# ANON

Popular questions and responses by ANON
1. ## Chemsitry

The Ksp of PbBr2 is 6.60× 10^–6. What is the molar solubility of PbBr2 in pure water? What is the molar solubility of PbBr2 in 0.500 M KBr solution? What is the molar solubility of PbBr2 in a 0.500 M Pb(NO3)2 solution?

2. ## Calculus

The acceleration function (in m/s2) and the initial velocity v(0) are given for a particle moving along a line. a(t) = 2t + 2, v(0) = −3, 0 ≤ t ≤ 5 (a) Find the velocity at time t. v(t) = ______ m/s (b) Find the distance traveled during the given

3. ## spanish

if you greet someone who is your age how do you ask how are you in spanish?

4. ## Chemistry

Classify each of the following as a redox reaction or a non-redox reaction. Zn+CuCl2 -> ZnCl2+Cu HCl+NaOH -> H2O+NaCl 2CO+O2 -> 2CO2 SO3+H2O -> H2SO4

5. ## Chemistry

In which of the following reactions is work done by the system to the surroundings? A) 2CH3OH(l) + 3O2(g) --> 4H2O(l) + 2CO2(g) B) S(s, rhombic) + O2(g) --> SO2(g) C) 2AgNO3(s) --> 2AgNO2(s) + O2(g) D)4Fe(s) + 3O2(g) --> 2Fe2O3(s) My guess is B because

A scientist is studying the growth of a particular species of plant. He writes the following equation to show the height of the plant f(n), in cm, after n days: f(n) = 8(1.05)n Part A: When the scientist concluded his study, the height of the plant was

7. ## Math

Susan wants to use blue, yellow, green, and pink paint to decorate her house. She needs 3 times as much blue paint as yellow paint and 1/2 as much yellow paint as green paint. She needs 3 1/4 gallons of pink paint, which is 3/4 of a gallon more than the

8. ## Math

a circle is divided into 9 equal parts. What is the angle measure of two of those parts

9. ## chemistry

How many moles of HNO3 are present if 0.236mol of Ba(OH)2 was needed to neutralize the acid solution?

10. ## Chemistry

Which one of the following compounds does not follow the octet rule? a) NF3 b) CF4 c) SF4 d) PH3 e) HCl I know I can eliminate A and B because nitrogen and carbon follow the octet rule. I know I can eliminate E because the total amount of valence electrons

11. ## chemistry

A volume of 100mL of 1.00 M HCl solution is titrated with 1.00 M NaOH solution. You added the following quantities of 1.00 M NaOH to the reaction flask. Classify the following conditions based on whether they are before the equivalence point, at the

12. ## world history

Which identify key colonial holdings that Allied power nations continued to control after World War I? Select all that apply. Britain in India Russia in Poland United States in Japan France in Vietnam I think its a and c but my text didnt explain it very

13. ## Algebra 1- Help please

Belinda wants to invest \$1000. The table below shows the value of her investment under two different options for three different years: Number of years 1 2 3 Option 1 (amount in dollars) 1100 1210 1331 Option 2 (amount in dollars) 1100 1200 1300 Part A:

14. ## Algebra 1

1.) Which best describes a system of equations that has no solution? A. Consistent, independent B. inconsistent, dependent C. consistent, dependent D. inconsistent** 2.) How many solutions does this system have? 2x+y=3 6x=9-3y A. one B. none C. infinite**

15. ## Calculus AP

f is a differentiable function on the interval [0, 1] and g(x) = f(2x). The table below gives values of f ′(x). What is the value of g ′(0.1)? x 0.1 0.2 0.3 0.4 0.5 f ′(x) 1 2 3 –4 5 The answers are: 1 2 4 cannot be determined I got 1 please let me

16. ## Chemistry

The boiling point of an aqueous solution is 102.48 °C. What is the freezing point? I know that formula for freezing point is delta Tf = Kf*m but what do I plug in for each?

