MLS 121 Laboratory Prelim Exam questions with correct answers | updated 2024

MLS 121 Laboratory Prelim Exam questions with correct answers | updated 20245/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam Student Identification 0 of 0 points Kindly complete the data below. MLS 121 Laboratory Prelim Exam Total points 69/100 Good Day! The PRELIM examination is a 100-POINT (95 ITEMS) ONLINE EXAM that will utilize a Google Form. It is composed of Multiple Choice questions that is answerable within TWO HOURS ONLY. The examination shall cover Activities 1 and 2. The exam questionnaire shall be available for access through the Google Classrooms from 7:30 AM of FEBRUARY 22, 2021 to 11:59 PM of FEBRUARY 24, 2021. This is to ensure that you’ll be able to take the exam based on the stability of your internet access. PLEASE READ AND FOLLOW ALL INSTRUCTIONS. Requirements in answering the PRELIM EXAMINATION: 1. Fast internet connection 2. HONESTY and INTEGRITY General Instructions: 1. Read the questions carefully. Do not rush in answering this examination. 2. Tick the option corresponding to your answer in each item. 3. Each item has one answer only. Do not tick multiple answers. 4. Remember that this is a timed assessment. Deuteronomy 31:6 "Be strong and courageous. Do not be afraid or terrified because of them, for the Lord your God goes with you; he will never leave you nor forsake you." Good luck and God bless! 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam Start of Examination 0 of 0 points Input the Time and Date started. Time MM DD YYYY Examination Proper 69 of 100 points INSTRUCTIONS: Choose the letter of the CORRECT answer for each item. Some items are worth 2 points. Last Name, First Name Middle Initial * Class Code * Time Started * Date Started * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 A. I only B. I and III only C. II and IV only D. I, III, and IV 1. Considering the bond formed for MgO and NaCl, which among the two is easier to use to conduct electricity? Choose among the given choices the answer with correct explanation. I – NaCl because ions of NaCl is easier to separate than MgO II – MgO because ions of MgO are easier to separate than NaCl III – NaCl because the atoms are bonded by a single electrostatic charge IV - MgO because the atoms are bonded by a single electrostatic charge V – NaCl because the atomic sizes are smaller, thus easier to separate * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 0/1 A. Cathode B. Anode C. No change D. None from the choices Correct answer A. Cathode 0/1 A. The electrons given will just be deposited in the sea of electrons with nowhere to go B. The electrons given will occupy the space of the electrons that were pushed C. The electrons given will not flow to the metal because of repulsion D. The electrons given will travel to the other end through the proton movement. 2. When a solution with a dipole moment is placed in an electrical field, the molecules tend to orient themselves with the electrical field. With this observation, to what electrode will the partially negative end of a dipole molecule point to when an electric current is passed in this type of solution? * 3. Metals are bonded by metallic bond, that is protons in a sea of electrons which give them their characteristic conductivity. If the electric current flows from one end to the other end using a copper wire to bridge the gap, the extra electron given through the electric current will cause the sea of electrons in the copper to? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam Correct answer B. The electrons given will occupy the space of the electrons that were pushed 1/1 A. B. c. D. None of the above 4. Assume substances which are composed by the molecules below. Which among the choices you think will have the highest melting and boiling point? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 0/1 A. I and III only B. II and III only C. I, III, and V only D. II, III, and V only Correct answer B. II and III only 5. The polarity of a molecule is associated with the factors below. Choose ALL that apply. I - equal sharing of bonding electron II - unequal sharing of bonding electron III - large electronegativity difference of the atoms involved IV - no difference in the electronegativity of the atoms V - each atom has a net negative or positive charge * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 A. I and III only B. II and III only C. I and IV only D. I, II, and III only 6. Water is a polar compound which easily dissociates the atoms of NaCl into separate ions in a solution. How is this possible since Ionic bond is a strong bond? Choose ALL that apply. I - The partially negative oxygen surrounds the sodium cation, hydrating it. II - Oxygen dissociates from hydrogen, and is attracted to the chloride cation. III -The partially positive hydrogen is attracted to the chloride anion, hydrating the ion. IV - The partially positive hydrogen is attracted to the sodium anion, hydrating the ion. * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 0/1 A. The acid does not dissociate into separate ions B. Weak acids produce less H+, thus weak conductors of electricity C. The molecules are bonded covalently and not ionically D. Strong acids produce less H+, thus weak conductors of electricity Correct answer B. Weak acids produce less H+, thus weak conductors of electricity 7. Acetic acid (CH3COOH) easily forms a solution with water, but unlike NaCl, it cannot seem to be a good conductor of electricity. Why is this so? