CHEM 103 Quizzes M1: Exam - Requires Respondus LockDown Brows…  M1: Exam - Requires Respondus LockDown Browser + Webcam Due No due date Points 100 Ques ! ons 10 Time Limit 120 Minutes Requires Respondus LockDown Browser Instruc ! ons A ! empt History A " empt Time Score LATEST A ! empt 1 68 minutes 88 out of 100 Score for this quiz: 88 out of 100 Submi ! ed Sep 28 at 4:43pm This a ! empt took 68 minutes. Please read the following before beginning the exam: You must show your work for calcula " ons or give an explana " on for short answer ques " ons in order to receive credit. You may only use the methods and explana " ons provided by this course for your answers. The use of a method or explana " on that was not taught in this course is a viola " on of the Academic Integrity Policy. You MUST only use the Periodic Table provided within the exam. You MUST only use the equa " on bank that is provided within the exam. The use of printed versions of the Periodic Table and equa " on bank will be considered a viola " on of the Academic Integrity Policy. Any equa " on or constant used on an exam that is not from the equa " on bank and is di ff erent from the method taught in this course will be considered an outside source and a viola " on of the Academic Integrity Policy. During module exams you may not use any outside source of informa ! on such as the module, problem sets, notes, Internet, tutor, etc. You may ONLY copy and paste from within the exam itself, from the equa " on bank, or from the provided calculator but not from an outside source. The only items you should have in front of you are your computer, 1-2 pieces of blank scratch paper, a calculator (non-cell phone), and a pen/pencil. 10 / 10 pts Ques ! on 1 Your Answer: You may find the following resources helpful: Scien ! fic Calculator Periodic Table Equa ! on Table Complete the two problems below: 1. Convert 1005.3 to exponen " al form and explain your answer. 2. Convert 4.87 x 10 to ordinary form and explain your answer. -6 1.) 1005.3 = 1.0053 x 10 2.) 4.87 x 10 = 0.00000487 If the exponent is nega " ve the number will be smaller than 1, while if the exponent is posi " ve the number will be greater than 1. 3 -6 1. Convert 1005.3 = larger than 1 = posi " ve exponent, move decimal 3 places = 1.0053 x 10 2. Convert 4.87 x 10 =nega " ve exponent =smaller than 1, move decimal 6 places = 0.00000487 3 -6 10 / 10 pts Ques ! on 2 Your Answer: You may find the following resources helpful: Scien ! fic Calculator Periodic Table Equa ! on Table Complete the two problems below: Using the following informa " on, do the conversions shown below, showing all work: 1 $ = 12 inches 1 pound = 16 oz 1 gallon = 4 quarts 1 mile = 5280 feet 1 ton = 2000 pounds 1 quart = 2 pints kilo (= 1000) milli (= 1/1000) cen " (= 1/100) deci (= 1/10) 1. 350 pounds = ? ton 2. 0.632 m = ? cm 1.) 350 pounds x 1 ton 2000 pounds = 0.175 ton 2.) 0.632 m x 100 cm 1 m = 63.2 cm cm 1. 350 pounds x 1 ton / 2000 pounds = 0.175 ton 2. 0.632 m x 100 cm / 1 m = 63.2 cm 10 / 10 pts Ques ! on 3 Your Answer: You may find the following resources helpful: Scien ! fic Calculator Periodic Table Equa ! on Table Do the conversions shown below, showing all work: 1. 78 C = ? K 2. 248 F = ? C 3. 427 K = ? F o o o o o o 1.) From C to K we add 273. 78 C + 273 = 351K 2.) From F to C we need to Substract 32 and then Divide by 1.8. 248 F - 32 = 216 / 1.8 = 120 3.) From K to F we need to first convert from K to C and then from C to F 427 K - 273 = 154 C x 1.8 = 277.2 + 32 = 309.2 F o o o o o o o o o o o 1. 78 C + 273 = 351 K C → K (make larger) +273 2. 248 F - 32 ÷ 1.8 = 120 C F → C (make smaller) -32 ÷1.8 3. 427 K - 273 = 154 C x 1.8 + 32 = 309.2 F K → C → F o o o o o o o o o o o o o o 10 / 10 pts Ques ! on 4 Your Answer: You may find the following resources helpful: Scien ! fic Calculator Periodic Table Equa ! on Table Be sure to show the correct number of significant figures in each calcula " on. 1. Show the calcula " on of the mass of a 15.7 ml sample of glycerine with density of 1.26 g/ml 2. Show the calcula " on of the density of carbon disulfide if 20.3 g occupies 12.8 ml. 1.) To calculate mass we use the formula M= DxV. We also have 3 significant figures. M = 1.26 g/mL x 15.7 mL = 19.8 g. 2.) To calculate density we use the formula D = M / V. D = . we have 3 significant figures in the answer. 