Question

After learning about the law of conservation of mass, Remy began to wonder about how to best test this law. She wanted to show that the amounts of matter did not change but produced an equal amount of a different kind of matter. What is the best way to study this law?

a.) in a heterogeneous mixture

b.) in a homogeneous mixture

c.) in a open system

d.) in a closed system

Answer 1

Answer is: d.) in a closed system.

Conservation of mass: during chemical reaction no particles are created or destroyed, the atoms are rearranged from the reactants to the products.

Closed system is a physical system that does not allow transfer of mass and energy in or out of the system.

For example, chemical reaction: 2CH₃OH + 3O₂ → 2CO₂ + 4H₂O.

1) There are four hydrogen atoms, one carbon atom, four oxygen atoms in this chemical reaction.

2) There are eight hydrogen atoms, two carbon atoms, eight oxygen atoms in this chemical reaction.