Question 1

Which instrument is most commonly used today to observe individual atoms, as referenced in the study materials?

Accepted Answer

A scanning electron microscope

Question 2

According to Dalton’s atomic theory, which statement is correct?

Accepted Answer

Atoms of the same element are identical in mass and properties.

Question 3

Democritus described atoms as:

Accepted Answer

Indivisible and indestructible particles

Question 4

Which of the following best explains why Dalton’s atomic theory is considered a scientific theory, while Democritus’s ideas are not?

Accepted Answer

Dalton’s theory was based on experimental evidence and explained chemical behavior.

Question 5

A petri dish contains drops of liquid mercury. According to Dalton’s atomic theory, what would be true if you divided the mercury into smaller and smaller drops?

Accepted Answer

Each drop would still have the chemical properties of mercury until you reach a single atom.

Question 6

If you could line up $$1 	imes 10^8$ copper atoms side by side, what would be the approximate length of the line?

Accepted Answer

$$1 cm$$

Question 7

Which of the following is NOT a postulate of Dalton’s atomic theory?

Accepted Answer

Atoms can be changed into other elements during chemical reactions.

Question 8

A sample of copper with a mass of $$63.5 g $$contains $$6.02 	imes 10$$^{23}$$ atoms. What is the mass of a single copper atom?

Accepted Answer

$$1.05 	imes 10$$^{-22}$$ g

Question 9

Which of the following best describes the difference between a mixture and a compound, according to Dalton’s atomic theory?

Accepted Answer

A mixture contains atoms of different elements not chemically combined, while a compound contains atoms chemically combined in fixed ratios.

Question 10

Which real-world technology allows scientists to manipulate and arrange individual atoms, as discussed in the study materials?

Accepted Answer

Scanning electron microscopes

Question 11

Which of the following statements is supported by Dalton’s atomic theory and modern evidence?

Accepted Answer

Atoms of a given element are identical in their chemical properties.

Question 12

Why is the word 'atom' derived from the Greek word 'atomos'?

Accepted Answer

Because it means 'indivisible', reflecting the belief that atoms cannot be divided further.

Question 13

Which of the following is a practical application of atomic-scale technology mentioned in the study materials?

Accepted Answer

Creation of atomic-sized electronic devices such as circuits and computer chips

Question 14

Which of the following best explains why all drops of mercury, regardless of size, have the same properties?

Accepted Answer

They are all made of the same kind of atoms.

Question 15

If the average width of an atom is $$1.0 	imes 10$$^{-10}$$ m, about how many atoms wide is a nanocar that is 2$ nm across?

Accepted Answer

20 atoms

Atomic Structure: Early Models and Dalton’s Atomic Theory

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