Preparatory Chemistry
Solved Exam Questions
Course Introduction
Preparatory Chemistry is designed to provide students with a solid foundation in the fundamental concepts of chemistry, serving as an essential stepping stone for more advanced studies in the subject. This course covers topics including atomic structure, chemical bonding, the periodic table, stoichiometry, chemical reactions, properties of gases, solutions, and basic thermochemistry. Emphasis is placed on problem-solving skills, mathematical applications in chemistry, and the development of laboratory techniques. By the end of the course, students will be equipped with the knowledge and confidence necessary to succeed in General Chemistry and related scientific courses.
Recommended Textbook
Introductory Chemistry 5th Edition by Nivaldo J. Tro
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19 Chapters
2146 Verified Questions
2146 Flashcards
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Chapter 1: The Chemical World
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Sample Questions
Q1) Quantification involves measurement as part of an observation.
A)True
B)False
Answer: True
Q2) Antoine Lavoisier proposed the atomic theory.
A)True
B)False Answer: False
Q3) The atomic theory explains why the law of conservation of mass is true.
A)True
B)False
Answer: True
Q4) Which of the following statements about soda pop is FALSE?
A)Soda pop is a chemical mixture of mostly sugar,water and carbon dioxide.
B)The molecules important to fizzing are carbon dioxide and water.
C)The carbon dioxide is forced to mix with the water by the presence of sugars.
D)When a can is opened,the pressure release allows carbon dioxide to form bubbles.
E)All of the above statements are true.
Answer: C
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Chapter 2: Measurement and Problem Solving
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Sample Questions
Q1) The common English unit in which the speed of an automobile is expressed is miles/hr.What is the set of base SI units for speed?
A)mile/s
B)km/hr
C)km/s
D)m/s
E)none of the above
Answer: D
Q2) You do not need to write units in calculations as long as you can remember them.
A)True
B)False
Answer: False
Q3) Which of the following would NOT be considered a correct conversion factor?
A)1 dozen eggs = 12 eggs
B)12 eggs = 1 dozen eggs
C)1 pair of shoes = 1 shoe
D)100 pennies = 1 dollar
E)5 cents = 1 nickel
Answer: C
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Page 4
Chapter 3: Matter and Energy
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Sample Questions
Q1) If a pure material decomposes when heated into simpler substances,this proves that the material was a compound.
A)True
B)False
Answer: True
Q2) How many joules are in 55.2 calories?
A)13,200
B)55,200
C)13.2
D)231
E)none of the above
Answer: D
Q3) Which among the following statements is false?
A)A solid has a definite shape and a definite volume.
B)A liquid has a definite volume;but it has no definite shape.
C)A gas has neither definite volume nor definite shape.
D)Both solids and liquids are incompressible while gases are compressible.
E)none of the above
Answer: E
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Page 5
Chapter 4: Atoms and Elements
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Sample Questions
Q1) Group 2A elements are also called:
A)noble gases.
B)halogens.
C)alkaline earth metals.
D)alkali metals.
E)none of the above
Q2) The nucleus of an atom is a very small,dense region that contains over 99.9% of the atomic mass.
A)True
B)False
Q3) John Dalton formalized an atomic theory that gained acceptance in the early 19th century.
A)True
B)False
Q4) The elements within a group on the periodic table tend to have similar properties.
A)True
B)False
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6
Chapter 5: Molecules and Compounds
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Sample Questions
Q1) The proper name for the acid HF is hydrofluoric acid.
A)True
B)False
Q2) The ionic compound that forms between Mg and O is MgO.
A)True
B)False
Q3) Carbon is considered which of the following?
A)atomic element
B)molecular element
C)molecular compound
D)ionic compound
E)none of the above
Q4) The phosphorous-to-hydrogen mass ratio is 10.2 for a compound.This ratio could correspond to the compound:
A)PH.
B)PH<sub>2.</sub>
C)PH<sub>3.</sub>
D)PH<sub>6.</sub>
E)none of the above
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Chapter 6: Chemical Composition
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Sample Questions
Q1) What is the mass percent of oxygen in sodium oxide?
A)37.1
B)25.8
C)74.2
D)62.0
E)none of the above
Q2) An estrogen compound with the empirical formula
C<sub>12</sub>H<sub>17</sub>O<sub>2</sub> has a molecular mass of 386.6 g/mol.What is the value of n necessary to find the molecular formula?
A)0.2
B)1
C)2
D)20
E)none of the above
Q3) The molecular formula is equal to the empirical formula multiplied by a whole number integer.
A)True
B)False
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Chapter 7: Chemical Reactions
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Sample Questions
Q1) What type of a reaction occurs when a potassium nitrate solution is mixed with a barium acetate solution?
A)precipitation
B)acid-base neutralization
C)oxidation-reduction
D)gas evolution
E)no reaction
Q2) Which of the following is NOT typically a sign of a chemical reaction?
