# morgan

Popular questions and responses by morgan
1. ## chemistry

2C2H2(g) + 5O2(g)→4CO2(g) + 2H2O(g) a. Determine the enthalpy change for the reaction. ΔH = (4(-393.5)+ 2(-241.8)) – (2(227) + 5(0)) The enthalpy change is -2511.6. b. Determine the entropy change for the reaction. ΔS = (4(213.7)+ 2(188.7)) –

2. ## Chemistry

Which of the following is an example of quantization? A. The amount of time spent in a classroom B. The number of students in a classroom C. Learning happening in a classroom D. The temperature range in a classroom What is the definition of quantization

3. ## math

A student is given a reading list of ten books from which he must select four for an outside reading requirement. In how many ways can he make his selections?

4. ## spanish

Juan oye _____ su perro Spot. Would I use a personal a in the blank or leave it as it is.

What characteristic best describes the low entropy associated with solids? A. The atoms in a solid are mostly metals. B. The atoms are held together with strong bonds. C. The atoms are arranged in a rigid structure. D. The solid has a high specific heat

6. ## Physics

A student holds a bike wheel and starts it spinning with an initial angular speed of 7.0 rotations per second. The wheel is subject to some friction, so it gradually slows down. In the 10-s period following the inital spin, the bike wheel undergoes 60.0

7. ## chemistry due soon

Which reaction shows that the enthalpy of formation of CS2 is Hf = 89.4 kJ/mol? A. C(s) + 2S(s) CS2(l) + 89.4 kJ B. C(s) + 2S(s) + 89.4 kJ CS2(l) C. C(s) + 2S(s) + 89.4 kJ CS2(l) + 89.4 kJ D. C(s) + 2S(s) CS2(l) I think the answer is a or b

8. ## physics

A fighter pilot is exposed to an acceleration of 3g in the horizontal direction during takeoff. Knowing that 1g=9.8 m/s2 and that the mass of the fighter pilot is 63.6 kg, what force (in Newtons) does the fighter pilot experience in the horizontal

9. ## Physics

The objects listed below are placed at the top of a ramp, and roll down to the bottom without slipping. Assuming that there is no air resistance, rank them in order from fastest average rolling speed to slowest. Basketball Bowling Ball Penny Wedding Ring

10. ## chemistry

The enthalpy of formation of C2H5OH is -238.7 kJ/mol. What information does this reveal about the bonds in the molecule? A. Bond formation in C2H5OH from its elements only occurs in cold temperatures. B. Bond formation in C2H5OH from its elements does not

11. ## Easy Chemistry

Which of the following processes uses a galvanic cell? A. Electroplating silver metal onto a teapot B. Purification of metals such as copper from their metal ores C. Electrolysis of sodium chloride D. Operation of a portable music player

12. ## Physics

In an Atwood machine, one block has a mass of M1 = 520 g and the other has a mass of M2 = 320 g. The frictionless pulley has a radius of 4.6 cm. When released from rest, the heavier block moves down 51 cm in 1.00 s (no slippage). What is the tension T1?

13. ## chemistry

What is the strongest intermolecular force that occurs between carbon dioxide molecules? A. London dispersion forces B. Hydrogen bond C. Covalent bond D. Dipole-induced dipole attractions I think the answer is D but I am not sure

14. ## chemistry

a) Describe how to determine if a reaction will be thermodynamically favorable. b) Describe what happens to the Gibbs Free Energy term when a chemical reaction is reversed. c) Describe how coupling reactions are used to drive an unfavorable chemical

15. ## chemistry

The figure shows a cube of air at pressure 1.0 atm above a hot surface on Earth. Contact with the hot surface causes the volume of the air to expand from 2.00 × 105 L to 2.20 × 105 L by the transfer of 8.2 × 106 J of heat. Assume the systems are

16. ## Chemistry

Carbon monoxide and chlorine gas react to form phosgene: CO(g)+Cl2(g)⇌COCl2(g) Kp = 3.10 at 700 K If a reaction mixture initially contains 319torr of CO and 220torr of Cl2, what is the mole fraction of COCl2 when equilibrium is reached?

