Chemistry Team Test Answers 9th Annual FGCU Invitational Mathematics Competition December 8, 2011

Transcription

1 Chemistry Team Test Answers 9th Annual FGCU Invitational Mathematics Competition December 8, The symbols for the chemical elements lead, silver and antimony respectively are represented by: A) Pd, Ag, At B) Pb, Au, Sn C) Pb, Ag, Sb D) Pu, Hg, Am E) Lu, S, Ac 2. The Name for H, Ca, O, and Fe is: A) Hydrogen, Chlorine, Osmium, and Iron B) Helium, Carbon, Oxygen and Phosphorus C) Helium, Cadmium, Osmium, and Francium D) Hydrogen, Calcium, Oxygen, and Iron E) Argon, Calcium, Oxygen, and Phosphorus 3. Select the correct names for the following compounds: PCl 3, CO 2, and SF 4 A) Phosphorus Trichloride, Carbon Dioxide, and Sulfur Tetrafluoride B) Phosphorus Chloride, Carbon Oxide, and Sulfur Fluoride C) Phosphorus Chlorine, Carbon Oxide, and Fluoride D) Chloride Phophoric, Carbon Dioxide, Sulfur Fluorinate E) Chlorine Phosphoric, Carbon Oxide, and Sulfur Fluorinate 4. An explanation for the general causes of certain phenomena, with considerable evidence or facts of support is known as: A) Hypothesis B) Theory C) Scientific method D) Scientific analyses E) Conclusions 5. Which atom has the smallest number of protons? A) nitrogen-14 B) carbon-14 C) neon-20

2 D) fluorine-19 E) oxygen An atom of the most common isotope of platinum, 195 Pt, has protons, neutrons, and electrons. A) 195, 78, 117 B) 78, 117, 117 C) 78, 117, 78 D) 117, 78, 38 E) 78, 195, Which isotope has 44 neutrons? A) 103 Rh B) 34 Cl C) 80 Kr D) 80 Br E) 90 Ru 8. The average atomic weight of copper, which has two naturally occurring isotopes, is One of the isotopes has an atomic weight of 64.8 amu and constitutes 30.9% of the copper isotopes. The other isotope has an abundance of 69.1%. The atomic weight (amu) of the second isotope is amu. A) 28.1 B) 63.8 C) 64.1 D) 63.2 E) A small amount of calcium chloride dissolved in water is an example of a. A) homogeneous mixture B) compound C) pure substance D) solid E) heterogeneous mixture 10. Air is an example of a/an. A) element B) pure substance C) compound D) mixture E) None of the above 11. Which of the following is an example of a chemical reaction? A) tarnishing of silver B) evaporation of dry ice C) crushing of stone D) melting of gold E) dissolving sugar in water

3 12. The wavelength of light that is emitted from a light having a frequency of Hz is. A) 283 nm B) 847 nm C) 118 nm D) 354 nm E) 782 nm 13. An electron cannot have the quantum numbers n =, l =, m l = A) 2, 2, 0 B) 2, 1, -1 C) 3, 1, 1 D) 1, 0, 0 E) 3, 2, The ground state configuration of phosphorous is. A) [Ne]3s23p1 B) [Ne]3s23p2 C) [Ne]3s23p3 D) [Ne]3s23p4 E) [Ne]3s23p5 15. What color of visible light has the lowest energy? A) violet B) blue C) red D) green E) yellow 16. Of the following, which gives the correct order for atomic radius for Mg, Na, P, Si and Ar? A) Mg > Na > P > Si > Ar B) Ar > Si > P > Na > Mg C) Si > P > Ar > Na > Mg D) Na > Mg > Si > P > Ar

4 E) Ar > P > Si > Mg > Na 17. Which equation correctly corresponds to the first ionization energy of strontium? A) Sr (g) Sr + (g) + e - B) Sr (g) Sr - (g) + e - C) Sr (g) + e - Sr - (g) D) Sr - (g) Sr (g) + e - E) Sr + (g) + e - Sr (g) 18. Using the data in the table, determine the rate constant with correct units. [A] M [B] M Rate (M/s) x x x 10-2 A) 0.38 M -1 s -1 B) s -1 C) 0.28 s -1 D) 0.17 M -2 s -1 E) There is insufficient information given to solve the problem 19. How many moles of gas are there in a 25.0 L container at 15.0 C and mm Hg? A) 8130 B) 423 C) D) 1.80 E) When rounded to the correct number of significant figures, what is the answer to the following calculation? A) 0.7 B) 0.67 C) =

5 D) E) When determining the number of significant figures in a calculation or measurement, which of the following statements is true about zeros? Zeros are significant. A) always B) never C) at the beginning of a number D) at the end of a number without decimals E) when between nonzero digits 22. Give the appropriate length measurement marked by the arrow. A) 3 cm B) 3.0 cm C) 3.1 cm D) 3.00 cm E) 3.10 cm 23. The volume of a block of wood is cm 3 and has a density of g/cm 3. What is the volume in L? A) B) 1265 C) D) 204,200 E) The average age of students living on campus at FGCU is 18.8 years. How old is the average student in minutes? (1 year= 365 days) A) 9.88 x 10 6 B) 6860 C) 1.01 x 10-7 D) 74.2 E) 3.58 x The gravitational acceleration constant is 9.81 m/s 2. Convert the constant to units of ft/min 2? A) 16,700,000 B) 1,930 C) 116,000 D) 278,000

6 E) 8.31 x A 1.83 ml sample of isopropyl alcohol has a density of 0.85 g/ml. What is the mass of the sample in milligrams? A) 0.46 B) 460 C) 2.2 D) 1600 E) 1.6 Use the following graph for questions 27 & 28: 27. What quantity does the slope of the graph above represent? A) Mass x Volume B) Mass/Volume C) Volume/Mass D) Mass E) Volume 28. Based on the graph above, what would the sample volume (in ml) be if the sample mass was 53.8 g? A) 4.97 B) 4970 C) 583

7 D) 5.83 E) What are the coefficients after the following reaction has been balanced? A) 2, 1, 1, 3 B) 2, 1, 2, 3 C) 4, 5, 4, 6 D) 4, 3, 4, 3 E) 2, 5, 2, 6 NH 3 (g) + O 2 (g) NO(g) + H 2 O(g) 30. How many grams of Na 2 CO 3 can be produced from g NaOH? A) 106 g B) 53.0 g C) g D) g E) g 2 NaOH(s) + CO 2 (g) Na 2 CO 3 (s) + H 2 O(l)