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

Two oxygen atoms joined to each other by the sharing of two pairs of electrons form a(n):

Proteins are three dimensional molecules made of strands of amino acids (imagine a ball of string).There are 20 different amino acids used in proteins found in living organisms.Some of these amino acids are polar and others are non-polar.Where would a series of non-polar amino acids most likely be located in a protein that is found in the cytosol of an animal cell?

The common basilisk lizard will run across water on its hind legs in an erect position when startled by predators.This lizard has large feet and flaps of skin along its toes.What properties of water allow this lizard to walk on water?

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

A scientist conducts a procedure that causes nitrogen atoms to gain neutrons.The resulting atoms will be:

Carbon has 4 valence electrons and oxygen has 6.Carbon dioxide would contain _____.

Sue was monitoring the oil spill into the Gulf of Mexico from an oil tanker.From her observations, she noted that the oil was moving as large patches in the water.It did not appear as though the oil was dissolving into the water.Why did the oil not dissolve into the water?

One mole of a substance contains 6.02 x 10²³ molecules.The atomic number of Li is 3 and the atomic mass is approximately 7.If you have three moles of Li, how many grams does it weigh?

Sodium has 11 electrons arranged in three energy levels.In order to become stable, sodium forms an ion with:

Carbon-12, Carbon-13 and Carbon-14 are examples of:

You recently discovered a new element, and find that this particular element has one electron its outer energy level.What would you expect will happen to an atom of this element if placed in water?

Mendeleev found that when he arranged the known elements according to their atomic mass, the entries in the table exhibited a pattern of chemical properties that repeated itself in groups of eight elements.This led to the generalization now known as:

Isotopes that are unstable and decay when their nucleus breaks up into elements with lower atomic numbers, emitting significant amounts of energy in the process, are called:

The electronegativity of nitrogen (N) is 3.0, while the electronegativity of hydrogen (H) is 2.1.Knowing this, consider how the electrons will be shared in ammonia (NH₃).What do you predict about the polarity of ammonia?

Oxygen has an atomic mass of 16 and an atomic number of 8.How many neutrons are present?

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?

Magnesium chloride is a salt formed with ionic bonds between one magnesium ion and two chloride ions.Magnesium has two electrons in its outer shell and chlorine has seven electrons in its outer shell.How are the electrons transferred between these atoms?

Regardless of its shape, a given orbital may contain no more than:

According to most car mechanics, plain water is the best coolant to use in an engine provided the engine is not being exposed to freezing temperatures.If the car is subject to freezing temperatures then a mixture of water and ethylene glycol (antifreeze) is recommended but it does not cool as efficiently as plain water.Why would ethylene glycol reduce the cooling efficiency of water?

Organisms are composed of molecules, which are collections of smaller units, termed: