Fall Semester Review Unit 1 and Unit 2 PDF

chinari (dc52863) – Fall Semester Review Unit 1 and Unit 2 – dado – (6274) 1 This print-out should have 68 questions. are chemical properties? Multiple-choice questions may continue on the next column or page – find all choices 1. I and III only before answering....

chinari (dc52863) – Fall Semester Review Unit 1 and Unit 2 – dado – (6274) 1 This print-out should have 68 questions. are chemical properties? Multiple-choice questions may continue on the next column or page – find all choices 1. I and III only before answering. 2. All of these 001 10.0 points What of these processes is a chemical change, 3. I only NOT a physical change? 4. I and II only 1. the dissolving of salt in water 5. II and III only 2. the boiling of mercury 6. None of these 3. melting ice 7. III only 4. the breaking of a pencil 8. II only 5. the burning of a match 005 10.0 points 002 10.0 points If you were to hammer some gold into a thin One afternoon, a man painted his house sheet, the atoms brown. Two days later, however, the house caught on fire and burned down. What two 1. None of these changes occurred to the house? 2. would be unchanged. 1. The painting was a chemical change and the burning was a chemical change. 3. would be pushed closer together. 2. The painting was a physical change and 4. would each flatten out. the burning was a chemical change. 5. would weigh less. 3. Both painting and burning were physical changes. 006 10.0 points Elements can be distinguished by their 4. Neither physical nor chemical changes occurred. 1. hardness. 5. Both painting and burning were chemical 2. brittleness. changes. 3. density. 003 10.0 points Keeping in mind rounding and significant fig- 4. transparency. ures, what is 53/40/13.4? 007 10.0 points 004 10.0 points Which of the following is a physical change? Which of the properties I) oxidation strength 1. A liquid evaporates. II) basicity III) reducing strength 2. Light is given off as two liquids mix.  chinari (dc52863) – Fall Semester Review Unit 1 and Unit 2 – dado – (6274) 2 3. An iron nail rusts. 5. 5 4. Carbon dioxide is produced by burning 6. 3 gasoline. 011 10.0 points 008 10.0 points What is the answer with the proper significant Which of the following is a chemical change? figures for the following equation? 1. A rock is eroded by the wind. (7.6 + 8.401) × 4.2 × 0.688 = 2. Sulfur dioxide is formed when sulfur com- bines with oxygen. 1. 46.2 3. Ice forms in a pond. 2. 46.24 4. A candle melts. 3. 44.2365 009 10.0 points 4. 46 What is the proper solution to the following equation? 5. 46.237 (150. + 2.5 + 36.75) ÷ (6.60 + 0.173) = 012 10.0 points What is the proper solution to the following 1. 27.94 equation? 2. 27.9 ( 27.9 ÷ 4.0 ) − 7.6134 + 11.431 = 3. 27.9418 1. 11 4. 27.94183 2. 10.8 5. 27.942 3. 10.79 6. 30 4. 10.7926 7. 28 5. 10.793 010 10.0 points How may significant digits are found in 013 10.0 points 765.000? Calculate the quantity 97.6 cm − 1.690 cm. 1. 2 1. 95.910 cm 2. 4 2. 96 cm 3. None 3. 95.91 cm 4. 6 4. 95.9 cm  chinari (dc52863) – Fall Semester Review Unit 1 and Unit 2 – dado – (6274) 3 5. 95.9100 cm 1. accuracy 014 10.0 points 2. precision Keeping in mind the rules for significant dig- its, subtract 8.38 cm from 9.7 cm. 019 10.0 points You bought a 5 pound bag of sugar at H.E.B. 1. 1.320 cm Not trusting the store, you weighed the sugar at home to make sure that you got what you 2. 1.32 cm paid for. Your scale reports that the store’s 5 pound bag of sugar does weigh 5 lbs. This is 3. 1.32000 cm an example of 4. 1.3 cm 1. accuracy. 5. 1.3200 cm 2. precision. 6. 1 cm 020 10.0 points You have a reported 1 pound bar of gold, but 015 10.0 points every time you weigh it, the scale reports that The major importance of significant figures is it weighs 937.00 g. This is an example of 1. to assist in conversion to metric units. 1. precision. 2. to make it easier to round off numbers. 2. accuracy. 3. to show the degree of uncertainty or pre- 021 10.0 points cision in measurements. The number 8.314 written in scientific nota- tion becomes 4. to provide a logical strategy for dimen- sional analysis. 1. 8.314 × 100 5. All of these answers are correct. 2. 8.314 × 101 016 10.0 points 3. 83.14 × 10−2 Keeping in mind scientific notation, rounding, and significant figures, what is 23 × 10? 4. 83.14 × 10−1 017 10.0 points 5. 8.314 × 102 ? refers to how closely a measured value agrees with the correct value. 6. 8.314 × 10−1 1. precision 022 10.0 points The number 2 × 1015 is 2. accuracy 1. More information is needed. 