Topics: Atom, Chemical reaction, Chemical bond Pages: 6 (3824 words) Published: October 29, 2014
Final Exam Review Chapter 2 Study Questions 1. Define the following a) elementb) compoundc) pure substance 2. Classify each of the following as a pure substance or a mixture. For each pure substance, indicate whether it is an element or a compound. Which of the mixtures are solutions a) airb) titaniumc) oakd) baking soda e) oxygenf) 7-Upg) wineh) carbon monoxide 3. Label each of the following drawings as element, compound, or mixture (Assume each type of circle represents a different type of atom.) a)b)c)d) ____________ ____________ ____________ ____________ Which of the boxes above contain molecules 4. List four physical states of matter. For each physical state, indicate whether the particles are in motion and whether they are close or far apart. 5. List one chemical and one physical property of the element chlorine. (You may use your textbook.) 6. Describe three observations that frequently accompany chemical reactions and explain why they might indicate that a chemical reaction is occuring. 7. Classify each of the following processes as physical or chemical changes. a) combustion of natural gas b) evaporation of alcohol c) condensation of water vapor d) photosynthesis e) splitting of carbon dioxide into carbon and oxygen f) formation of sodium chloride (NaCl) from it elements g) distillation of a sodium chloride solution to collect pure water 8. Record one a) qualitative and one b) quantitative observation about this page. State a theory about this page. 9. Give the name of the following types of containers a)b)c)d) Summary of Chapter 2 Matter and Energy matter physical states solid, liquid, gas physical chemical properties physical chemical changes elements compounds atoms molecules pure substances homogenous and heterogenous mixtures solutions separation of mixtures distillation, filtration, chromatography Chemistry Chapter 5 Study Questions 1. Express the following numbers or answers in scientific notation a) 650 (2 sig fig)b) 0.0005 (1 sig fig)c) 207,000 (3 sig fig) d) (5.0 x 103) x (2.0 x 102)e) (3.0 x 102) (6.0 x 10(3) 2. For each of the following, indicate the metric unit and a device used to measure it. a) volume b) massc) length 3. Indicate the number of significant figures in the following numbers a) 2,348b) 7.0001 c) 0.0023d) 24,500e) 0.1060 4. Perform the following operations and express the answers in significant figures a) 1.24 x 8.2 b) 6.78 - 3.3 c) 9.999 0.22 d) (5.67 x 103) x (2.1 x 10(2) 5. Bozo determined the density of a sample of aluminum. For his sample, he found the volume was 0.350 cm3 and the mass was 0.822 g. a) Calculate the density of aluminum from Bozos data. b) The actual density of aluminum is 2.70 g/cm3. Calculate Bozos percent accuracy error. NOTE Use conversion factors to answer the problems below. Show all work. Answers must be in significant figures and include units. Use the table on the inside back cover of the textbook as needed. (Or you may use the Table handed out in class.) 6. Calculate the mass in milligrams of a person with a mass of 50.0 kg. 7. Find the mass in pounds (lbs) of a 275-gram sample of sugar. 8. Find the number of cm in 0.286 miles. 9. Find the volume in microliters of 11.8 kg of iron. The density of iron is 7.87 g/cm3. 10. Tungsten is a very dense metal, with a density of 19.3 g/cm3. Convert the density of tungsten to pounds/quart. 11. The volume of a sample is recorded from three different containers as indicated below. The true value for the volume is exactly 61.2 mL. MeasurementContainer AContainer BContainer C163.40 mL61 mL59 mL263.48 mL60 mL59 mL363.42 mL62 mL59 mLa) Which of the three containers is the most precise b) Which container is the most accurate c) Which container(s) show a systematic error 12. (OPTIONAL) Assuming each ant is 5.0 mm long, how many...
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