P = 
After performing the calculation, the student's calculator appeared as shown below:
To the correct number of significant figures what is the value of P?
CHEM 1100 Name ___________________________________
Dr. Byrd
9/29/06 Exam 1
| Part I. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. (50 points) | ||
| 1) | What is the chemical symbol for iron? | 1) ______ |
| A) I | |
| B) Ir | |
| C) In | |
| D) Fe | |
| E) Au. |
| 2) | Calcium belongs to the ________ group of the periodic table. | 2) ______ |
| A) alkaline earth metal | |
| B) noble gas | |
| C) alkali metal | |
| D) halogen | |
| E) None of the above. |
| 3) | Which of the following elements is a solid at room temperature? | 3) ______ |
| A) Li | |
| B) S | |
| C) Mn | |
| D) Ba | |
| E) All of them are solids. |
| 4) | Which one of the following elements is not likely to be a good conductor of heat and electricity? | 4) ______ |
| A) mercury | |
| B) nitrogen | |
| C) lithium | |
| D) calcium | |
| E) All of them are good conducters. |
| 5) | The average distance between nitrogen and oxygen atoms is 115 pm in a compound called nitrogen oxide. What is this distance in centimeters? | 5) ______ |
| A) 1.15 × 10-9 cm | |
| B) 1.15 × 1016 cm | |
| C) 1.15 × 1012 cm | |
| D) 1.15 × 10-8 cm |
| 6) |
How many of the following numbers contain 4 significant figures? 0.105 6.000 0.0100 8.00 × 104 0.0001 | 6) ______ |
| A) one | |
| B) two | |
| C) three | |
| D) four | |
| E) five |
| 7) |
Each of the numbers in the following calculation represents a quantity measured by a student in the laboratory. P = After performing the calculation, the student's calculator appeared as shown below: To the correct number of significant figures what is the value of P?
| 7) ______ |
| A) 2 | |
| B) 2.430094 | |
| C) 2.430 | |
| D) 2.43 |
| 8) | The LD50 values for several chemicals are listed below. These chemicals were tested on laboratory mice. Which was the least toxic to the mice in small amounts? | 8) ______ |
| A) ethyl alcohol, 10.6 g/kg | |
| B) aspirin 1.5 g/kg | |
| C) sodium cyclamate, 17 g/kg | |
| D) chloroform, 3.2 g/kg | |
| E) None of the above. |
| 9) |
How many protons (p), neutrons (n), and electrons (e) are in one atom of  Ne?
| 9) ______ |
| A) 13 p, 10 n, 13 e | |
| B) 23 p, 10 n, 23 e | |
| C) 10 p, 13 n, 10 e | |
| D) 10 p, 23 n, 23 e | |
| E) None of the above. |
| 10) | A banana split is an example of | 10) ______ |
| A) a compound. | |
| B) an element. | |
| C) a homogeneous mixture. | |
| D) a heterogeneous mixture. | |
| E) None of the above. |
| 11) |
Which of the following represent isotopes? A:  [ ] B:  [ ] C:  [ ] D:  [ ]
| 11) ______ |
| A) A and B | |
| B) A and C | |
| C) C and D | |
| D) A and D | |
| E) None of the above. |
|
| ||
| 12) | Which of the above drawings represents a pure element? | 12) ______ |
| A) drawing (a) | |
| B) drawing (b) | |
| C) drawing (c) | |
| D) None of the above. | |
| E) All of the above. |
| 13) | How many electrons are in the ion, Mg2+? | 13) ______ |
| A) 14 | |
| B) 12 | |
| C) 10 | |
| D) 26 | |
| E) None of the above. |
| 14) | Which of the compounds, Li3P, PH3, C2H6, IBr3, are ionic compounds? | 14) ______ |
| A) Li3P and PH3 | |
| B) only C2H6 | |
| C) only Li3P | |
| D) PH3, C2H6, and IBr3 | |
| E) All of them |
| 15) | When dissolved in water, of HClO4, Ca(OH)2, KOH, HI, which are bases? | 15) ______ |
| A) only HI | |
| B) only KOH | |
| C) Ca(OH)2 and KOH | |
| D) HClO4 and HI | |
| E) All of them |
| 16) | The chemical formula for the sulfate ion is | 16) ______ |