1. M = D x V = 1.26 x 15.7 = 19.8 2. D = M / V = 20.3 / 12.8 = 1.59 4 / 10 pts Ques ! on 5 Your Answer: You may find the following resources helpful: Scien ! fic Calculator Periodic Table Equa ! on Table 1. 3.0600 contains ? significant figures. 2. 0.0151 contains ? significant figures. 3. 3.0600 ÷ 0.0151 = ? (give answer to correct number of significant figures) 1.) 3. 0600 contains 3 significant figures. The zeros to the right are insignificant. the zeros in between are significant. 2.) 0.0151 contains 5 sig fig. the zeros to the le $ are significant. 3.) 3.0600 0.0151 = 203 the answer will contain 3 sig fig. 1. 3.0600 contains 5 significant figures. 2. 0.0 151 contains 3 significant figures. 3. 3.0600 ÷ 0.0151 = 202.649 = 203 (to 3 significant figures for 0.0151) 10 / 10 pts Ques ! on 6 Your Answer: You may find the following resources helpful: Scien ! fic Calculator Periodic Table Equa ! on Table Classify each of the following as an element, compound, solu " on or heterogeneous mixture and explain your answer. 1. Pepperoni Pizza 2. Potassium oxide 3. Phosphorus 1. Pepperoni Pizza is an Heterogenous mixture. It has more than 2 materials. Not present in the periodic table 2. Potassium oxide is a compound. Is not on the periodic table. 3. Phosphorus is an element present in the periodic table. 1. Pepperoni Pizza - is not on periodic table (not element) - no element names (not compound) appears as more than one substance (dough, cheese, pepperoni) = Hetero Mix 2. Potassium oxide - is not on periodic table (not element) - has two element names = Compound 3. Phosphorus - is on periodic table = Element 10 / 10 pts Ques ! on 7 Your Answer: You may find the following resources helpful: Scien ! fic Calculator Periodic Table Equa ! on Table Classify each of the following as a chemical change or a physical change 1. Grape juice ferments to wine 2. Paper burns 3. Peeling the shell from a hard-boiled egg 1. Grape juice ferments to wine. Chemical change. Can not be reversible. 2. Paper burns. Chemical change combus " on happened. Can not be reversible. 3. Peeling the shell from a hard-boiled egg Physical Change. The hard-boiled egg will s " ll be a hard-boiled egg. 1. Grape juice ferments to wine - sugar forms alcohol = chemical change 2. Paper burns - burning always = chemical change 3. Peeling the shell from a hard-boiled egg - shell is s " ll (broken) shell = physical change 10 / 10 pts Ques ! on 8 Your Answer: You may find the following resources helpful: Scien ! fic Calculator Periodic Table Equa ! on Table Show the full Nuclear symbol including any + or - charge (n), the atomic number (y), the mass number (x) and the correct element symbol (Z) for each element for which the protons, neutrons and electrons are shown - symbol should appear as follows: Z 53 protons, 74 neutrons, 54 electrons x y +/- n I 127 53 -1 53 protons = I , 74 neutrons = I , 54 electrons = (+53 - 54 = -1) = I 53 127 53 127 53 -1 8 / 10 pts Ques ! on 9 Your Answer: You may find the following resources helpful: Scien ! fic Calculator Periodic Table Equa ! on Table Name each of the following chemical compounds. Be sure to name all acids as acids (NOT for instance as binary compounds) 1. N O 2. SnO 3. HClO 2 4 2 4 1. Dinitrogen Tetraoxide 2. Tin (II) Oxide 3. Perchlorate acid 1. N O - binary molecular = dinitrogen tetroxide 2. SnO - binary ionic = " n (IV) oxide 3. HClO - nonbinary acid = perchloric acid 2 4 2 4 6 / 10 pts Ques ! on 10 Your Answer: You may find the following resources helpful: Scien ! fic Calculator Periodic Table Equa ! on Table Write the formula for each of the following chemical compounds explaining the answer with appropriate charges and/or prefixes and/or su ffi xes. 1. Iron (III) cyanide 2. Diiodine pentoxide 3. Potassium phosphide 1. Iron (III) cyanide = Fe + (CN) = Fe (CN) 2. Diiodine pentoxide = I + O I O 3. Potassium phosphide = K + P = K P 3 - - 3 2 5 = 2 5 + -3 3 1. Iron (III) cyanide - Fe , CN = Fe(CN) 2. Diiodine pentoxide - ide = binary, two I, 5 O = I O 3. Potassium phosphide - ide = binary K , P = K P +3 -1 3 2 5 +1 -3 3 #1 charge of Fe is +3 (superscript), no charge in formula of Fe(CN)3 2. di and pent need to be explained Quiz Score: 88 out of 100  Previous Next  Submission Details: Time: 68 minutes Current Score: 88 out of 100 Kept Score: 88 out of 100 7 Home Grades Modules Files Account Dashboard Courses Calendar Inbox History Student Dashboard Help