Exam 2: The Chemical Level of Organization

When a small amount of HCl or NaOH is added to a solution of Na₂HPO₄,the pH of the solution barely changes.Based on these observations,all of the following are true concerning the compound Na₂HPO₄,except

Each of the following is an inorganic compound except

Which of the following descriptors is false regarding enzymes?

The "atomic weight" of an atom reflects the average number of

The average time between synthesis and breakdown is known as the ________ time.

If a pair of electrons is unequally shared between two atoms,a(n)________ bond occurs.

An example of an organic substance is

In dehydration synthesis reactions,compounds

Carbohydrate molecules

Oppositely charged ions in solution are prevented from combining by

What role do buffer systems play in the human body?

Identify the correct statement regarding the process of denaturation.

If an element is composed of atoms with an atomic number of 6 and a mass number of 14,then a non-isotopic atom of this element contains

Magnesium atoms have two electrons in the outermost shell and chlorine atoms have seven.The compound magnesium chloride would contain

The ________ of a radioactive substance is the time required for 50 percent of a given amount of radioisotope to decay.

Chemical reactions that occur in the body are accelerated by

A(n)________ bond is a covalent bond that stores an unusually large amount of energy.

The ________ of a solution is the negative logarithm of the hydrogen ion concentration expressed in moles per liter.

Blood has a very narrow normal pH range but urine has a very broad normal pH range.What does that indicate about the physiology of pH?

Helium (He)has an atomic number of 2.It is chemically stable because it