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; it remains constant.

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

What does a coefficient in a chemical equation represent?

Back

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

Front

How do you determine 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 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 a reaction.

Front

In the formula 4NH₃, how many hydrogen (H) atoms are present?

Back

There are 12 hydrogen (H) atoms in 4NH₃ (4 molecules of NH₃, each containing 3 H atoms).

Front

What is the total number of atoms in the molecule 4NH₃?

Back

There are 16 atoms in 4NH₃ (4 nitrogen and 12 hydrogen atoms).

Front

What does it mean if an equation is not balanced?

Back

If an equation is not balanced, it means that the number of atoms of at least one element is different on the reactant and product sides.

Front

What is the role of coefficients in balancing equations?

Back

Coefficients are used to adjust the number of molecules of reactants and products to achieve balance.

Front

Can the subscripts in a chemical formula be changed to balance an equation?

Back

No, subscripts cannot be changed to balance an equation; only coefficients can be adjusted.