Question 1

Which law states that the total mass of substances present after a chemical reaction is the same as the mass before the reaction?

Accepted Answer

Law of Conservation of Mass

Question 2

Which experiment led to the discovery of the electron and its charge-to-mass ratio?

Accepted Answer

J. J. Thomson's Cathode Ray Tube Experiment

Question 3

Which of the following statements is NOT a postulate of Dalton’s atomic theory?

Accepted Answer

Atoms are created and destroyed in chemical reactions.

Question 4

A sample of two compounds, CO and CO$$_2$$, contains 12 g of carbon in each. If the mass of oxygen in CO is 16 g, what is the mass of oxygen in CO$$_2$$? What law does this illustrate?

Accepted Answer

32 g; Law of Multiple Proportions

Question 5

Which of the following best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons

Question 6

Which subatomic particle is responsible for the identity of an element?

Accepted Answer

Proton

Question 7

A neutral atom of chlorine has an atomic number of 17 and a mass number of 35. How many neutrons does it have?

Accepted Answer

18

Question 8

Which of the following elements is a metalloid?

Accepted Answer

Silicon

Question 9

Which of the following is a diatomic molecule found naturally in the atmosphere?

Accepted Answer

O$$_2$$

Question 10

What is the empirical formula for glucose, C$$_6H$_{12}O$_6$$?

Accepted Answer

CH$$_2O$$

Question 11

Which of the following compounds is an ionic compound?

Accepted Answer

NaCl

Question 12

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

Accepted Answer

Iron(III) chloride

Question 13

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

Accepted Answer

$$(NH_4$)_2SO_4$$

Question 14

Which acid is formed when HNO$$_3 is $$dissolved in water?

Accepted Answer

Nitric acid

Question 15

What is the name of the compound N$$_2O$_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 16

Which of the following is a correct statement about the periodic table?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 17

Which of the following is the correct name for H$$_2SO$_4$$?

Accepted Answer

Sulfuric acid

Question 18

Which of the following is a polyatomic ion?

Accepted Answer

NO$$_3^-$$

Question 19

Which of the following is the correct formula for dinitrogen tetroxide?

Accepted Answer

N$$_2O$_4$$

Question 20

Which of the following best describes the difference between 1-propanol and 2-propanol?

Accepted Answer

They are isomers with the same molecular formula but different structures.

Atoms, Molecules, and Ions: Foundations of Modern Chemistry

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