Question 1

Which of the following statements best describes Dalton's second postulate of atomic theory?

Accepted Answer

Atoms of a given element are identical in mass and other properties, but atoms of different elements are different.

Question 2

A sample of hydrogen sulfide ($$H_2S) $$weighing 6.500 g is decomposed into its elements. If 0.384 g of hydrogen is obtained, how many grams of sulfur are produced, and which fundamental law does this experiment demonstrate?

Accepted Answer

6.116 g of sulfur; Law of Conservation of Mass

Question 3

Which experiment provided the first accurate measurement of the charge of the electron?

Accepted Answer

Millikan oil-drop experiment

Question 4

What is the charge and relative mass of a neutron?

Accepted Answer

Charge: 0, Relative mass: 1

Question 5

Which of the following pairs are isotopes of each other?

Accepted Answer

$$^{13}Sn$$ and $$^{120}Sn$$

Question 6

Calculate the atomic weight of silicon given the following isotopes: $$^{28}Si (92.23$$%, 27.97693 amu), $$^{29}Si (4.68$$%, 28.97649 amu), $$^{30}Si (3.09$$%, 29.97377 amu).

Accepted Answer

$$28.09$$ amu

Question 7

Which of the following elements is an alkaline earth metal?

Accepted Answer

Magnesium

Question 8

Which law states that the total mass of substances present at the end of a chemical process is the same as the mass of substances present before the process took place?

Accepted Answer

Law of Conservation of Mass

Question 9

Which of the following compounds is molecular?

Accepted Answer

PF$$_5$$

Question 10

What is the empirical formula for glucose ($$C_6H_{12}O_6$)?

Accepted Answer

$$CH_2O$$

Question 11

Which of the following elements is a metalloid?

Accepted Answer

Silicon

Question 12

What is the correct chemical formula for a compound formed between Ca$$^{2+}$$ and Br$$^-$$ ions?

Accepted Answer

$$CaBr_2$$

Question 13

Which of the following acids is correctly named according to the rules for acid nomenclature?

Accepted Answer

HClO$$_4$$ — perchloric acid

Question 14

Which statement about isotopes is correct?

Accepted Answer

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

Question 15

Which of the following is a diatomic molecule that occurs naturally?

Accepted Answer

Oxygen

Question 16

What is the correct name for the compound $$FeCl_3$$?

Accepted Answer

Iron(III) chloride

Question 17

Which of the following is the correct structural formula for 2-propanol?

Accepted Answer

$$CH_3CHOHCH_3$$

Question 18

Which of the following is a correct application of the Law of Multiple Proportions?

Accepted Answer

The ratio of oxygen to carbon in CO and CO$$_2 is a $$small whole number.

Question 19

Which of the following is the correct formula for potassium sulfate?

Accepted Answer

$$K_2SO_4$$

Atoms, Molecules, and Ions: Foundations of General Chemistry

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