A)absorbing heat when chemicals are contacted with each other
B)emission of heat when chemicals are contacted with each other
C)emission of light when chemicals are contacted with each other
D)absorbing light when chemicals are contacted with each other
E)All of the above are signs of a chemical reaction.
Q3) Mixing two aqueous solutions will always result in formation of a precipitate.
A)True
B)False
Q4) Decomposition reactions usually require energy to initiate the reaction.
A)True
B)False
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Chapter 8: Quantities in Chemical Reactions
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Sample Questions
Q1) Before determining conversion factors,it is necessary to make sure the equation is properly balanced.
A)True
B)False
Q2) Given the reaction: 2 Na(s)+ Cl<sub>2</sub>(g) 2 NaCl(s)
The conversion factor for chlorine gas to sodium chloride is: 1 mol Cl<sub>2 </sub> 2 mol NaCl
A)True
B)False
Q3) Consider the following generic chemical equation: 2A + 5B C + 3D
If you react 4 units of A with 10 units of B,which statement is TRUE?
A)Substance A will be the limiting reactant.
B)Substance B will be the limiting reactant.
C)There is just enough of A and B so that everything reacts completely.
D)Substance C cannot be formed from this reaction.
E)none of the above
Q4) The actual yield is the amount of product actually produced by a chemical reaction.
A)True
B)False
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Chapter 9: Electrons in Atoms and the Periodic Table
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Sample Questions
Q1) Which of the following elements has the electron configuration of 3s<sup>2</sup>3p<sup>4</sup> in its outermost shell?
A)Al
B)Si
C)S
D)Cl
E)none of the above
Q2) The higher the principal quantum number,the lower the orbital energy.
A)True
B)False
Q3) Which among the following statements is TRUE?
A)The wavelength of light is inversely related to its energy.
B)As the energy increases,the frequency of radiation decreases.
C)As the wavelength increases,the frequency also increases.
D)Red light has a shorter wavelength than violet light.
E)none of the above
Q4) A principal shell with a value of n=3 would contain s,p,d,and f orbitals.
A)True
B)False
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Chapter 10: Chemical Bonding
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Sample Questions
Q1) The VSEPR theory predicts that the angle between the central carbon atom and the two oxygen atoms in CO<sub>2</sub> measures 180°.
A)True
B)False
Q2) Which one of the following molecules is NOT capable of having resonance structures?
A)SeO<sub>2</sub>
B)H<sub>2</sub>O
C)SO<sub>2</sub>
D)O<sub>3</sub>
E)none of the above
Q3) What is the molecular geometry of SiH<sub>4</sub>?
A)bent
B)linear
C)tetrahedral
D)trigonal pyramidal
E)not enough information
Q4) Lewis structures only use the valence electrons in determining the bonding.
A)True
B)False
Page 12
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Chapter 11: Gases
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Sample Questions
Q1) The volume of a gas is independent of the temperature.
A)True
B)False
Q2) Which conditions can cause nonideal gas behavior by 1)decreasing the space between gas particles or 2)by slowing gas particles so that interactions are significant?
A)1)high pressure;2)high temperature
B)1)high pressure;2)low temperature
C)1)low pressure;2)high temperature
D)1)low pressure;2)low temperature
E)none of the above
Q3) If the volume of a gas container at 32.0°C changes from 1.55 L to 755 mL,what will the final temperature be?
A)149°C
B)353°C
C)273°C
D)-124°C
E)none of the above
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13
Chapter 12: Liquids,solids,and Intermolecular Forces
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Sample Questions
Q1) The heat of fusion for water is significantly more than the heat of vaporization for water because fusion requires complete separation of one molecule from another.
A)True
B)False
Q2) Atomic solids,such as graphite,have a weak dispersion force holding them together.
A)True
B)False
Q3) Which statement below is false?
A)A hydrogen bond is the strongest of the intermolecular forces.
B)A hydrogen atom must be bonded directly to fluorine,oxygen,or nitrogen to exhibit hydrogen bonding.
C)The large electronegativity difference between hydrogen and an F,O,or N atom is essential for the formation of a hydrogen bond.
D)A hydrogen bond is only 2-5% the strength of a typical covalent bond.
E)none of the above
Q4) Dipole-dipole forces are weaker than dispersion forces.
A)True
B)False
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Page 14
Chapter 13: Solutions
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Sample Questions
Q1) The solubility of a gas in a liquid can always be increased by:
A)increasing the temperature of the solvent.
B)decreasing the polarity of the solvent.
C)decreasing the pressure of the gas above the solvent.
D)increasing the pressure of the gas above the solvent.