17. ## Chemistry

Given H2(g) + (1/2)O2(g) --> H2O, ∆Hº = -286 kJ/mol, determine the standard enthalpy change for the reaction 2H2O(l) --> 2H2(g) + O2(g). Just checking... should end up with ∆Hº = 572 kJ/mol right??

18. ## physics

An object is moved from the outdoors, which is at a temperature of 100 ºF, to a room at a temperature of 70 º F. What happens to the object when it’s placed in the room with a lower temperature? a. The object gives off more energy than it absorbs until

19. ## Chemistry

A solution is 5.0× 10–5 M in each of these ions: Ag , SO42–, Cl–, CO32– Which precipitate will form? Ag2SO4 (Ksp = 1.12× 10–5) AgCl (Ksp = 1.77× 10–10) Ag2CO3 (Ksp = 8.46× 10–12)

20. ## Calculus

The acceleration function (in m/s2) and the initial velocity v(0) are given for a particle moving along a line. a(t) = 2t + 2, v(0) = −3, 0 ≤ t ≤ 5 (a) Find the velocity at time t. v(t) = t^2+2t-3 m/s (b) Find the distance traveled during the given

21. ## Chemistry

On another planet, the isotopes of titanium have the following natural abundances. Isotope 46Ti Abundance 70.900% Mass(amu) 45.95263 Isotope 48Ti Abundance 10.000% Mass(amu) 47.94795 Isotope 50Ti Abundance 19.100% Mass(amu) 49.94479 What is the average

22. ## world history

What was the outcome of the attempts to try Ottoman war criminals after the Armenian Genocide? Military officials were convicted and executed, but politicians were acquitted. Although more than 100 were arrested, trials were not held because international

23. ## calculus

A 5.5 foot tall woman walks at 6ft/s torward a street light that is 16.5 ft above the ground. what is the rate of change of the length of her shadow when she is 14ft from the street light? At what rate is the tip of her shadow moving? How do I get the

24. ## chemistry

A 15.27 g sample of Mo2O3(s) is converted completely to another molybdenum oxide by adding oxygen. The new oxide has a mass of 18.33 g. Add subscripts below to correctly identify the empirical formula of the new oxide.

25. ## ET3034TUx Solar Energy

Which of the following processes is used in order to fabricate mono-crystalline silicon? a) The Czochralski process b) Silicon ribbon process c) The float-zone process d) The silicon casting process

26. ## world history

How did the “stab in the back” myth contribute to the Nazi rise to power? a. The propaganda campaign allowed Nazis to use Jews as scapegoats and create a common enemy. b. The children’s story was used by Nazis to glorify the socialist system that

27. ## HVAC/R

Two technicians are discussing the HVAC/R field. Technician A says that industry codes that require certain types of installation practices carry the force of law with them. Technician B says that ANSI is an organization that establishes codes for the

28. ## Geography

What kind of map could you use to show information about a city? -a relief map -a population density map -a political boundary map -a vegitation map -All of the above You can pick as many as you want, but the question is only worth one point. I think the

29. ## AP Chem

A valid Lewis structure of __________ cannot be drawn without violating the octet rule. Answer: BeH2 Why would BeH2 break the octet?

30. ## world history

Where did a massacre of thousands of Armenians occur during the Countercoup of 1909? a. Yerevan b. Istanbul c. Adana d. Gallipoli I know it's not b, i cant seem to figure it out

31. ## Chemistry

Which of the following processes is endothermic? a) H2O (g) --> H2O (l) b) 3O2 (g) + 2CH3OH(g) --> 2CO2(g) + 2H2O(g) c) H2O (s) --> H2O (l) d) O2(g) + 2H2(g) --> 2H2O(g) I a guessing b, since energy has to go into the reaction for water to go from a solid

32. ## algebra

An equation, f, has a domain of all whole numbers and has a range of all real numbers. Does the equation represent a function? Explain why or why not.

