Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

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 3

Naturally occurring neon (Ne)has the following isotopic composition (the mass of each isotope is given in parenthesis).Calculate the atomic weight of neon in u from these data: neon-20,90.92% (19.99 u);neon-21,0.257% (20.99 u);neon-22,8.82% (21.99 u)

Accepted Answer

A)  28.97 
B)  37.62 
C)  2017 
D)  20.17 
A)  28.97 
B)  37.62 
C)  2017 
D)  20.17

Question 4

Refer to a periodic table and tell how many helium atoms (He)would be needed to get close to the same mass as an average oxygen atom (O).

Accepted Answer

A)  six 
B)  four 
C)  twelve 
D)  one-fourth 
A)  six 
B)  four 
C)  twelve 
D)  one-fourth

Question 5

How many moles of oxygen atoms are in one mole of CO2?

Accepted Answer

A)  1 
B)  2 
C)  6.02 * 1023 
D)  12.04 * 1023 
A)  1 
B)  2 
C)  6.02 * 1023 
D)  12.04 * 1023

Question 6

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 7

What is the mass number of a carbon-13 (13C)atom?

Accepted Answer

A)  13 
B)  12 
C)  6 
D)  7 
A)  13 
B)  12 
C)  6 
D)  7

Question 8

A scanning tunneling microscope (STM)relies on a very strong light source to help see atoms.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following correctly describes subatomic particles?
Mass:   
 <   
 = n
Magnitude of charge: n <   
 =  
Location: outside nucleus  
,  
,inside nucleus n

Accepted Answer

A)  1 only 
B)  2 only 
C)  3 only 
D)  1 and 2 
A)  1 only 
B)  2 only 
C)  3 only 
D)  1 and 2

Question 10

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

Question 11

The first letter of the symbol for each of the elements is the first letter of its English name.

Accepted Answer

A) True 
 B)False

Question 12

One mole of any substance will contain one Avogadro's number of atoms of that substance.

Accepted Answer

A) True 
 B)False

Question 13

How many grams of iron (Fe)is contained in 15.8 g of Fe(OH)3?

Accepted Answer

A)  12.1 
B)  8.26 
C)  11.8 
D)  5.21 
A)  12.1 
B)  8.26 
C)  11.8 
D)  5.21

Question 14

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 15

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 16

Determine the number of electrons and protons in the element Tc.

Accepted Answer

A)  43 protons,43 electrons 
B)  43 protons,56 electrons 
C)  56 protons,43 electrons 
D)  99 protons,43 electrons 
A)  43 protons,43 electrons 
B)  43 protons,56 electrons 
C)  56 protons,43 electrons 
D)  99 protons,43 electrons

Question 17

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 18

Which of the following particles is the smallest?

Accepted Answer

A)  proton 
B)  electron 
C)  neutron 
D)  they are all the same size 
A)  proton 
B)  electron 
C)  neutron 
D)  they are all the same size

Question 19

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 20

What is the number of hydrogen atoms in a 18.016 gram sample of water?

Accepted Answer

A)  2.000 
B)  6.022 * 1023 
C)  18.02 
D)  1.204 * 1024 
A)  2.000 
B)  6.022 * 1023 
C)  18.02 
D)  1.204 * 1024

Exam 2: Atoms and Molecules

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

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

Naturally occurring neon (Ne)has the following isotopic composition (the mass of each isotope is given in parenthesis).Calculate the atomic weight of neon in u from these data: neon-20,90.92% (19.99 u);neon-21,0.257% (20.99 u);neon-22,8.82% (21.99 u)

Refer to a periodic table and tell how many helium atoms (He)would be needed to get close to the same mass as an average oxygen atom (O).

How many moles of oxygen atoms are in one mole of CO2?

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

What is the mass number of a carbon-13 (13C)atom?

A scanning tunneling microscope (STM)relies on a very strong light source to help see atoms.

Which of the following correctly describes subatomic particles? Mass: < = n Magnitude of charge: n < = Location: outside nucleus , ,inside nucleus n

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

The first letter of the symbol for each of the elements is the first letter of its English name.

One mole of any substance will contain one Avogadro's number of atoms of that substance.

How many grams of iron (Fe)is contained in 15.8 g of Fe(OH)3?

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.

Isotopes differ from each other in what way?

Determine the number of electrons and protons in the element Tc.

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.

Which of the following particles is the smallest?

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

What is the number of hydrogen atoms in a 18.016 gram sample of water?

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 oxygen atoms are in one mole of CO₂?

What is the mass number of a carbon-13 (¹³C)atom?

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

How many grams of iron (Fe)is contained in 15.8 g of Fe(OH)₃?