SCIN131 – Week 2 Lesson Quiz (92%)

SCIN131 – Week 2 Lesson Quiz (92%) SCIN131 – Week 2 Lesson Quiz (92%) Part 1 of 3 - 36.0/ 40.0 Points Question 1 of 25 4.0/ 4.0 Points `Isotopes of two different elements could not have A. different number of protons. B. the same number of neutrons C. different number of electrons D. different number of neutrons E. it is possible they could have any of these Feedback: Topic discussed in Chapter 2 Question 2 of 25 4.0/ 4.0 Points `If a silicon atom contains 16 neutrons, what is its mass number? A. 16 B. 14 C. 28 D. 30 E. none of the above Feedback: See the periodic table and section 3.6 Question 3 of 25 4.0/ 4.0 Points A student heats 0.5585 g of iron with 0.3350 g of sulfur. She reports that she obtains 0.8792 g of iron sulfide and recovers 0.0144 g of unreacted sulfur. Show by calculation whether or not her results obey the law of conversation of mass. A. No, because the number of grams of iron(II) sulfide is less than the grams of iron and sulfur that she started with. B. No, because there is no iron left over. C. No, because the sum of the initial masses is 0.9135 g and the sum of the final masses is 0.9136 g. D. Yes, because the sum of initial masses is 0.8935 g and the sum of the final masses is 0.8936 g. E. Yes, because the percentage of iron is definitely 63.52% in the compound. Feedback: Topic discussed in Chapter 2. Question 4 of 25 4.0/ 4.0 Points Which of the following elements is a metalloid? A. B B. Si C. Sb D. Te E. all of the above Feedback: Topic discussed in Chapter 3.6 See the periodic table. Question 5 of 25 0.0/ 4.0 Points Which group contains the noble gases? A. Group 7A B. Groups 3B through 2B C. none of the above D. Group 8A E. Group 2A Feedback: Topic discussed in Chapter 3.6 Question 6 of 25 4.0/ 4.0 Points `If aluminum were to form an ion, what would its charge be? A. 2- B. 1- C. 1+ D. 2+ E. 3+ F. 3- G. It is a transition metal, so it cannot be determined without further information. Feedback: See the periodic table and section 4.7 Question 7 of 25 4.0/ 4.0 Points `Of the pairs of names and symbols below, which is incorrect? A. potassium, K B. lithium, Li C. xenon, Xe D. silver, Ag E. all of these are correct Feedback: see the periodic table Question 8 of 25 4.0/ 4.0 Points `When oxygen forms an ion, it A. loses two neutrons B. loses two protons C. gains two electrons D. all of these E. none of these Feedback: Topic discussed in Chapter 2 Question 9 of 25 4.0/ 4.0 Points `In which group are the alkali metals found? A. Group 8A B. Group 7A C. Groups 3B through 2B D. Group 2A E. none of the above Feedback: Topic discussed in Chapter 3.6 See the periodic table. Question 10 of 25 4.0/ 4.0 Points `If a nickel atom formed an ion, what charge would it have? A. 1+ B. 1- C. 2- D. 2+ E. it cannot be determined based on the information given Feedback: Topic discussed in Chapter 3.6 Please see periodic table Transition metals can have various charges, though they will all be positive. Part 2 of 3 - Part 02 40.0/ 40.0 Points Question 11 of 25 4.0/ 4.0 Points `My friend has been isolating gold foils from gold plated electronic equipment. He recently was able to take a 3.00 gram gold nugget to sell to a buyer. How many moles of gold were in his nugget? A. 0.0152 B. 197 C. 591 D. 107.9 E. 0.0278 Feedback: Good. Topic discussed in Chapter 2 Question 12 of 25 4.0/ 4.0 Points `That nasty rotten egg smell is not actually gaseous sulfur, but rather hydrogen sulfide, or more properly named hydrosulfuric acid. It is heavier than air, too, so it tends to stick around for a while to share its delectible aroma. One mole of this compound would contain: A. 2 moles of hydrogen. B. 2 moles of sulfur. C. 1 mole of hydrogen. D. 4 moles of oxygen. E. 4 moles of sulfur Feedback: Good. You have to know naming here, as well as using forumulas as a mole conversion factor. Question 13 of 25 4.0/ 4.0 Points What is the molar mass of a hydrocarbon if 5.19 × 1016 molecules of the hydrocarbon weigh 5.00 μg? A. 172 g/mol B. 431 g/mol C. 232 g/mol D. 58.0 g/mol Feedback: Great work! Topic discussed in Chapter 2 Question 14 of 25 4.0/ 4.0 Points What is the mass of 4 atom(s) of