E)none of the above
Q2) You need to prepare 2.00 L of 0.100 M Na<sub>2</sub>CO<sub>3</sub> solution.The best procedure is to weigh out:
A)10.6 g Na<sub>2</sub>CO<sub>3</sub> and add 2.00 L of water to it.
B)21.2 g Na<sub>2</sub>CO<sub>3</sub> and add 2.00 L of water to it.
C)10.6 g Na<sub>2</sub>CO<sub>3</sub> and add water until the final solution has a volume of 2.00 L.
D)21.2 g Na<sub>2</sub>CO<sub>3</sub> and add water until the final solution has a volume of 2.00 L.
Q3) Upon completing a dilution from a stock solution,you will always have more volume of solution than you started with and it will have a lower concentration than the stock solution.
A)True
B)False
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Page 15
Chapter 14: Acids and Bases
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Sample Questions
Q1) A neutralization reaction between KOH (aq)and H<sub>2</sub>SO<sub>4</sub> (aq)would give which two products?
A)H<sub>2</sub>O (l)and H<sub>2</sub>S (g)
B)H<sub>2</sub>O (l)and KSO<sub>4</sub> (aq)
C)H<sub>2</sub>O (l)and K<sub>2</sub>SO<sub>4</sub> (aq)
D)SO<sub>2</sub> (g)and KH<sub>2</sub> (g)
E)none of the above
Q2) Carboxylic acids can be found in:
A)grapes.
B)apples.
C)lemons.
D)all of the above
E)none of these
Q3) The pH of 0.001 M HCl is 3.0.
A)True
B)False
Q4) A buffer resists a change in pH by being able to react with an acid or a base.
A)True B)False
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Chapter 15: Chemical Equilibrium
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Sample Questions
Q1) What happens to the equilibrium constant when a catalyst is added to the reaction mixture?
A)increases
B)decreases
C)does not change
D)varies
E)none of the above
Q2) The larger the equilibrium constant,the greater is the concentration of reactants relative to products at equilibrium.
A)True
B)False
Q3) What happens to the equilibrium position of an endothermic reaction when you add heat?
A)shifts to the left
B)shifts to the right
C)does nothing
D)doubles
E)halves
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17
Chapter 16: Oxidation and Reduction
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Sample Questions
Q1) The oxidizing agent is the substance being reduced.
A)True
B)False
Q2) The cathode is the electrode at which reduction occurs.
A)True
B)False
Q3) For the reaction Si (s)+ O<sub>2 </sub>(g) SiO<sub>2</sub> (g),the reducing agent is:
A)Si.
B)O<sub>2</sub>.
C)SiO<sub>2</sub>.
D)O.
E)none of the above
Q4) The half-reaction 2 Br <sup>1-</sup> Br<sub>2</sub> + 2 e<sup>-</sup> is balanced with respect to mass but it is not balanced with respect to charge.
A)True
B)False
Q5) Reduction is the gain of electrons.
A)True
B)False
18
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Chapter 17: Radioactivity and Nuclear Chemistry
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Sample Questions
Q1) The combination of two light nuclei to form a heavier one is known as nuclear fission.
A)True
B)False
Q2) Nuclear equations do not need to be balanced since a new element forms.
A)True
B)False
Q3) Which of the following types of radiation has the highest penetrating power?
A)alpha particles
B)beta particles
C)gamma rays
D)positrons
E)none of the above
Q4) C-14 dating has been verified using old iron ore samples of known age.
A)True
B)False
Q5) Carbon-14 dating is not dependable when attempting to date objects that are more than 50,000 years old.
A)True
B)False
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Chapter 18: Organic Chemistry
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Sample Questions
Q1) How many carbon atoms would be in the compound named chlorobenzene?
A)1
B)5
C)6
D)7
E)none of the above
Q2) The prefix "but-" means that the base chain contains how many carbon atoms?
A)2
B)4
C)6
D)8
E)all of the above
Q3) The compound named 2,3-dimethylpentane would have how many total number of carbons?
A)3
B)5
C)7
D)8
E)none of the above
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Page 20
Chapter 19: Biochemistry
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Sample Questions
Q1) The complementary base sequence to GTAGCT is:
A)CATCGA.
B)ACGATC.
C)GCAGTA.
D)AGTCGA.
E)none of the above
Q2) Carbohydrates have the general formula of (CH<sub>2</sub>O)<sub>n</sub>.
A)True
B)False
Q3) A codon is a section of DNA that specifies a single amino acid.
A)True
B)False
Q4) Which of the following statements about amino acids is FALSE?
A)Amino acids are the monomers of protein molecules.
B)Amino acids all have an amine group,a side chain,and a carboxylic acid.
C)Amino acids bond to each other through a peptide bond.
D)Amino acids all have very similar physical properties.
E)All of the statements are true.
Q5) Summarize the main features of the four categories of protein structure.
Q6) What is the difference between saturated and unsaturated fatty acids?
Page 21
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