CHEM133 Week 7 Midterm Exam (March)

1. Question: Suppose a house has a floor area of 2,250 square feet. What is this area in units of square centimeters? 2. Question: A piece of antimony with a mass of 17.41 g is submerged in 46.3 cm3 of water in a graduated cylinder. The water level increases to 48.9 cm3. The correct value for the density of antimony from these data is: 3. Question: Liquid nitrogen boils at –195.8°C. Express the boiling point of liquid nitrogen in kelvin. 4. Question: What is the volume, in cubic centimeters, of a brick that is 4.0 in × 2.7 in × 8.0 in? 5. Question: Choose the response that includes all the items listed below that are pure substances. i. orange juice ii. steam iii. ocean water iv. oxygen v. vegetable soup 6. Question: A sample of chemical X is found to contain 5.0 grams of oxygen, 10.0 grams of carbon, and 20.0 grams of nitrogen. The law of definite proportion would predict that a 67 gram sample of chemical X should contain how many grams of carbon? 7. Question: What is the chemical formula for strontium hydroxide? 8. Question: Which element can form more than one kind of monatomic cation? 9. Question: What are the names of the ions Ba2+, Sn2+, and Se2-? 10. Question: How many protons (p) and neutrons (n) are in an atom of calcium-46? 11. Question: How many silver atoms are contained in 3.75 moles of silver? 12. Question: What is the molecular mass of Br2? 13. Question: What mass of C6H12O6 (glucose) is needed to prepare 450. mL of a 0.650 M solution of glucose in water? 14. Question: What is the mass of 4.50 x 1022 Cu atoms? 15. Question: What mass of K2CO3 is needed to prepare 200. mL of a solution having a potassium ion concentration of 0.150 M? 16. Question: Write a net ionic equation for the neutralization reaction of HCN(aq) with NaOH(aq). 17. Question: If the percent yield for the following reaction is 65.0%, how many grams of KClO3 are needed to produce 32.0 g of O2? 18. If the percent yield for the following reaction is 75.0%, and 45.0 g of NO2 are consumed in the reaction, how many grams of nitric acid, HNO3(aq) are produced? 19. Which of the following will occur when solutions of CuSO4(aq) and BaCl2(aq) are mixed? 20. A 57.17 g sample of Ba(OH)2 is dissolved in enough water to make 1.800 L of solution. How many mL of this solution must be diluted with water in order to make 1.000 L of 0.100 M Ba(OH)2? 21. Question: What is the frequency of a helium-neon laser light with a wavelength of 632.8 nm? 22. Question: What is the energy of a photon of violet light that has a wavelength of 425 nm? 23. Question: A common way of initiating certain chemical reactions with light involves the generation of free halogen atoms in solution. 24. Question: For an electron in a given atom, the larger n, the 25. Question: What is the binding energy of an electron in a metal whose threshold frequency for photoelectrons is 2.50 × 1014 Hz? 26. Question: The density of lead is 11.4 g/cm3. Convert the density to lb/ft3. 28. Question: Calculate the average atomic mass of iron: 29. Question: Lithium, is used in dry cells and storage batteries and in high temperature lubricants, it has two naturally occurring isotopes, 6Li and 7Li. Calculate the atomic mass of lithium. 34. Question: List the values of n, l, ml, and ms for electrons in the 4p subshell. 35. Question: For Bromine atom