Recitation 1-Chapter 1 PDF

Chapter 1: Cumulative, Recitation #1 Student name: KSU ID: 1. What letter symbol is used to represent the factor 109? 2. How many mm are in 3.20 cm? mm 3. What is the volume of a 2.50 gram block of metal whose density is 6.72 grams per...

Chapter 1: Cumulative, Recitation #1 Student name: KSU ID: 1. What letter symbol is used to represent the factor 109? 2. How many mm are in 3.20 cm? mm 3. What is the volume of a 2.50 gram block of metal whose density is 6.72 grams per cubic centimeter? cm3 4. Select the longest distance. (1 in = 2.54 cm; 1 ft = 12 in = 0.33 yd = 0.303 m) a. 3.3 m b. 120 in c. 11 ft d. 3.9 yd e. 4.0 m 5. A cube of 1.2 inches on the side has a mass of 36 grams. What is the density in g/mL? g/mL 6. If the walls in a room are 955 square feet in area, and a gallon of paint covers 15 square yards, how many gallons of paint are needed for the room? (3 ft = 1 yd) gal 7. The average density of a human brain is 0.90 g cm-3. Which of the following is the correct process to convert g cm-3 to kg L-1? (Select the best option: 1,2 or 3) Roadmap: Equalities and conversion factors needed: 8. The density of the earth is about 4 g ml-1. Which of the following is the correct process to convert g ml-1 to kg m-3? (Select the best option: 1,2 or 3) Roadmap: Equalities and conversion factors needed: 9. a. Please calculate the volume in liters occupied by carbon monoxide (CO) in a room that measures 17.6 m long, 8.80 m wide, and 2.64 m high. Liters. b. Prolonged exposure to mercury (Hg) vapor can cause neurological disorder and respiratory problems. For safe air quality control, the concentration of mercury vapor must be under 0.050 mg/m3. Convert this number to g/L. g/L. c. The general test for type (II) diabetes is that the blood sugar (glucose) must be below 120 mg per deciliter (mg/dL). Please convert this number to µg/mL. µg/mL 10. A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.11 g/mL, 1.81 g/mL, 1.95 g/mL, 1.75 g/mL. If the actual value for the density of the sugar solution is 1.75 g/mL, which statement below best describes her results? a. Her results are precise. b. Her results are accurate c. Her results are both precise and accurate d. Het results are nor precise, nor accurate. 11. Density is defined as the ratio of the mass of an object to its volume. Looking at the small- particle views of water as a solid, liquid, and gas, which phase has the highest density? a. Solid b. Liquid c. Gas d. All have the same density. Discuss your answer with your partner/group members. What evidence supports your answer? 12. If you had equal masses of each of the following substances, which would occupy the greatest volume? a. ice (d = 0.917 g/mL) b. water (d = 0.997 g/mL) c. beeswax (d = 0.960 g/mL) d. cocoa butter (d = 0.910 g/mL) e. Aluminum (d = 2.70 g/mL) 13. A graduated cylinder is filled with water to the 25.0 mL mark. After 27.5 g of titanium dioxide (TiO2) is added, the volume is 31.5 mL. Calculate the density of the TiO2 to the correct number of significant figures. a. 0.873 g/cm3 b. 0.87 g/cm3 c. 4.23 g/cm3 d. 3.1 g/cm3 2 14. Which pure substances are compounds? a. Brass b. Glycine c. Helium d. Mercury e. Saline f. Ammonia g. Hydrogen peroxide h. Propane i. Platinum 15. Identify the INCORRECT statement. a. Helium in a balloon: an element b. Paint: a mixture c. Tap water: a compound d. Mercury in a barometer; an element 16. Which answer includes all the following that are chemical changes and not physical changes? I. freezing of water II. rusting of iron III. dropping a piece of iron into hydrochloric acid (H2 is produced) IV. burning a piece of wood V. emission of light by a kerosene oil lamp a. III and IV b. II and V c. I, II, III, IV, and V d. II, III, and V e. II, III, IV, and V 17. Which of the following is an intensive property of chlorine? a. The pressure exerted on a container of chlorine gas at a given temperature b. Chlorine boils at -34°C. c. Chlorine gas, when inhaled in large amounts, is toxic to humans. d. The amount of energy released when chlorine reacts with oxygen e. A typical swimming pool can be sanitized with 10 mL of liquid chlorine 18. Which of the following is an extensive property of hydrogen? a. Hydrogen gas is odorless and colorless. b. A hydrogen gas molecule is composed of two hydrogen atoms. c. Hydrogen gas is flammable. d. The amount of energy released when hydrogen reacts with oxygen e. A hydrogen gas molecule has a density of 0.09 g/L 3