EI3 Flashcard

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 must equal the total mass of products in a chemical reaction.

Front

What happens to the mass of products if gases are released during a reaction?

Back

The total mass of the products will be less than the total mass of the reactants because the gases escape into the air.

Front

What does a subscript in a chemical formula indicate?

Back

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

Front

What does a coefficient in a chemical equation represent?

Back

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

Front

How do you calculate the total number of atoms in a compound?

Back

To calculate the total number of atoms, multiply the number of atoms of each element by its coefficient and sum them up.

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, satisfying the Law of Conservation of Mass.

Front

What is a precipitate in a chemical reaction?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the same number of atoms of each element is present before and after the reaction, adhering to the Law of Conservation of Mass.

Front

How many atoms are in the compound 2MgCl2?

Back

There are 6 atoms in the compound 2MgCl2 (2 magnesium atoms and 4 chlorine atoms).