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 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 in the reaction.

Front

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

Back

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

Front

Identify the reactants in the reaction: 2Mg + O2 → 2MgO.

Back

The reactants are Mg (magnesium) and O2 (oxygen).

Front

What evidence supports the Law of Conservation of Mass in a reaction?

Back

The total mass of the reactants before the reaction equals the total mass of the products after the reaction.

Front

How do you balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients in front of the compounds to ensure the same number of each type of atom on both sides.

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What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.

Front

What is the significance of subscripts in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a molecule.

Front

What happens to atoms during a chemical reaction?

Back

Atoms are rearranged to form new substances, but they are neither created nor destroyed.