33. ## English

Choose the word or phrase that best defines the italicized word. "An aged man is but a *paltry* thing,/ A tattered coat upon a stick..." a.inadequate b.invisible c.significant d.unwise

34. ## Classical Mechanics

Mary wants to throw a can straight up into the air and then hit it with a second can. She wants the collision to occur at height h=5.0 m above the throw point. In addition, she knows that she needs t1=4.0 s between successive throws. Assuming that she

35. ## Chemistry

Calculate the standard free-energy change for the following reaction at 25 C degrees. 2Au^3+(aq)+3Ni(s) 2Au(s)+3Ni^2+(aq) Ni2+(aq) + 2e- -> Ni(s) E=-0.26 Au3+(aq) + 3e- -> Au(s) E=+1.498 G= ? KJ Would it be G=1.758? •Chemistry - DrBob222, Sunday, March

36. ## math

We have p,q,r,s,t and u asnonnegative real numbers. (a) Show that (p^2 + q^2)^2 (r^4 + s^4)(t^4 + u^4) ≥ (prt + qsu)^4. (b) Show that (p^2 + q^2)(r^2 + s^2)(t^2 + u^2) ≥ (prt + qsu)^2. i wanna put it in cauchy-schwarz form, but i can't figure out how

37. ## math

The point-slope form of the equation of the line that passes through (–5, –1) and (10, –7) is y plus 7 equals negative StartFraction 2 over 5 EndFraction left-parenthesis x minus 10 right-parenthesis.. What is the standard form of the equation for

38. ## physics

Read the scenario. A car increases its position at a constant velocity for 5 s. Then, it stops for 5 s. Which option provides a true statement about a distance-time graph created to represent this motion? The slope of the graph would be negative and

39. ## us history

What was the main effect of the Civil War on the women's movement? A. The women's movement shifted their focus to helping widows of the Civil War. B. The movement was put on hold while women focused on anti-slavery reform and the war effort. C. The

40. ## Chemistry

Which statement is always true if ΔU sys is always negative? a) q = w b) +q>–w c) -w> +q d) +w>-q

41. ## Chemistry

(a) Calculate the molarity of a solution that contains 0.175 mol ZnCl2 in exactly 150 mL of solution. (b) How many moles of HCl are present in 35.0 mL of a 4.50 M solution of nitric acid? (c) How many milliliters of 6.00 MNaOH solution are needed to

42. ## English

In “Cranes,” why does Song-sam volunteer to escort Tok-chae to Chongdan? A. Song-sam wants to find out why his old friend is on the communists’ side. B. Song-sam wants to talk with his old friend about their childhood. C. Song-sam needs closure on

43. ## science

What is the correct order of the steps used in the scientific method? (1) conduct background research (2) formulate a hypothesis (3) pose a question (4) test the hypothesis (5) analyze the data and draw a conclusion (6) communicate the results (1) pose a

44. ## Chemistry

The enthalpy of combustion of butane C4H10 is described by the reaction: C4H10(g) + (13/2) O2(g) -> 4CO2(g) + 5H2O(g) ΔH°rxn = –2613 kJ/mol Given the following enthalpies of formation: ΔH°f[CO2(g)] = -393.5 kJ/mol ΔH°f[H2O(g)] = -241.8 kJ/mol

45. ## permutation and combination

The game of euchre uses only the 9s, 10s, jacks, queens, kings, and aces from a standard deck of cards How many five-card hands have at least two red cards?

46. ## Chemistry

Which of the following reagents would oxidize Cr to Cr2 , but not Fe to Fe3 ? Ca Co Ca2+ Br2 Co2+ Br- Which of the following reagents would oxidize Cu to Cu2 , but not Cl– to Cl2? Br2 Ca Co2+ Co Br- Ca2+

47. ## math

The graph represents a system of inequalities for the scenario where x is the number of confirmed parties on a tour and y is the number of required copies of the itinerary. Which constraint could be part of this system of equations? At least 2 copies are

48. ## Chemistry

What is the oxidation state of Cr in K2Cr2O4?