018 10.0 points ? refers to how closely individual measure- 2. greater than one. ments agree with each other.  chinari (dc52863) – Fall Semester Review Unit 1 and Unit 2 – dado – (6274) 4 3. smaller than 2.0 × 10−15. 027 10.0 points The measurement 3.2 × 10−3 g could also be 4. less than one. written as 023 10.0 points 1. 3.2 mg. What is 0.00397 in scientific notation? 2. 3.2 pg. 1. 39.7 × 10 −5 3. 3.2 g. 5 2. 3.97 × 10 4. 3.2 kg. 3 3. 3.97 × 10 5. None of these 4. 3.97 × 10 −3 028 10.0 points 024 10.0 points Which volume is the smallest? The quantity 0.0000064 g expressed in scien- tific notation is 1. One microliter 1. 6.4 × 10−7 g. 2. One liter 2. 6.4 × 106 g. 3. One deciliter 3. 6.4 × 107 g. 4. One milliliter 4. 6.4 × 10−6 g. 029 10.0 points A factor of 1.0 × 101 corresponds to the prefix 025 10.0 points What is 0.00875 in scientific notation? 1. centi. 1. 8.8 × 10−3 2. delli. 2. 8.75 × 103 3. deka. 3. 0.0875 × 101 4. deci. 4. 8.75 × 10−3 030 10.0 points A factor of 1.0×10−2 corresponds to the prefix 026 10.0 points Which is the biggest number? 1. deka. 1. 4 × 10−8 2. centi. 2. 3 × 10−8 3. milli. 3. 4 × 10−18 4. kilo. 4. 3.0 × 10−18 031 10.0 points A factor of 1.0×10−3 corresponds to the prefix  chinari (dc52863) – Fall Semester Review Unit 1 and Unit 2 – dado – (6274) 5 2. gas 1. centi. 3. solid 2. kilo. 4. plasma 3. milli. 036 10.0 points 4. deci. You can compress a gas because 032 10.0 points 1. it is composed of elements. A factor of 1.0 × 106 corresponds to the prefix 2. it is composed of large particles. 1. giga. 3. it is composed of small particles. 2. mega. 4. of the enormous empty space between its 3. tera. particles. 4. kilo. 037 10.0 points Which of the following is NOT a true state- 033 10.0 points ment about gases? A factor of 1.0×10−9 corresponds to the prefix 1. Gases have no definite volume. 1. micro. 2. Gas volume decreases with increasing 2. milli. pressure. 3. nano. 3. Gases are not compressible. 4. pico. 4. Gases have no definite shape. 034 10.0 points 038 10.0 points The prefix centi means What is NOT true of a gas? 1. one thousand (1000). 1. A gas can be compressed into a very small volume. 2. one hundred (100).   2. The particles of a gas tend to perme- 1 ate the entire volume into which they are 3. one thousandth. 1000 released.   1 4. one hundredth. 3. The particles of a gas are held together 100 by strong attractive forces. 035 10.0 points What has a definite volume but no definite 4. A gas exerts pressure continuously and in shape? all directions on the walls of a vessel in which it is contained. 1. liquid 039 10.0 points  chinari (dc52863) – Fall Semester Review Unit 1 and Unit 2 – dado – (6274) 6 Which of the following is NOT a true state- 043 10.0 points ment about liquids? When one substance changes into one or more new substances, it has exhibited a 1. Liquids have no definite shape. 1. chemical property. 2. The boiling point of a liquid will decrease with decreasing atmospheric pressure. 2. chemical change. 3. The boiling point of a liquid will increase 3. physical change. with increasing atmospheric pressure. 4. chemical reaction. 4. Liquids have no definite volume. 044 10.0 points 040 10.0 points Changes in which NO new kinds of matter are Which of the following is NOT a true state- produced are called ment about solids? 1. physical changes. 1. The melting point of a solid is not affected by atmospheric pressure. 2. exothermic changes. 2. Solids are easily compressible. 3. chemical changes. 3. Solids have definite shape. 4. nuclear changes. 4. Solids have definite volume. 045 10.0 points An example of a chemical change is 041 10.0 points When a substance changes from a solid to a 1. a rusting nail. gas without becoming a liquid, it has 2. dissolving sugar in tea. 1. melted. 3. melting ice. 2. vaporized. 4. mixing alcohol and water. 3. evaporated. 046 10.0 points 4. sublimed. A chemist investigates the 042 10.0 points I) boiling point All changes in phase are II) flammability III) melting point 1. chemical changes. of acetone, a component of fingernail polish remover. Which is/are physical? 2. chemical reactions. 1. I, II and III 3. physical changes. 2. None of these 4. chemical properties. 3. I and II only  chinari (dc52863) – Fall Semester Review Unit 1 and Unit 2 – dado – (6274) 7 2. specific heat 4. I and III only 3. color 5. I only 4. density 6. II only 5. heat capacity 7. II and III only 050 10.0 points 8. III only Compounds are 047 10.0 points 1. pure substances that are made of more Consider the statement: than one element. “The temperature of the land is an impor- tant factor for the ripening of oranges, be- 2. physically combined. cause it affects the evaporation of water and the humidity of the surrounding air.” 3. made of only one kind of atom. How many of these factors, temperature ripening 4. substances that cannot be broken down. evaporation humidity are physical properties or changes? 