copper in grams? A. 4.22 x 10-22g B. 254.2 g C. 9.57 x 10-24 g D. 2.37 x 1021 g E. 6.022 x 1023 g Feedback: Great work! Topic discussed in Chapter 2 Question 15 of 25 4.0/ 4.0 Points `If you look closely at the mineral case in Superman Returns, you can see a chemical name given for kryptonite--sodium lithium boron silicate hydroxide with fluorine. What's interesting is that a new mineral was discovered in Serbia in 2006, and it matches this chemical composition (minus the fluorine)! Maybe you saw it on the news. It has none of the properties of kryptonite as seen in the Superman comics/movies, however. Anyway this new mineral, Jadarite, a.k.a. kryptonite, has a formula of NaLiSiB3O7(OH). How many moles of boron are in 4.80 moles of kryptonite? A. 4.80 B. 10.8 C. 14.4 D. 1.60 E. 658.4 Feedback: Good. Topic discussed in Chapter 2 Question 16 of 25 4.0/ 4.0 Points Calculate the molar mass of (NH4)2SO4. A. 63.09 g/mol B. 132.15 g/mol C. 114.11 g/mol D. 228.22 g/mol E. 118.14 g/mol Feedback: Great work! Topic discussed in Chapter 2 Question 17 of 25 4.0/ 4.0 Points `The chemical compound ammonium permanganate is mildly explosive at temps above 140 F. How many moles of oxygen are in 3.5 mol of this compound? A. 3.5 B. 4 C. 14 D. 1 Feedback: Good. Topic discussed in Chapter 2 Question 18 of 25 4.0/ 4.0 Points What is the identity of substance X if 0.380 mol of X weighs 17.5 g? A. N2O B. N2O4 C. NO3 D. NO2 Feedback: Great work! Topic discussed in Chapter 2 Question 19 of 25 4.0/ 4.0 Points `If you were holding 1 mol of calcium in your right hand and 1 mol of strontium in your left hand, which of the following would be true? A. The contents of your lef t hand would have a greater mass than the contents of your right hand. B. The contents of your right hand would have a greater mass than the contents of your left hand. C. The mass of the contents in each hand would be equal. D. There is not enough information to answer this question. Feedback: Topic discussed in Chapter 2 Question 20 of 25 4.0/ 4.0 Points `If I tell you the mass ratio of H to P in a compound is 0.0968, which of the following could it be? A. PH2. B. PH6. C. PH. D. PH3. E. none of the above Feedback: Great! Topic discussed in Chapter 2. Part 3 of 3 - Part 03 16.0/ 20.0 Points Question 21 of 25 4.0/ 4.0 Points The measure of the average kinetic energy of the particles of a substance is the: A. potential energy B. temperature C. heat D. thermal energy Feedback: Great! Energy concepts are discussed in Chapter 9.1. Question 22 of 25 4.0/ 4.0 Points The Law of Conservation of Energy states which of the following? A. Potential energy is conserved. B. Kinetic energy is conserved. C. none of these. D. Energy cannot be converted from one form to another. Feedback: Great! Energy concepts are discussed in Chapter 9.1. This is a specific heat capacity problem. Question 23 of 25 0.0/ 4.0 Points `A certain reaction is exothermic. Therefore, the reverse of this same reaction must be a(n) A. isothermal process. B. exothermic process. C. chemical change. D. endothermic process. E. none of the above Feedback: Energy concepts are discussed in Chapter 9.1. This is a specific heat capacity problem. No calculation needed, just an understanding of the concept. Question 24 of 25 4.0/ 4.0 Points `If energy input is required to make a reaction occur, it would be considered to be an A. endothermic reaction. B. exothermic reaction. C. impossible reaction. D. isothermic reaction. E. none of the above Feedback: Great! Energy concepts are discussed in Chapter 9.1. This is a specific heat capacity problem. No calculation needed, just an understanding of the concept. Question 25 of 25 4.0/ 4.0 Points `Determine which of these substances will have the highest temperature after absorbing 500.0 kJ of heat. Assume that all substances are starting at the same initial temperature and are of equal mass. A. lead, 0.128 J/g∙°C B. water, 4.18 J/g∙°C C. copper, 0.385 J/g∙°C D. ethanol, 2.42 J/g∙°C E. not enough information Feedback: Great! Energy concepts are discussed in Chapter 9.1. This is a specific heat capacity problem. No calculation needed, just an understanding of the concept.