Question 1

An example of a metallic bond is

Accepted Answer

A)  DNA 
B)  nitrogen gas 
C)  hydrogen gas 
D)  NaCl 
E)  gold and copper 
A)  DNA 
B)  nitrogen gas 
C)  hydrogen gas 
D)  NaCl 
E)  gold and copper E

Question 2

Freezing and boiling are examples of

Accepted Answer

A)  processes that cause physical changes. 
B)  oxidation/reduction reactions. 
C)  polymerization. 
D)  temperature changes that form ionic bonds. 
E)  processes that cause chemical changes. 
A)  processes that cause physical changes. 
B)  oxidation/reduction reactions. 
C)  polymerization. 
D)  temperature changes that form ionic bonds. 
E)  processes that cause chemical changes. A

Question 3

Explain the octane method of rating gasoline.

Accepted Answer

The octane rating method is based on the gasoline's ability to withstand high compression in an engine's cylinder without igniting. Octane rating relates to the number of highly branched hydrocarbons and the branching determines how well the gasoline ignites without producing a "knock" in the engine. Pure isooctane has a rating of 100 as it never produces knocking and n-heptane has a rating of 0 as it always produces knocking.

Question 4

In which of the following places is more polymerization than depolymerization occurring?

Accepted Answer

A)  silk cocoon 
B)  cow stomach 
C)  compost heap 
D)  amino acid formation 
E)  bird's excretion 
A)  silk cocoon 
B)  cow stomach 
C)  compost heap 
D)  amino acid formation 
E)  bird's excretion

Question 5

A high octane rating in gasoline causes less engine 'knock' because

Accepted Answer

A)  high octane gas is easier to distill than low octane. 
B)  high octane is less complex hydrocarbons than low octane. 
C)  high octane can withstand high compression in a cylinder without igniting. 
D)  the isomer n-heptane is the primary component. 
E)  high octane contains small amounts of isooctane. 
A)  high octane gas is easier to distill than low octane. 
B)  high octane is less complex hydrocarbons than low octane. 
C)  high octane can withstand high compression in a cylinder without igniting. 
D)  the isomer n-heptane is the primary component. 
E)  high octane contains small amounts of isooctane.

Question 6

Describe the approach a chemist might take in designing polymers to have a shorter span of existence in a landfill.

Accepted Answer

A chemist would work on design

Question 7

Exothermic and endothermic chemical reactions differ in that

Accepted Answer

A)  energy is given off only in exothermic reactions. 
B)  energy is given off only in endothermic reactions. 
C)  the total energy in all involved electrons is the same before and after an exothermic reaction. 
D)  the total energy in all involved electrons is the same before and after an endothermic reaction. 
E)  only exothermic reactions can be observed in everyday life. 
A)  energy is given off only in exothermic reactions. 
B)  energy is given off only in endothermic reactions. 
C)  the total energy in all involved electrons is the same before and after an exothermic reaction. 
D)  the total energy in all involved electrons is the same before and after an endothermic reaction. 
E)  only exothermic reactions can be observed in everyday life.

Question 8

Your brother gives you two unfamiliar looking items and challenges you to discover which one is held together with metallic bonds and which one with ionic bonds. What test(s) would you design to meet his challenge?

Accepted Answer

Metallic is malleabl

Question 9

What are isomers?

Accepted Answer

Isomers are molecule

Question 10

When hydrochloric acid and lye combine, what are the two chemical products?

Accepted Answer

When HCl and NaOH combine, the

Question 11

If carbon were not available on Earth, what other element(s) have similar bonding potential.

Accepted Answer

Potentially, any element in th

Question 12

What are polar molecules? Give an example.

Accepted Answer

Polar molecules are clusters of atoms wi

Question 13

Which statement is true of liquid crystals?

Accepted Answer

A)  Could not be akin to the 'lipid bilayer' molecules in the primitive oceans. 
B)  Liquid crystals become less structured in the presence of an electric field. 
C)  Under the influence of an electric field, liquid crystals are a static state of matter with disordered atoms. 
D)  Polymers broken into individual parts reform as liquid crystals. 
E)  They evaporate to form plasma. 
A)  Could not be akin to the 'lipid bilayer' molecules in the primitive oceans. 
B)  Liquid crystals become less structured in the presence of an electric field. 
C)  Under the influence of an electric field, liquid crystals are a static state of matter with disordered atoms. 
D)  Polymers broken into individual parts reform as liquid crystals. 
E)  They evaporate to form plasma.

Question 14

If you drop a material that is held together by ionic bonds, one likely outcome is that it will

Accepted Answer

A)  bend. 
B)  bounce. 
C)  flow across the floor. 
D)  shatter. 
E)  be dented. 
A)  bend. 
B)  bounce. 
C)  flow across the floor. 
D)  shatter. 
E)  be dented.

Question 15

Which of the following is not characteristic of hydrogen bonds?

