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Essentials Of Biology Chapter 2--Part 2

Test Description: Part 2 of 2

Instructions: Answer all questions to get your test result.

1) Human body cells are approximately ______ water.

A25-35% B50-55% C70-95% D90-95%

2) The tendency of molecules of the same kind to stick together is called ______.

Acohesion Bbonding Cadhesion Dpolarity

3) Why (if you are careful) are you able to float a needle on the surface of water?

AThe surface tension that is a result of water's cohesive properties makes this possible. BThe covalent bonds that hold a water molecule together are responsible for this ability CA single needle is less dense than water. DWater has adhesive properties.

4) Sweating cools your body by ______.

Acohesion Bhydrogen bonding Cevaporative cooling Dradiation

5) As water freezes, ______.

Aits molecules move farther apart Bit loses its polarity Cit cools the surrounding environment Dits hydrogen bonds break apart

6) Sugar dissolves when stirred into water. The sugar is the , the water is the , and the sweetened water is the __.

Asolution... solvent... solute Bsolvent... solute... solution Csolution... solute... solvent Dsolute... solvent... solution

7) A base ____________.

Aremoves H2O molecules from a solution Bremoves H+ ions from a solution Cdecreases the pH of a solution Dremoves OH- ions from a solution

8) The lower the pH of a solution, the ______.

Amore acidic the solution Bless toxic the solution Cgreater the number of oxygen atoms Dhigher the OH— concentration

9) What name is given to substances that resist changes in pH?

Asugars Bsalts Cbases Dbuffers

10) Household bleach _______________ than household ammonia .

Ais more acidic Bhas a lower H+ concentration Chas 100 times higher H+ concentration Dhas a higher H+ concentration

11) If the brain is not properly hydrated, ___________________.

Aall of these Blong-term memory recall is reduced Cshort-term memory is reduced Dyou may get headaches

12) People who exercise regularly ___________________.

Acan learn faster than couch potatoes Bcan increase their IQ scores Call of these Dreact to stress better

*select an answer for all questions

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