ENGR 1120 – PROGRAMMING FOR ENGINEERS (MATLAB) Homework Program #2 Objectives: Demonstrate knowledge of data files, vector variables, intrinsic functions, subscript manipulation, for loops, and plotting in MATLAB. You have been given a set of ASCII data files that contain directions for laying out patterns in a field. The data files contain in the first column a distance to travel and in the second column a direction heading. Unfortunately, the person who created the data did not have a good understanding of orienteering and the direction headings are given as referenced to a clock face. The pattern begins at the origin of a Cartesian coordinate system with the person facing 12 o’clock, see the figure below. The figure shows an example of the first step in the pattern being a distance of 1.5 feet in the direction of 7 o’clock. All direction headings are given in terms of this clock orientation. The distance values given are in feet. There are 5 data files provided online for testing of the program. Write a script file that will allow the user to input from the keyboard the filename of the file that they wish to analyze. Load only that ONE data file and plot the resulting pattern. Once each point forming the pattern has been located, find and designate on the plot which of the resulting nodes was the farthest away from the origin. Also find and designate the center of the pattern as defined to occur at the coordinate location corresponding to (average x, average y). When plotting the resulting pattern on the Cartesian coordinate system, set the axes limits to appropriate values. HINT: Correlate the direction headings provided in the data files to a Cartesian coordinate system by using the following vector in your script file. This requires subscript manipulation. angle = [60; 30; 0; 330; 300; 270; 240; 210; 180; 150; 120; 90] -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 1 2 3 4 5 6 7 8 9 10 11 12 you are here

ENGR 1120 – PROGRAMMING FOR ENGINEERS (MATLAB) Homework Program #2 Objectives: Demonstrate knowledge of data files, vector variables, intrinsic functions, subscript manipulation, for loops, and plotting in MATLAB. You have been given a set of ASCII data files that contain directions for laying out patterns in a field. The data files contain in the first column a distance to travel and in the second column a direction heading. Unfortunately, the person who created the data did not have a good understanding of orienteering and the direction headings are given as referenced to a clock face. The pattern begins at the origin of a Cartesian coordinate system with the person facing 12 o’clock, see the figure below. The figure shows an example of the first step in the pattern being a distance of 1.5 feet in the direction of 7 o’clock. All direction headings are given in terms of this clock orientation. The distance values given are in feet. There are 5 data files provided online for testing of the program. Write a script file that will allow the user to input from the keyboard the filename of the file that they wish to analyze. Load only that ONE data file and plot the resulting pattern. Once each point forming the pattern has been located, find and designate on the plot which of the resulting nodes was the farthest away from the origin. Also find and designate the center of the pattern as defined to occur at the coordinate location corresponding to (average x, average y). When plotting the resulting pattern on the Cartesian coordinate system, set the axes limits to appropriate values. HINT: Correlate the direction headings provided in the data files to a Cartesian coordinate system by using the following vector in your script file. This requires subscript manipulation. angle = [60; 30; 0; 330; 300; 270; 240; 210; 180; 150; 120; 90] -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 1 2 3 4 5 6 7 8 9 10 11 12 you are here

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Que 1: in women who suffer from migraine …………………. are classified menstrual migraines, which tend to be more severe and longer lasting . a) 5% – 10% b) 45% – 55% c) 20% – 50% d) 65%-75% Que 2: why are the women on average, slightly shorter than men a) They have fat then man which contributes to stature b) Their long bones are sealed and stop growing earlier than men c) Their brains are somewhat smaller than man’s brain d) Their brains are somewhat larger than man, brain que 3: menopause frequently occurs between ………………..age of year a) 25-30 b) 45-55 c) 35-40 d) 65-75 que 4: this hormone causes enlargement of the larynx and an increase in the length and thickness of the vocal cords. A) estrogen 2) cholesterol 3) progesterone 4) testosterone Que 5: the reproductive cycle includes which of the following interconnected sets of events a) Ovarian cycle b) Urinary cycle c) Placental cycle d) Female prostate cycle Que 6: high level of circulating progesterone have been associated with : a) Excessive milk production b) Ovarian cancer c) Inability to breast feed a new born child d) Pregnancy Que 7: although variations exist, ovulation typically occurs on the …………day before mensuaration a) 1st b) 14th c) 7th d) 28th Que 8: LH stimulates interstitial cells a) To decrease GnRH b) To produce FSH c) To produce testosterones d) To produce sperm Que 9:what region of the uterus is shed during menstration? a) Stratum basalis of the myometrium b) Stratum basalis of the endometrium c) Stratum functionalis of the endometrium d) Perimetrium Que 10: the phenomenon is which women living in close proximity tend to menstruate at approximately the time is called. a) Precocious puberty b) Menstrual synchrony’ c) Delayed puberty d) Ovarian synchrony Que 11.studies have shown that healthy menstruating women a) Should not participate in sports b) Often feel ill or weak when exercising c) Are able to safety engage in athletic activities d) Can contaminate others and should not engage in contacts sports. Que 12: which term below describes a chemical that resembles steroid hormones and posses threat to maintain homeostasis. a) Androgens b) Prostaglandins c) Endocrine disruptors d) All of the above Que 13: one of the primary function of ……….is preparing and sustaining the uterus of pregnancy a) Testosterone b) Progesterone c) Estradiol d) inhibin Que 14: typically ovulation occurs a) at the end of the uterine phase b) at the start of follicular phase c) during an increase of LH in the ovarian cycle d) at the middle of the luteal phase