17. ## Easy chemistry

Which statement correctly identifies how a lead-storage battery in a car works? A. The battery acts as a galvanic cell as it provides current to the radio. B. The battery acts as a galvanic cell as it is recharged by the alternator. C. The battery acts as

18. ## physics

A charge of 1.5uC is placed at the origin, and a charge of 3uC is placed at x = 1.5m. Locate the point between the two charges where the electric field is zero? Q1 P Q2 x------------*-----------. 0

19. ## Chemistry

Which of the following are excited in ultraviolet photoelectron spectroscopy? A. Valence electrons B. Core electrons C. X-rays

21. ## Chemistry

Which of the following is an example of quantization? A. The amount of time spent in a classroom B. The number of students in a classroom C. Learning happening in a classroom D. The temperature range in a classroom I know I asked this question but I would

22. ## Chemistry

The experimentally measured and generally accepted value for the molar volume of Na is about 23 cm3/mol. Which of the following best explains why the value calculated in Part B is significantly smaller than the measured values? Part B Answer 16.3 cm3/mol

23. ## Math

ABCD is a kite with AD=AB Angle A is 116 degrees Angle B is 2x degrees Angle D is (5x-147) degrees Find the smallest angle of the kite

24. ## Chemistry

Write the formulas of the compounds formed by NH4+ with the following anions: NO3−, HCO3−, SO42−, HPO42−. Express your answers as chemical formulas separated by commas. Use the given order of anions.

25. ## Chemistry

Answer the following questions about energy changes associated with heating and cooling a substance. Use the quantities in the table for your calculations. (table) Specific heat of water /4.184J/g*K dealta H vap for water /40.7 kJ/mol dealta H fus for

26. ## chemistry

A. What is the standard potential, in volts, of a galvanic cell made of Ce4+ and Cu2+, given the standard reduction potentials below? Ce4+ + e− → Ce3+ Eº = 1.61 V Cu2+ + 2e− → Cu(s) Eº = 0.34 V I think it is 1.27 V but it might be 1.95V b. How

27. ## Chemistry due soon

If the following reaction: NO(g) + 1/2O2(g) NO2(g) has the following enthalpy change: H° = -56 kJ/mol What is the enthalpy of the decomposition reaction of 2 moles of NO2? A. 112 kJ B. 56 kJ C. -56 kJ D. -112 kJ i think the answer is d

28. ## English

Select the correct verb tense used in the sentences below That company has been making surfboards since the 1960's present perfect progressive present progressive*** past perfect progressive past progressive We had been listening to the radio when the

29. ## chemistry

How many moles of magnesium chloride are formed when 55 mL of 0.70 M HCl is added to 42 mL of 1.204 g Mg(OH)2? Mg(OH)2(s) + 2HCl(aq) MgCl2(aq) + 2H2O(l) A. 0.019 mol B. 0.012 mol C. 0.021 mol D. 0.039 mol

30. ## Chemistry

a) Tetraphosphorus (P4), commonly known as white phosphorus, forms different compounds with chlorine (Cl2) depending on the amount of chlorine present. If chlorine is limited, phosphorus trichloride (PCl3) is formed. If there is an excess of chlorine,

31. ## Chemistry

a) Tetraphosphorus (P4), commonly known as white phosphorus, forms different compounds with chlorine (Cl2) depending on the amount of chlorine present. If chlorine is limited, phosphorus trichloride (PCl3) is formed. If there is an excess of chlorine,

32. ## Physics

The ocean's level is currently rising at about 1.5 mm per year. At this rate, in how many years will sea level be 3 meters higher than now? This seems like it should be a simple question but the change in measurements is confusing me.

33. ## chemistry

Are acids like ascorbic acid and palmitic acid ionic, molecular, or covalent network compounds

34. ## Chemistry

Lets say you melted palmitic acid, paraffin, and sucrose. While they be good conductors, poor conductors, or will they not be able to conduct electricity.

35. ## Chemistry

The balanced net ionic equation resulting from addition of aqueous hydrochloric acid to solid chromium(III) hydroxide is: A. Cr(OH)3 (s) + 3 HCl (aq) 3 H2O (l) + CrCl3 (aq) B. Cr(OH)3 (s) + 3 Cl- (aq) 3 OH- (l) + CrCl3 (aq) C. Cr(OH)3 (s) + 3 H+ (aq) + 3

36. ## Chemistry

You want to determine the heat of reaction when a sodium chloride solution is formed using a 10.0 g sample of NaCl(s) and 50.0 mL of water in a coffee cup calorimeter. Which of the following equations would you use? Assume the specific heat of the solution

37. ## chemistry

Which statement best describes what must occur for two atoms to combine to form a chemical bond? A. The electrons of one nucleus must transfer to the nucleus of the second atom for a chemical bond to form. B. The repulsive forces of both nuclei must

