Question 1

The most accurate way to determine atomic mass is with a mass spectrometer.

Accepted Answer

A) True 
 B)False

Question 2

Write the formula for a compound consisting of 3 sodium atoms,1 phosphorus atom,and 4 oxygen atoms.

Accepted Answer

A) S3PO4 
B) 3NaP4O 
C) Na3P2(O2) 
D) Na3PO4 
A) S3PO4 
B) 3NaP4O 
C) Na3P2(O2) 
D) Na3PO4

Question 3

How many moles of N2O contain the same number of nitrogen atoms as 4.60 g of NO2?

Accepted Answer

A) 0.500 
B) 0.0500 
C) 0.100 
D) 0.200 
A) 0.500 
B) 0.0500 
C) 0.100 
D) 0.200

Question 4

One mole of H2O contains 2.0 grams of hydrogen.

Accepted Answer

A) True 
 B)False

Question 5

The formula for dinitrogen monoxide is N2O.If a sample of the oxide was found to contain 0.0800 g of oxygen,how many grams of nitrogen would it contain?

Accepted Answer

A) 0.140 
B) 0.280 
C) 0.560 
D) 0.0700 
A) 0.140 
B) 0.280 
C) 0.560 
D) 0.0700

Question 6

A diet is planned for a trip on a space ship and is lacking in milk,but is rich in turnips and broccoli.Such a diet could provide a sufficient amount of calcium for adults.

Accepted Answer

A) True 
 B)False

Question 7

How many moles of Na2Cr2O7 contain 14 moles of oxygen atoms?

Accepted Answer

A) 2 mol Na2Cr2O7 
B) 14 mol Na2Cr2O7 
C) 7 mol Na2Cr2O7 
D) 1 mol Na2Cr2O7 
A) 2 mol Na2Cr2O7 
B) 14 mol Na2Cr2O7 
C) 7 mol Na2Cr2O7 
D) 1 mol Na2Cr2O7

Question 8

A molecular formula

Accepted Answer

A) is represented using the symbols of the elements in the formula. 
B) is represented using a system of circles that contain different symbols. 
C) cannot be represented conveniently using symbols for the elements. 
D) is represented using words rather than symbols. 
A) is represented using the symbols of the elements in the formula. 
B) is represented using a system of circles that contain different symbols. 
C) cannot be represented conveniently using symbols for the elements. 
D) is represented using words rather than symbols.

Question 9

What mass of arsenic (As)in grams contains the same number of atoms as 39.95 g of argon (Ar)?

Accepted Answer

A) 33.0 
B) 74.92 
C) 4.16 
D) 149.84 
A) 33.0 
B) 74.92 
C) 4.16 
D) 149.84

Question 10

Which of the following uses the unit of "u" or "amu"?

Accepted Answer

A) atomic weights of atoms 
B) relative masses of atoms 
C) molecular weights of molecules 
D) more than one response is correct 
A) atomic weights of atoms 
B) relative masses of atoms 
C) molecular weights of molecules 
D) more than one response is correct

Question 11

Isotopes differ from each other in what way?

Accepted Answer

A) They have different numbers of protons in the nucleus. 
B) They have different numbers of neutrons in the nucleus. 
C) They have different numbers of electrons outside the nucleus. 
D) More than one response is correct. 
A) They have different numbers of protons in the nucleus. 
B) They have different numbers of neutrons in the nucleus. 
C) They have different numbers of electrons outside the nucleus. 
D) More than one response is correct.

Question 12

Naturally occurring lithium (Li)consists of only two isotopes,Li-6 (6.02 u)and Li-7 (7.02 u),where the isotopic masses are given in parentheses.Use the periodic table and determine which isotope is present in the larger percentage in the natural element.

Accepted Answer

A) Li-6 
B) Li-7 
C) each is present at 50% 
D) cannot be determined from the information available 
A) Li-6 
B) Li-7 
C) each is present at 50% 
D) cannot be determined from the information available

Question 13

Using whole numbers,determine the molecular weight of calcium hydroxide,Ca(OH)2.

Accepted Answer

A) 56 
B) 57 
C) 58 
D) 74 
A) 56 
B) 57 
C) 58 
D) 74

Question 14

The symbols for elements with accepted names

Accepted Answer

A) consist of a single capital letter. 
B) consist of a capital letter and a small letter. 
C) consist of either a single capital letter or a capital letter and a small letter. 
D) No answer is correct. 
A) consist of a single capital letter. 
B) consist of a capital letter and a small letter. 
C) consist of either a single capital letter or a capital letter and a small letter. 
D) No answer is correct.

Question 15

Which of the following is located in the nucleus of an atom?