Que 1: in women who suffer from migraine …………………. are classified menstrual migraines, which tend to be more severe and longer lasting . a) 5% – 10% b) 45% – 55% c) 20% – 50% d) 65%-75% Que 2: why are the women on average, slightly shorter than men a) They have fat then man which contributes to stature b) Their long bones are sealed and stop growing earlier than men c) Their brains are somewhat smaller than man’s brain d) Their brains are somewhat larger than man, brain que 3: menopause frequently occurs between ………………..age of year a) 25-30 b) 45-55 c) 35-40 d) 65-75 que 4: this hormone causes enlargement of the larynx and an increase in the length and thickness of the vocal cords. A) estrogen 2) cholesterol 3) progesterone 4) testosterone Que 5: the reproductive cycle includes which of the following interconnected sets of events a) Ovarian cycle b) Urinary cycle c) Placental cycle d) Female prostate cycle Que 6: high level of circulating progesterone have been associated with : a) Excessive milk production b) Ovarian cancer c) Inability to breast feed a new born child d) Pregnancy Que 7: although variations exist, ovulation typically occurs on the …………day before mensuaration a) 1st b) 14th c) 7th d) 28th Que 8: LH stimulates interstitial cells a) To decrease GnRH b) To produce FSH c) To produce testosterones d) To produce sperm Que 9:what region of the uterus is shed during menstration? a) Stratum basalis of the myometrium b) Stratum basalis of the endometrium c) Stratum functionalis of the endometrium d) Perimetrium Que 10: the phenomenon is which women living in close proximity tend to menstruate at approximately the time is called. a) Precocious puberty b) Menstrual synchrony’ c) Delayed puberty d) Ovarian synchrony Que 11.studies have shown that healthy menstruating women a) Should not participate in sports b) Often feel ill or weak when exercising c) Are able to safety engage in athletic activities d) Can contaminate others and should not engage in contacts sports. Que 12: which term below describes a chemical that resembles steroid hormones and posses threat to maintain homeostasis. a) Androgens b) Prostaglandins c) Endocrine disruptors d) All of the above Que 13: one of the primary function of ……….is preparing and sustaining the uterus of pregnancy a) Testosterone b) Progesterone c) Estradiol d) inhibin Que 14: typically ovulation occurs a) at the end of the uterine phase b) at the start of follicular phase c) during an increase of LH in the ovarian cycle d) at the middle of the luteal phase

The British thermal unit (Btu) is commonly used in engineering applications. A Btu is defined as the amount of heat required to raise the temperature of 1 lb of water by 1 °F. There are __________ joules in one Btu. 1 lb = 453.59 g; °C = (5/9)(°F – 32 °); specific heat of H2O (l) = 4.184 J/g-K. A) 3415 B) 60.29 C) 1054 D) 3 5.120 10− × E) Additional information is needed to complete the calculation.

The British thermal unit (Btu) is commonly used in engineering applications. A Btu is defined as the amount of heat required to raise the temperature of 1 lb of water by 1 °F. There are __________ joules in one Btu. 1 lb = 453.59 g; °C = (5/9)(°F – 32 °); specific heat of H2O (l) = 4.184 J/g-K. A) 3415 B) 60.29 C) 1054 D) 3 5.120 10− × E) Additional information is needed to complete the calculation.

