Name
BIOLOGY– Inorganic Chemistry
Multiple Choice
Class Date
Write the letter that best answers the question or completes the statement on the line provided.
_____ 1.
The three particles that make up atoms are a.
protons, neutrons, and isotopes. c.
positives, negatives, and neutrals. b.
neutrons, isotopes, and electrons. d.
protons, neutrons, and electrons.
_____ 2.
What are found in the space surrounding the nucleus of an atom? a.
protons b.
electrons c.
d.
neutrons
ions
_____ 4.
In a water molecule, shared electrons spend more time around the oxygen atom than the hydrogen atoms. As a result, the oxygen atom is a.
slightly negative.
b.
very negative. c.
d.
slightly positive.
very positive.
_____ 5.
When sugar is dissolved in water, water is the a.
reactant. c.
solute. b.
solution. d.
solvent .
_____ 6.
A map of eastern North America, showing the pH of rainfall in the various states, indicates that the pH of rain in New York State varies from 4.22 to 4.40. According to these figures, the most acidic rainfall in New York State has a pH of a .
4.22.
b.
4.30. c.
4.35. d.
4.40.
_____ 7.
Which of the following makes up a molecule of water? a.
one atom of hydrogen and one atom of oxygen b.
one atom of sodium and one atom of chlorine c.
one atom of hydrogen and two atoms of oxygen d .
two atoms of hydrogen and one atom of oxygen

Name
_____ 8.
A substance with a pH of 6 is called a .
an acid.
c.
water. b.
a base. d.
a suspension.
_____ 9.
Solutions that have OH
–
> H
+
ions are a.
reactants. c.
bases.
b.
acids. d.
enzymes.
Class Date
_____ 10.
Why is carbon so special compared to other elements? a. Carbon atoms can bond to one another and form a lot of different structures.
b.
c.
d.
Carbon atoms can form quadruple bonds.
Only carbon atoms can form covalent bonds with oxygen and hydrogen.
Only carbon atoms can be dissolved in water solutions and suspensions.
COMPLETION: Use the word bank below to answer completion questions 11-16
Hydrogen bonds Capillary Action
Cohesion Protons
Electrons
Adhesion
11 . Of the three subatomic particles, protons have a positive charge and are found in the nucleus.
12.
A water molecule is polar because there is an uneven distribution of electrons between the oxygen and the hydrogen atoms.
13.
Fish and other aquatic organisms survive warm summer months because __ Hydrogen bonds _________ must be broken before the water will heat up.
14.
A water strider can move across the surface of water because of __ Cohesion (also called surface tension sometimes) _________ , or water molecules sticking to themselves.
15.
___ Capillary Action______ is a property of water that helps plants and trees get water from their roots up to their leaves.
16.
Water molecules sticking to the surface of a desk or your skin is an example of _ adhesion __, a unique property of water.

pH Scale – Use the scale to answer the following questions
17. According to the scale, what substance is neutral? ____ Pure water_____________
18. Compare the H
+
ion concentrations of pure water and sea water , using the pH scale above.
_____________ Pure water has more H+ ions that sea water because it is more toward the acidic side of the scale were more H+ is found.
19. Which substance produces the most OH- ions? ____ Bleach _____________________
20. What is the strongest acid listed in the pH scale above __ Stomach Acid ____________
21. Is human blood an acid or a base? ___ Slightly basic ________________________

+
-
+
Covalent bond (shared electrons) between hydrogen and oxygen of the same water molecule
Bond between hydrogen and oxygen of two different water molecules is an H or Hydrogen bond
-
+
24. List two properties of water and explain how at least one of the two you have listed benefits a living thing.
_____ High specific heat – keeps acquatic organisms from heating up too much
Decreased density and expansion; when frozen – insulates acquatic organisms
Adhesion/Cohesion – capillary action so trees can get water to stems and leaves.
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