Question 1

Which ancient Greek philosopher argued that matter is discontinuous and can be divided only up to a fundamental particle called 'atomos'?

Accepted Answer

Democritus

Question 2

According to Dalton's Atomic Theory, which statement is TRUE about atoms of a given element?

Accepted Answer

Atoms of a given element are identical in mass and properties.

Question 3

Which experiment led J.J. Thomson to discover the electron?

Accepted Answer

Cathode ray tube experiment

Question 4

Dalton's Atomic Theory states that chemical compounds contain atoms in small whole-number ratios. Which of the following best represents this concept for water?

Accepted Answer

$$\mathrm{H_2O}$$

Question 5

Which of the following is NOT a postulate of Dalton's Atomic Theory?

Accepted Answer

Atoms can be created or destroyed in chemical reactions.

Question 6

J.J. Thomson determined the charge-to-mass ratio of which subatomic particle?

Accepted Answer

Electron

Question 7

If two atoms of hydrogen combine with one atom of oxygen, which compound is formed according to Dalton's theory?

Accepted Answer

$$\mathrm{H_2O}$$

Question 8

Which statement about the Crookes discharge tube experiment is correct?

Accepted Answer

It helped determine the charge-to-mass ratio of electrons.

Question 9

Dalton's Atomic Theory states that atoms of different elements combine in simple whole-number ratios. Which of the following is an example of this postulate?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 10

Which of the following best describes the significance of Dalton's Atomic Theory in the development of modern chemistry?

Accepted Answer

It provided a scientific explanation for the law of definite proportions.

Question 11

Which real-world example illustrates Dalton's postulate that atoms of different elements combine in more than one ratio to form different compounds?

Accepted Answer

Water ($$\mathrm{H_2O}) $$and hydrogen peroxide ($$\mathrm{H_2O_2})$$

Question 12

Which statement about Aristotle's view of matter is correct?

Accepted Answer

He argued that all matter is continuous.

Question 13

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

Accepted Answer

Atoms are indivisible and indestructible.

Question 14

Which concept did Democritus introduce that is still relevant in modern atomic theory?

Accepted Answer

Matter is composed of indivisible particles called atoms.

Question 15

Which of the following best describes the charge-to-mass ratio ($$\frac{e}{m}) $$determined by J.J. Thomson?

Accepted Answer

It is a property of electrons.

Question 16

Which of the following compounds demonstrates Dalton's postulate that atoms can combine in more than one ratio to form different compounds?

Accepted Answer

$$\mathrm{CO}$$ and $$\mathrm{CO_2$}$$

Question 17

Which statement about Dalton is correct?

Accepted Answer

He was a polymath who contributed to chemistry, physics, and meteorology.

Question 18

Which of the following is a direct result of Dalton's postulate that atoms are indivisible?

Accepted Answer

Atoms cannot be split into smaller particles by chemical means.

Question 19

Which of the following best explains why Dalton's theory was a major advancement over ancient Greek philosophy?

Accepted Answer

Dalton's theory was based on experimental evidence and scientific reasoning.

Models of the Atom: Foundations of Atomic Theory in General Chemistry

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