C) 1054
Question 3 (1 point) Historically, alternative medicine has been well accepted and integrated by the mainstream medical community. Question 3 options: True False

Question 3 (1 point) Historically, alternative medicine has been well accepted and integrated by the mainstream medical community. Question 3 options: True False

Question 3 (1 point)   Historically, alternative medicine has been … Read More...
• Question 1 10 out of 10 points “Fortune lifts and Fortune fells the lucky and unlucky every day. No prophet on earch can tell a man his fate.” • Question 2 10 out of 10 points “Tell me the news again whatever it is . . . . sorrow and I are hardly strangers. I can bear the worse.” • Question 3 10 out of 10 points “Creon shows the world that of all the ills afflicting men the worst is lack of judgment.” • Question 4 10 out of 10 points “Too late, too late, you see what justice means.” • Question 5 10 out of 10 points “Take me away, quickly, out of sight. I don’t exist — I’m no one. Nothing.” • Question 6 10 out of 10 points “That will come when it comes; we must deal with all that lies before us. The future rests with the ones who tend the future.” • Question 7 10 out of 10 points “The mighty words of the proud are paid in full with mighty blows of fate, and at long last those blows will teach us wisdom.” • Question 8 10 out of 10 points “Whatever I touch goes wrong — once more a crushing fate’s come down upon my head.” • Question 9 10 out of 10 points “Believe me, when a man has squandered his true joys, he’s good as dead, I tell you, a living corpse.” • Question 10 10 out of 10 points “What should I do? Tell me . . . I’ll obey

• Question 1 10 out of 10 points “Fortune lifts and Fortune fells the lucky and unlucky every day. No prophet on earch can tell a man his fate.” • Question 2 10 out of 10 points “Tell me the news again whatever it is . . . . sorrow and I are hardly strangers. I can bear the worse.” • Question 3 10 out of 10 points “Creon shows the world that of all the ills afflicting men the worst is lack of judgment.” • Question 4 10 out of 10 points “Too late, too late, you see what justice means.” • Question 5 10 out of 10 points “Take me away, quickly, out of sight. I don’t exist — I’m no one. Nothing.” • Question 6 10 out of 10 points “That will come when it comes; we must deal with all that lies before us. The future rests with the ones who tend the future.” • Question 7 10 out of 10 points “The mighty words of the proud are paid in full with mighty blows of fate, and at long last those blows will teach us wisdom.” • Question 8 10 out of 10 points “Whatever I touch goes wrong — once more a crushing fate’s come down upon my head.” • Question 9 10 out of 10 points “Believe me, when a man has squandered his true joys, he’s good as dead, I tell you, a living corpse.” • Question 10 10 out of 10 points “What should I do? Tell me . . . I’ll obey

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In this class we’re going to explore the philosophy of non-violence that Cesar Chavez followed. It’s purpose is to stand up against injustice and remain connected to your own humanity and that of the oppressor despite your anger and even rage. We will also look at a Buddhist monk’s teaching on how we can do this on a personal as well institutional level. These bear a deeper look so that we can consider how to apply them in today’s injustices and conflicts I. “Love, Law and Civil Disobedience” speech by Martin Luther King Jr. can be found at http://bigfatgenius.com/2220%20Fall%202010/King%20-%20Love%20Law%20and%20Civil%20Disobedience.html 1.) What is your gut reaction to this reading?

In this class we’re going to explore the philosophy of non-violence that Cesar Chavez followed. It’s purpose is to stand up against injustice and remain connected to your own humanity and that of the oppressor despite your anger and even rage. We will also look at a Buddhist monk’s teaching on how we can do this on a personal as well institutional level. These bear a deeper look so that we can consider how to apply them in today’s injustices and conflicts I. “Love, Law and Civil Disobedience” speech by Martin Luther King Jr. can be found at http://bigfatgenius.com/2220%20Fall%202010/King%20-%20Love%20Law%20and%20Civil%20Disobedience.html 1.) What is your gut reaction to this reading?

Dr. Martin Luther King argued the reality that those who … Read More...
Problem 3 The force, FB, of 120 N is acting at vertex B of the equilateral triangle. The line of action of the force is collinear with side AB of the triangle. The length of each side of the triangle is 1 m.

