There are 4 hydrogen atoms in the products (2 molecules of H₂O, each containing 2 hydrogen atoms).

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

How do you balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients to ensure that 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

Balancing chemical equations is important because it reflects the conservation of mass and ensures that the same amount of each element is present before and after the reaction.

Front

In the equation 2AlCl₃ + 3Na₂CO₃ → Al₂(CO₃)₃ + 6NaCl, how many chlorine atoms are in the reactants?

Back

There are 6 chlorine atoms in the reactants (2 molecules of AlCl₃, each containing 3 chlorine atoms).

Front

What is the difference between an ionic bond and a covalent bond?

Back

An ionic bond is formed when electrons are transferred from one atom to another, while a covalent bond is formed when atoms share electrons.