| A) SO32-. | |
| B) SO42-. | |
| C) SO41- | |
| D) SO33-. | |
| E) None of the above |
| 17) | The compound, Fe2(SO4)3, is named | 17) ______ |
| A) iron(III) sulfate. | |
| B) iron(II) sulfate(III). | |
| C) iron(III) sulfite. | |
| D) diiron trisulfite. | |
| E) None of them are correct. |
| 18) |
Assume that the mixture of substances in drawing (1) undergoes a chemical reaction. Which of the drawings (2)-(4) represents a product mixture that is consistent with the law of mass conservation? | 18) ______ |
| A) drawing (2) | |
| B) drawing (3) | |
| C) drawing (4) |
| 19) |
What is the sum of the coefficients when the following equation is balanced using the lowest, whole numbered coefficients? ________ PH3(g) + ________ O2(g) → ________ P4O10(s) + ________ H2O(g) | 19) ______ |
| A) 12 | |
| B) 22 | |
| C) 10 | |
| D) 19 | |
| E) None of the above. |
| 20) | What is the molar mass of sodium sulfide? | 20) ______ |
| A) 87 g/mol | |
| B) 35 g/mol | |
| C) 110 g/mol | |
| D) 78 g/mol | |
| E) None of them. |
| 21) | How many moles are there in 149.2 g of potassium chloride? | 21) ______ |
| A) 0.750 mol | |
| B) 1.00 mol | |
| C) 0.500 mol | |
| D) 2.00 mol | |
| E) None of the above. |
| 22) |
Balance the chemical equation given below, and determine the number of moles of iodine that reacts with 2.00 moles of aluminum. ________ Al(s) + ________ I2(s) → ________ Al2I6(s) | 22) ______ |
| A) 6.00 mol | |
| B) 3.00 mol | |
| C) 1.00 mol | |
| D) 2.00 mol | |
| E) None of these are correct. |
| 23) |
If unshaded spheres represent nitrogen atoms and shaded spheres represent oxygen atoms, which box represents reactants and which represents products for the reaction 2 NO2(g) → 2 NO(g) + O2(g)? | 23) ______ |
| A) box (c) reactants and box (d) products | |
| B) box (a) reactants and box (d) products | |
| C) box (c) reactants and box (b) products | |
| D) box (a) reactants and box (b) products |
| 24) |
What is the balanced chemical equation for the reaction of element A (unshaded spheres) with element B (shaded spheres) as represented below? | 24) ______ |
| A) 2A + 3B → 2AB | |
| B) 2A + 3B2 → 2AB3 | |
| C) A + B2 → AB3 | |
| D) A + B → AB | |
| E) None of the above. |
| 25) |
The following diagram represents the reaction of A2 (unshaded spheres) with B (shaded spheres). What is the balanced chemical equation for this reaction, and what is the limiting reactant? | 25) ______ |
| A) 2A2 + B → A4B; A2 is the limiting reactant. | |
| B) 4A2 + 6B → 2A4B; B is the limiting reactant. | |
| C) 4A2 + 6B → 2A4B; A2 is the limiting reactant. | |
| D) 2A2 + B → A4B; B is the limiting reactant. | |
| E) None of the above are correct. |
| Part 2. Show all of your work, including units, to receive credit. | ||
| 26) |
(16) Gold has a density of 19.0 g/cm3. A sheet of gold foil, which is a square measuring 10.00 cm on each side, has a mass of 1.000 g. Calculate the thickness of the foil. See the reverse side of this page for problem #2. | |
| 27) |
(10) Complete the following table.
|
| 28) |
(24) Cisplatin [Pt(NH3)2Cl2] , a compound used in cancer treatment, is prepared by the reaction: K2PtCl4 + NH3 → KCl + Pt(NH3)2Cl2 a) (6) Balance the equation for the reaction. b) (6) If 55.8 g of K2PtCl4 (MM = 417 g/mol) and 4.32 g of NH3 (MM = 17 g/mol) are available to react, which is the limiting reactant? c) (6) How many moles of cisplatin can be formed from the reaction mixture in part b)? d) (6) How many grams of cisplatin (MM = 300 g/mol) can be formed? |