Problem 3 The force, FB, of 120 N is acting at vertex B of the equilateral triangle. The line of action of the force is collinear with side AB of the triangle. The length of each side of the triangle is 1 m.

a) Replace force FB by a force at point A … Read More...
CHM114: Exam #1 CHM 114, S2015 Exam #1, Version B Instructor: O. Graudejus Points: 100 Print Name Sign Name Student I.D. # 1. You are responsible for the information on this page. Please read it carefully. 2. If you enter your ASU ID incorrectly on the scantron, a 3 point penalty will be assessed. 3. Code your name and 10 digit affiliate identification number on the separate scantron answer sheet. Use only a #2 pencil 4. Do all calculations on the exam pages. Do not make any unnecessary marks on the answer sheet. 5. This exam consists of 25 multiple choice questions worth 4 points each and a periodic table. Make sure you have them all. 6. Choose the best answer to each of the questions and answer it on the computer-graded answer sheet. Read all responses before making a selection. 7. Read the directions carefully for each problem. 8. Avoid even casual glances at other students’ exams. 9. Stop writing and hand in your scantron answer sheet and your test promptly when instructed. LATE EXAMS MAY HAVE POINTS DEDUCTED. 10. You will have 50 minutes to complete the exam. 11. If you leave early, please do so quietly. 12. Work the easiest problems first. 13. A periodic table is attached as the last page to this exam. 14. Answers will be posted online this afternoon. Potentially useful information: K = ºC + 273.15 Avogadro’s Number = 6.022 × 1023 particles/mole 1amu = 1.66·10-24 g 1 cal=4.184 J \ -2- CHM 114: Exam #1 1) What volume (mL) of a concentrated solution of sodium hydroxide (6.00 M) must be diluted to 200.0 mL to make a 0.880 M solution of sodium hydroxide? A) 2.64 B) 176 C) 29.3 D) 26.4 E) 50.0 2) Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: S (s) + 3 F2 (g)  SF6 (g) The maximum amount of SF6 that can be produced from the reaction of 3.5 g of sulfur with 4.5 g of fluorine is __________ g. A) 5.8 B) 3.2 C) 12 D) 16 E) 8.0 3) Of the reactions below, only __________ is not spontaneous. A) 2 2 Mg (s) 2HCl + (aq)®MgCl (aq) + H (g) B) 2 4 2 4 2 2Ni (s) + H SO (aq) ®Ni SO (aq) + H (g) C) 3 2 2Al (s) + 6HBr (aq)®2AlBr (aq) + 3H (g) D) 3 3 2 2Ag (s) + 2HNO (aq) ®2AgNO (aq) + H (g) E) 2 2 Zn (s) + 2HI (aq) ®ZnI (aq) + H (g) 4) Which solution has the same number of moles of NaOH as 40.00 mL of 0.100M solution of NaOH? A) 20.00 mL of 0.200M solution of NaOH B) 25.00 mL of 0.175M solution of NaOH C) 30.00 mL of 0.145M solution of NaOH D) 50.00 mL of 0.125M solution of NaOH E) 100.00 mL of 0.0500M solution of NaOH 5) What is the concentration (M) of a NaCl solution prepared by dissolving 9.3 g of NaCl in sufficient water to give 450 mL of solution? A) 0.35 B) 0.16 C) 0.45 D) 27 E) -2 2.7×10 -3- CHM 114: Exam #1 6) In which reaction does the oxidation number of hydrogen change? A) 2 HCl (aq) NaOH (+ aq)® NaCl (aq) + H O (l) B) 2 2 CaO (s) + H O (l) ®Ca(OH) (s) C) 4 3 4 2 2 2 2 HClO (aq) + CaCO (s) ® Ca(ClO ) (aq) + H O (l) +CO (g) D) 2 2 2 3 SO (g) + H O (l)®H SO (aq) E) 2 2 2 Na (s) + 2H O (l) ® 2 NaOH (aq) + H (g) 7) Which atom has the smallest number of neutrons? A) phosphorus-30 B) chlorine-37 C) potassium-39 D) argon-40 E) calcium-40 8) The change in the internal energy of a system that absorbs 2,500 J of heat and that has received 7,655 J of work by the surroundings is __________ J. A) -10,155 B) -5,155 C) 7 −1.91×10 D) 10,155 E) 5,155 9) When a metal and a nonmetal react, the __________ tends to lose electrons and the __________ tends to gain electrons. A) metal, metal B) nonmetal, nonmetal C) metal, nonmetal D) nonmetal, metal E) None of the above, these elements share electrons. 