MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

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1 BIO130 Pre-Requisite Chemistry and Metric System Take Home Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Transfer your final answer to the answer sheet. 1) The smallest stable units of matter are A) atoms. B) electrons. C) neutrons. D) molecules. E) protons. 2) When electrons are transferred from one atom to another, and the two atoms unite as a result of the opposite charges, A) a molecule is formed. B) an ionic bond is formed. C) a hydrogen bond is formed. D) an ion is formed. E) a covalent bond is formed. 3) A compound that can remove or replace hydrogen ions to stabilize ph is a(n) A) enzyme B) buffer C) acid D) free radical E) isotope 4) There are 2.2 kg in one pound. How much does a five pound bag of flour weigh in grams? A) 11 g B) 1.1 X 10 4 g C) 1,100 g D) 1.1 X 10-4 g E) 1.1 X 10-2 g 5) In dehydration synthesis reactions, compounds or molecules A) release water molecules as bonds are formed. B) convert atmospheric hydrogen and oxygen to water. C) gain water molecules as bonds are formed. D) convert water molecules to hydrogen and oxygen. E) gain electrons. 6) The average urine output for an adult is ~2.0 L/day. Which of the following is equivalent? A) ~2000 ml per day B) ~83 ml per hour C) ~200 dl per day D) All of the above. E) A and B only. 1

2 7) An ion or molecule that contains unpaired electrons in its outermost shell is called A) radioactive B) an isotope C) nonpolar D) a free radical E) a cation 8) How many millimeters in a centimeter? A) 100 B) 10 C) 1,000 D) 1 E) 10,000 9) Which element commonly has only a proton as its nucleus? A) carbon B) oxygen C) hydrogen D) helium E) magnesium 10) Which of the following statements about water is not correct? A) is responsible for much of the mass of the human body B) can dissolve many substances C) can engage in hydrogen bonds D) is composed of polar molecules E) has a relatively low heat capacity 11) The average adult male human heart weighs about 300 g. Which of the following is equivalent? A) 3000 dg B) 0.3 kg C) 3.0 X 10 5 mg D) all of the above. E) B and C only. 12) The molecule O2 is known as A) oxide. B) organic. C) oxygen. D) acetic acid. E) none of the above 13) Which of the following is an acid? A) H 2 O H + + OH - B) NaOH Na + + OH - C) NaCl Na + + Cl - D) C 2 H 5 OCOOH H + + C 2 H 5 OCOO - E) All of the above 2

3 14) Which one of the following statements is not correct about the reaction H2 + Cl2 2 HCl? A) HCl is the product. B) One molecule of hydrogen contains two atoms. C) Two molecules of HCl are formed in the reaction. D) This reaction requires water. E) H2 and Cl2 are the reactants/substrates. 15) Which state of matter has an indefinite shape and is compressible? A) liquid B) solid C) gas D) mass E) energy 16) Isotopes of an element differ in the number of A) electron clouds. B) protons in the nucleus. C) electrons in energy shells. D) electrons in the nucleus. E) neutrons in the nucleus. 17) The molecule CO2 is known as A) carbon monoxide. B) carbonized oxygen. C) carbon dioxide. D) carbon oxide. E) carbonated oxygen. 18) All atoms of a particular type that have the same number of protons are called A) an atom B) an isotope C) an element D) energy E) matter 19) How many liters are in 234 ml? A) L B) 2.34 L C) 23.4 L D) 2.34 X 10 3 L E) 2.34 X 10-3 L 20) All of the following are true concerning enzymes, except that they A) are specific for only one type of chemical reaction. B) are proteins. C) are consumed during the reaction. D) function as biological catalysts. E) lower the activation energy required for a reaction. 21) Which of the following is not a cation? A) K+ B) Cl- C) Na+ D) Mg2+ E) Ca2+ 3