38. ## chemistry

A sodium atom when excited gives off two very specific wavelengths of visible light. What does this tell us about sodium? A. There are two principal electron transitions in sodium. B. There are two electrons in a sodium atom. C. A sodium atom has its

39. ## Chemistry

If ammonia is manufactured at 356 K, is the reaction spontaneous, given that the enthalpy and entropy change for the reaction are -93 kJ/mol and -198 J/mol K, respectively? A. Yes, the ΔG is -92 kJ/mol. B. No, the ΔG is 92 kJ/mol. C. No, the ΔG is 22.5

40. ## Physics

Two disks are rotating about the same axis. Disk A has a moment of inertia of 3.1 kg · m2 and an angular velocity of +8.0 rad/s. Disk B is rotating with an angular velocity of -10.2 rad/s. The two disks are then linked together without the aid of any

41. ## Chemistry

How long (in minutes) must a 5.40 A current be passed through an aqueous solution of zinc nitrate to deposit 87.5 g Zn?

42. ## science

Two blocks of different temperatures are brought together. Block A is a 360.0-kg block is made of Material X which has a temperature-dependent specific heat. Its initial temperature is TA = 200.0¡ã C. Block B is a 1000.0-kg iron block with an initial

43. ## Science : Physics

A 15kg object takes 26.3 meters to stop because of friction. Assume no skidding. If the frictional force is 60 N, what is the initial velocity of the object?

44. ## Chemistry

The reason that nonpolar oil will not dissolve in polar water is that the attractive forces between: A. the oil molecules are ionic and the attractive forces between the water molecules are covalent. B. the water molecules are weaker than the attractive

45. ## Chemistry

Use this reaction for this question: 4NH3 (g) + 2O2 (g) 4NO (g) + 6H2 (g); H = -905 J. Which statement is true about the reaction above? A. G is negative at all temperatures. B. S is negative and G is positive. C. S is negative and G is negative. D. G is

46. ## chemistry

If BH3 formed the trigonal planar molecule shown in the image below, which statement would best describe BH3? A. Boron does not contain a complete octet of electrons. B. BH3 would orient in an electric field. C. BH3 is a polar molecule. D. BH3 forms four

47. ## chemistry

What does the fact that a blackbody can absorb light only in specific-sized "packets" say about light? A. It has no mass. B. It is composed of electrons. C. It is composed of atoms. D. It is quantized. I have no idea what the answer is

48. ## chemistry

What is the entropy change associated with the chemical reaction that occurs when iron oxide is converted to its metal form? Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g) A. Zero B. Positive C. Negative D. Cannot be determined I think the answer is b or c.

49. ## English

Review the metric pattern in “Old Ironsides.” How does this meter reflect the poem’s subject matter? I know this is not a do your homework website. I have been on this question forever. I only know the definition to a meter. So I would really like

50. ## Chemistry

A galvanic (voltaic) cell consists of an electrode composed of aluminum in a 1.0 M aluminum ion solution and another electrode composed of fold in a 1.0 M gold (III) ion solution connected by a salt bridge. Calculate the standard potential for this cell at

51. ## Physics

15. [1pt] A thin hoop of radius r = 0.59 m and mass M = 9.2 kg rolls without slipping across a horizontal floor with a velocity v = 3.3 m/s. It then rolls up an incline with an angle of inclination θ = 31°. What is the maximum height h reached by the

52. ## Stats (probability)

Of 10 girls in a class, 3 have blue eyes. If two girls are chosen at random, what is the probability that (i) both have blue eyes, (ii) neither has blue eyes, (iii) at least one has blue eyes? I have the answers but do not know how to get them. I'm trying

53. ## math

In how many ways can an investor select five mutual funds for his investment portfolio from a recommended list of nine mutual funds?

54. ## physics

For a new TV series "Stupidity Factor contestants are dropped into the ocean (p 1030 kg/ms) along with a Styrofoam soo kg/ms block that is mm x 3 mm X 20 cm thick. If too many contestants climb aboard the block and it sinks below the water surface, they

55. ## philosophy

Russell is arguing that philosophy is valuable. You'll want to think about his argument using his own key ideas: •How does he think philosophy is different from science? •Does he think philosophy is different from science in a good or bad sense, like

56. ## Chemistry

Which of the following affects how strongly anions and cations are attracted to each other in a solid? A. The nucleus B. Empty valence orbitals C. Distance between anions and cations D. Neutrons I the answer b.

