Lavoisier and the Conservation of Mass

What is a chemical reaction?

• A change in which one or more substances are converted into new substances

• A process where substances are destroyed

• A method to create energy

• A way to produce electricity

Who was the French chemist that studied chemical reactions using scientific methods?

• Antoine Lavoisier

• Marie Curie

• Louis Pasteur

• Dmitri Mendeleev

What did Lavoisier discover about the mass of reactants and products in a chemical reaction?

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

• The mass of the products is always greater

• The mass of the reactants is always greater

• Mass is lost during the reaction

What was the result of heating mercury(II) oxide in Lavoisier's experiment?

• It produced mercury metal and an invisible gas

• It turned into gold

• It evaporated completely

• It remained unchanged

What component of air did Lavoisier identify as combining with mercury to form mercury(II) oxide?

• Oxygen gas

• Nitrogen gas

• Carbon dioxide

• Hydrogen gas

What principle did Lavoisier's experiments confirm?

• Law of conservation of mass

• Theory of relativity

• Law of gravity

• Law of thermodynamics

What does the law of conservation of mass state?

• In any chemical reaction, the total starting mass of all reactants is equal to the total final mass of all products

• Mass is created during a chemical reaction

• Mass is destroyed during a chemical reaction

• The mass of products is always less than the mass of reactants