4 22) If a substance has a ph that is greater than 7, it is A) acidic. B) neutral. C) a salt. D) a buffer. E) alkaline. 23) Which has the greater concentration of hydrogen ions, a substance with a ph of 5 or a substance with a ph of 4? A) A ph of 4 is greater. B) A ph of 5 is greater. C) They are both equal; 4 and 5 are relative values. 24) In a rough estimate, approximately how many liters are in a gallon? A) 4 B) 2 C) 1 D) 1.5 E) 10 25) The capacity to do work is the definition of A) an isotope. B) an element. C) mass. D) matter. E) energy. 26) Identify which of the following is both an anion and a compound: A) NaCl B) Na+ C) HCO 3 - D) K+ E) Cl- 27) Which of the following statements about hydrogen bonds is false? A) Hydrogen bonds can hold the shape of large molecules. B) Hydrogen bonds can form between neighboring molecules. C) Hydrogen bonds require pre-existing polar covalent bonds. D) Hydrogen bonds are very strong attractive forces between all hydrogen atoms and any negatively charged atoms. E) Hydrogen bonds are responsible for some of the properties of water. 28) Normal human body temperature is reported to be 98.6 F. What is this in C? A) 42 B) 37 C) 100 D) 32 E) 4 29) When atoms complete their outer electron shell by sharing electrons, they form A) ionic bonds. B) anions. C) covalent bonds. D) cations. E) hydrogen bonds. 30) In hydrolysis reactions, compounds or molecules react with A) carbon, causing decomposition. B) water, causing synthesis. C) hydrogen, causing decomposition. D) glucose, causing decomposition. E) water, causing decomposition. 4

5 31) Identify the following reaction: Sucrose + H2O glucose + fructose A) Dehydration synthesis reaction B) Reversible reaction C) Exchange reaction D) Hydrolysis reaction E) Covalent reaction 32) The "atomic weight" of an atom reflects the average number of A) neutrons. B) electrons. C) protons + neutrons. D) protons. E) protons + neutrons + electrons. 33) Which of the following is the type of bond holding K + and I - ions in KI? A) Covalent bond B) Ionic bond C) Hydrogen bond 34) Chemical reactions that yield energy, such as heat, are said to be A) exergonic. B) endergonic. C) thermonuclear. D) activated. E) neutral. 35) How many valence electrons will there be for a neutral atom with the atomic number 15? A) 1 B) 2 C) 5 D) 7 E) impossible to tell without more information 36) Which of the following is the type of bond between molecules of water in a beaker of water? A) Ionic bond B) Hydrogen bond C) Covalent bond 37) In chemical notation, the symbol Ca2+ means. A) two calcium atoms B) a calcium ion that has gained two protons C) a calcium ion that has lost two electrons D) a calcium ion that has lost two protons E) a calcium ion that has gained two electrons 38) The weakest bond between two atoms is the bond. A) polar B) hydrogen C) covalent D) ionic E) nonpolar 5

6 39) You measure a muscle cell to be 0.2 mm long. How long is it in um? A) 2 B) 20 C) 200 D) 0.2 X 10-3 E) 2 X ) Five grams is equivalent to A) 5,000 kg B) 5,000 ug C) 5,000 cg D) 5,000 mg E) 5 cc 41) Of the following choices, the ph of the solution that is not at all acidic is A) 4.5. B) 6.0. C) 2.3. D) 1.0. E) ) What is the type of weak bond between the hydrogen of one molecule and the nitrogen of another molecule? A) Hydrogen bond B) Covalent bond C) Ionic bond 43) AB A + B is to decomposition as A + B AB is to A) exchange. B) metabolism. C) replacement. D) synthesis. E) combustion. 44) The type of bond produced when atoms share pairs of electrons is a(n) A) covalent bond. B) hydrogen bond. C) ionic bond. D) all of the above. E) A and B only. 45) The mass number represents the number of A) electrons in an ion. B) protons + neutrons. C) protons in an atom. D) neutrons + electrons. E) neutrons in an atom. 46) The chemical behavior or reactivity of an atom is determined by A) the mass of the nucleus. B) the outermost electron shell. C) the number of neutrons. D) the size of the atom. E) the number of protons. 6

