**Flashcard. S8P1f. Conservation of Matter in Reactions

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that in a closed system, the total mass of reactants is equal to the total mass of products in a chemical reaction.

Front

In a closed system, if reactants have a total mass of 25.0 grams, what will be the total mass of the products?

Back

Exactly 25.0 grams.

Front

How many oxygen atoms are present in the compound 5ZnSO4?

Back

There are 20 oxygen atoms.

Front

How does the law of conservation of mass apply to the reaction @@2KClO_3 ightarrow 2KCl + 3O_2@@?

Back

Front

Why is the mass of the products in a chemical reaction equal to the mass of the reactants?

Back

Because atoms are rearranged but not created or destroyed.

Front

What is conserved in a chemical reaction within a closed system?

Back

Mass and the number of atoms.

Front

What happens to atoms during a chemical reaction?

Back

Atoms are rearranged to form new substances, but they are neither created nor destroyed.

Front

What is a closed system in the context of chemical reactions?

Back

A closed system is one where no matter enters or leaves during the reaction.

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 the number of atoms for each element is the same on both sides of the equation.

Front

What is a reactant in a chemical reaction?

Back

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