Problem Set 1

# Problem Set 1 - a 72°F to °C b 25°C to K c 3.58 mg to g...

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Problem Set 1 Chemistry 1130 Ch. R, pp. 1-23 Ch. 1, pp. 30-41 Chem 1130 - 1 - Problem Set 1 Introduction to the Scientific Method and Dimensional Analysis 1. Describe the application of a Law, a Hypothesis, and a Theory, in the context of the 'Scientific Method'. 2. Using the definitions above where appropriate, describe the process through which Lavoisier was likely to have arrived at his conclusions regarding the conservation of mass in chemical reactions. 3. Describe the relationship between elements, compounds and mixtures. Identify whether each of the following is an element, compound, or mixture, and identify all the phases present at room temp and 1 atmosphere pressure. Ar Br 2 NH 3 NaCl(aq) Rock Brass 4. Try to name three substances from your everyday experience that have not been altered some way chemically by human means. 5. Determine the number of significant figures in each of the following, and convert each to scientific notation. 5,000 5125 0.003052 93.450 453 x 0.2031 = ______ 12.54 + 9.321 + 1.10 = ______ (9.04 - 8.23 + 21.954 + 81.0) / 3.1416 = ______ 4.184 x 100.62 x (25.27 - 24.16) = ______ 6. Complete the following conversions:
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Unformatted text preview: a) 72°F to °C b) 25°C to K c) 3.58 mg to g d) 0.345 L to ml e) 125 cm 3 to in 3 f) 46.4 m 3 to liters 7. Describe what is meant by the terms “exact number” and “derived unit”. Provide an example of each. 8. If a runner finishes a 5.00 km cross-country race in 22.0 minutes, a) what is the runner’s average pace, in min/mi? b) what is the runner’s average speed in m/s and in mi/hr? 9. The density of mercury is 13.53 g/mL. What is the volume of 6.86 g of mercury? 10. A sample of metal weighing 8.46 g is known to be either Ni, W, Pd, or Os. Metal Density (g/cm 3 ) The sample is placed into a graduated cylinder containing 25.00 ml of water, Ni 8.90 after which the total volume of water plus metal is observed to be 25.44 ml. W 19.35 Given the density data, identify the metal. Pd 12.02 Os 22.48 11. If an automobile can travel 22 mi on one gallon of gasoline when traveling at a velocity of 65 mi/hr, how many grams of gas are consumed per hour ? Assume the density of gasoline is 0.80 g/ml. Chap. R & 1, Homework Problems: R.24, R.26, R.30, R.32, R. 46, R.54, R.72; 1.32, 1.48, 1.54...
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