Question 1

Which scientist is credited with modernizing the Atomic Theory in 1803?

Accepted Answer

John Dalton

Question 2

According to Dalton’s Atomic Theory, which statement is FALSE?

Accepted Answer

Atoms can be divided into smaller particles by chemical reactions.

Question 3

Dalton used the ideas of which two earlier scientists to develop his atomic theory?

Accepted Answer

Democritus and Lavoisier

Question 4

Which of the following is NOT a component of Dalton’s Atomic Theory?

Accepted Answer

Atoms are composed of protons, neutrons, and electrons.

Question 5

Dalton stated that the lightest element as the standard for atomic mass. What is this element?

Accepted Answer

Hydrogen

Question 6

Which statement best describes a chemical reaction according to Dalton’s Atomic Theory?

Accepted Answer

A chemical reaction rearranges the grouping of atoms.

Question 7

Which of the following statements is consistent with Dalton’s atomic theory as it was originally stated?

Accepted Answer

All lead atoms are identical.

Question 8

According to Dalton’s Atomic Theory, how do compounds form?

Accepted Answer

Atoms of different elements combine in simple, whole number ratios.

Question 9

Which of the following is a real-world example that supports Dalton’s idea that atoms combine in fixed ratios?

Accepted Answer

Water always has a 2:1 ratio of hydrogen to oxygen atoms.

Question 10

If barium and chlorine atoms combine in a 1:2 ratio to form barium chloride ($$BaCl_2$$), which Dalton’s postulate does this illustrate?

Accepted Answer

Atoms combine in simple, whole number ratios to form compounds.

Question 11

Which of the following would be a violation of Dalton’s Atomic Theory?

Accepted Answer

Atoms of the same element having different masses.

Question 12

Which of the following equations represents the law of conservation of mass, as supported by Dalton’s Atomic Theory?

Accepted Answer

$$\sum m_{reactants} = \sum m_{products}$$

Question 13

Which statement about atoms is NOT part of Dalton’s Atomic Theory?

Accepted Answer

Atoms are made of smaller particles called protons, neutrons, and electrons.

Question 14

Which of the following best explains why uranium atoms undergo alpha decay to become thorium atoms?

Accepted Answer

This process is not explained by Dalton’s original atomic theory.

Question 15

Which of the following is a limitation of Dalton’s Atomic Theory based on modern discoveries?

Accepted Answer

Atoms can be divided into subatomic particles.

Foundations of Atomic Theory: Democritus, Dalton, and the Atomic Theory

Study Guide - Practice Questions