Preparatory Chemistry
Chapter Exam Questions
Course Introduction
Preparatory Chemistry is designed to provide students with a solid foundation in basic chemical principles and laboratory techniques necessary for success in more advanced chemistry courses. The course covers essential topics such as atomic structure, periodic trends, chemical bonding, stoichiometry, states of matter, solutions, and introductory thermodynamics. Through a combination of lectures, problem-solving, and hands-on laboratory exercises, students develop the analytical and critical thinking skills needed to approach chemical problems effectively. This course is ideal for students who need to strengthen their understanding of chemistry before enrolling in general or organic chemistry sequences.
Recommended Textbook
Introductory Chemistry 5th Edition by Nivaldo J. Tro
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Chapter 1: The Chemical World
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Sample Questions
Q1) The key to success in chemistry is:
A)curiosity.
B)mathematical skills.
C)commitment.
D)practice.
E)all of the above
Answer: E
Q2) Both carbon dioxide molecules and water molecules consist of three atoms bonded together in a straight line.
A)True
B)False
Answer: False
Q3) Different molecules can have different shapes.
A)True
B)False
Answer: True
Q4) What is chemistry?
Answer: Chemistry is branch of science that explains the properties and behavior of different forms of matter,in the broadest sense,by helping us understand the atoms and molecules that compose them.
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Chapter 2: Measurement and Problem Solving
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Sample Questions
Q1) In multiplication and division calculations,the answer will have the same number of decimal places as the number carrying the fewest decimal places.
A)True
B)False
Answer: False
Q2) How many liters are in 333 mL?
A)3.33 × 10<sup>5</sup>
B)0.333
C)33.3
D)3.33
E)none of the above
Answer: B
Q3) A solution map diagrams the steps required to get from the starting point to the end point of a calculation problem.
A)True
B)False
Answer: True
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4
Chapter 3: Matter and Energy
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Sample Questions
Q1) When a cold ice cube is dropped into a warm cup of water,energy is transferred as heat from the ice to the water.
A)True
B)False
Answer: False
Q2) Water is a mixture.
A)True
B)False
Answer: False
Q3) When a temperature in degrees Celsius is converted to kelvins,the Kelvin value will have the same number of decimal places as the Celsius value.
A)True
B)False
Answer: True
Q4) In a chemical reaction,the substances present after the chemical change are called reactants.
A)True
B)False
Answer: False
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Chapter 4: Atoms and Elements
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Sample Questions
Q1) The atomic number of nitrogen is 14.01.
A)True
B)False
Q2) When an atom loses an electron,the resulting particle is called:
A)a proton.
B)an anion.
C)a cation.
D)an isotope.
E)none of the above
Q3) Xe is a member of which family?
A)noble gases
B)halogens
C)alkaline earth metals
D)alkali metals
E)none of the above
Q4) The elements within a group on the periodic table tend to have similar properties.
A)True
B)False
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Chapter 5: Molecules and Compounds
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Sample Questions
Q1) Molecular elements do not exist in nature.
A)True
B)False
Q2) Which metal atom below cannot form a cation of several different charges?
A)Cr
B)Mn
C)Fe
D)Ba
E)none of the above
Q3) What is the formula for an ionic compound made of magnesium and sulfur?
A)MgS
B)MgS<sub>2</sub>
C)Mg<sub>2</sub>S
D)Mg<sub>2</sub>S<sub>3</sub>
E)none of the above
Q4) Carbon dioxide is an example of a molecular compound.
A)True
B)False
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Chapter 6: Chemical Composition
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Sample Questions
Q1) How many molecules of nitrogen monoxide are in a 22.5 gram sample?
A)5.86 × 10<sup>23</sup>
B)7.33 × 10<sup>23</sup>
C)4.51 × 10<sup>23</sup>
D)4.06 × 10<sup>23</sup>
E)none of the above
Q2) One mole of boron has a mass of ________ g.
A)9.012
B)6.022 × 10<sup>23</sup>
C)5
D)10.811
E)none of the above
Q3) Bauxite is an ore that contains the element aluminum.If you obtained 108 grams of aluminum from an ore sample that initially weighed 204 grams,what is the mass percent of aluminum in this bauxite ore?
A)52.9
B)15.6
C)0.53
D)47.1
E)none of the above
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Chapter 7: Chemical Reactions
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Sample Questions
Q1) Considering the following precipitation reaction: Pb(NO<sub>3</sub>)<sub>2</sub>(aq)+ 2KI(aq) PbI<sub>2</sub>(s)+ 2KNO<sub>3</sub>(aq)
What is the correct net ionic equation?
