Review- Law of Conservation of Matter

Front

What does the Law of Conservation of Matter state?

Back

The Law of Conservation of Matter states that matter cannot be created or destroyed in a chemical reaction; the mass of the reactants equals the mass of the products.

Front

In a chemical reaction, if the mass of the products is 20 grams, what is the mass of the reactants?

Back

20 grams.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.

Front

If a reaction has reactants A and B, what are the products if the reaction is A + B -> C?

Back

The product is C.

Front

If the mass of reactant AB is 12 grams and product B is 5 grams, how much should product A weigh?

Back

7 grams.

Front

What is the relationship between reactants and products in a closed system?

Back

In a closed system, the total mass of reactants equals the total mass of products.

Front

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

Back

The mass of reactants remains the same; it is transformed into products.

Front

If 10 grams of reactants produce 10 grams of products, what does this demonstrate?

Back

This demonstrates the Law of Conservation of Matter.

Front

What is an example of a chemical reaction that illustrates the Law of Conservation of Matter?

Back

The reaction of hydrogen and oxygen to form water: 2H2 + O2 -> 2H2O.

Front

What is the formula to calculate the mass of products if the mass of reactants is known?

Back

Mass of products = Mass of reactants.