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