A)Pb<sup>2+</sup> + I<sub>2</sub><sup>-</sup> PbI<sub>2</sub>(s) B)2NO<sub>3</sub><sup>-</sup> + 2K<sup>+</sup> 2KNO<sub>3</sub> C)Pb<sup>2+</sup> + 2NO<sub>3</sub><sup>-</sup> + 2K<sup>+</sup> + 2I<sup>-</sup> PbI<sub>2</sub>(s)+ 2K<sup>+</sup> + 2NO<sub>3</sub><sup>-</sup> D)Pb<sup>2+</sup> + 2I<sup>-</sup> PbI<sub>2</sub>(s) E)none of the above
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) A net ionic equation shows all ionic species that are present in solution. A)True B)False
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Chapter 8: Quantities in Chemical Reactions
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Sample Questions
Q1) Which of the following is TRUE?
A)Stoichiometry shows the numerical relationship between chemical quantities in a balanced chemical equation.
B)Stoichiometry allows prediction of the amounts of products that form in a chemical reaction based on the amounts of reactants.
C)Stoichiometry allows prediction of how much of the reactants are necessary to form a given amount of product.
D)All of the above are true.
E)None of the above are true.
Q2) Given the reaction: 2 Na(s)+ Cl<sub>2</sub>(g) 2 NaCl(s)
The conversion factor for chlorine gas to sodium metal is: 2 mol Cl 2 mol Na
A)True
B)False
Q3) The actual yield is the same as the theoretical yield if the reaction goes to completion and there is no loss of product.
A)True
B)False
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Chapter 9: Electrons in Atoms and the Periodic Table
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Sample Questions
Q1) Light is a type of matter.
A)True
B)False
Q2) Which color of the visible spectrum has photons with the most energy?
A)red
B)orange
C)green
D)violet
E)yellow
Q3) Which form of electromagnetic radiation has photons with the lowest energy?
A)Radio Waves
B)Microwaves
C)X-rays
D)Gamma Rays
E)Infrared Radiation
Q4) The orbital diagram for fluorine shows 1 unpaired electron in a p orbital.
A)True
B)False
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Chapter 10: Chemical Bonding
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Sample Questions
Q1) Carbon monoxide contains resonance Lewis structures.
A)True
B)False
Q2) Which of the following compounds would have a linear molecular geometry?
1.N<sub>2</sub>
2.H<sub>2</sub>S
3.CO<sub>2</sub>
A)1 and 2 only
B)1 and 3 only
C)2 and 3 only
D)1,2 and 3
E)neither 1,2,or 3
Q3) How many lone electron pairs does the ClO (-1 charged)polyatomic anion have?
A)one
B)three
C)six
D)two
E)none of the above
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Chapter 11: Gases
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Sample Questions
Q1) What is the equivalent pressure of 1520 torr in units of atm?
A)203,000
B)380.
C)2.00
D)1520
E)none of the above
Q2) A rigid cylinder contains 2.00 liters of gas at a temperature of 25°C.If the pressure of this gas is changed from 0.500 atmospheres to 1.50 atmospheres,what will be the new temperature (in Kelvin,reported to three significant figures)of the gas? (The volume is constant. )
A)99.3 K
B)75.0 K
C)8.33 K
D)894 K
E)none of the above
Q3) STP conditions are 273 K and 760 mm Hg.
A)True
B)False
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Chapter 12: Liquids,solids,and Intermolecular Forces
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Sample Questions
Q1) The rate of evaporation will increase if you pour a liquid out onto a large surface.
A)True
B)False
Q2) Which substance below is an ionic solid?
A)Cu (s)
B)H<sub>2</sub>O (s)
C)MgO (s)
D)C<sub>6</sub>H<sub>12</sub>O<sub>6 </sub>(s)
E)none of the above
Q3) Intermolecular forces are the attractive forces between atoms within a compound. A)True
B)False
Q4) Liquids that are viscous flow more slowly than liquids that are not viscous. A)True
B)False
Q5) Ice can float in a glass of liquid water because the solid form of water is more dense than the liquid form.
A)True
B)False
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Chapter 13: Solutions
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Sample Questions
Q1) A sample of salt water will freeze at a higher temperature than a sample of pure water.
A)True B)False
Q2) In comparing a 0.25 molality aqueous NaCl solution to a 0.25 molality aqueous CaCl<sub>2</sub> solution:
A)the NaCl solution has the higher boiling point and the lower freezing point.
B)the CaCl<sub>2</sub> solution has the higher boiling point and the lower freezing point.
C)the NaCl solution has the higher boiling point and the CaCl<sub>2</sub> solution has the lower freezing point.
D)the CaCl<sub>2</sub> solution has the higher boiling point and the NaCl solution has the lower freezing point.
E)both solutions have the same boiling point and the same freezing point.
Q3) The solubility of solids in water generally increases with increasing temperature.
A)True B)False
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Chapter 14: Acids and Bases
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Sample Questions
Q1) Pure water cannot conduct electricity so why do we have to be careful with electrical appliances near water?
