SCIN131 Week 2 Lesson Quiz 2

SCIN131 Week 2 Lesson Quiz 2 SCIN131 Week 2 Lesson Quiz 2 Week 2 Lesson Quiz Part 1 of 3 - 36.0/ 40.0 Points Question 1 of 25 4.0 / 4.0 Points To which family does krypton belong? • A. alkaline earth metals • B. alkali metals • C. halogens • D. noble gases • E. none of the above Feedback:Topic discussed in Chapter 3.6 Question 2 of 25 4.0 / 4.0 Points An aluminum ion, Al3+, has: • A. 13 protons and 13 electrons • B. 10 protons and 13 electrons • C. 27 protons and 24 electrons • D. 13 protons and 10 electrons • E. 16 protons and 13 electrons Feedback:Topic discussed in Chapter 2 Question 3 of 25 4.0 / 4.0 Points An oxide ion, O2-, has: • A. 8 protons and 7 electrons • B. 10 protons and 7 electrons • C. 8 protons and 9 electrons • D. 10 protons and 8 electrons • E. 8 protons and 10 electrons Feedback:Topic discussed in Chapter 2 Question 4 of 25 4.0 / 4.0 Points Who discovered the law of conservation of mass? • A. John Dalton and Antoine Lavoisier • B. John Dalton • C. none of these. • D. Albert Einstein • E. Antoine Lavoisier Feedback:Great! Topic discussed in Chapter 2. Question 5 of 25 4.0 / 4.0 Points In an atom of Ar-41, how many neutrons would there be? • A. 18 • B. 41 • C. 59 • D. 23 • E. none of the above Feedback:Topic discussed in Chapter 2 Question 6 of 25 4.0 / 4.0 Points How many electrons are in Li+? • A. 3 • B. 7 • C. 10 • D. 2 • E. 4 Feedback:Topic discussed in Chapter 2 Question 7 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 8 of 25 4.0 / 4.0 Points How many protons would be found in Sr2+ ? • A. 38 • B. 88 • C. 50 • D. 36 • E. none of the above Feedback:Topic discussed in Chapter 2 Question 9 of 25 4.0 / 4.0 Points How would you correctly write the atomic symbol of nitrogen? • A. Ni • B. Ng • C. Nt • D. N • E. none of the above Feedback:Topic discussed in Chapter 3.6 See the periodic table. Question 10 of 25 0.0 / 4.0 Points Elements that are located to the right of the zig-zag line on the periodic table, but that do not touch it, would be classified as • A. metals • B. nonmetals • C. metalloids • D. noble gases • E. none of the above Feedback:Topic discussed in Chapter 3.6 See the periodic table. Part 2 of 3 - Part 02 20.0/ 40.0 Points Question 11 of 25 0.0 / 4.0 Points The molecular formula for nicotine is C10H14N2. If an average cigarette contains 1.234 x 10-5 moles of nitrigen atoms from nicotine, how many moles of carbon are in the sample? • A. 1.234 x 10-25 • B. 10 • C. 2.468 x 10-6 • D. 6.168 x 10-5 Feedback:Topic discussed in Chapter 2 Question 12 of 25 0.0 / 4.0 Points Suppose I lay before you 8.0 gram samples each of Mg, Cs, C, and Hg. Which of these samples would contain the greatest number of moles? • A. Mg • B. Cs • C. C • D. Hg • E. They would all contain the same number of moles Feedback:Topic discussed in Chapter 2 Question 13 of 25 4.0 / 4.0 Points Silver salts have antimicrobial properties--they can kill bacteria by interfering with certain proteins. Silver nitrate used to be given in drop form to newborns to prevent them from contracting gonorrhea from infected mothers. How many oxygen atoms would be in 2.0 moles of silver nitrate? • A. 6.0 • B. 6.022 x 1023 • C. 3.61 x 1024 • D. 1.20 x 1024 Feedback:Good. Topic discussed in Chapter 2 Question 14 of 25 0.0 / 4.0 Points I recently went to the dentist for a procedure that required me to have laughing gas (nitrous oxide, or N2O). I specified that I wanted EXACTLY 1.000 x 1025 molecules of this gas delivered to me. If he was going to be my dentist, he had to prove to me he knew a little chemistry. How many grams would he have to deliver? • A. 1.100 × 103 • B. 44.01 • C. 730.9 • D. 16.61 Feedback:Topic discussed in Chapter 2 Question 15 of 25 4.0 / 4.0 Points What is the average mass of one S atom? • A. 5.32 x 10-23 amu • B. 32.07 g/mol • C. 1.93 x 1025 g • D. 32.07 amu • E. 32.07 g Feedback:Great work! Topic discussed in Chapter 2.4 Question 16 of 25 4.0 / 4.0 Points What is the molar mass of hydrogen gas? • A. 6.02 × 1023 g/mol • B. 1.00 g/mol • C. 2.00 g/mol • D. 1.20 × 1023 g/mol Feedback:Great work! Topic discussed in Chapter 2 Question 17 of 25 0.0 / 4.0 Points A given sample of a xenon fluoride compound contains molecules of a single type XeFn, where n is some whole number. Given that 9.09 x 1020 molecules of XeFn weigh 0.370 g, calculate n. • A. 3 • B. 2 • C. 1 • D. 6 • E. 4 Feedback:Topic discussed in Chapter 2.4. Question 18 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. 232 g/mol • C. 431 g/mol • D. 58.0 g/mol Feedback:Great work! Topic discussed in Chapter 2 Question 19 of 25 4.0 / 4.0 Points Suppose you pull off the broken tungsten filament in a burned-out incandescent light bulb. You take its mass and find it to be 0.100 grams. How many atoms of tungsten are in this filament? • A. 5.44 × 10-5 • B. 1.84 × 1025 • C. 3.28 × 1020 • D. 6.022 × 1023 Feedback:Good. See section 6.3 Question 20 of 25 0.0 / 4.0 Points Elemental chlorine gas is a lung irritant and highly toxic. What is the mass of 1 mole of this gas? • A. 70.9g • B. 6.022 × 1023 • C. 35.5g • D. 141.8g • E. none of the above Feedback:Topic discussed in Chapter 2.4. Part 3 of 3 - Part 03 16.0/ 20.0 Points Question 21 of 25 0.0 / 4.0 Points What symbol below is used to represent specific heat capacity? • A. ΔT • B. m • C. q • D. C • 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 22 of 25 4.0 / 4.0 Points energy is the energy of position. • A. electrical • B. kinetic • C. potential • D. chemical • 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 23 of 25 4.0 / 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: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 24 of 25 4.0 / 4.0 Points For a system at constant pressure, 12,400 calories of heat are released. This quantity of heat is equivalent to • A. 5.19 × 104 J • B. 1.24 × 104 J • C. 1.92 × 10-5 J • D. 2.96 × 103 J Feedback:Topic discussed in Chapter 9.1 Question 25 of 25 4.0 / 4.0 Points A piece of metal with a mass of 2.00 x 103 g needs 5.02 x 103 J of heat for its temperature to elevate from 20.0 °C to 40.0 °C. What is the specific heat capacity of this unknown metal in J/kg∙°C? (Note the kg as opposed to g in this unit) • A. 126 J/kg∙°C • B. 251 J/kg∙°C • C. 502 J/kg∙°C • D. 1.00 x 103 J/kg∙°C • E. 63.7 J/kg∙°C Feedback:Great! Energy concepts are discussed in Chapter 9.1. This is a specific heat capacity problem. No calculation needed.