Question 1

Location: outside nucleus   ,

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 D

Question 2

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

Accepted Answer

A) True 
 B)False  False

Question 3

Individuals,ages 19-70,should include at least 1000 mg of calcium in their daily diet.What is the minimum number of one-gram calcium supplement tablets you would need to take each day to meet this requirement if a tablet is 40% by mass calcium?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4 C

Question 4

One mole of silver would contain the same number of atoms as a mole of gold.

Accepted Answer

A) True 
 B)False

Question 5

Consider the representation shown below.It should be classified as

Accepted Answer

A) an element consisting of 6 atoms. 
B) a compound containing atoms of two elements. 
C) a homogenous mixture of two elements. 
D) a homogenous mixture of two compounds. 
A) an element consisting of 6 atoms. 
B) a compound containing atoms of two elements. 
C) a homogenous mixture of two elements. 
D) a homogenous mixture of two compounds.

Question 6

A neutral isotope of an element contains 21 electrons and 24 neutrons.What is the following representation for this nucleus?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 7

What is the reason that U-238 is different from U-235?

Accepted Answer

A) three more electrons 
B) three more protons 
C) three more neutrons 
D) there is no difference 
A) three more electrons 
B) three more protons 
C) three more neutrons 
D) there is no difference

Question 8

Atoms that have the same atomic number but differ by mass number are called?

Accepted Answer

A) protons 
B) neutrons 
C) isotopes 
D) positrons 
A) protons 
B) neutrons 
C) isotopes 
D) positrons

Question 9

Isotopes of the same element always have the same atomic number.

Accepted Answer

A) True 
 B)False

Question 10

What is the weight percentage of nitrogen in urea,CN2H4O?

Accepted Answer

A) 46.7 
B) 30.4 
C) 32.6 
D) 16.3 
A) 46.7 
B) 30.4 
C) 32.6 
D) 16.3

Question 11

H2O2 contains equal parts by weight of hydrogen and oxygen.

Accepted Answer

A) True 
 B)False

Question 12

The atomic mass number is a whole number and indicates a specific isotope of an element.

Accepted Answer

A) True 
 B)False

Question 13

The charge of the nucleus depends only on the atomic number.

Accepted Answer

A) True 
 B)False

Question 14

What is the number of moles of water in one liter of water if one gram of water takes up one milliliter of space?

Accepted Answer

A) 1 
B) 18 
C) 55.6 
D) 1000 
A) 1 
B) 18 
C) 55.6 
D) 1000

Question 15

An isotope of a given element has a mass number equal to twice the atomic number.This neutral isotope contains twelve electrons.This isotope is _____ .

Accepted Answer

A) magnesium-12. 
B) magnesium-24. 
C) chromium-24. 
D) chromium-12. 
A) magnesium-12. 
B) magnesium-24. 
C) chromium-24. 
D) chromium-12.

Question 16

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 17

Which of the following pairs are about equal in mass?

Accepted Answer

A) proton and electron 
B) electron and neutron 
C) proton and neutron 
D) nucleus and surrounding electrons 
A) proton and electron 
B) electron and neutron 
C) proton and neutron 
D) nucleus and surrounding electrons

Question 18

Isotopes of the same element always have the same atomic mass.

Accepted Answer

A) True 
 B)False

Question 19

The symbols for all of the elements are derived from the Latin names.

Accepted Answer

A) True 
 B)False

Question 20

If calcium carbonate found in limestone is 40.0% calcium,how many grams of calcium are in 485 g of calcium carbonate?

Accepted Answer

A) 12.1 g of calcium 
B) 291 g of calcium 
C) 19,400 g of calcium 
D) 194 g of calcium 
A) 12.1 g of calcium 
B) 291 g of calcium 
C) 19,400 g of calcium 
D) 194 g of calcium

Exam 2: Atoms and Molecules

Location: outside nucleus ,

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

Individuals,ages 19-70,should include at least 1000 mg of calcium in their daily diet.What is the minimum number of one-gram calcium supplement tablets you would need to take each day to meet this requirement if a tablet is 40% by mass calcium?

One mole of silver would contain the same number of atoms as a mole of gold.

Consider the representation shown below.It should be classified as

A neutral isotope of an element contains 21 electrons and 24 neutrons.What is the following representation for this nucleus?

What is the reason that U-238 is different from U-235?

Atoms that have the same atomic number but differ by mass number are called?

Isotopes of the same element always have the same atomic number.

What is the weight percentage of nitrogen in urea,CN2H4O?

H2O2 contains equal parts by weight of hydrogen and oxygen.

The atomic mass number is a whole number and indicates a specific isotope of an element.

The charge of the nucleus depends only on the atomic number.

What is the number of moles of water in one liter of water if one gram of water takes up one milliliter of space?

An isotope of a given element has a mass number equal to twice the atomic number.This neutral isotope contains twelve electrons.This isotope is _____ .

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)

Which of the following pairs are about equal in mass?

Isotopes of the same element always have the same atomic mass.

The symbols for all of the elements are derived from the Latin names.

If calcium carbonate found in limestone is 40.0% calcium,how many grams of calcium are in 485 g of calcium carbonate?

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

What is the weight percentage of nitrogen in urea,CN₂H₄O?

H₂O₂ contains equal parts by weight of hydrogen and oxygen.