The Structure of Life Essay

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Question1
Marks: 1
What determines the atomic number of an atom?
Choose one answer.
| a. number of protons in the atomic nucleus | |
| b. arrangement of neutrons in the atomic nucleus | |
| c. the total number of electrons and neutrons | |
| d. total number of energy shells | |
| e. number of electrons in the outermost energy level | |
Question2
Marks: 1
Sweating is a useful cooling device for humans because
Choose one answer.
| a. water takes up a great deal of heat in changing from its solid state to its liquid state. | |
| b. water can exist in three states at temperatures common on Earth. | |
| c. water ionizes readily. | |
| d. water takes up a great deal of heat in changing from its liquid state to its gaseous state. | |
| e. water is an outstanding solvent. | |
Question3
Marks: 1
Sodium (Na) , atomic number 11, has a tendency to lose an electron in the presence of chlorine. After losing the electron, Na will have ___ protons in its nucleus.
Choose one answer.
| a. 11 | |
| b. 22 | |
| c. 12 | |
| d. 21 | |
| e. 10 | |
Question4
Marks: 1
A substance with specific properties that cannot be broken down or converted to another substance is a(n)
Choose one answer.
| a. Compound | |
| b. Ion | |
| c. Molecule | |
| d. Element | |
| e. Mixture | |
Question5
Marks: 1
Polar covalent bonds form when
Choose one answer.
| a. an acid and base are combined. | |
| b. atoms from two molecules are attracted to each other. | |
| c. electrons are shared unequally between atoms. | |
| d. more than one pair of electrons is shared. | |
| e. ions are formed. | |
Question6
Marks: 1
Hydrophilic molecules
Choose one answer.
| a. form hydrogen bonds among themselves. | |
| b. are neutral and nonpolar. | |
| c. readily dissolve in water. | |
| d. A and C | |
| e. A, B, and C |...

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The Structure of Life. Anti Essays. Retrieved November 23, 2014, from the World Wide Web: http://www.antiessays.com/free-essays/The-Structure-Of-Life-501263.html