The Law of Conservation of Mass

Front

What is the Law of Conservation of Mass?

Back

Mass is never created or destroyed in a chemical reaction.

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Back

3

Front

What is a coefficient in a chemical formula?

Back

The number in front of a compound or element that indicates how many molecules or atoms are present.

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Back

12

Front

How many atoms are in the compound 2MgCl2?

Back

6 atoms

Front

What does a subscript in a chemical formula indicate?

Back

The number of atoms of the element in the molecule.

Front

What is the difference between a coefficient and a subscript?

Back

A coefficient indicates the number of molecules, while a subscript indicates the number of atoms in a molecule.

Front

What happens to mass in a chemical reaction according to the Law of Conservation of Mass?

Back

The total mass of the reactants equals the total mass of the products.

Front

If 2H2 + O2 -> 2H2O, what is the total mass of the reactants?

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The total mass of the reactants is equal to the total mass of the products, which is the mass of 2H2O.

Front

What is a chemical formula?

Back

A representation of a substance using symbols for its constituent elements and numbers to indicate the ratio of atoms.