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 the reactants equals the total mass of the products.

Front

If 40 grams of calcium reacts with 71 grams of chlorine, what is the total mass of calcium chloride produced?

Back

111 grams.

Front

How do you calculate the mass of a reactant if the total mass of products is known?

Back

Subtract the mass of the known reactants from the total mass of the products.

Front

What is the total mass of potassium and oxygen if 78 grams of potassium reacts with 16 grams of oxygen to produce potassium oxide?

Back

94 grams.

Front

How many oxygen atoms are present in the equation: 6 CO2 + 6 H2O → C6H12O6 + 6 O2?

Back

18 oxygen atoms.

Front

What is the formula to find the mass of a product in a chemical reaction?

Back

Mass of product = Mass of reactants.

Front

If 14 grams of lithium reacts with sulfur to produce 46 grams of lithium sulfide, how much sulfur is needed?

Back

32 grams.

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 of the equation.

Front

What is the total mass of magnesium and fluorine if 24 grams of magnesium reacts with 38 grams of fluorine?

Back

62 grams.

Front

Define reactants in a chemical reaction.

Back

Reactants are the starting substances that undergo a chemical change in a reaction.