Law of conservation of mass

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that in a closed system, the mass of the reactants must equal the mass of the products in a chemical reaction.

Front

What does it mean for a chemical reaction to be balanced?

Back

A chemical reaction is balanced when both sides have the same number of atoms for each element involved.

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a compound or element in a chemical equation to indicate how many molecules or atoms are involved.

Front

What is mass?

Back

Mass is a measure of the amount of matter in an object, typically measured in grams or kilograms.

Front

What happens to the mass of reactants during a chemical reaction?

Back

The total mass of the reactants remains the same before and after the reaction, according to the Law of Conservation of Mass.

Front

How do you determine the number of atoms in a chemical formula?

Back

The number of atoms of each element in a chemical formula is indicated by the subscripts following the element symbols.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.

Front

If 100 g of CaCO3 is heated, what can be said about the mass of the products?

Back

The sum of the products’ masses equals the mass of the CaCO3, which is 100 g.

Front

How many oxygen atoms are in the chemical formula C6H12O6?

Back

There are 6 oxygen atoms in the chemical formula C6H12O6.

Front

What is a subscript in a chemical formula?

Back

A subscript is a number written below and to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.