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Exam 2: The Nature of Molecules and the Properties of Water

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Question 21

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Cl + e^- $\rightarrow$ Cl^- is an example of a:

A) polymerization.
B) ionization.
C) reduction.
D) oxidation.

E) B) and D)
F) All of the above

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Question 22

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

A) electrical space.
B) energy level.
C) polar space.
D) orbital.

E) None of the above
F) A) and B)

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Question 23

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The sub-atomic particle with a positive charge is _____.

The amino acid glycine (C₃NO₂H₆) is a(an) :

All atoms tend to fill their outer energy levels with the maximum number of electrons, usually eight.Depending on whether atoms satisfy the octet rule will predict:

How is the bond in F₂ different from the bond in KCl?

How many hydrogen bonds can a water molecule form?

If water were non-polar it would not form hydrogen bonds.At normal room temperatures this non-polar water would be _____.

When two atoms share a pair of electrons, the bonding is referred to as:

Atoms in which the number of electrons does not equal the number of protons are known as:

Plants transport water to their leaves through the xylem when water evaporates from the leaves.The evaporating water pulls other water molecules up the xylem through ____ .

Which element's isotope is commonly used to determine when biological samples such as fossils, were formed?

The half-life of Carbon-14 is approximately 5,700 years.Using this information scientists have been able to determine the age of some artifacts left by humans.A scientist wants 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 22,800 years old, how much Carbon-14 originally existed in this piece of wood?

As you and a friend are entering a chemistry laboratory at your university, you see a sign that states: DANGER-RADIOACTIVE ISOTOPES IN USE.Your friend is an accounting major and has not had any science courses yet.She asks you what a radioactive isotope is and you respond correctly with:

When atoms gain or lose electrons, they become negatively or positively charged.These negatively or positively charged atoms are known as

Matter is composed of:

In the Hershey-Chase experiment, bacterial viruses, called phage, were used to demonstrate that DNA is the genetic material.The phage that were used for this experiment consisted of DNA surrounded by a protein coat.Phage will attach to specific types of bacteria and inject their DNA into the bacterial cell.To scientifically determine whether DNA is the genetic material, Hershey and Chase made phage in a medium containing radioactive sulfur-35 (S³⁵) .Why was S³⁵ used in this experiment?

The negative logarithm of the hydrogen ion concentration in the solution is referred to as:

Life is thought to have evolved from complex molecules formed by the interaction of smaller molecules in oceans and the atmosphere.The substance which brought these molecules together to interact is

Sugars dissolve well in water because of water's ______.