Practice Exam 1 Answer Key

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Tarrant County College South East *

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1405

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Chemistry

Date

Feb 20, 2024

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pdf

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Measurement, Atoms, Elements, & Compounds These questions taken from the web resources made available from San Diego Miramar College, a member of the San Diego Community College District (SDCCD). Modifications have been made for clarity, to correct typos, and better align questions to TCC curriculum. We thank the faculty of San Diego Miramar College for making this resource available to us. Other sources include the test bank associated with the Chemistry 1406 Timberlake text. I. The Scientific Method (Optional: Not all professors cover this section!) Select the best answer to each of the following questions: 1. This is performed to verify a hypothesis or theory. A) Hypothesis B) Law C) Experiment D) Theory E) None 2. "Conservation of Energy" is an example of a(n): A) Hypothesis B) Law C) Experiments D) Theory E) None 3. How many experiments are required to prove a theory incorrect? A) All it takes is one provided the experiment is validly performed and the results are correctly interpreted. B) At least 5 out of 10 (50%) C) Three quarter (3/4) ratification before a theory goes on to the Science President for approval. D) If a theory is proven invalid by an experiment, the theory can still be correct if the experimental conditions are changed. E) A theory cannot be proven incorrect once it has become a theory. 4. Which of the following is an example of an observation? A) A gas expands when heated because the gas particles are moving faster. B) A balloon shrinks when taken outside on a very cold day. C) A balloon is placed in an ice bath and then placed in a tub of hot water. D) A balloon will be poked with a sharp object at the end of class. .E) None of the above. 5. The first step in the scientific method is ______. A) Using technology B) making observations C) forming a hypothesis D) doing experiments E) Proposing a theory

6. Which of the following is an example of a hypothesis? A) Water boils at 100°C. B) Seeds are planted in moist soil. C) Plants need sunlight to grow. D) The seeds sprouted 10 days after they were planted. E) None of the above. 7. When a match burns, heat is evolved" is an example of A) An experiment. B) A theory. C) An observation D) A law of nature. E) None of the above. 8. Which of the following is not a step in the scientific method? A) Experiment. B) Theory C) Natural phenomenon D) Observation E) all are steps in the scientific method 9. "All matter is made of tiny, indestructible particles called atoms" is an example of A) An experiment. B) A theory C) An observation D) Law of nature E) A hypothesis 10. You noticed that there is more traffic between 8 and 9 in the morning. This would be a(n) A) Observation. B) Hypothesis C) Experiment D) Theory E) All of the above

II. Matter and Measurement Select the best answer to each of the following questions: 11. How many significant figures should there be in the answer to the following problem? (?. ? − ??. ?) × (?. 𝟕𝟗 × ?? ? ) ??𝟗 A) 1 B) 2 C) 3 D) 4 E) none of the above 12. Which one of the following measurements contains the fewest number of significant figures? A) 0.01003 mm B) 100360 mL C) 1300 kg D) 1.00 • 10 -4 g E) all have the same number of significant figures 13. The numerator and the denominator of a conversion factor are related by: A) both numbers are equivalent to each other. B) both must have the same units C) when divided by each other it yields zero D) both must have metric units. E) none of the above 14. For a pharmacist dispensing pills, it is often easier to weigh the medication to be dispensed rather than to count the individual pill. If a single pill weighs 0.65 g and the pharmacist weigh out 15.6 g of pills, how many pills have been dispensed? A) 10 pills B) 16 pills C) 24 pills D) 50 pills E) none of the above 15. A nurse must administer the appropriate dosage of atropine sulfate to a 165-lb male patient. The dosage on the label of a bottle of atropine sulfate tablets reads 20 mg for every kilogram of body weight. If each tablet contains 0.5 grams of atropine sulfate, how many tablets are needed to give the correct dose to the patient? A) half tablet B) 1 tablet C) two tablets D) three tablets E) none of the above

16. In a Gap in France, you decide to try on a pair of French jeans. What does a waist measurement of 52 cm correspond to in inches? A) 43 in B) 32 in C) 20. in D) 130 in E) none of the above 17. The prescribed injection of a drug is 0.17 oz. If the syringe measures volume in cubic centimeters, to what mark would you draw the drug? (29.6 mL = 1 oz) A) 0.17 cc B) 5.7 × 10 −3 cc C) 5.0 cc D) 29 cc E) not enough information 18. The daily dosage of ampicillin for treating an ear infection is 100. mg per kilogram of body weight. What is the dosage for a 22-lb. baby with an ear infection? A) 1.0 mg B) 1.0 g C) 5.0 g D) 500 mg E) none of the above 19. Which is equal to a nanometer? A) 100 Å B) 1 • 10 −9 m C) 1 • 10 9 m D) 1 • 10 9 cm E) none of the above 20. In which of the following is the metric unit paired with its correct abbreviation? A) microgram and mg B) milliliter and mL C) centimeter and km D) gram and gm E) none of the above 21. Which one of the following measurements contains the most number of significant figures? A) 0.01003 g B) 100360 g C) 100000. g D) 10.0 • 10 −3 g E) 0.00002041 g

22. Which is not an SI Unit? A) gram B) mole C) second D) kilogram E) All of the above are SI units. 23. Which is not an English unit? A) liter B) pound C) yard D) ton E) They are all written in English. 24. Which is a derived unit? A) seconds B) mole C) calorie D) kilogram E) none of the above is a derived unit 25. "m" is the symbol for which of the following units: A) mile B) mole C) meter D) mass E) all of the above 26. A student calculates a problem on her calculator and the number 1570.2691 is shown on the display. If only four significant figures should be in the answer, what should she write as the final answer? A) 1570 B) 1570.3 C) 157 D) 1 .570 • 10 3 E) none of the above 27. Which of the following represents the highest temperature? A) 300 K B) Boiling point of water C) 250°F D) 75°C E) all of the above are equal

28. What is the number of significant figures that should be reported for the mass of a sample which is obtained by taking the difference between the mass of a sample plus beaker (125.260 g) and the mass of the beaker (124.5805 g) ? A) 6 B) 5 C) 4 D) 3 E) This calculation cannot be performed with only the information given. 29. Which of the following is the largest mass? A) 4.1 • 10 −6 kg B) 22 g C) 8.2 • 10 9 ng D) 3 • 10 3 mg E) 352 cg 30. In which of the following is the metric unit paired with its correct abbreviation? A) microgram and mg B) milliliter and mL C) cubic centimeter and ccm D) gram and gm E) all of the above are correctly paired 31. How many centimeters are there in 57.0 in? A) 22 cm B) 0.0445 cm C) 145 cm D) 22.4 cm E) 140 cm 32. The measurement 0.0000043 m, expressed correctly using scientific notation, is A) 4.3 × 10 −7 m B) 4 .3 × 10 −6 m C) 4.3 × 10 6 m D) 0.43 × 10 −5 m E) 43 × 10 −5 m 33. Which of the following numbers is the smallest? A) 4.0 × 10 −7 B) 8 .7 × 10 −8 C) 1.3 × 10 −2 D) 1.14 × 10 −7 E) 7.8 × 10 9

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