Accepted Answer

A) protons 
B) neutrons 
C) electrons 
D) protons and neutrons 
A) protons 
B) neutrons 
C) electrons 
D) protons and neutrons

Question 16

What is wrong with the following molecular formula: SOO (sulfur dioxide)?

Accepted Answer

A) OSO is the correct form 
B) SO should be So 
C) OO should be written as O2 
D) OO should be written as O2 
A) OSO is the correct form 
B) SO should be So 
C) OO should be written as O2 
D) OO should be written as O2

Question 17

In naturally occurring samples,all elements exist as a mixture of isotopes.

Accepted Answer

A) True 
 B)False

Question 18

The pure substance,water,contains both hydrogen molecules and oxygen molecules.

Accepted Answer

A) True 
 B)False

Question 19

You discover a new element which consists of two isotopes.The first isotope,243X (mass = 242.45 u)comprises 40.000% of the total.The second isotope,248X (mass = 247.11 u)accounts for the rest.What would be the average atomic mass for your new element?

Accepted Answer

A) 242.45 u 
B) 244.32 u 
C) 245.25 
D) 247.11 
A) 242.45 u 
B) 244.32 u 
C) 245.25 
D) 247.11

Question 20

How many protons are found in the nucleus of a boron-11 (11B)atom?

Accepted Answer

A) 11 
B) 6 
C) 5 
D) 4 
A) 11 
B) 6 
C) 5 
D) 4

Exam 2: Atoms and Molecules

The most accurate way to determine atomic mass is with a mass spectrometer.

Write the formula for a compound consisting of 3 sodium atoms,1 phosphorus atom,and 4 oxygen atoms.

How many moles of N2O contain the same number of nitrogen atoms as 4.60 g of NO2?

One mole of H2O contains 2.0 grams of hydrogen.

The formula for dinitrogen monoxide is N2O.If a sample of the oxide was found to contain 0.0800 g of oxygen,how many grams of nitrogen would it contain?

A diet is planned for a trip on a space ship and is lacking in milk,but is rich in turnips and broccoli.Such a diet could provide a sufficient amount of calcium for adults.

How many moles of Na2Cr2O7 contain 14 moles of oxygen atoms?

A molecular formula

What mass of arsenic (As)in grams contains the same number of atoms as 39.95 g of argon (Ar)?

Which of the following uses the unit of "u" or "amu"?

Isotopes differ from each other in what way?

Naturally occurring lithium (Li)consists of only two isotopes,Li-6 (6.02 u)and Li-7 (7.02 u),where the isotopic masses are given in parentheses.Use the periodic table and determine which isotope is present in the larger percentage in the natural element.

Using whole numbers,determine the molecular weight of calcium hydroxide,Ca(OH)2.

The symbols for elements with accepted names

Which of the following is located in the nucleus of an atom?

What is wrong with the following molecular formula: SOO (sulfur dioxide)?

In naturally occurring samples,all elements exist as a mixture of isotopes.

The pure substance,water,contains both hydrogen molecules and oxygen molecules.

You discover a new element which consists of two isotopes.The first isotope,243X (mass = 242.45 u)comprises 40.000% of the total.The second isotope,248X (mass = 247.11 u)accounts for the rest.What would be the average atomic mass for your new element?

How many protons are found in the nucleus of a boron-11 (11B)atom?

Matter, measurements, and Calculations

Electronic Structure and the Periodic Law

Forces Between Particles

Chemical Reactions

The States of Matter

Solutions and Colloids

Reaction Rates and Equilibrium

Acids, bases, and Salts

Radioactivity and Nuclear Processes

Organic Compounds: Alkanes

Unsaturated Hydrocarbons

Alcohols, phenols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Esters

Amines and Amides

Carbohydrates

Lipids

Proteins

Enzymes

Nucleic Acids and Protein Synthesis

Nutrition and Energy for Life

Carbohydrate Metabolism

Lipid and Amino Acid Metabolism

Body Fluids

Filters

How many moles of N₂O contain the same number of nitrogen atoms as 4.60 g of NO₂?

One mole of H₂O contains 2.0 grams of hydrogen.

The formula for dinitrogen monoxide is N₂O.If a sample of the oxide was found to contain 0.0800 g of oxygen,how many grams of nitrogen would it contain?

How many moles of Na₂Cr₂O₇ contain 14 moles of oxygen atoms?

Using whole numbers,determine the molecular weight of calcium hydroxide,Ca(OH)₂.

You discover a new element which consists of two isotopes.The first isotope,²⁴³X (mass = 242.45 u)comprises 40.000% of the total.The second isotope,²⁴⁸X (mass = 247.11 u)accounts for the rest.What would be the average atomic mass for your new element?

How many protons are found in the nucleus of a boron-11 (¹¹B)atom?