Fall2022-Exam 1.pdf

Exam 1 CH 1010 Fall 2022 September 26, 2022 1. Consider the substance water and indicate the 4. What value should be reported, to the appropriate correct terminology....

Exam 1 CH 1010 Fall 2022 September 26, 2022 1. Consider the substance water and indicate the 4. What value should be reported, to the appropriate correct terminology. number of significant figures, for the length of the line shown below? Water is [an element/a compound/a mixture]. The smallest particles of the substance water (which are still considered to be water)are [atoms/molecules/ions]. 2. The temperature of an object is 381 °C. What is the temperature in Kelvin? A. 2 cm B. 1.6 cm Report the temperature to three significant figures C. 1.60 cm in units of K. D. 1.600 cm 3. A recycling plant needs to separate two types of 5. Determine the correct number of significant figures plastic: ABS, d = 1.15 g/mL and PET, d = 1.35 from the following calculation. g/mL. Would a solution of NaCl with a density of (3.51 + 27.492) 1.05 g/mL be able to separate them? 0.067342 A. No, the two plastics will not be separated A. 2 because both types would sink when added to B. 3 the solution of NaCl. C. 4 B. No, the two plastics will not be separated D. 5 because both types would float when added to E. 6 the solution of NaCl. C. Yes, the two plastics will be separated because ABS would sink and PET would float when 6. If a liquid evaporates at a rate of 42.6 kg per added to the solution of NaCl. minute, what is this evaporation rate in units of D. Yes, the two plastics will be separated because pounds per second? (1 pound = 453.6 g) ABS would float and PET would sink when added to the solution of NaCl. Page 1 of 5 7. Is the process depicted below endothermic or 11. What is the average atomic mass for an element exothermic? that has three naturally occurring isotopes with the Which of the following phase changes does this abundances shown? process represent at the particulate level: melting, 25 amu occurs with an abundance of 13.25% vaporization, condensation, or freezing? 26 amu occurs with an abundance of 28.41% messed up A the picture was how it looked. A 28 amu but this was Answer formatting tip: Report the atomic mass to ~ - two decimal places in units of amu. - 12. A sample of titanium tetrachloride, TiCl4, contains 1.86 × 1024 molecules. What is the mass, in grams, of the sample? This question requires four answers. 8. Classify the following as a cation, an anion, or a Answer formatting tip: Report a numeric answer neutral atom and identify the charge. with three significant figures in units of grams. Subatomic Cation/Anion/ This question requires two answers. Charge Particles Neutral? 13. A sample of krypton has the same number of moles as a sample of neon. Which sample has the 17 protons greater mass? 18 neutrons 18 electrons A sample of carbon has the same mass as a sample of silicon. Which sample contains more atoms? 56 protons 82 neutrons 54 electrons This question requires three answers. 14. Pick the type of electromagnetic radiation from each pair which corresponds to the given criteria. This question requires four answers 9. Classify each element as being one of the The type of electromagnetic radiation with the following options (some choices may be used more higher energy is [gamma radiation/radio waves]. than once or not at all): Inner Transition Metal The type of electromagnetic radiation with the Transition Metal shorter wavelength is [infrared/ultraviolet] Main Group Metal radiation. Main Group Non-Metal Metalloid or Semi-Metal The type of electromagnetic radiation with the lower frequency is [X-rays/visible light]. Iron is a ______________ Sulfur is a _____________ 15. The energy required to induce the photoelectric Silicon is a ______________ effect with ytterbium is 254 kJ/mol. What is the Sodium is a ______________ maximum wavelength, in nm, of light that is capable of this process? 