What Is The Law of Conservation of Mass

The video tutorial explains the law of conservation of mass, its historical development, and its significance in modern chemistry. It covers the transition from the phlogiston theory to Lavoisier's discovery that matter is not destroyed in chemical reactions. The tutorial also discusses the development of chemical laws, such as the law of definite proportions, and the creation of the periodic table. It provides practical examples of balancing chemical equations, emphasizing the importance of accounting for all atoms in reactions to conserve mass.

Who was the scientist responsible for establishing the law of conservation of mass in 1789?

• Joseph Priestley

• Antoine Lavoisier

• John Dalton

• Dmitri Mendeleev

What significant contribution did Mendeleev make to chemistry in the 19th century?

• He discovered the electron.

• He invented the Bunsen burner.

• He developed the periodic table.

• He formulated the law of definite proportions.

Why is it important to balance chemical equations?

• To make the reaction faster.

• To comply with the law of conservation of mass.

• To reduce the cost of the reaction.

• To ensure the reaction is safe.

In a chemical reaction involving natural gas, what must be done to balance the hydrogen atoms?

• Add another water molecule.

• Increase the temperature.

• Remove oxygen atoms.

• Add more carbon atoms.

What does the law of conservation of mass state about atoms during a chemical change?

• Atoms are rearranged but not lost or gained.

• Atoms are only lost.

• Atoms are only gained.

• Atoms are created and destroyed.