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 8. Distance of atoms from each other (only an example): 0/1 MgO = 2 nm and the bond length/distance is 1nm; NaCl = 3 nm and the bond length/distance is 1nm Considering the information above, choose the CORRECT descriptions of ionic bonding in MgO. I – The closer atoms of MgO creates stronger attraction than of the NaCl II – The closer atoms of MgO creates repulsion of the atomic nuclei III – The higher charge difference of MgO creates stronger bond than of NaCl IV – The higher charge difference of MgO creates stronger repulsion V – The more lent and borrowed electrons between atoms of MgO attributed to stronger attraction VI - The more lent and borrowed electrons between atoms of MgO attributed to stronger repulsion * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam A. I, III, and V only B. II, IV, and V C. I, III, V, and VII D. II, III, VI, and VII Correct answer C. I, III, V, and VII 1/1 A. I and III only B. I and II only C. I, II and IV D. I, III, and IV VII – the atom size of MgO is relatively smaller than of NaCl, resulting to stronger bond 9. Which among the following choices are true of molecules or compounds bonded through ionic bond? I – tend to crack when enough pressure is applied II – potential energy decreases gradually as the temperature gradually increases III – kinetic energy increases immediately even as the heat is just starting IV – melted compound will allow electricity to pass * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 A. None, it does not form covalent bonds. B. 2 C. 3 D. 4 1/1 A. A giant lattice B. A simple molecule C. A giant molecule D. delocalized electrons 1/1 A. MgO2 B. MgS2 C. MgF2 10. How many covalent bonds does carbon form? * 11. The structure of ionic bonding is associated with __________. * 12. Magnesium is in group 2 in the periodic table. Which of the following formulas for magnesium compounds is correct? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam D. Mg2O 0/1 A. Ions in its structure are in fixed positions. B. It contains no free electrons. C. It has a giant covalent molecular structure. D. Ions in its structure only have single negative and single positive charges. Correct answer A. Ions in its structure are in fixed positions. 1/1 A. It has a giant ionic structure with strong electrostatic attraction between ions. B. It has a giant covalent structure with strong covalent bonds between atoms. C. It has a simple molecular structure with weak forces between molecules. D. It has a giant metallic structure with strong attraction between cations the electron sea. 13. Why does a sodium chloride UNABLE conduct electricity in its solid form? * 14. Which of the following statements explains why silicon dioxide has a high melting point? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 A. Brass B. Copper C. Carbon (graphite) D. Carbon (diamond) 1/1 A. MgCl2(aq) B. Mg(s) C. MgCl2(l) D. Mg(l) 1/1 A. Strong intermolecular forces B. Strong covalent bonds C. Strong electrostatic attraction 15. Which of the following substances does not conduct electricity? * 16. Which of the following samples does NOT contain freely-moving ions? * 17. Which of the following explains why a substance has a high melting point? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam g D. Attraction of ions and delocalized electrons. 1/1 A. Sulfur dioxide B. Sodium oxide C. Silver oxide D. Strontium oxide 0/1 A. Melting point determination is achieved through an exothermic reaction. B. The boiling point of water increases as the volume of water sample decreases. C. The change in the color of iodine crystal after sublimation is a chemical property. D. The density of water depends on the temperature of the water sample. Correct answer D. The density of water depends on the temperature of the water sample. 1/1 A. Carbon monoxide 18. Which of the following does not contain ionic bonds? * 19. Which statement is TRUE statement about properties of matter? * 20. Which of the following molecules has the highest dipole moment? