University:
Rutgers University Newark
Course:
CHEM 335 | Organic Chemistry
Academic year:

2024
Views:

237

Pages:

20
Author:

Mahitab S.

Exam CH101 Spring 2011 Version A Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. A chemical change: A) occurs when salt is dissolved in water. B) occurs when methane gas is burned. C) occurs when iodine solid is melted. D) occurs when water is vaporized. E) occurs when powdered lemonade is stirred into water. Which of the following properties is intensive (does not depend on amount)? A) Molecular weight B) Mass C) Number of moles D) Volume E) None of above How many significant figures are in the measurement, 0.5890g? A) 5 B) 6 C) 7 D) 3 E) 4 A sample of mercury has a volume 0.950 L. A sample of iron has the same mass. What is the volume of the iron sample? Density of mercury is 13.546 g/mL and the density of iron is 7.874 g/mL. A) 1.81 L B) 0.612 L C) 1.63 L D) 0.552 L E) 1.29 L Determine the density of an object that has a mass of 149.8 g and displaces 12.1 mL of water when placed in a graduated cylinder. A) 0.0518 g/cm³ B) 11.4 g/cm³ C) 19.3 g/cm³ D) 2.70 g/cm³ E) 0.370 g/cm³ Density of silicon is 2.3290 g/cm³. What is the volume of the sample, which weighs 12.54392 g? A) 5.38597 cm³ B) 0.005386 C) 5.3860 mL D) 0.1857 cm³ E) -0.18567 cm³ 35 mL of syrup (density 1.33 g/cm³) was poured into a cup, which weighs 202.4 g. What is the total weight of the cup with syrup? A) 250 g B) 249 g C) 248.95 g D) 156 g E) 155.9 g 8. Isotopes of the same element differ in the number of: A) electrons B) neutrons C) alpha particles D) protons E) charge 9. What species is represented by the following information? p=48 n=64 e=46 A) Pu B) Ag⁺ C) Cd²⁺ D) Pd E) Cd 10. Predict the charge that a sulfur ion would have. A) 2- B) 2+ C) 1- D) 1+ E) 6+ 11. Beryllium has only one stable isotope. Determine the number of protons, neutrons and electrons in an ion, formed by beryllium. A) p=4 n=4 e=9 B) p=4 n=9 e=4 C) p=4 n=5 e=2 D) p=4 n=5 e=5 E) p=5 n=4 e=3 12. Which of the following elements is neither a metal, nor a nonmetal? A) I B) Rh C) Ge D) Se E) Ne 13. Which of the following elements can form divalent cations? A) I B) Rb C) S D) Al E) Mg 14. Silver has an atomic mass of 107.868 amu. The content of the ¹⁰⁷Ag isotope (mass number is 106.905 amu) is 48.16%. What is the mass number of the other isotope of silver? A) 106.911 amu B) 106.905 amu C) 106.908 amu D) 106.903 amu E) 109.905 amu 15. Which of the following contains the FEWEST atoms? (You shouldn't need to do a calculation here.) A) 4.0 g of copper B) 4.0 g of iron C) 4.0 g of lead D) 4.0 g of tin E) 4.0 g of silver 16. What mass does 0.584 moles of sodium chloride have? A) 34.13 g B) 13.43 g C) 20.7 g D) 43.47 g E) 71.50 g 17. The correct molecular formula for diphosphorus trioxide is: A) P₂O B) P₂O₃ C) P₂O₄ D) P₂O₅ E) H₂PO₃ Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Which of the following equations is incorrect: A) ΔH = ΔE + PAV B) q = ΔE + W C) -ΔE = ΔH D) W = P(V₁ - V₂) E) q = CpmΔT Which of the following substances would show the smallest temperature change after absorbing 200.0 J of heat? A) 10.0 g Fe, CFe = 0.449 J/g°C B) 10.0 g Ag, CAg = 0.235 J/g°C C) 10.0 g Au, CAu = 0.128 J/g°C D) 10.0 g H₂O, CH₂O = 4.18 J/g°C E) 10.0 g ethanol, Cethanol = 2.42 J/g°C A temperature of 20g sample of silver was 15°C. How much heat is needed to warm this sample up to 130°C? CAg = 0.235 J/g°C A) 611 J B) 541 J C) 1.55 kJ D) 682 J E) 1.84 kJ A 30 g piece of metal having 170°C was dropped into a calorimeter containing 150 g of water at 18°C. What is a heat capacity of metal, if the final temperature of the calorimeter was 25°C? (CH₂O = 4.18 J/g°C) A) 1.01 J/g°C B) 0.86 J/g°C C) 2.56 J/g°C D) 0.38 J/g°C E) 0.56 J/g°C Which of the following is correct for an exothermic process? A) Heat is absorbed by the system B) Heat is produced by the surrounding C) ΔHsystem > 0 D) Temperature of the surrounding decreases E) All four statements (A-D) are incorrect