10) What is the oxidation number of nitrogen in HNO2? A) -5 B) -3 C) 0 D) +3 E) +5 -4- CHM 114: Exam #1 11) Elements in Group 7A are known as the __________. A) chalcogens B) alkaline earth metals C) alkali metals D) halogens E) noble gases 12) The concentration of iodide ions in a 0.193 M solution of sodium iodide is __________. A) 0.193 M B) 0.386 M C) 0.0965 M D) 0.579 M E) 0.0643 M 13) Lithium and nitrogen react to produce lithium nitride: 6Li (s) + N2 (g)  2Li3N (s) How many moles of N2 are needed to react with 1.422 mol of lithium? A) 4.26 B) 0.710 C) 0.237 D) 2.13 E) 0.118 14) The balanced equation for the decomposition of sodium azide is __________. A) 2NaN3 (s)  Na2 (s) + 3 N2 (g) B) NaN3 (s)  Na (s) + N2 (g) C) 2NaN3 (s)  2Na (s) + 3 N2 (g) D) NaN3 (s)  Na (s) + N2 (g) + N (g) E) 2NaN3 (s)  2Na (s) + 2 N2 (g) 15) A sample of CH2F2 with a mass of 9.5 g contains __________ atoms of F. A) 2.2 × 1023 B) 38 C) 3.3 × 1024 D) 4.4 × 1023 E) 9.5 -5- CHM 114: Exam #1 16) An unknown element is found to have three naturally occurring isotopes with atomic masses of 35.9675 (0.337%), 37.9627 (0.063%), and 39.9624 (99.600%). Which of the following is the unknown element? A) Ar B) K C) Cl D) Ca E) None of the above could be the unknown element. 17) The value of DH° for the reaction below is -482 kJ. Calculate the heat (kJ) released to the surroundings when 24.0 g of CO (g) reacts completely. 2 2 2CO(g) +O (g)®2CO (g) A) 3 2.89×10 B) 207 C) 103 D) 65.7 E) -482 18) Lead (II) carbonate decomposes to give lead (II) oxide and carbon dioxide: PbCO3 (s)  PbO (s) + CO2 (g) __________ grams of carbondioxide will be produced by the decomposition of 7.50 g of lead (II) carbonate? A) 1.23 B) 2.50 C) 0.00936 D) 6.26 E) 7.83 19) Combining aqueous solutions of BaCl2 and K2SO4 affords a precipitate of 4 BaSO . Which ion(s) is/are spectator ions in the reaction? A) 2 Ba only + B) K+ only C) 2 2 Ba and SO4 + − D) SO4 2- and Cl- E) K+ and Cl- 20) Which combination will produce a precipitate? A) Pb(NO3)2 (aq) and HCl (aq) B) Cu(NO3)2 (aq) and KCl (aq) C) KOH (aq) and HNO3 (aq) D) AgNO3 (aq) and HNO3 (aq) E) NaOH (aq) and Sr(NO3)2 (aq) -6- CHM 114: Exam #1 21) There are __________ sulfur atoms in 50 molecules of C4H4S2. A) 1.5 × 1025 B) 100 C) 3.0 × 1025 D) 50 E) 6.02 × 1023 22) A compound contains 38.7% K, 13.9% N, and 47.4% O by mass. What is the empirical formula of the compound? A) K2N2O3 B) KNO2 C) KNO3 D) K2NO3 E) K4NO5 23) Predict the empirical formula of the ionic compound that forms from sodium and fluorine. A) 2 Na F B) 2 NaF C) 2 3 Na F D) NaF E) 3 2 Na F 24) The mass % of Krypton in the binary compound KrF2 is __________. A) 18.48 B) 45.38 C) 68.80 D) 81.52 E) 31.20 25) The correct name for K2SO3 is __________. A) potassium sulfate B) potassium disulfide C) potassium sulfite D) potassium sulfide E) dipotassium sulfate -7- CHM 114: Exam #1