7 47) All of the following are properties of water EXCEPT: A) water is a product of dehydration synthesis. B) water is formed by nonpolar covalent bonds. C) many solutes will dissolve in water to form solutions. D) water is liquid at a wide range of temperatures. E) hydrogen bonds form the connection between water molecules. 48) In a molecule of nitrogen, three pairs of electrons are shared by two nitrogen atoms. The type of bond that is formed is an example of a(n) A) triple covalent bond. B) polar covalent bond. C) hydrogen bond. D) double divalent bond. E) single trivalent bond. 49) An atom that is emitting subatomic particles or radiation is called A) a radioisotope. B) a neutron. C) nuclear. D) atomic. E) an ion. 50) If an isotope of oxygen has 8 protons, 10 neutrons, and 8 electrons, its mass number is A) 12. B) 26. C) 18. D) 8. E) ) Identify the following reaction: HCl + NaHCO3 NaCl + H2CO3 A) Exchange reaction B) Ionic reaction C) Reversible reaction D) Hydrolysis reaction E) Dehydration synthesis reaction 52) Of the list below, which has the highest concentration of hydroxide ions? A) ph 14 B) ph 2 C) ph 7 D) ph 10 E) ph 1 53) Divide the following and choose the correct answer: 5.25 X 10 8 / 2.75 X 10-3 A) 1.91 X 10 5 B) 1.91 X 10-5 C) 1.91 X 10 8 D) 1.91 X E) 1.91 X ) 1,500 meters is equivalent to how many kilometers? A) 1.5 X 10 6 B) 1.5 C) 150 D) 1.5 X 10 3 E) 15,000 7

8 55) Most forms of carbon have the atomic number 6 and a mass of 12. An atom of carbon that has six protons and seven neutrons is an example of a(n) A) dalton. B) isotope. C) radioactive isotope. D) compound. E) molecule. 56) The average adult produces 2 million new erythrocytes (red blood cells) per second. How many erythrocytes are made per day (24 hours)? A) 1.7 X 10 8 B) 1.7 X 10 6 C) 1.7 X10 11 D) 2.9 X 10 6 E) 2,000 57) 5 cm is equivalent to A) 0.05 m B) 50 mm C) 50,000 um D) All of the above E) A and B only 58) If a pair of electrons is unequally shared between two atoms, a(n) occurs. A) single covalent bond B) hydrogen bond C) polar covalent bond D) double covalent bond E) triple covalent bond 59) Which of the following are responsible for the reactivity of atoms with each other in chemical reactions? A) neutrons B) valence electrons C) atomic nuclei D) protons E) radioactive isotopes 60) Ionic bonds are formed when A) hydrogen forms bonds with negatively charged atoms. B) two or more atoms lose electrons at the same time. C) atoms share electrons. D) a pair of electrons is shared unequally by two atoms. E) electrons are completely transferred from one atom to another. 8

9 61) The reaction A + B + energy AB is an example of a(n) A) decomposition reaction. B) exergonic reaction. C) exchange reaction. D) endergonic reaction. E) equilibrium reaction. 62) The innermost electron shell in an atom holds up to electrons. A) 1 B) 8 C) 4 D) 6 E) 2 63) If an element is composed of atoms with an atomic number of 6 and a mass number of 14, then a neutral atom of this element contains A) 6 electrons. B) 8 protons. C) 8 neutrons. D) both A and B E) both A and C 64) A common definition of matter is A) the weight of an object. B) the amount of energy contained in the chemical bonds of a substance. C) anything that has mass and takes up space. D) chemistry. E) something that can change directly from a solid to a gas. 65) Ions with a + charge are called A) anions. B) cations. C) radicals. D) isotopes. E) positrons. 66) Which of the following statements is not true about the neutral atom 12 6 A) It has 6 electrons orbiting the nucleus. B) It has equal numbers of protons and electrons. C) It has 12 neutrons in its nucleus. D) It has equal numbers of protons and neutrons. E) It has 6 protons in its nucleus. C (atomic number 6, mass 12)? 67) Each of the following is an example of an inorganic compound or molecule, except A) oxygen. B) glucose. C) acids. D) water. E) salts. 68) Elements that have atoms with full outer shells of electrons A) will form many compounds. B) will normally form anions. C) frequently form hydrogen bonds. D) are inert. E) will normally form cations. 9

