Flashcard. S8P1f. Conservation of Matter in Reactions

Front

What does the coefficient in a chemical equation represent?

Back

The coefficient indicates the number of molecules or moles of a substance involved in the reaction.

Front

What is the law of conservation of matter?

Back

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

Front

Why is it necessary to balance chemical equations?

Back

Balancing chemical equations ensures that the same number of each type of atom is present on both sides of the equation, reflecting the conservation of matter.

Front

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

Back

A closed system allows energy transfer but prevents the exchange of matter with the surroundings.

Front

If a closed system has reactants with a total mass of 30 grams, what will be the mass of the products?

Back

Exactly 30 grams.

Front

What does a subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of an element in a molecule.

Front

In the equation @@2H_2 + O_2 ightarrow 2H_2O@@, how many oxygen atoms are in the products?

Back

There are 2 oxygen atoms in the products.

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

How can you determine the number of hydrogen atoms in a chemical equation?

Back

Count the hydrogen atoms in the reactants and products by looking at the coefficients and subscripts.

Front

What happens to the total mass of substances in a chemical reaction?

Back

The total mass remains constant; it is conserved throughout the reaction.