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

The pH of your small intestines is around 7.5 and the pH of your large intestine can be 5.5.As substances travel from the small intestines to the large intestine,what would happen to the H⁺ ion concentration?

Oxygen-16 is abundant and has 8 protons and 8 neutrons.Oxygen-18 has two extra neutrons.These two forms are:

To increase the rate of a reaction you could:

Matter is composed of:

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

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

Salt is often used to melt ice on roads during the winter because it lowers the freezing/melting point of water.When salt dissolves in water,individual Na⁺ and Cl^- ions break away from the salt lattice and become surrounded by water molecules.Why would this cause ice to melt?

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

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?

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

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

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

Water molecules are polar with ends that exhibit partial positive and negative charges.These opposite charges allow water molecules to attract each other through:

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:

An atom has 20 electrons and 20 neutrons.What is the mass of this atom?

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

Because oxygen is more electronegative than hydrogen,the water molecule is:

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?

An atom that is negatively charged because it has accepted an electron is a(n):

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?