051 10.0 points Which of the following is an example of a 1. 3 mixture? 2. 1 1. sodium chloride 3. 2 2. salt water 4. None 3. ammonia 5. 4 4. oxygen gas 048 10.0 points 052 10.0 points Which of the following is a chemical property? A stirred mixture of sand and water is a 1. the ability to burn in air 1. compound. 2. the melting point of a pure substance 2. solution. 3. the hardness of a metal 3. None of these 4. the color of a solid 4. pure substance. 049 10.0 points 053 10.0 points Which of the following is NOT an intensive Matter that has different parts with different property of a pure substance? properties is said to be 1. temperature 1. heterogeneous.  chinari (dc52863) – Fall Semester Review Unit 1 and Unit 2 – dado – (6274) 8 2. composed of a pure substance. 057 10.0 points Atoms can interact with one another by shar- 3. a compound. ing 4. homogeneous. 1. electrons. 054 10.0 points 2. nuclei. Most of the space occupied by a thin gold film is taken up by the nuclei. 3. neutrons. 1. True 4. isotopes. 2. False 5. protons. 055 10.0 points 058 10.0 points Identify the experimental evidence that indi- How many protons are present in an atom cates an atom has a positively charged nu- which has an atomic number of 33? cleus. Answer in units of protons. 1. Cathode rays are attracted to the positive 059 10.0 points plate of an applied electrical field. The sum of the protons and neutrons in the nucleus of an atom is the 2. α particles are deflected at large angles when projected toward a thin sheet of metal. 1. atomic weight. 3. Line spectra are produced from elemental 2. mass number. gases in a gaseous discharge tube. 3. element number. 4. Cathode rays produce diffraction pat- terns. 4. atomic number. 5. Electrons can be ejected from a metallic 060 10.0 points surface with high energy light. The subatomic particle that is neutral is 056 10.0 points 1. an isotope. Which one of the following is NOT part of Dalton’s atomic theory? 2. a proton. 1. Atoms change into other atoms in chemi- 3. a nucleus. cal reactions. 4. an electron. 2. Matter is composed of atoms. 5. a neutron. 3. Atoms of different elements have different properties. 061 10.0 points What is the atomic number of oxygen? 4. Atoms of the same element have the same properties. 1. 6  chinari (dc52863) – Fall Semester Review Unit 1 and Unit 2 – dado – (6274) 9 2. 16 6. 104 Cs 3. 15.9994 7. 71 Hf 4. 8 065 10.0 points What characteristics do atoms of argon-40, 5. 31.9988 potassium-40, and calcium-40 have in com- mon? 062 10.0 points A magnesium (Mg) atom with a mass number 1. same number of protons and same number of 25 contains of electrons 1. 25 protons, 25 neutrons and 25 elec- 2. same mass trons. 3. same number of neutrons and same num- 2. None of these ber of protons 3. 13 protons, 12 neutrons and 12 elec- 4. same number of protons trons. 5. same number of neutrons 4. 12 protons, 13 neutrons and 12 elec- trons. 6. same number of neutrons and same num- ber of electrons 5. 25 protons, 13 neutrons and 25 elec- trons. 7. same number of electrons 063 10.0 points 066 10.0 points 12 14 C and C are How many protons, electrons, and neutrons are in an atom of bromine-80? 1. allotropes. 1. 45 protons; 35 electrons; 35 neutrons 2. isotopes. 2. 35 protons; 45 electrons; 35 neutrons 3. ions. 3. 35 protons; 35 electrons; 45 neutrons 064 10.0 points Identify the isotope that has atoms with 104 4. 35 protons; 45 electrons; 45 neutrons neutrons, 71 protons, and 71 electrons. 5. 45 protons; 45 electrons; 35 neutrons 175 1. Ta 6. 35 protons; 35 electrons; 35 neutrons 71 2. W 7. None of these 175 3. Lu 8. 45 protons; 35 electrons; 45 neutrons 175 4. Ba 067 10.0 points 5. None of these Write the nuclide symbol for carbon-13.  chinari (dc52863) – Fall Semester Review Unit 1 and Unit 2 – dado – (6274) 10 1. 67 C 2. 136 C 3. C66 4. 76 C 5. 136 C 6. C67 7. C76 8. C13 6 9. C613 10. 66 C 068 10.0 points Three isotopes of argon occur in nature – 36 38 40 18 Ar, 18 Ar, 18 Ar. Calculate the average atomic mass of argon to two decimal places, given the following relative atomic masses and the abundances of each of the isotopes: argon- 36 (35.97 amu; 0.337%), argon-38 (37.96 amu; 0.063%), argon-40 (39.96 amu; 99.600%). 1. 35.96 amu 2. 119.89 amu 3. 37.95 amu 4. 35.97 amu 5. 37.96 amu 6. None of these 7. 39.95 amu 8. 39.96 amu