Question

chemistry
exit ticket: early ideas about matter
name: madison clarke
period: 4
date: oct 8th
grade: 11th
instructions: answer the following questions as completely as you can.

1. multiple choice (circle the correct answer)

which scientist is known for the law of conservation of mass?
a) democritus
b) aristotle
c) antoine lavoisier
d) john dalton

1. short answer

a. what did democritus propose about the nature of matter?
b. give one difference between a mixture and a compound.

Explanation:

1. Antoine Lavoisier is credited with the Law of Conservation of Mass. He was a pioneer in modern - day chemistry and through his experiments, he showed that mass is conserved in chemical reactions.

2a. Democritus proposed that matter is made up of tiny, indivisible particles called atoms.
2b. A compound has a fixed chemical composition and is formed by chemical reactions, while a mixture has a variable composition and is formed by physical combinations.

Answer:

1. c) Antoine Lavoisier

2a. Matter is made up of tiny, indivisible particles called atoms.
2b. A compound has a fixed chemical composition and is formed by chemical reactions, while a mixture has a variable composition and is formed by physical combinations.