Chapter 2 Test: Chemistry of Life
1. Atoms are
a. Living
b. Not living
c. Dead
2. All living and nonliving objects are made of _______________.
a. Atoms
b. Cells
c. Both atoms and cells
3. The identity of an atom is determined by the number of ____________.
a. Protons
b. Neutrons
c. Electrons
4. Protons have a _____________ charge
a. Positive
b. Negative
c. Neutral
5. Electrons have a ___________ charge
a. Positive
b. Negative
c. Neutral
6. A/an ________________ is made of many atoms of the same type.
a. Atom
b. Compound
c. Element
7. CO is a/an ___________________.
a. Atom
b. Compound
c. Element
8. When an atom loses an electron it becomes a ________________ ion.
a. Negative
b. Neutral
c. Positive
9. Which is the strongest type of bond that holds atoms together to make molecules?
a. Covalent
b. Ionic
TEST A
c. James
10. What type of bond is formed when Na+ and Cl- are attracted to each other?
a. Covalent
b. Ionic
c. James
11. A substance with a pH greater than 7 up to 14 is a/an _________.
a. Acid
b. Base
c. Neither
12. OH- are called ____________ and are released by ______________.
a. Hydrogen ions, acids
b. Hydrogen ions, bases
c. Hydroxide ions, acids
d. Hydroxide ions, bases
13. If you were to test the pH of an orange, what would you expect the pH to be?
a. pH 2
b. pH 7
c. pH 9
14. If you were to test the pH of an antacid tablet like Tums, what would you expect the pH to be?
a. pH 2
b. pH 7
c. pH 9
15. A substance that has a pH of 6.999 is a _________________.
a. Strong acid
b. Weak acid
c. Neutral
d. Strong base
16. Which of the following is pH 7.001?
a. Weak Acid
b. Weak Base
c. Neutral
17. What is H₂SO₄ ?
a. Acid
b. Base
c. Neither
18. A map of the rain’s pH that falls on different Pennsylvania cities varies from 4.22 to 4.40. The most
acidic rainfall in the state of Pennsylvania has a pH of _____________.
a. 4.00
b. 4.22
c. 4.35
d. 4.40
19. Which of the following is an acid
a. NaCl
b. NaOH
c. HCl
d. C₆ H₁₂ O₆
20. Which of the following is a base?
a. NaCl
b. NaOH
c. HCl
d. C₆ H₁₂ O₆
21. The presence of what atom determines if a molecule is organic or inorganic?
a. Hydrogen
b. Oxygen
c. Carbon
22. Which of the following is an organic compound?
a. NaCl
b. H₂ O
c. O₂
d. CH₄
23. Which is not one of the 4 major groups of organic compounds in living things?
a. Carbohydrates
b. Enzymes
c. Nucleic Acids
d. Proteins
24. In chemical reactions, atoms are __________________.
a. Created
b. Destroyed
c. Rearranged
25. All chemical reactions need _____________ to occur.
a. Chemical bonds
b. Energy
c. Heat
26. What is the energy that is needed to get a reaction started?
a. Chemical energy
b. Activation energy
c. Bond energy
27. What are the reactant(s) in the chemical reaction, CO₂ + H₂O  H₂CO₃ .
a. CO₂ , H₂O, and H₂CO₃
b. CO₂ and H₂O
c. H₂CO₃
28. When hydrogen and oxygen combine to form water, water is a _______________.
a. Reactant
b. Product
c. Both a product and reactant
29. Enzymes work to ___________ chemical reactions.
a. Give energy
b. Speed up
c. Slow down
30. Enzymes are a type of _______________.
a. Carbohydrate
b. Lipid
c. Protein
31. Enzymes have __________ where _____________ attach.
a. substrates, active e sites
b. Active sites, substrates
c. Catalyst, substrates
32. True or False: Each enzyme can only bind to one type of molecule.
a. True
b. False
33. True or False: Enzymes are reusable.
a. True
b. False
Matching
Match the organic compound group to its function. Each one may be used more than once.
34. Source of “quick energy”
a. Carbohydrates
35. Includes enzymes
b. Lipids
36. Genetic material
c. Nucleic Acids
37. Provides warmth and insulation
d. Proteins
38. Examples are DNA and RNA
39. Also known as sugars and starches
40. Includes the fats, waxes and oils
41. Molecules in this groups usually end in –ose
Match the organic compound groups to its monomers
42. Monosaccharides
a. Carbohydrates
43. Nucleotides
b. Lipids
44. Glycerol and fatty acids
c. Nucleic Acids
45. Amino Acids
d. Proteins
Match the name of the molecule and its special job
46. Sugar made in photosynthesis
a. Cellulose
47. Builds plant cell walls
b. Chitin
48. Carries oxygen in the blood
c. Glucose
49. Digests milk sugar
d. Lactase
50. Used to build fungi cell walls and insect shells
e. Hemoglobin
TEST A
Name _______________________________________ Period _____________
Short Answer
Explain why the study of chemistry needs to be included when studying about living things in biology
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Use the chemical formula 2CH₄ to answer the following questions.
1. Is this an element or compound? __________________
2. Explain your answer for #1
___________________________________________________________________________
3. How many molecules are in this formula? ___________
4. How many atoms of each element are present in one molecule? _________________
Elemental Symbol
Name of Element
Number of atoms in one molecule
___________
______________
____________
___________
______________
____________
4. Using a ball (atoms) and stick (bonds) figure draw 2 CH₄.
- Carbon
- Hydrogen