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam B. Xenon tetraiodide C. Boron trifluoride D. Carbon tetrachloride 1/1 A. The solution becomes saturated and hypertonic. B. Water will not completely dissolve the solutes. C. Solutes will form an insoluble precipitate. D. The solubilization process will equilibrate 1/1 A. Completely ionized substances are strong electrolytes with high conductivity B. Completely ionized substances are weak electrolytes with low conductivity C. Partially ionized substances are strong electrolytes with low conductivity D. Partially ionized substances are weak electrolytes with high conductivity 1/1 A. Strong electrolytes furnish more ions and increases conductivity. B. Partial ionization of electrolytes would yield an increased conductivity. C Ionization of an electrolyte has a negligent effect on conductivity 21. An aqueous solution is prepared by adding 2 grams of solute in one liter of water. If more water is added into this solution, what will happen? * 22. Which of the following statements is CORRECT about conductivity? * 23. How does the nature of electrolytes affect conductivity? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam C. Ionization of an electrolyte has a negligent effect on conductivity. D. Ionization of an electrolyte will increase resistance. SITUATION: A line graph shows the solubility rate (mg/dL) of three solutes when temperature is increased by increments of 10oC (degrees Celsius). The first line (purple) shows the solubility rate of Solute A in ethyl alcohol. The second line (orange) illustrates the solubility of Solute B. The third line represents the solubility of Solute C. Use this situation to answer the next seven items. 1/1 A. Solute A B S l t B 24. Based on this information, which solute is the most polar? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam B. Solute B C. Solute C D. Any of the solutes. 1/1 A. Solute A B. Solute B C. Solute C D. Any of the solutes. 0/1 A. The trend will show a negative slope. B. The trend will show a positive slope. C. The slope will still stay the same. D. The slope becomes zero. Correct answer B. The trend will show a positive slope. 1/1 A. The slope will increase. 25. Which solute is the least polar? * 26. What will happen to the trend if the temperature will be decreased? * 27. What will happen to the slope of each line if the solvent becomes less polar? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam B. The slope will decrease. C. The slope stays the same. D. The slope becomes zero. 0/1 A. The slope will increase. B. The slope will decrease. C. The slope stays the same. D. The slope becomes zero. Correct answer C. The slope stays the same. 1/1 A. Solubility increases. B. Solubility decreases. C. Solubility stays the same. D. All are valid options. 28. If the atmospheric pressure is increased, what will happen to the slope of each line? * 29. Assuming that the solutes are gases, what will happen if atmospheric pressure will be increased? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 A. Solubility increases. B. Solubility decreases. C. Solubility stays the same. D. All are valid options. 1/1 A. Octahedral B. Trigonal planar C. Trigonal pyramidal D. Trigonal bipyramidal 1/1 A. Bent B. Tetrahedral C. Trigonal planar 30. Again, assuming that the solutes are gases, what will happen if the atmospheric pressure will be decreased? * 31. What is the geometry of phosphorus pentafluoride? * 32. What is the MOST likely shape of a compound with 4 electron pairs, where 1 pair of these electrons is a lone pair? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam g p D. Trigonal pyramid 1/1 A. Octahedral B. Tetrahedral C. Trigonal planar D. Trigonal pyamidal 1/1 A. Octahedral B. Tetrahedral C. Trigonal planar D. Trigonal pyamidal Option 5 1/1 A. Bent B. Tetrahedral 33. What is the geometry of ammonia? * 34. What is the geometry of sulfur hexalfuoride? * 35. What is the MOST likely shape of a compound with 3 electron pairs, where 1 pair of these electrons is a lone pair? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam C. Trigonal planar D. Trigonal pyramid 1/1 A. Octahedral B. Tetrahedral C. Trigonal planar D. Trigonal pyramidal 1/1 A. Bent B. Tetrahedral C. Trigonal planar D. Trigonal pyramid 1/1 A. Octahedral B. Tetrahedral C Trigonal planar 36. What is the geometry of boron trifluoride? * 37. What is the MOST likely shape of a compound with 4 electron pairs, where 2 pairs of these electrons are lone pairs? * 38. What is the geometry of methane? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam C. Trigonal planar D. Trigonal bipyramidal 0/1 A. Linear B. Seesaw C. T-shape D. Trigonal bipyramid Correct answer A. Linear 1/1 A. Bent B. Linear C. Tetrahedral D. Trigonal planar 39. What is the MOST likely shape of a compound with 5 electron pairs, where 4 pairs of these electrons are lone pairs? * 40. What is the MOST likely shape or geometry of a polar molecule with an electronegativity difference of 1.7 that shall react as a non-polar compound? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 0/1 A. Representation 1 B. Representation 2 C. Representation 3 D. Representation 4 Correct answer C. Representation 3 41. Which representation gives information about the net charge of the molecule? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 A. Representation 1 B. Representation 2 C. Representation 3 D. Representation 4 42. Which representation gives information on the distribution of electron density? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 0/1 A. Representation 1 B. Representation 2 C. Representation 3 D. Representation 4 Correct answer D. Representation 4 43. Which representation provides an information on the molecular shape? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 0/1 A. Representation 1 B. Representation 2 C. Representation 3 D. Representation 4 Correct answer C. Representation 3 44. Which representation provides an information on the bond dipole of the molecule? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 0/1 A. Representation 1 B. Representation 2 C. Representation 3 D. Representation 4 Correct answer C. Representation 3 1/1 A. Tetrahedral B. Square planar C. Octahedral 45. Which representation provides an information on the atomic composition of the molecule? * 46. Based on the representations, what is the geometry of the molecule? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam D. Linear 0/1 A. The molecule has a dipole moment. B. The molecule exhibits asymmetry. C. The molecule exhibits bond dipole. D. The molecule dissolves in water. Correct answer C. The molecule exhibits bond dipole. 0/1 A. Bonding sigma molecular orbitals B. Bonding pi molecular orbitals C. Antibonding sigma molecular orbitals D. Antibonding pi molecular orbitals Correct answer A. Bonding sigma molecular orbitals 47. What is a CORRECT description of the property of this molecule? * 48. Based on the molecular structure, there are four covalent bonds. The representations imply that the covalent bonds are: * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 0/1 A. The substance is hydrophobic. B. The substance is hydrophilic. C. The substance is charged. D. The substance is polar. Correct answer A. The substance is hydrophobic. 0/1 A. Hydrogen bond B. Dipole-dipole interactions C. Van der Waals interaction D. Covalent bond Correct answer C. Van der Waals interaction 49. Based on the molecular properties provided by the representations, what is an expected bulk property of the substance comprised by this molecule? * 50. What type of intermolecular forces of attraction is predominant in a substance composed of this molecule? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 2/2 A B C D 51. Which of the following is a non-polar molecule? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 0/2 A B C D Correct answer C Which of the following is a polar molecule? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 2/2 A B C D 53. Which of the following is a polar molecule? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 2/2 A B C D 54. Which of the following is a non-polar molecule? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 2/2 A B C D 55. Which of the following is a non-polar molecule? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 A. Representation I B. Representation II C. Representation III D. Representation IV 0/1 A. Polar B. Slightly polar C. Nonpolar D. Slightly nonpolar Correct answer C. Nonpolar 56. Which of the representations above does NOT belong to the group? * 57. What is the polarity of your answer in item 56? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 A. Polar B. Slightly polar C. Nonpolar D. Slightly nonpolar 1/1 A. Red B. Green 58. What is the polarity of the illustration’s group (excluding your answer for number 56)? * 59. Based from the illustrations what color indicates high polarity? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam C. Blue D. Yellow 1/1 A. I, II, III, IV B. IV, III, II, I C. II, IV, I, III D. III, I, IV, II 1/1 A B C D 60. Arrange the molecules according to decreasing molecular polarity. * 61. It is used to remove atoms in a molecular structure. * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam E 1/1 A B C D E 1/1 A B C D E 62. It is used to position the molecule in a specific location in the interface. * 63. It is used to delete a molecule in the interface of MolView. * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 A B C D E 1/1 A B C D E 64. This icon is used to highlight a specific portion of a molecule, or a molecule itself. * 65. It is used to show the atoms based on colors. * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 A B C D E 1/1 A B C D E 66. It is used to show the forward orientation of a molecule. * 67. This icon is used to indicate the charge of a bromine ion. * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 A B C D E 1/1 A B C D E 68. It is used to illustrate the presence of a pi bond in a molecular structure. * 69. It is used to draw a single covalent bond in a molecule. * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 A B C D E 0/1 A 70. This icon is used to indicate the charge of a sodium ion. * 71. Based on the graphs shown below, which of the two labelled choices demonstrates the production of water and oxygen from hydrogen peroxide with the action of the enzyme catalase? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam B Correct answer B 0/1 chemical energy; exothermic heat energy; exothermic radiant energy; endothermic nuclear energy; endothermic Correct answer heat energy; exothermic 1/1 The raisin will float. The raisin will sink. The raisin will remain suspend in the middle of the container. The raisin will bounce up and down. 72. In the experiment involving the interaction of activated yeast, hydrogen peroxide and dish soap. There is the evolution of gas. Along with it is the release of energy. Which among the following choices demonstrate the correct pairing of observations? * 73. Buoyant force and the force of gravity are two opposing forces that act on objects immersed in a liquid. If a large piece of raisin is dropped into a glass of an unknown liquid. What will be the expected result if gravity and density overcome the buoyant force? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 The diver will demonstrate positive buoyancy and float. The diver will demonstrate negative buoyancy and sink. The diver will demonstrate neutral buoyancy and remain in their position. None of these. This will depend on the amount of force gravity and their own mass are applying. Option 5 1/1 The diver will start rising to the surface of the water. The diver will remain at the bottom. The diver will remain suspended in the water. None of these. This will depend on the amount of force gravity and their own mass are applying. 74. Scuba divers are known to use buoyancy control devices in order to manage their way in the sea. What will be the result if a diver inflates his buoyancy control device and displaces more water? * 75. Scuba divers utilize lead weights to aid in their descent at the start of their dive. However, they still use their buoyancy control devices to control their movement up and down the body of water they are exploring. What will be the result if a diver deflates his buoyancy control device? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 A. The balloon will pop. B. The balloon will participate in a combustion reaction. C. The balloon will roll toward the lemon peel. D. Nothing will happen. 76. In the process of chemically treating rubber to increase tensile strength, there is the eventual formation of disulfide bridges. Suppose that you squeezed a lemon peel on a balloon containing this type of chemically treated rubber, what will be the expected result? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 A. The strip will dissolve. B. The strip will float. C. Nothing will happen. D. There will be the movement of electrons from one substance to another. 1/1 A. Polarity affects the miscibility of substances 77. If you are to expose a small strip of polysisoprene in a beaker of the substance shown below. What will be the expected result after a few minutes of their interaction? * 78. Which of the following choices is consistent with the working principle involving a rubber balloon popping when an orange peel is squeezed onto it? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam B. Intermolecular forces of attraction affect the miscibility of substances C. Polar molecules have the capability to break up groups of attracted polar molecules through dipole interactions D. Substances with relatively the same polarity will dissolve into each other. 0/1 A. The electron density pulled towards the hydrogen atoms are attracted to the charged comb. B. The partially positive end of the water molecules is attracted to the charged comb. C. Both A and B D. Neither A nor B Correct answer B. The partially positive end of the water molecules is attracted to the charged comb. 1/1 A. Electrostatic forces of the oppositely charged particles will cause the attraction of the two objects. B. Electrostatic forces of the oppositely charged particles will cause the repulsion of the two objects. C. Strong attractive forces will cause the soda can to warp. D. None of these 79. Consider the following situation: You rapidly rubbed a comb against a carpet on a hot summer day. You then positioned said comb near a faint stream of water from a faucet. What will be the most probable explanation to your expected result? * 80. Consider the following situation: You rubbed a balloon against your wool sweater. You then placed the balloon near an empty soda can. What will be the most probable explanation to your expected result? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 A. One element replaces another in a compound B. There is an exchange of two species in the compounds. C. A compound is broken down into simpler substances. D. The reactants synthesize one new product. 1/1 A. It lowers the activation energy needed to be reached in order for the reaction to occur. B. It increases the activation energy needed to be reached in order for the reaction to occur. 81. What statement correctly describes the type of chemical reaction involved in the given equation? * 82. What correctly describes the action of catalase in this situation? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam C. It combines with hydrogen peroxide to form new substances. D. It is consumed by hydrogen peroxide to form the products water and oxygen gas. 0/1 A. First statement is true. Second statement is false. B. First statement is false. Second statement is true. C. Both of the statements are true. D. Both of the statements are false. Correct answer C. Both of the statements are true. 0/1 A. First statement is true. Second statement is false. B. First statement is false. Second statement is true. C. Both statements are true. D. Both statements are false. Correct answer 83. Analyze the following statements: A person free-diving will experience greater amounts of pressure exerted by water as he gains depth. An object’s weight will remain constant when immersed in a body of water with a given amount of buoyant force. * 84. Analyze the following statements: A chemical reaction is involved when a balloon popped due to the exposure of its latex components with limonene. The structure of limonene involves an equal distribution of electron across its structure. * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam B. First statement is false. Second statement is true. 0/1 A. First statement is true. Second statement is false. B. First statement is false. Second statement is true. C. Both statements are true. D. Both statements are false. Correct answer B. First statement is false. Second statement is true. 1/1 A. Peptide bonds B. Induced Dipole-Dipole ionic bonds C. Disulfide bonds D. Salt bridges 85. Analyze the following statements: All types of solutes become more soluble in a solvent as the temperature increases. The solubility of gases has a direct relationship with a system’s pressure. * 86. Rubbers are subjected to vulcanization to make it more elastic, more resilient and more durable. These properties are achieved by cross linking the long rubber molecules. What type of bond is formed between the rubber molecules? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 0/1 A. Temperature B. Atmospheric pressure C. Agitation D. None of the above Correct answer B. Atmospheric pressure 1/1 A. H2O2 emits heat upon standing to loosen the intermolecular forces between the Hydrogen and oxygen. B. As heat is absorbed by the H2O2, it decomposes rapidly into hydrogen and oxygen. C. The container felt hot, as water and oxygen are being produced from the hydrogen peroxide degradation. D. Hydrogen peroxide absorbs thermal heat to induce its decomposition process. 87. Using carbonated drinks as an example, which of the following factors doesn’t affect gas solubility in liquid? * 88. Which of the following statements best portray the exothermic process of the elephant toothpaste experiment? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 A. The balloon will gain more electrons from the wool, then, induce the charges to rearrange in the wall. B. The wool is neutrally charged, so no movement of electron is observed. C. The balloon will stick to the wall, as the negatively-charged wall attracts the balloon. D. The wool will gain electrons from the balloon, so balloon will not stick to the wall afterwards 89. What will happen when balloon is exposed to the wall after rubbing to the wool? Refer to the picture. * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 0/1 A. The wall will gain electrons from the balloon, so balloon will not attract water afterwards. B. The wall will transfer more electrons to the balloon, so a stronger pull will be observed C. The balloon maintains its electron-rich state, and attracts the positively-induced water. D. The balloon shifts to positive charge after touching the wall, so it attracts the negative-induced water. Correct answer C. The balloon maintains its electron-rich state, and attracts the positively-induced water. 90. What will happen when you expose the rubbed balloon to water after touching the wall? Refer to the picture. * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 1/1 A. O2(g) B. H2(g) C. CO2(g) D. H2O(g) 0/1 A. Atmospheric pressure B. Dissociation constant C. Solubility of the gas D. Concentration of solute Correct answer D. Concentration of solute 91. What gas is inside the effervescence in a soda can? * 92. The dissociation of carbonic acid in a soda is influenced by the following EXCEPT * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam 0/1 A. Gas molecules transform into a liquids state. B. Gas molecules interact with water molecules. C. Gas molecules form covalent bonds with water. D. New gas molecules are produced in the system. Correct answer B. Gas molecules interact with water molecules. 1/1 A. Naringin B. Limonene C. Squalene D. Carotene 1/1 A. Addition of disulfide bridges 93. When gas particles dissolve in water, what is expected to happen? * 94. What substance is present in an orange peel, causing the polymer in a balloon to pop? * 95. Some balloons do not pop when squeezed with lemon or orangepeel extract. What process prevents this from happening? * 5/20/22, 11:48 AM MLS 121 Laboratory Prelim Exam B. Formation of dipole interactions C. Adding of saturated salt solution D. Addition of a waxy material End of Examination 0 of 0 points Input the Time and Date ended. Time MM DD YYYY This form was created inside of Saint Louis University, Inc.. Time Ended * Date Ended * Forms