10. Calculate the formula mass of ammonium sulfate, Answer formatting tip: Report a numeric answer (NH4)2SO4. with three significant figures; in units of nm. Answer formatting tip: Report a numerical value with three significant figures for the formula mass. Page 2 of 5 16. Which of the following electromagnetic radiations This question requires two answers would induce the photoelectric effect with rhodium 19. Consider different s orbitals of a particular metal (Φ = 7.98 × 10−19 J)? multielectron element. Would you expect a general increase, decrease, staying the same, or a trend Infrared light (ν = 2.50 × 1014 s−1) which depends on the element in question? Orange light (ν = 4.98 × 1014 s−1) Purple light (ν = 7.21 × 1014 s−1) What happens to the size of these orbitals as the principal quantum number (n) increases (1 → 2 → A. infrared light only 3 → 4)? B. purple light only C. both infrared light and orange light For orbitals in the 4th shell, what happens to the D. both orange light and purple light orbital energy as l increases (0 → 1 → 2 → 3)? E. all three lights, infrared, orange and purple F. none of these 20. How many unpaired electrons are found in the ground state electron configuration of the ion Ni3+? 17. Which of the following hydrogen atom transitions involves the absorption of a photon with the A. 2 lowest frequency? B. 1 C. 4 A. 1s → 2p D. 0 B. 3s → 4p E. 3 C. 2p → 1s F. 5 D. 4p → 3s This question requires two answers. 21. Complete the ground state electron configuration This question requires two answers. for chromium, Cr, by indicating the number of 18. Which of the following sets of quantum numbers n electrons in the s and d subshells. and l is consistent with the following atomic orbital? [Ar] 4sx 3dy The number of electrons in the 4s subshell, x, is___ The number of electrons in the 3d subshell, y, is___. This question requires three answers. 22. A particular element tends to form ions with a charge of (1−). What can be predicted about the following properties: A. n = 3, l = 2 B. n = 1¸ l = 2 The number of valence electrons in a neutral atom C. n = 3, l = 0 of this element is ____. D. n = 2, l = 3 E. n = 2, l = 1 The number of valence electrons in the −1 ion of this element is ____. In which group of the periodic table is this element most likely found? ____ Page 3 of 5 This question requires two answers. 26. Consider elements in the same row. Which has the 23. Which element in each set has the greater larger greatest affinity for an added electron (most atomic radius? negative electron affinity – EA)? Set I. K or Na A. The element with five electrons in the valence p subshell. Set II. S or Cl This question requires four answers. 24. Sort the following ions in order of increasing ionic B. The element with one electron in the valence p radius. subshell. As3−, Sr2+, Br−, Rb+ Smallest Ionic Radius C. The element with three electrons in the valence p subshell. Largest Ionic Radius D. The element with an empty valence p subshell. This question requires two answers. 25. Which element of each pair would you predict to E. The element with a full valence p subshell. have the smaller value for the third ionization energy, IE3? Pair I: Cl or P Pair II: Be or B Page 4 of 5  Exam 1 CH 1010 Fall 2022 USEFUL INFORMATION: Equations Constants NA = 6.0221 × 1023 1 u = 1 amu = 1.66054 × 10−24 g E = h⋅ν h = 6.626 × 10−34 J⋅s c = ν⋅λ c = 2.998 × 108 m/s φ = h⋅ν0  Answer Key Exam 1 CH 1010 Fall 2022 Question Answer Question Answer a compound 15 471 nm 1 molecules 16 F 2 654 K 17 B 3 A n=3 18 4 C l=2 5 C The orbitals get larger. 19 The energy of the 6 1.57 lb/s orbitals increases. exothermic 20 E 7 freezing 4s = 1 21 Species 1: anion 3d = 5 Charge 1: 1- 7 8 Species 2: cation 22 8 Charge 2: 2+ 17 Fe: Transition Metal I: K 23 S: Main Group Non-metal II: S 9 Si: Main Group Metalloid Sr(2+) Na: Main Group Metal Rb(+) 24 10 132 g/mol Br(-) 11 27.03 amu As(3-) 12 586 g for 1.86 × 10 molecules 24 I: P 25 krypton has the greater mass II: B 13 carbon has more atoms 26 A gamma radiation 14 ultraviolet radiation visible light