Chem 103 Ch. 2 Flashcards


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1

What was Democritus's contribution to atomic theory?

Democritus described the tiny ultimate particle as "atomos" (which means "cannot be cut")

2

Why did the idea that matter was continuous (rather than atomic) prevail for so long?

Matter appears continuous, and without experimental chemistry, there is no way to prove that matter is not continuous.

3

What discoveries finally refuted the idea that matter was continuous?

law of definite proportions and multiple proportions

4

What were Boyle's contributions to modern chemistry?

Boyle stated that if a substance could be broken down into simpler substances, it was not an element.

5

Describe Lavoisier's contribution to the development of modern chemistry.

Lavoisier is the "father" of modern chemistry. He was the first to carry out a series of experiments in which the masses of reactants and products were carefully recorded. These experiments led Lavoisier to formulate the Law of Conservation of Mass.

6

What law does the following list of compounds illustrate? N2O, NO, NO2, N2O4

The law of multiple proportions

7

How is Avogadro's number linked with the concept of the mole?

A) Avogadro's number represents the number of particles contained in one mole.

B) Avogadro's number represents the number of protons contained in one mole.

C) Avogadro's number represents the number of electrons contained in one mole.

D) Avogadro's number represents the number of neutrons contained in one mole.

A) Avogadro's number represents the number of particles contained in one mole.

8

How many atoms are in a mole of nitrogen?

6.02 x 10^23