CHM114: Exam #1 CHM 114, S2015 Exam #1, Version B Instructor: O. Graudejus Points: 100 Print Name Sign Name Student I.D. # 1. You are responsible for the information on this page. Please read it carefully. 2. If you enter your ASU ID incorrectly on the scantron, a 3 point penalty will be assessed. 3. Code your name and 10 digit affiliate identification number on the separate scantron answer sheet. Use only a #2 pencil 4. Do all calculations on the exam pages. Do not make any unnecessary marks on the answer sheet. 5. This exam consists of 25 multiple choice questions worth 4 points each and a periodic table. Make sure you have them all. 6. Choose the best answer to each of the questions and answer it on the computer-graded answer sheet. Read all responses before making a selection. 7. Read the directions carefully for each problem. 8. Avoid even casual glances at other students’ exams. 9. Stop writing and hand in your scantron answer sheet and your test promptly when instructed. LATE EXAMS MAY HAVE POINTS DEDUCTED. 10. You will have 50 minutes to complete the exam. 11. If you leave early, please do so quietly. 12. Work the easiest problems first. 13. A periodic table is attached as the last page to this exam. 14. Answers will be posted online this afternoon. Potentially useful information: K = ºC + 273.15 Avogadro’s Number = 6.022 × 1023 particles/mole 1amu = 1.66·10-24 g 1 cal=4.184 J \ -2- CHM 114: Exam #1 1) What volume (mL) of a concentrated solution of sodium hydroxide (6.00 M) must be diluted to 200.0 mL to make a 0.880 M solution of sodium hydroxide? A) 2.64 B) 176 C) 29.3 D) 26.4 E) 50.0 2) Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: S (s) + 3 F2 (g)  SF6 (g) The maximum amount of SF6 that can be produced from the reaction of 3.5 g of sulfur with 4.5 g of fluorine is __________ g. A) 5.8 B) 3.2 C) 12 D) 16 E) 8.0 3) Of the reactions below, only __________ is not spontaneous. A) 2 2 Mg (s) 2HCl + (aq)®MgCl (aq) + H (g) B) 2 4 2 4 2 2Ni (s) + H SO (aq) ®Ni SO (aq) + H (g) C) 3 2 2Al (s) + 6HBr (aq)®2AlBr (aq) + 3H (g) D) 3 3 2 2Ag (s) + 2HNO (aq) ®2AgNO (aq) + H (g) E) 2 2 Zn (s) + 2HI (aq) ®ZnI (aq) + H (g) 4) Which solution has the same number of moles of NaOH as 40.00 mL of 0.100M solution of NaOH? A) 20.00 mL of 0.200M solution of NaOH B) 25.00 mL of 0.175M solution of NaOH C) 30.00 mL of 0.145M solution of NaOH D) 50.00 mL of 0.125M solution of NaOH E) 100.00 mL of 0.0500M solution of NaOH 5) What is the concentration (M) of a NaCl solution prepared by dissolving 9.3 g of NaCl in sufficient water to give 450 mL of solution? A) 0.35 B) 0.16 C) 0.45 D) 27 E) -2 2.7×10 -3- CHM 114: Exam #1 6) In which reaction does the oxidation number of hydrogen change? A) 2 HCl (aq) NaOH (+ aq)® NaCl (aq) + H O (l) B) 2 2 CaO (s) + H O (l) ®Ca(OH) (s) C) 4 3 4 2 2 2 2 HClO (aq) + CaCO (s) ® Ca(ClO ) (aq) + H O (l) +CO (g) D) 2 2 2 3 SO (g) + H O (l)®H SO (aq) E) 2 2 2 Na (s) + 2H O (l) ® 2 NaOH (aq) + H (g) 7) Which atom has the smallest number of neutrons? A) phosphorus-30 B) chlorine-37 C) potassium-39 D) argon-40 E) calcium-40 8) The change in the internal energy of a system that absorbs 2,500 J of heat and that has received 7,655 J of work by the surroundings is __________ J. A) -10,155 B) -5,155 C) 7 −1.91×10 D) 10,155 E) 5,155 9) When a metal and a nonmetal react, the __________ tends to lose electrons and the __________ tends to gain electrons. A) metal, metal B) nonmetal, nonmetal C) metal, nonmetal D) nonmetal, metal E) None of the above, these elements share electrons. 