57. ## Chemistry

Which of the following is not true about molecular orbital theory? A. The bonding molecular orbital is filled before the antibonding orbital. B. Each molecular orbital can accommodate only one electron. C. The number of molecular orbitals formed is often

58. ## chemistry

Which of the following spectroscopies is/are suitable for studying materials on surfaces? A. IR and UV/V B. UV/V C. NMR D. XPS and UPS

59. ## chemistry

For an atom of sulfur, which electron would require the least amount of energy to remove from the atom? A. 3s2 B. 1s1 C. 3p1 D. 3p4 I think the answer is c or d, preferring d. What would you go with?

60. ## chemistry

Which statement describes the principal quantum number (n)? A. The quantum number that indicates the subshell occupied by an electron B. The quantum number that indicates the energy level of the electron C. A subdivision of an energy level in an atom D.

61. ## chemistry

What is ΔH in the equation ΔG = ΔH - TΔS? A. The change in specific heat between the products and the reactants B. The change in enthalpy between products and reactants in a reaction C. The change in entropy between products and reactants in a reaction

62. ## Math

A pizza is cut into 12 pieces. Describe the steps you would take to find the area of one slice of the pizza.....Help?!

63. ## biology

i am in 9th grade biology and i am REALLY confused about the difference between controll variable, responding variable, manipulated variable and controll group. any help would be great. i have a test TOMORROW!!!!

64. ## US history

Make a clear, defensible claim about the topic of the text. Write a paragraph to support your claim with clear reasons and relevant evidence from the text. Senator Bernie Sanders, an independent from Vermont, ended his presidential bid on April 8. This

65. ## Math

Evaluate the given expression. C(9,4)

66. ## computer programming

Create a Raptor Flowchart that calculates the amount a person would earn over a period of time if his or her salary were five cents the first day, ten cents the second day, and so on doubling each day. Your program should: 1. Request the number of days. 2.

67. ## Government

1. Not all resolutions need presidential approval, as do bills becoming laws. True False I think the answer is true because there are certain resolutions like joint and concurrent resolutions and joint require presidential approval while concurrent does

68. ## Chemistry

A buffer solution contains 0.052 M HC2H3O2 and 0.025 M NaC2H3O2. The pH of this solution is _____. Ka for HC2H3O2 is 1.8x10-5.

69. ## chemistry

I have questions but I don't understand this passage. Could you give a summery? Here are the question 1. One problem the researchers faced was an uncertainty about whether the signals observed in certain mass spectrometry data were, in fact, due to lead

70. ## chemistry

Given the following information about electronegativity, which binary compound would form covelant bonds with the greatest polarity? Element Electronegativity H 2.1 Li 1.0 S 2.5 Al 1.5 F 4.0 Cl 3.0 A. HCl B. LiF C. H2S D. AlH3

71. ## chemistry

Calculate the change in enthalpy produced by dissolving 14.3 g of NaOH in 65.0 g of water if the temperature increases 49.1°C and the specific heat of water is 4.18 J/g°C I believe you multiply 4.18, 65.0, and 49.1. Am I correct

72. ## Chemistry

How can the atomic orbital be described in the quantum mechanical wave model of the orbitals? A. A collection of balloons B. A circular ring C. A probability density

73. ## Chemistry

The oscillation of electrons in an antenna is an example of which type of radiation/waves/rays? A. Radio waves B. Infrared rays C. Microwaves D. VLF radiation

74. ## Chemistry

Which electron would have the highest ionization energy for an oxygen atom? A. 2nd B. 1st C. 5th D. 6th If it is the highest I was guessing b or d.

75. ## chemistry

A sample of nickel is heated to 95.0°C and placed in a coffee-cup calorimeter. If the 50.0 g of water in the calorimeter is initially 22.3°C and warms to 25.4°C, what mass of nickel was heated? (The specific heat of nickel is 0.444 J/°C g and water is

76. ## Chemistry

2. Aluminum metal reacts with zinc(II) ion in an aqueous solution by the following half-cell reactions: Al(s) → Al3+(aq) + 3e− Zn2+(aq) + 2e− → Zn(s) a. Predict the potential of the cell under standard conditions. (4 points) b. Predict whether the

77. ## pre-calc

a semicircle of radius r=3x is inscribed in a rectangle so that the diameter of the semicircle is the length of the rectangle 1. express the area A if the rectangke as a function 2 express the perimeter P of the rectamgle as a function of x

78. ## math

Write the first six terms of the arithmetic sequence with the given properties. a = 3, d = 2 a. 3,8,13,18,23,28 b. 3,5,7,9,11,13 c. 3,6,8,10,12,14 d. 2,7,12,17,22,27 e. 2,4,6,8,10,12

79. ## Geometry

Christopher wants to determine how far away a helicopter is from where he is standing. He knows the helicopter is sitting on the edge of a roof of an apartment building that is 400 feet high and 1,050 feet from where he is standing. Using the information

80. ## statistics

Consider a 90% confidence interval for μ. Assume σ is not known. For which sample size n=10 or n=20, is the confidence interval longer?

