College of Science and Technology Department of Chemistry and Forensic Science C
ID: 713486 • Letter: C
Question
College of Science and Technology Department of Chemistry and Forensic Science CHEM 1115 Chemical Calculations Exam 2-B DO NOT WRITE ON THE EXAM. Indicate your test version on your scantron fornm nd and answer each question carefully. Choose the best answer and use the scantron form for yo sers No cellphones arc allowed. . Classify the underlined matter: Sugar to put in a cup of coffee. Sugar can be classified as a(n) A) Element B) Ionic compound C) Compound D) Mixture 2. Conversion factors are used to increase the amount of a measurement. A) True B) False 3. Which of the following is a metal? A) sulfur B) oxygen C) calcium D) iodine 4. What is the total number of atoms in the compound: Al2(SO:) A) 20 B) 12 C) 3 D) 17 Give the number of protons (p), neutrons (n), and electrons (e) in a neutral atom of 131, A) 53 p, 131 n, 78 e B) 53 p, 131 n, 53e C) 78 p, 53 n, 78 e ) 53 p, 78 n, 53c Version 2 PageExplanation / Answer
1) C - Compound (as here Sugar is a disaccharide, a molecule composed of the two monosaccharides, glucose and fructose)
2) B - False
3) C - calcium (as it show all metalic characters)
4) D - 17 (two Al, Three S, Twelve O)
5) D - 53 p, 78 n, 53 e (As iodine has atomic number 53 so the no of protons is = 53. Now as the atomic number is 131 so the no of nutrons are = 78. Now the atom being nutral it also has 53 electrons)