Q: Which of the following is the correct calculation for the mass of an electron using the charge-to-mass ratio and the charge of an electron?

$$m = \frac{1.602 \times 10$$^{-19}$$\ \mathrm{C}}{1.758820 \times 10^8$\ \mathrm{C/g}}$$

Question 1

Which of the following statements best describes the Law of Definite Proportions?

Accepted Answer

A pure chemical compound always contains the same proportion of elements by mass.

Question 2

Which experiment provided the first evidence for the existence of electrons as negatively charged subatomic particles?

Accepted Answer

Thomson's cathode ray experiment

Question 3

A sample of water is found to contain 2.00 g of hydrogen and 16.00 g of oxygen. According to the Law of Definite Proportions, what mass of oxygen would be present if the sample contained 4.00 g of hydrogen?

Accepted Answer

$$32.00\ \mathrm{g}$$

Question 4

Which property is an example of an intensive property?

Accepted Answer

Density

Question 5

Which group of elements is characterized by being highly reactive, soft, silvery metals that react violently with water?

Accepted Answer

Alkali metals

Question 6

Which of the following is a chemical property?

Accepted Answer

Rusting of iron

Question 7

Which scientist is credited with the Law of Conservation of Mass?

Accepted Answer

Antoine Lavoisier

Question 8

A neutral atom of $$^{75}_{34}\mathrm{Se}$$ contains how many protons, neutrons, and electrons?

Accepted Answer

34 protons, 41 neutrons, 34 electrons

Question 9

Which of the following best explains why most alpha particles passed straight through the gold foil in Rutherford's experiment?

Accepted Answer

The gold atoms are mostly empty space.

Question 10

Which element is represented by an atom with 47 protons and 62 neutrons?

Accepted Answer

Silver, $$^{109}_{47}\mathrm{Ag}$$

Question 11

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 12

Which of the following is a metalloid (semimetal)?

Accepted Answer

Silicon

Question 13

Which group on the periodic table contains elements that are colorless, odorless, and extremely unreactive?

Accepted Answer

Noble gases

Question 14

Which of the following best describes the difference between metals and nonmetals?

Accepted Answer

Metals are shiny and ductile; nonmetals are often dull and brittle.

Question 15

Which law is illustrated by the fact that 12.01 g of carbon can combine with either 16.00 g or 32.00 g of oxygen to form two different compounds?

Accepted Answer

Law of Multiple Proportions

Question 16

Which of the following is the correct calculation for the mass of an electron using the charge-to-mass ratio and the charge of an electron?

Accepted Answer

$$m = \frac{1.602 	imes 10$$^{-19}$$\ \mathrm{C}}{1.758820 	imes 10^8$\ \mathrm{C/g}}$$

Question 17

Which of the following best describes the arrangement of elements in Mendeleev's original periodic table?

Accepted Answer

By increasing atomic mass and grouped by similar chemical properties

Question 18

Which of the following is an example of a physical property?

Accepted Answer

Melting point of ice

Question 19

Which group of elements combines with halogens in a 1:1 ratio?

Accepted Answer

Alkali metals

Question 20

Which scientist's work provided evidence that matter is composed of different elements that combine to form compounds?

Accepted Answer

Robert Boyle

Atoms, Elements, and the Periodic Table: Foundations of Modern Chemistry

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