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| 1 | |
The smallest particle of an element that has the chemical characteristics of that element is a (n) |
| | A) | atom. |
| | B) | proton. |
| | C) | neutron. |
| | D) | electron. |
| | E) | molecule. |
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| 2 | |
The atomic number of an element is equal to the number of |
| | A) | protons in each atom. |
| | B) | electrons in each atom. |
| | C) | neutrons in each atom. |
| | D) | both a and b |
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| 3 | |
Most of the volume of an atom is occupied by |
| | A) | electrons. |
| | B) | neutrons. |
| | C) | protons. |
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| 4 | |
The chemical behavior of an atom is determined largely by |
| | A) | its number of protons. |
| | B) | its outermost electrons. |
| | C) | the size of the electron cloud. |
| | D) | its mass. |
| | E) | its weight. |
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| 5 | |
The symbol Na+ indicates that a sodium atom has |
| | A) | gained an electron. |
| | B) | gained a proton. |
| | C) | gained a neutron. |
| | D) | lost an electron. |
| | E) | lost a proton. |
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| 6 | |
When Na+ and Cl- are attracted to each other, a(n) _______ bond is formed. |
| | A) | covalent |
| | B) | hydrogen |
| | C) | ionic |
| | D) | polar covalent |
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| 7 | |
The weak attraction between two water molecules is called a(n) |
| | A) | covalent bond. |
| | B) | hydrogen bond. |
| | C) | electrical bond. |
| | D) | ionic bond. |
| | E) | polar covalent bond. |
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| 8 | |
Which of these is a NOT a compound? |
| | A) | H20 |
| | B) | H2 |
| | C) | NaCl |
| | D) | NO2 |
| | E) | C6H12O6 |
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| 9 | |
When two or more reactants combine to form a larger, more complex product, the process is called a(n) |
| | A) | decomposition reaction. |
| | B) | synthesis reaction. |
| | C) | exchange reaction. |
| | D) | reversible reaction. |
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| 10 | |
In which of these types of reactions does an equilibrium occur? |
| | A) | decomposition reaction |
| | B) | synthesis reaction |
| | C) | exchange reaction |
| | D) | reversible reaction |
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| 11 | |
If the number of hydrogen ions in a solution is increased, the |
| | A) | solution becomes more acidic. |
| | B) | solution becomes more alkaline (basic). |
| | C) | pH of the solution will be increased. |
| | D) | solution is a buffer. |
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| 12 | |
Which of these is NOT an important characteristic of water for living organisms? |
| | A) | produces CO2 in the body |
| | B) | cushions and lubricates |
| | C) | dissolves molecules to allow chemical reactions |
| | D) | transports molecules |
| | E) | stabilizes body temperature |
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| 13 | |
Which of these is a monosaccharide? |
| | A) | sucrose |
| | B) | starch |
| | C) | glycogen |
| | D) | glucose |
| | E) | cellulose |
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| 14 | |
The building blocks for proteins are |
| | A) | amino acids. |
| | B) | fatty acids and glycerol. |
| | C) | monosaccharides. |
| | D) | disaccharides. |
| | E) | nucleic acids. |
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| 15 | |
Enzymes |
| | A) | are always composed of monosaccharides. |
| | B) | function by lowering the activation energy for a reaction. |
| | C) | can control many different reactions. |
| | D) | generally decrease the rate of chemical reactions. |
| | E) | are destroyed during the reaction they catalyze. |
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| 16 | |
Four elements compose about 96% of the weight of the body. Which of these elements is NOT part of those four? |
| | A) | carbon |
| | B) | nitrogen |
| | C) | phosphorus |
| | D) | oxygen |
| | E) | hydrogen |
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| 17 | |
Energy is defined as |
| | A) | the simplest type of matter with unique chemical properties. |
| | B) | anything that occupies space and has mass. |
| | C) | the amount of matter in an object. |
| | D) | the capacity to do work. |
| | E) | the smallest particle of an element that has the chemical characteristics of that element. |
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| 18 | |
The rate of a chemical reaction can be influenced by all of the following EXCEPT: |
| | A) | catalysts |
| | B) | temperature |
| | C) | reactants |
| | D) | concentration |
| | E) | products |
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| 19 | |
An acidic solution |
| | A) | has an equal number of H+ and OH-. |
| | B) | has a greater number of H+ than OH-. |
| | C) | has a greater number of OH- than H+. |
| | D) | has a pH of 7.0. |
| | E) | has a pH greater than 7.0. |
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| 20 | |
The four major groups of organic molecules essential to living organisms are: |
| | A) | adenosine triphosphates, proteins, carbohydrates, and lipids. |
| | B) | adenosine triphosphates, carbohydrates, lipids, and nucleic acids. |
| | C) | adenosine triphosphates, proteins, lipids, and nucleic acids. |
| | D) | proteins, carbohydrates, lipids, and nucleic acids. |
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