Conservation of Mass

Front

What are substances present at the start of a chemical reaction?

Back

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

Front

What is the term for the number placed in front of a chemical formula that indicates how many molecules are present?

Back

Coefficient is the number that shows how many molecules of a substance are involved in a reaction.

Front

If 4 grams of sodium combine with chlorine to produce table salt, how many grams of chlorine are needed?

Back

6 grams of chlorine are needed to combine with 4 grams of sodium to produce 10 grams of table salt.

Front

What do we call the substance formed as a result of a chemical reaction?

Back

Product is the substance that is produced in a chemical reaction.

Front

Which of the following describes a chemical reaction: Oxygen interacts with iron to form iron oxide (rust), Ice melts into water, Carbon dioxide freezes to make dry ice, or Rocks split apart due to weathering?

Back

A chemical reaction is described by the interaction of oxygen with iron to form iron oxide (rust).

Front

What is the law that states that mass is neither created nor destroyed in a chemical reaction?

Back

The Law of Conservation of Mass states that the total mass of reactants equals the total mass of products in a chemical reaction.

Front

What is a chemical equation?

Back

A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products.

Front

What is the difference between a reactant and a product?

Back

Reactants are the starting materials in a chemical reaction, while products are the substances formed as a result of the reaction.

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

What is an example of a physical change?

Back

Melting ice into water is an example of a physical change, not a chemical reaction.