81. ## Math

Create a Raptor Flowchart that calculates the amount a person would earn over a period of time if his or her salary were five cents the first day, ten cents the second day, and so on doubling each day. Your program should: 1. Request the number of days. 2.

82. ## English

Choose the past form or the past participle for the underlined verb We /sell/ dozens of magazine subscriptions last week sold*** selled have selled no error Until this morning, they /kept/ the secrete to themselves keep keeped keeping no error*** The

83. ## Math ASAP

Order the numbers from least to greatest. 0.21, 1/5, 0.18, 24% a. 0.21, 1/5, 0.18, 24% b. 24%, 0.21, 1/5, 0.18 c. 0.18, 1/5, 0.21, 24% d. 1/5, 0.18, 0.21, 24% ** Am I right? I don't know. Please help! Thanks so much!

84. ## CHEMISTRY

Nitric acid can be produced by the reaction of gaseous nitrogen dioxide with water. 3NO2(g) + H2O(§¤) −> 2HNO3(§¤) + NO(g) If 794 L of NO2 gas react with water, what volume of NO gas will be produced? Assume the gases are measured under the same

85. ## chemistry

A particular photon has a wavelength of approximately 2 x 10-7m. What is the energy, in joules, associated with this photon? A. More information is needed. B. 4 x 10-32 C. 1 x 10-18 D. 1 x 1018 E. 1.5 x 1015

86. ## chemistry

Why is there a decrease in electron affinity going from lithium to sodium? A. There is a stronger nuclear charge, with no additional shielding electrons or number of shells. B. There are fewer spaces in the valence shell in which to place the added

87. ## chemistry

1. Write the electron configuration for each atom or ion. Then explain the distribution of electrons among energy levels. Ca, Be2+, and Br- I already found the electron configurations but I don't understand the second part of the question.(Then explain the

88. ## Chemistry

I am having some chemistry problems. 3. The graph compares the 1s orbital energies for the F atom (Z = 9), the Ne+ ion (Z = 10), and the Na++ ion (Z = 11). (the graph shows F having an Orbital Energy of 692.45, Ne+ with 47.74, and Na++ with 33.52) a. How

89. ## chemistry

What is the difference between the ionization energy of inner-shell electrons and the ionization energy of outer-shell electrons? A. The ionization energy of inner-shell electrons is less than the ionization energy of outer-shell electrons. B. They are

90. ## Chemistry

When 3.2 g of ammonium chloride is dissolved in 75 g of water, the temperature of the solution decreases from 22.8°C to 20.1°C. What is the energy of dissolution of NH4Cl per mole? (The molecular mass of NH4Cl = 53.49 g/mol, and the specific heat of

91. ## Chemistry

1. Sodium can be extracted by heating naturally occurring salt until it is molten. An electrochemical process is then used to extract the sodium. Cl2 is produced at the anode, and Na is collected at the cathode. A standard reduction potential graph for the

92. ## math

Find the angle, in degrees, between two adjacent sides of the pyramid. P(2, 0, 0), Q(2, 2, 0), R(0, 2, 0), (base points) S(1, 1, 7) (tip point)

93. ## math

In a suspension bridge, the shape of the suspension cables is parabolic. The bridge shown in the figure has towers that are 400 m apart, and the lowest point of the suspension cables is 100 m below the top of the towers. Find the equation of the parabolic

94. ## Math

Evaluate the given expression. C(9,3)

95. ## Macroeconomics

The following is a report from a BLS survey tracker: “There were 65 people in the houses I visited. Ten of them were children under age 16, 25 people had full time jobs, and 5 had part time jobs. There were 10 retirees, 5 full time homemakers, 5 full

96. ## Physics

Describe the meaning of the following terms as they are applied to waves: amplitude, frequency, wavelength. Explain how changes in one of these things would affect a light or sound wave in real life.

97. ## Physics

If you drop a hot rock into a pan of cold water what happens? Why? How about if you drop the hot rock into the Atlantic ocean?

98. ## math

Find each product mentally show the steps you use 9 x 44
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