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

If 200 grams of ice melts in 900 grams of water, what is the total mass of water after melting?

Back

1,100 grams.

Front

What happens to the mass of reactants in a chemical reaction?

Back

The mass of reactants remains the same before and after the reaction.

Front

In a chemical reaction, if 24 g of magnesium reacts with 38 g of fluorine, what is the mass of magnesium fluoride produced?

Back

62 grams.

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

In the equation 3H2O, what does the coefficient '3' represent?

Back

The coefficient '3' indicates that there are three molecules of water.

Front

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

Back

The total mass of products should also be 20g.

Front

In the reaction A + B -> C, if A has 5g and C has 9g, how much does B weigh?

Back

B weighs 4g.

Front

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the Law of Conservation of Mass is upheld, meaning the number of atoms for each element is the same on both sides.