10 69) What is the number 763,000 in standard scientific notation? A) 7.63 X 10-5 B) 7.63 X 10 5 C) D) 76.3 X 10 4 E) ) Which of the following is equivalent to 1cc A) 1 mm B) 1 g C) 1 cm D) 1 ml E) 1 L 71) During ionization, water molecules disrupt the ionic bonds of a salt to produce a mixture of ions. These ions can carry an electrical current and so are called A) cations. B) anions. C) electrolytes. D) counterions. E) acids. 72) To convert a microgram quantity to a gram quantity A) multiply by B) divide by C) multiply by 1,000,000. D) divide by 1,000,000. E) divide by ) Which of the following is an uncharged particle found in the nucleus of an atom? A) neutron B) isotope C) proton D) electron E) element 74) H2O is, or is an example of a(n) A) molecule. B) compound. C) water molecule. D) all of the above. E) B and C only. 75) Which of the following is a base? A) C 2 H 5 OCOOH H + + C 2 H 5 OCOO - B) HCl H + + Cl - C) NaCl Na + + Cl - D) NaOH Na + + OH - E) All of the above 76) The "atomic number" of an atom is determined by the number of it has. A) protons B) protons + electrons C) protons + neutrons D) neutrons E) electrons 10

11 77) Which of the following pairs is mismatched? A) H 2 SO 4 2H + + SO 2-4 acid B) MgSO 4 Mg 2+ + SO 2-4 salt C) KH 2 PO 4 K + + H 2 PO - 4 acid D) HF H + + F - acid E) NaOH Na + + OH - base 78) Magnesium atoms (atomic number 12) have two electrons in the outermost shell. As a result, you would expect magnesium to form ions with a charge of A) -1. B) -2. C) +2. D) +1. E) either +2 or -2 79) All of the following are true statements concerning polar covalent bonds EXCEPT: A) They involve unequal sharing of electrons. B) They contribute to the water solubility of a molecule. C) Water is an example of a molecule with this type of bond. D) They involve cations and anions. E) They occur between two atoms with significantly different sizes. 80) What are the type of bonds holding hydrogen and oxygen atoms together in the molecule of H 2 O? A) Ionic bond B) Hydrogen bond C) Covalent bond 81) A solution containing equal numbers of hydrogen ions and hydroxide ions is A) neutral. B) in equilibrium. C) basic. D) alkaline. E) acidic. 82) The reaction N2 + 3 H2 2 NH3 is an example of a(n) A) metabolic reaction. B) decomposition reaction. C) enzyme reaction. D) exchange reaction. E) synthesis reaction. 11

12 83) Water freezes at. A) 0 C B) 32 F C) 0 F D) both A and B. E) none of the above. 84) When an acid and a base are mixed together and allowed to react A) neutralization occurs. B) the products formed are water and a salt. C) a strong buffer is formed. D) all of the above. E) A and B only. 85) Which molecules will associate with water to form a solution? A) ionically bonded molecules. B) hydrophilic molecules. C) hydrophobic molecules. D) all of the above. E) A and B only. 86) Which of the following substances would be most acidic? A) urine, ph = 6 B) lemon juice, ph = 2 C) tomato juice, ph = 4 D) white wine, ph = 3 E) stomach secretions, ph = 1 87) The basic types of energy are radiant, mechanical A) chemical B) electrical C) heat D) both A and B. E) both B and C. 88) The amount of energy required to disrupt the sable configuration of atoms or molecules so that they will engage in chemical reactions is the A) catalyst. B) enzyme. C) decomposition. D) metabolism. E) activation energy. 89) What type of bond is between ions in salt? A) Hydrogen bond B) Covalent bond C) Ionic bond 12

13 90) Multiply the following and choose the correct answer: (8.1 X 10 7 ) X (3.5 X 10-3 ) A) 1.2 X 10 5 B) 1.2 X10 4 C) 2.8 X 10 4 D) 2.8 X 10 5 E) 28 X