Q: Millikan’s oil drop experiment determined the charge of the electron. What was the value he found?

$$1.602 \times 10$$^{-19}$$ coulombs

Question 1

Which statement best describes the difference in atomic/molecular motion between solids, liquids, and gases, as shown in the diagram and table?

Accepted Answer

In solids, atoms oscillate/vibrate about fixed points; in liquids, atoms are free to move relative to one another; in gases, atoms are free to move and are far apart.

Question 2

Which property is unique to gases compared to solids and liquids, according to Table 3.1?

Accepted Answer

Indefinite volume

Question 3

Based on the periodic table, which element is a metalloid?

Accepted Answer

Silicon (Si)

Question 4

Dalton’s atomic theory states that atoms of a given element are identical. Which modern discovery contradicts this statement?

Accepted Answer

The existence of isotopes

Question 5

In J.J. Thomson’s cathode ray experiment, what evidence led to the conclusion that electrons are negatively charged?

Accepted Answer

The cathode ray was attracted to the positive electrode and repelled by the negative electrode.

Question 6

Millikan’s oil drop experiment determined the charge of the electron. What was the value he found?

Accepted Answer

$$1.602 	imes 10$$^{-19}$$ coulombs

Question 7

Rutherford’s gold foil experiment led to which major conclusion about atomic structure?

Accepted Answer

Atoms are mostly empty space with a dense nucleus at the center.

Question 8

Which type of radiation is deflected toward the positive electrode in the experiment shown?

Accepted Answer

Beta radiation

Question 9

Given the isotope $$^{65}	ext{Zn}$$, how many neutrons does it have?

Accepted Answer

27

Question 10

Which classification best describes a mixture of oil and water, as shown in the diagram?

Accepted Answer

Heterogeneous mixture

Question 11

Which type of chemical bond involves electron transfer from a metal to a nonmetal?

Accepted Answer

Ionic bond

Question 12

What is the formula for the compound formed between $$	ext{Ca}^{2+}$$ and $$	ext{ClO}_3^-$$?

Accepted Answer

$$	ext{Ca(ClO}_3)_2$$

Question 13

How many carbon atoms are present in the molecule $$	ext{C}_2	ext{H}_5	ext{COOCH}_3$$?

Accepted Answer

5

Question 14

What is the correct name for $$	ext{HClO}_2$$?

Accepted Answer

Chlorous acid

Question 15

Which of the following is a binary acid?

Accepted Answer

$$	ext{HCl}$$

Question 16

If a sample contains $$7.4 	imes 10$$^{21}$$ calcium ions, how many iodide ions are present in the compound $$	ext{CaI}_2$$?

Accepted Answer

$$1.48 	imes 10$$^{22}$$

Question 17

Which compound has stronger ionic attractions: lithium oxide ($$	ext{Li}_2	ext{O}) or $$magnesium oxide ($$	ext{MgO}$$), given their ionic radii?

Accepted Answer

Magnesium oxide, because magnesium ions are smaller and have a higher charge.

Question 18

What is the formula mass of $$	ext{CuSO}_4 \cdot 5	ext{H}_2	ext{O}$$? (Atomic masses: Cu = 63.55, S = 32.07, O = 16.00, H = 1.01)

Accepted Answer

$$249.68$$ amu

Question 19

How many molecules are in $$0.500$$ mol of water?

Accepted Answer

$$3.01 	imes 10$$^{23}$$

Question 20

Which of the following is a main group element?

Accepted Answer

Sodium (Na)

Atoms, Molecules, and Ions: Foundations of Chemical Structure and Nomenclature

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