Name ______________________
Chapter Two Test
Chemistry
____1. If an atom contains 11 protons and 12 neutrons, its atomic number is
A. 1
C. 12
B. 11
D. 23
____2. The nucleus is made up of all of the following:
A. Electrons
C. Protons
B. Neutrons
D. Protons, neutrons, and electrons
____3. A covalent bond is formed as the result of
A. Transferring electrons
C. Transferring protons
B. Sharing an electron pair
D. Sharing a proton pair
____4. Ice floats on water because
A. Of cohesion
B. Ice has a lower density then water
C. Water shrinks when it freezes
D. Water expands when it freezes
____5. The most abundant compound in most living things is
A. Water
C. Sodium chloride
B. Carbon dioxide
D. Sugar
____6. Which of the following is a use of radioactive isotopes?
A. Can determine the ages of rocks and fossils
B. Can be used to treat cancer and kill bacteria that cause food to spoil
C. Can be used in water
D. None of the above
____7. When hydrogen and oxygen combine to form water, water is
A. A product
C. Both a product and a reactant
B. A reactant
D. Neither a product nor a reactant
____8. Identify the reactant(s) in the chemical reaction CO2 + H2O → H2CO3
A. CO2, H2O, and H2CO3
C. H2CO3
B. H2O
D. CO2
____9. Enzymes affect the reactions in living cells by changing the
A. Products of the reaction
C. Temperature of the reaction
B. Speed of the reaction
D. pH of the reaction
____10. The curved meniscus of the water in a graduated cylinder is due to
A. Capillary action
C. Adhesion
B. Density
D. Cohesion
____11. When a solution is basic, the pH is
A. Less than 3
B. Less than 7
C. Greater than 7
D. 7
____12. An organic compound always contains
A. Carbon
B. Helium
C. Oxygen
D. Nitrogen
____13. When atoms combine to form a compound, their outer energy levels lose or gain
A. Electrons
C. Protons
B. Neutrons
D. Ions
___14. Which of the following are examples of chemical properties?
A. Freezing
C. Digesting
B. Changing clothes
D. Rotting
____15. Which of the following are compounds?
A. Gold
B. Water
C. Carbon dioxide
D. Oxygen gas
____16. Fats, oils, waxes, and steroids are all
A. Lipids
B. Carbohydrates
C. Protein
D. Human energy source
____17. Polysaccharides are giant polymers consisting of thousands of linked
A. Monosaccharides
C. Fat molecules
B. Nucleic acids
D. Proteins
____18. The process when a water is lost when two molecules are bonded is called:
A. An inorganic compound
C. Polymerization
B. Hydrolysis
D. Dehydration synthesis
____19. The smallest particle of an element is a(n)
A. Compound
C. Molecule
B. Atom
D. Nucleus
____20. Which of the following are examples of solutions?
A. Salt water
C. Water
B. B. Salt
D. Sugar water
____21. When 2 glucose molecules are joined by dehydration synthesis, how many water molecules
are formed?
A. 1
C. 3
B. 2
D. 4
____22. Sugar is dissolved in water. What is the solvent?
A. Sugar
C. Neither
B. Water
____23. Which of the following is a mixture?
A. CaCO
B. Mg
C. Potting soil
D. Oxygen
____24. Which of the following particles make up an atom?
A. Isotopes
C. Neutrons
B. Electrons
D. Positives
____25. Chemical reactions that release energy are
A. Endothermic
C. Products
B. Enzymes
D. Exothermic
____26. Which of the following are physical changes?
A. Ice melting
C. Rusting
B. Rotting
D. Tearing
____ 27. Electrons that are available to form bonds are
A. Valence electrons
C. Covalent
B. Ionic
D. Isotope
____ 28. An uneven sharing of electrons between the oxygen and hydrogen atoms of water
A. Hydrogen bonds
C. Chemical Change
B. Polarity
D. Covalent bond
____ 29. In the formula 2H2O, how many total atoms of hydrogen are there?
A. Two
C. Four
B. 0
D. One
____30 When there are an equal number of hydrogen atoms (H) and hydroxide atoms (OH) in a
solution, the solution will be
A. Acidic
C. Neutral
B. Basic
D. Negative
____31. Which of the following are macromolecules?
A. Elements
C. Proteins
B. Nitrogen
D. Lipids
____ 32. The figure above shows amino acids linked together. What forms when amino acids are
linked together?
A. Lipids
C. Protein
B. Carbohydrate
D. Nucleic Acid
Match the following phrase to the correct answer. Answers can be used more than once.
____33. Not soluble in water
A. Carbohydrates
____34. Glucose
B. Lipids
____35. Genetic material, DNA and RNA
C. Monosaccharide
____36. Has an amino group, carboxyl group,
and R group
D. Nucleic Acids
E. Cellulose
____37. Main source of energy
F. Proteins
____38. Consists of a sugar, phosphate, and
nitrogen base
____39. Monosaccharides, disaccharides,
polysaccharides
____40. Composed of C, H, N, O atoms
____ 41. Tough fibers that give plants much of their
strength and rigidity
____ 42. Stores energy, waterproof coverings
G. Nucleotide
Use the table below to answer questions 43 – 47
Substance
Toothpaste
Vinegar
Blood
Eggs
Liquid drain cleaner
pH
9.9
2
7.4
8
14
43. What is the strongest base listed in the table? ____________________________________
44. What is the pH of the strongest base listed in the table? ____________________________
45. According to the table, is blood a base or an acid? _________________________________
46. True or False. Vinegar has more H ions than it has OH ions. _________________________
47. A change in one unit on the pH scale represents a tenfold increase in the concentration of
hydrogen ions. According to the pH values listed in the table, how much greater is the hydrogen
ion concentration in vinegar than in eggs? ________________________________________
48. Fill in the missing data in the chart below.
Element
Symbol
Protons
Neutrons
Helium
Oxygen
Neon
Potassium
Aluminum
He
O
Ne
K
Al
Electrons
2
Atomic
Number
2
Mass
Number
8
10
19
20
19
14
49. Correctly put the electrons of aluminum in the energy levels of the electron cloud.
50. Draw the correct structure of the water molecule.
Using the graph below answer the questions 51 and 52.
____ 51. What is amylase in the figure above?
A. Enzyme
C. Lipid
B. Protein
D. Nucleic Acid
52. Using the graph above, how does amylase change the rate of the reaction?
Please write the letter of the correct definition for each term below:
______53. Activation Energy
A. Protein that acts as a biological catalyst.
______54. Catalyst
B. Reactant of an enzyme-catalyzed reaction.
______55. Enzyme
C. Substance that speeds up the rate of a chemical reaction.
______56. Substrate
D. Weak acid or base that can react with strong acids or bases
to help prevent sharp, sudden changes in pH.
______57. Suspension
E. Energy needed to get a reaction started.
______58. Buffer
F. Mixture of water and nondissolved materials.