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Exam 2: Chemical Basis of Life

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Question 31

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

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Question 32

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Protons and electrons are similar in size.

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B) False

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Question 33

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

Many inorganic substances dissociate in water to release ions.

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

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

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

The different types of carbohydrates do NOT include

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

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

The building blocks of fat molecules are amino acids.

The formula H₂O means

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

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

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

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

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

________ are chemicals that resist changes in pH.

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

The building blocks of proteins are amino acids.