Q: If the charge-to-mass ratio of an electron is $$-1.76 \times 10^8$\ \mathrm{C/g}$$ and the charge of an electron is $$-1.60 \times 10$$^{-19}$$\ \mathrm{C}$$, what is the mass of an electron?

$$9.10 \times 10$$^{-28}$$\ \mathrm{g}$$

Question 1

According to the Law of Conservation of Mass, if 50.0 grams of hydrogen react with nitrogen to produce 92.5 grams of ammonia, what is the minimum mass of nitrogen required for the reaction?

Accepted Answer

$$42.5\ \mathrm{g}$$

Question 2

Which of the following best illustrates the Law of Definite Proportions?

Accepted Answer

Two different samples of sodium chloride have the same mass ratio of sodium to chlorine.

Question 3

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

Accepted Answer

Atoms are composed of protons, neutrons, and electrons.

Question 4

Which of the following is an example of the Law of Multiple Proportions?

Accepted Answer

Two different compounds formed from carbon and oxygen have the following mass ratios: 1.33 g O to 1 g C and 2.66 g O to 1 g C.

Question 5

In the Millikan oil drop experiment, what was the primary purpose of the charged metal plates?

Accepted Answer

To create an electric field that could balance the gravitational force on the oil droplets.

Question 6

If the charge-to-mass ratio of an electron is $$-1.76 	imes 10^8$\ \mathrm{C/g}$$ and the charge of an electron is $$-1.60 	imes 10$$^{-19}$$\ \mathrm{C}$$, what is the mass of an electron?

Accepted Answer

$$9.10 	imes 10$$^{-28}$$\ \mathrm{g}$$

Question 7

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

Accepted Answer

Atoms have a small, dense, positively charged nucleus.

Question 8

Which of the following statements is TRUE regarding subatomic particles?

Accepted Answer

Protons and electrons have charges of the same magnitude but opposite signs.

Question 9

How many electrons are required to produce a charge of $$-2.0\ \mathrm{C}$$? (Charge of one electron $$= -1.602 	imes 10$$^{-19}$$\ \mathrm{C})$$

Accepted Answer

$$1.25 	imes 10$$^{19}$$

Question 10

A neutral atom of calcium-43 has how many protons, neutrons, and electrons?

Accepted Answer

20 protons, 23 neutrons, 20 electrons

Question 11

Which of the following ions is isoelectronic with $$^{40}_{20}\mathrm{Ca}^{2+}$$?

Accepted Answer

$$^{40}_{18}\mathrm{Ar}$$

Question 12

Which element is a metalloid that is also a chalcogen?

Accepted Answer

Te

Question 13

Which of the following elements is a nonmetal that is a homonuclear polyatomic solid at room temperature?

Accepted Answer

Sulfur

Question 14

Which of the following ions is unlikely to occur based on periodic trends?

Accepted Answer

$$\mathrm{Al}^{3-}$$

Question 15

What is the systematic name for the polyatomic ion $$\mathrm{NO}_2^-$$?

Accepted Answer

Nitrite

Question 16

What is the correct name for the compound $$\mathrm{Al($$BrO_4$$)_3}$$?

Accepted Answer

Aluminum perbromate

Question 17

What is the chemical formula for sodium dichromate?

Accepted Answer

$$\mathrm{Na_2Cr_2O_7}$$

Question 18

Which of the following is a representative element, found in the 3rd Period, that is also a pnictogen?

Accepted Answer

P

Question 19

Which of the following elements has physical properties most similar to barium (Ba)?

Accepted Answer

Calcium (Ca)

Question 20

What is the systematic name for the compound $$\mathrm{H_2S}$$?

Accepted Answer

Hydrosulfuric acid

Elements, Compounds, and the Laws of Chemical Combination: Structured Study Notes

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