Question

multiple choice 1 point
what was antoine lavoisiers contribution to the law of conservation of mass?
he was the first person to think of it.
he was the first person to propose it in a scientific way.
he came up with a widely - read, precise description.
he was the first person to perform a chemical reaction.
multiple choice 1 point
which of the following describes a chemical reaction?
oxygen interacts with iron to form rust.
ice melts into water.
carbon dioxide freezes to make dry ice.

Explanation:

Antoine - Lavoisier came up with a widely - read, precise description of the law of conservation of mass. For the second question, iron reacting with oxygen to form rust is a chemical reaction as new substances are formed. Ice melting into water and carbon dioxide freezing to make dry ice are physical changes.

Answer:

1. He came up with a widely - read, precise description.
2. Oxygen interacts with iron to form rust.