Law of conservation of mass

Front

What is the Law of Conservation of Mass?

Back

Mass is never created or destroyed in a chemical reaction.

Front

What does the coefficient in a chemical equation represent?

Back

The number of moles of a substance involved in the reaction.

Front

Identify the reactants in the reaction: 2Mg + O₂ ---> 2MgO.

Back

Mg (magnesium) and O₂ (oxygen) are the reactants.

Front

What is a coefficient in a chemical equation?

Back

A number placed in front of a compound or element to indicate how many molecules or moles are involved.

Front

If a reaction starts with 20g of reactants, what should be the total mass of the products?

Back

The total mass of the products should also be 20g, according to the Law of Conservation of Mass.

Front

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the number of atoms for each element is the same on both sides of the equation.

Front

What happens to mass during a chemical reaction?

Back

The total mass remains constant; it is conserved.

Front

How do you determine the number of atoms in a molecule like H₂O?

Back

By adding the subscripts: 2 hydrogen atoms and 1 oxygen atom, totaling 3 atoms.

Front

What is the difference between reactants and products in a chemical reaction?

Back

Reactants are the starting substances that undergo a chemical change, while products are the substances formed as a result of the reaction.

Front

What is the role of a chemical equation?

Back

A chemical equation represents a chemical reaction, showing the reactants and products along with their coefficients.