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1Q-If an atom contains 3 protons, 4 neutrons, and 3 electrons, its mass number is ?
a. 3
b. 4 
c. 7 
d. 11

2Q-if an atom contains 11 protons and 12 neutrons, its atomic number is ?
a. 1 
b. 11
c. 12
d. 23

3Q-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

4Q-a covalent bond is formed as a result of ? 
a. transferring electrons 
b. sharing electrons 
c. transferring protons 
d. sharing protons

5Q-water molecules are polar with the ? 
a. oxygen side being slightly positive and the hydrogen side being slightly negative 
b. oxygen and hydrogen sides being slightly positive 
c. oxygen and hydrogen sides being slightly negative 
d. oxygen side being slightly negative and the hydrogen side being slightly positive

6Q-if you stir salt into boiling water, you produce a ? 
a. mixture called a suspension 
b. mixture called a solution 
c. solution and suspension 
d. mixture only

7Q-a substance with a pH of 6 is called ?
a. an acid 
b. a base
c. water
d. a suspension

8Q-solutions that have more OH- than H+ ions are ?
a. reactants 
b. acids
c. bases 
d. enzymes

9Q-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. carbon atoms can form quadruple bonds 
c. only carbon atoms can form covalent bonds with oxygen and hydrogen 
d. only carbon atoms can be dissolved in water solutions and suspensions

10Q-carbon-12 is the most common isotope of carbon. it has 6 protons, 6 neutrons, and 6 electrons. of its 6 electrons, 4 are valence electrons. how many covalent bonds can a carbon atom form?
a. 1
b. 4
c. 6
d. 12

11Q-amino acid is to protein as ?
a. fat is to lipid 
b. sugar is to fat 
c. DNA is to RNA 
d. simple sugar is to starch

12Q-in chemical reactions, atoms are ?
a. created
b. destroyed
c. rearranged 
d. neutralized

13Q-when hydrogen and oxygen combine to form water, water is ?
a. a product 
b. a reactant 
c. an enzyme 
d. a catalyst

14Q-which of the following statements about enzymes is NOT true? 
a. enzymes work best at a specified pH
b. all enzymes have the same shape as their substrates 
c. enzymes are proteins 
d. the shape of an enzyme allows it to do its job

15Q-of the three subatomic particles, _____________ are most involved in forming chemical bonds.

16Q-a water molecule is polar because there is an uneven distribution of __________ between the oxygen and the hydrogen atoms.

17Q-complex carbohydrates are to monosaccharides as polymers are to ____________.

18Q-the elements or compounds that go into a chemical reaction are __________.

19Q-the energy needed to start a chemical reactions is called the _________ _______.

20Q-when working in the laboratory, you discover that the solutions you are working with are tomato juice with a pH of 4 and soap with the pH of 10. By comparing the pH of these substances with that of pure water, would you find that each of these substances is acidic or basic? Explain.


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1Q-If an atom contains 3 protons, 4 neutrons, and 3 electrons, its mass number is ? a. 3 b. 4 c. 7 d. 11 1A-c. 7

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