Accepted Answer

A)  separation of positively and negatively charged ions. 
B)  links of hydrogen to oxygen and other negative ions. 
C)  malleability and metallic bonds. 
D)  linking the two sides of the DNA double helix. 
E)  polar molecules. 
A)  separation of positively and negatively charged ions. 
B)  links of hydrogen to oxygen and other negative ions. 
C)  malleability and metallic bonds. 
D)  linking the two sides of the DNA double helix. 
E)  polar molecules.

Question 16

From the point of view of valence electrons, explain the formation of diatomic gasses.

Accepted Answer

Pairs create a more

Question 17

Just as you crack an egg to begin making breakfast your friend walks into the room. "Look," she says, "I've cut my bangs and now they're crooked." As she pencils in a hair appointment on the calendar, her boyfriend comes in from outside, scraping clay from his boots. Jumping up on the counter, he knocks your glass mixing bowl to the floor, shattering it and making a slippery mess. You attempt to clean up the mess but accidentally break the metal handle off the dust pan and rip your new cotton shirt in the process. "What a morning!" you say. During which part of the morning were ionic bonds broken? When were metallic and covalent bonds broken?

Accepted Answer

When the egg cracked and the glass broke

Question 18

Why does carbon form a host of compounds and structures?

Accepted Answer

The four valence electrons in each carbo

Question 19

Chemical bonds are

Accepted Answer

A)  the attraction among atoms resulting from the destruction of electrons. 
B)  an unstable configuration among two or more elements. 
C)  the redistribution of electrons between atoms, leading to a more stable configuration. 
D)  sharing of electrons in the lowest energy level. 
E)  explained in laws of thermodynamics. 
A)  the attraction among atoms resulting from the destruction of electrons. 
B)  an unstable configuration among two or more elements. 
C)  the redistribution of electrons between atoms, leading to a more stable configuration. 
D)  sharing of electrons in the lowest energy level. 
E)  explained in laws of thermodynamics.

Question 20

Sodium chloride (NaCl) atoms form a crystal lattice that is held together by

Accepted Answer

A)  hydrogen bonds. 
B)  salt bonds. 
C)  covalent bonds. 
D)  ionic bonds. 
E)  van der Waals bonds. 
A)  hydrogen bonds. 
B)  salt bonds. 
C)  covalent bonds. 
D)  ionic bonds. 
E)  van der Waals bonds.

Exam 10: Atoms in Combination: the Chemical Bond: How Does Blood Clot

An example of a metallic bond is

Freezing and boiling are examples of

Explain the octane method of rating gasoline.

In which of the following places is more polymerization than depolymerization occurring?

A high octane rating in gasoline causes less engine 'knock' because

Describe the approach a chemist might take in designing polymers to have a shorter span of existence in a landfill.

Exothermic and endothermic chemical reactions differ in that

Your brother gives you two unfamiliar looking items and challenges you to discover which one is held together with metallic bonds and which one with ionic bonds. What test(s) would you design to meet his challenge?

What are isomers?

When hydrochloric acid and lye combine, what are the two chemical products?

If carbon were not available on Earth, what other element(s) have similar bonding potential.

What are polar molecules? Give an example.

Which statement is true of liquid crystals?

If you drop a material that is held together by ionic bonds, one likely outcome is that it will

Which of the following is not characteristic of hydrogen bonds?

From the point of view of valence electrons, explain the formation of diatomic gasses.

Why does carbon form a host of compounds and structures?

Chemical bonds are

Sodium chloride (NaCl) atoms form a crystal lattice that is held together by

Science: a Way of Knowing: How Do You Know What You Know

The Ordered Universe: Why Do Planets Appear to Wander Slowly Across the Sky

Energy: Why Must Animals Eat to Stay Alive

Heat and the Second Law of Thermodynamics: Why Is It Easier to Make an Omelet From an Egg Than to Make an Egg From an Omelet

Electricity and Magnetism: What Is Lightning

Waves and Electromagnetic Radiation: What Is Color

Albert Einstein and the Theory of Relativity: Can a Human Ever Travel Faster Than the Speed of Light, at Warp Speed

The Atom: Why Are There so Many Different Materials in the World

Quantum Mechanics: How Can the Electron Behave Like Both a Particle and a Wave

Materials and Their Properties: How Have Computers Gotten so Much Faster

The Nucleus of the Atom: How Do Scientists Determine the Age of the Oldest Human Fossils

The Ultimate Structure of Matter: How Can Antimatter Be Used to Probe the Human Brain

The Stars: How Much Longer Can the Sun Sustain Life on Earth

Cosmology: Will the Universe End

Earth and Other Planets: Is Earth the Only Planet With Life

Plate Tectonics: Can We Predict Destructive Earthquakes

Earths Many Cycles: Will We Ever Run Out of Fresh Water

Ecology, Ecosystems, and the Environment: Are Human Activities Affecting the Global Environment

Strategies of Life: What Is Life

The Living Cell: What Is the Smallest Living Thing

Molecules of Life: What Constitutes a Healthy Diet

Classical and Modern Genetics: Why Do Offspring Resemble Their Parents

The New Science of Life: Can We Cure Cancer

Evolution: How Did Life Emerge on the Ancient Earth

Filters