Question 1

Which law is illustrated by the fact that the total mass of butane and oxygen before a reaction equals the total mass of carbon dioxide and water after the reaction, as shown in the equation: $$58\ 	ext{g} + 208\ 	ext{g} = 176\ 	ext{g} + 90\ 	ext{g}$$?

Accepted Answer

Law of Conservation of Mass

Question 2

Which scientist is credited with discovering the Law of Constant Composition, which states that the relative number of atoms of each element in a compound is the same in any sample?

Accepted Answer

Joseph Proust

Question 3

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

Accepted Answer

Atoms can be created or destroyed in chemical reactions.

Question 4

Which of the following best describes the Law of Multiple Proportions?

Accepted Answer

If two elements form more than one compound, the ratios of the masses of the second element that combine with a fixed mass of the first element are small whole numbers.

Question 5

An atom of $$^{197}	ext{Au}$$ contains 79 protons. How many neutrons does it have?

Accepted Answer

118

Question 6

Which of the following atoms has the largest number of neutrons: $$^{148}	ext{Eu}$$, $$^{157}	ext{Dy}$$, $$^{149}	ext{Nd}$$, $$^{162}	ext{Ho}$$, $$^{159}	ext{Gd}$$?

Accepted Answer

$$^{162}	ext{Ho}$$

Question 7

Which statement about isotopes is correct?

Accepted Answer

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

Question 8

Naturally occurring chlorine is 75.78% $$^{35}	ext{Cl} ($$atomic mass 34.969 amu) and 24.22% $$^{37}	ext{Cl} ($$atomic mass 36.966 amu). What is the atomic weight of chlorine?

Accepted Answer

$$35.45\ 	ext{amu}$$

Question 9

Which two elements would you expect to show the greatest similarity in chemical and physical properties: B, Ca, F, He, Mg, P?

Accepted Answer

Ca and Mg

Question 10

Which of the following elements is a metalloid?

Accepted Answer

Silicon (Si)

Question 11

Which of the following compounds is molecular?

Accepted Answer

CBr4

Question 12

What is the empirical formula for glucose, whose molecular formula is $$	ext{C}_6	ext{H}_{12}	ext{O}_6$$?

Accepted Answer

$$	ext{CH}_2	ext{O}$$

Question 13

Which of the following ions has a noble-gas electron arrangement?

Accepted Answer

Ti$$^{4+}$$

Question 14

What is the empirical formula for the compound formed by Na$$^+$$ and PO$$_4$$^{3-}$$?

Accepted Answer

$$	ext{Na}_3	ext{PO}_4$$

Question 15

Which of the following acids is incorrectly named?

Accepted Answer

nitrous acid, HNO3

Question 16

What is the correct name for the compound FeCl$$_3$$?

Accepted Answer

Iron(III) chloride

Question 17

What is the chemical formula for carbonic acid?

Accepted Answer

$$	ext{H}_2	ext{CO}_3$$

Question 18

Which of the following binary molecular compounds is named correctly?

Accepted Answer

CO: carbon monoxide

Question 19

Which of the following statements about the periodic table is correct?

Accepted Answer

Elements in the same group have similar chemical properties.

CHM113, ch2. Atoms, Molecules, and Ions: Foundations of Chemical Structure and Nomenclature

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