A)OSHA regulations
B)Water can be broken down by electricity.
C)Water always has some ions dissolved in it.
D)Water dissociates fully into its ions.
E)none of the above
Q2) Aluminum is one of the few metals that dissolves in a strong base.
A)True
B)False
Q3) In examining the formula for acetic acid,HC<sub>2</sub>H<sub>3</sub>O<sub>2</sub>,the ionizable hydrogen atom(s)is/are:
A)the H on the left.
B)one of the H's on the right-side.
C)all of the H's on the right-side.
D)all four H's.
E)none of the above.
Q4) When a metal reacts with an acid it produces salt and water.
A)True
B)False
Page 16
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Chapter 15: Chemical Equilibrium
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Sample Questions
Q1) Which of the following changes will increase the reaction rate?
A)an increase in the concentration of the products
B)a decrease of the reaction temperature
C)allowing more time for the reaction
D)an increase in the concentration of reactants
E)all of the above
Q2) Placing a [ ] around the formula of a chemical means that we are referring to the molar concentration of that chemical.
A)True
B)False
Q3) Which statement about activation energy is FALSE?
A)Activation energy is an energy hump that normally exists between reactants and products.
B)The higher the activation energy,the slower the reaction rate.
C)The lower the activation energy,the faster the reaction rate.
D)Increasing the temperature lowers the activation energy.
E)All of the above are true.
Q4) Reaction rates generally increase as a reaction proceeds.
A)True
B)False
17
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Chapter 16: Oxidation and Reduction
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Sample Questions
Q1) Reduction can be defined as the gain of oxygen atoms by another element.
A)True
B)False
Q2) Balance the following half reaction in base solution: H<sub>2</sub>0 (l) H<sub>2</sub> (g)
A)2H<sub>2</sub>O (l)+ 2 e<sup>-</sup> H<sub>2</sub> (g)+ 2 OH<sup>-</sup> (aq)
B)2H<sub>2</sub>O (l) 2H<sub>2</sub> (g)+ 2 e<sup>-</sup> + O<sub>2</sub>
C)2H<sub>2</sub>O (l) H<sub>2</sub> (g)+ 2 H<sup>+</sup> + 2e<sup>-</sup>
D)H<sub>2</sub>O (l) 2H<sup>+</sup> + 2OH<sup>-</sup>
E)2H<sub>2</sub>O (l) H<sub>2</sub> (g)+ 2OH<sup>-</sup> (aq)+ 5 e<sup>-</sup>
Q3) Fuel cells are based on the tendency of some elements to gain electrons from gasoline.
A)True
B)False
Q4) A spontaneous redox reaction can be used to produce electrical current.
A)True
B)False
Q5) Distinguish between a galvanic (voltaic)cell and an electrolytic cell.
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Chapter 17: Radioactivity and Nuclear Chemistry
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Sample Questions
Q1) Briefly describe the main features of the three types of radiation: alpha,beta,and gamma.Also explain what happens to the nucleus of an atom when it is exposed to each of these.
Q2) What happens to the mass number of a nucleus that emits a positron?
A)It remains the same.
B)It increases by one.
C)It decreases by one.
D)It increases by two.
E)It decreases by two.
Q3) When an atom emits a beta particle,its atomic number increases by one because it now has one additional proton.
A)True
B)False
Q4) Carbon-14 dating is not dependable when attempting to date objects that are more than 50,000 years old.
A)True
B)False
Q5) The hydrogen isotope known as tritium contains three neutrons.
A)True
B)False
19
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Chapter 18: Organic Chemistry
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Sample Questions
Q1) The compound propyne would consist of how many carbon atoms and how many hydrogen atoms?
A)3C,4H
B)2C,2H
C)3C,2H
D)3C,6H
E)none of the above
Q2) The reaction CH<sub>2</sub>=CH<sub>2</sub> + H<sub>2</sub> CH<sub>3</sub>CH<sub>3</sub> would best be described as:
A)substitution.
B)combustion.
C)addition.
D)hydrogenation.
E)none of the above
Q3) What is the formula for propene?
A)C<sub>3</sub>H<sub>8</sub>
B)C<sub>3</sub>H<sub>6</sub>
C)C<sub>3</sub>H<sub>4</sub>
D)C<sub>3</sub>H<sub>3</sub>
E)none of the above
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Chapter 19: Biochemistry
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Sample Questions
Q1) The most common repeating pattern that is found along the secondary structure of a protein chain is:
A) -helix.
B) -pleated sheet.
C) -turn.
D)random coil.
E)none of the above
Q2) A gene is a portion of DNA that codes for a single protein.
A)True
B)False
Q3) Carbohydrates provide short term energy storage in cells.
A)True
B)False
Q4) The portion of the cell that contains the genetic information is called ________.
A)cytoplasm
B)membrane
C)nucleus
D)mitochondria
E)none of the above
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