Law of conservation of mass

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What does the Law of Conservation of Mass state?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

Why is it incorrect to say that gases weigh nothing in a chemical reaction?

Back

Gases have mass, and their weight must be accounted for in a chemical reaction to adhere to the Law of Conservation of Mass.

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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 that indicates the number of molecules or moles of that substance.

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What is a subscript in a chemical formula?

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

Front

If a reaction starts with 20g of reactants, what should the total mass of products be?

Back

The total mass of products should also be 20g, according to the Law of Conservation of Mass.

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How do you calculate the total mass of products in a chemical reaction?

Back

To calculate the total mass of products, sum the masses of all reactants used in the reaction.

Front

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the number of atoms for each element is the same on both sides of the equation, reflecting the Law of Conservation of Mass.

Front

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

Back

The mass of reactants remains constant and is transformed into products, maintaining the total mass.

Front

Can the Law of Conservation of Mass be applied to physical changes?

Back

Yes, the Law of Conservation of Mass applies to both chemical and physical changes, as mass is conserved in both processes.

Front

What is the relationship between reactants and products in a closed system?

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In a closed system, the total mass of reactants equals the total mass of products, as no mass is lost or gained.