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Exam 2: The Nature of Molecules

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Question 31

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Capillary action is one of the forces that aids water's upward movement in plants.The more narrow the diameter of the tube,the farther the water column will rise.Capillary action is a result of water molecules

A) storing heat and thus moving faster because of heat of vaporization.
B) producing sufficient surface tension to overcome the pull of gravity.
C) having a strong cohesive force and attaching to the surrounding vessel walls.
D) having an adhesive force,which allows them to attach to the vessel walls.
E) being associated with hydrophobic molecules,which can result in upward movement.

F) C) and D)
G) B) and D)

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Question 32

Multiple Choice

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Which of the following elements' isotopic ratios are used to make absolute determinations of the time of formation of materials?

A) oxygen
B) hydrogen
C) carbon
D) nitrogen
E) radon

F) A) and B)
G) C) and D)

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Question 33

Multiple Choice

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In the crystal matrix of ordinary salt,the sodium and chlorine are held together by

The electronic configuration of the noble gas Neon,which has an atomic number of 10,can be written as follows: 1s²2s²2p⁶.What is the electronic configuration of the noble gas Argon,which has an atomic number of 18?

Water is extremely important in living things for all of the following reasons except

The atomic number of an element is equal to the number of

Which of the following is not one of the four most abundant (more than 99%) atoms found in living things?

Negatively charged particles of atoms with almost no mass are called

Water is most dense and thus heavier at 4 degrees Centigrade.At zero degrees Centigrade ice forms and can float on liquid water.Suppose ice were most dense at zero degrees Centigrade.Select the best explanation of what would happen in aquatic systems.

Based on information provided,which of the following best describes sulfer-35?

Oxygen ordinarily has 8 protons and 8 neutrons.Another rare form has two extra neutrons.These two forms are

On the first day of organic chemistry class the person sitting next to you exclaims that he is excited about the class because he is very interested in organic farming practices.You tell him that in the context of this class,organic refers to

Atoms are composed of electrons and a dense nucleus which contains protons and _____________.

The area around a nucleus where an electron is most likely to be found is called

After years of hard work in the laboratory,you have identified an enzyme involved in a cellular reaction.How does the enzyme affect both the reaction equilibrium between reactants and products and the time needed to reach equilibrium?

Your friend is having a little difficulty understanding the nature of covalent bonding,especially single bonds,double bonds,and triple bonds.He thinks that you can explain the difference.What answer would be correct?

Compared with a pH of 7,a solution of pH 5 has

Consider the following electronegativity values: Boron (B) = 1.8 Carbon (C) = 2.5 Chlorine (Cl) = 3.2 Selenium (Se) = 2.6 Which of the following bonds is the most polar?

The half-life of Carbon-14 is approximately 5,600 years.Using this information scientists have been able to determine the age of some artifacts left by humans.Suppose that a scientist wanted to know approximately how old a piece of wood was that she found on the floor in an old cave that had recently been discovered.She removed the wood (with permission) to her laboratory.Her wood sample contained 2 grams of Carbon-14.If the age of the wood was determined to be 22,400 years old,how much Carbon-14 originally existed in this piece of wood?

Smallest particle in the atom.