10) What is the oxidation number of nitrogen in HNO2? A) -5 B) -3 C) 0 D) +3 E) +5 -4- CHM 114: Exam #1 11) Elements in Group 7A are known as the __________. A) chalcogens B) alkaline earth metals C) alkali metals D) halogens E) noble gases 12) The concentration of iodide ions in a 0.193 M solution of sodium iodide is __________. A) 0.193 M B) 0.386 M C) 0.0965 M D) 0.579 M E) 0.0643 M 13) Lithium and nitrogen react to produce lithium nitride: 6Li (s) + N2 (g)  2Li3N (s) How many moles of N2 are needed to react with 1.422 mol of lithium? A) 4.26 B) 0.710 C) 0.237 D) 2.13 E) 0.118 14) The balanced equation for the decomposition of sodium azide is __________. A) 2NaN3 (s)  Na2 (s) + 3 N2 (g) B) NaN3 (s)  Na (s) + N2 (g) C) 2NaN3 (s)  2Na (s) + 3 N2 (g) D) NaN3 (s)  Na (s) + N2 (g) + N (g) E) 2NaN3 (s)  2Na (s) + 2 N2 (g) 15) A sample of CH2F2 with a mass of 9.5 g contains __________ atoms of F. A) 2.2 × 1023 B) 38 C) 3.3 × 1024 D) 4.4 × 1023 E) 9.5 -5- CHM 114: Exam #1 16) An unknown element is found to have three naturally occurring isotopes with atomic masses of 35.9675 (0.337%), 37.9627 (0.063%), and 39.9624 (99.600%). Which of the following is the unknown element? A) Ar B) K C) Cl D) Ca E) None of the above could be the unknown element. 17) The value of DH° for the reaction below is -482 kJ. Calculate the heat (kJ) released to the surroundings when 24.0 g of CO (g) reacts completely. 2 2 2CO(g) +O (g)®2CO (g) A) 3 2.89×10 B) 207 C) 103 D) 65.7 E) -482 18) Lead (II) carbonate decomposes to give lead (II) oxide and carbon dioxide: PbCO3 (s)  PbO (s) + CO2 (g) __________ grams of carbondioxide will be produced by the decomposition of 7.50 g of lead (II) carbonate? A) 1.23 B) 2.50 C) 0.00936 D) 6.26 E) 7.83 19) Combining aqueous solutions of BaCl2 and K2SO4 affords a precipitate of 4 BaSO . Which ion(s) is/are spectator ions in the reaction? A) 2 Ba only + B) K+ only C) 2 2 Ba and SO4 + − D) SO4 2- and Cl- E) K+ and Cl- 20) Which combination will produce a precipitate? A) Pb(NO3)2 (aq) and HCl (aq) B) Cu(NO3)2 (aq) and KCl (aq) C) KOH (aq) and HNO3 (aq) D) AgNO3 (aq) and HNO3 (aq) E) NaOH (aq) and Sr(NO3)2 (aq) -6- CHM 114: Exam #1 21) There are __________ sulfur atoms in 50 molecules of C4H4S2. A) 1.5 × 1025 B) 100 C) 3.0 × 1025 D) 50 E) 6.02 × 1023 22) A compound contains 38.7% K, 13.9% N, and 47.4% O by mass. What is the empirical formula of the compound? A) K2N2O3 B) KNO2 C) KNO3 D) K2NO3 E) K4NO5 23) Predict the empirical formula of the ionic compound that forms from sodium and fluorine. A) 2 Na F B) 2 NaF C) 2 3 Na F D) NaF E) 3 2 Na F 24) The mass % of Krypton in the binary compound KrF2 is __________. A) 18.48 B) 45.38 C) 68.80 D) 81.52 E) 31.20 25) The correct name for K2SO3 is __________. A) potassium sulfate B) potassium disulfide C) potassium sulfite D) potassium sulfide E) dipotassium sulfate -7- CHM 114: Exam #1

under the Articles of Confederation, the United states exhibited some of the same problems later witnessed in __________, 1. the European Union, 2. the united Nations, 3. the world court, 4. the north Atlantic Treaty Organization , 5. the world Trade Organization.

under the Articles of Confederation, the United states exhibited some of the same problems later witnessed in __________, 1. the European Union, 2. the united Nations, 3. the world court, 4. the north Atlantic Treaty Organization , 5. the world Trade Organization.

2.   The united nations