Exam 2: Chemical Basis of Life

The number of protons in the atoms of a particular element is called the element's atomic ________.

Protons are located in the _________ of an atom and they have a "charge" that is ________.

A pH value indicates the hydrogen ion concentration in solutions,including body fluids.

When two or more atoms bond,they form a new kind of particle called a molecule.

The building blocks of fat molecules are amino acids.

When atoms combine with other atoms,interactions occur between their ________ shells.

If the bonds of a reactant molecule break so that simpler molecules,atoms or ions form,the reaction is an exchange reaction.

The different types of carbohydrates do NOT include

The number of protons plus the number of ________ is approximately equal to the atomic weight.

Protons and electrons are similar in size.

________ are chemicals that resist changes in pH.

The building blocks of proteins are amino acids.

The atoms of the isotopes of a particular element vary in the number of

Many inorganic substances dissociate in water to release ions.

Which of the following is the number of elements living organisms require?

Which term describes a solution that contains more hydroxide ions than hydrogen ions?

The type of chemical bond formed when atoms share electrons is called ________.

Carbon,oxygen,sodium and hydrogen compose over 95% (by weight)of the human body.

The formula H₂O means

Of the three common forms of radiation,_______ radiation is most penetrating and similar to X-rays.