49. ## Chemistry

Sort each of the following events based on whether the solubility of the indicated gas will increase, decrease, or stay the same. Each phrase specifies the gas involved and the change in its environment. 1. The temperature is increased 2.the partial

50. ## Math

Find f. f ''(x) = 20x3 + 12x2 + 10, f(0) = 9, f(1) = 12

51. ## Chemistry

4.00 mol of solid A was placed in a sealed 1.00-L container and allowed to decompose into gaseous B and C. The concentration of B steadily increased until it reached 1.20 M, where it remained constant. A(s) B(g)+C(g) Then, the container volume was doubled

52. ## Math

Anita can clean a typical pool in 8 hours. Chao can clean a typical pool in 6 hours. How long should it take Anita and Chao working together to clean a typical pool? I'd like to know how to work out this problem in order to find the answer.

53. ## precalulus

a ship travels 60 miles due east, then adjusts its course northward. after travelling 80 miles in the new direction, the ship is 139 miles from its point of departure. calculate the ship's bearing.

54. ## Chemistry

Can someone check my answers? What is the oxidation state of each element in K2Cr2O7? K +1 Cr +6 O -2 What is the oxidation state of each element in SO32–? S +4 O -6

55. ## Chemistry

Consider an amphoteric hydroxide, M(OH)2(s), where M is a generic metal. M(OH)2 (s) M^2+ (aq) + 2OH- (aq) Ksp=4e-16 M(OH)2 (s) + 2OH- (aq) M(OH)4 ^2- (aq) Kf=0.06 Estimate the solubility of M(OH)2 in a solution buffered at pH= 7.0, 10.0, and 14.0 I'm not

56. ## Algebra 1- Urgent

The price of products may increase due to inflation and decrease due to depreciation. Derek is studying the change in the price of two products, A and B, over time. The price f(x), in dollars, of product A after x years is represented by the function

57. ## Math

which shape has 5 faces 5 vertices and 8 edges? triangular Pyramid** Rectangular pyramid Pentagonal pyramid

58. ## Chemistry

Given ∆Hºrxn = -1670 kJ/mol for 2Al(s) + (3/2)O2(g) --> Al2O3(s), determine ∆Hº for the reaction 2Al2O3(s) --> 4Al(s) + 3O2(g). I flipped Al(s) + (3/2)O2(g) --> Al2O3(s) to Al2O3(s) --> A(g) + (3/2)O2(s) and multiplied the molar values by 2. I ended

59. ## Chemistry

To treat a burn on your hand, you decide to place an ice cube on the burned skin. The mass of the ice cube is 16.0 g, and its initial temperature is -11.4 °C. The water resulting from the melted ice reaches the temperature of your skin, 31.0 °C. How much

60. ## english

A problem shared in “Balancing Calories to Manage Weight” is that environmental factors promote overconsumption of calories and discourage calorie expenditure. How well does the article present a solution to the problem? a. The article provides a

61. ## Spanish

1.Choose the correct past participle for the Spanish verb cantar. A. canté B. cantaba C. cantado D. canto C is my answer. 2. Choose the correct past participle for the Spanish verb salir. A. salía B. salió C. salido D. sale C is also my answer. Choose

62. ## Spanish

Choose the sentence which correctly says "The king doesn't like to smoke." A. Al rey no le quiere fumar. B. Al rey no le gusta fumar. C. El rey no gusta fumar. D. El rey no quiere fumar.

63. ## english

A question that is asked based on the information in Teach Every Child About Food is “Why do we need to teach our children about food?” How does Jamie Oliver effectively answer this question using persuasion? Teach Every Child About Food a. by stating

64. ## Algebra 2

A function is created to represent the amount of money in your checking account. What restrictions would be made to the domain? -The domain would include all real numbers.* -The domain would only include positive integers. -The domain would only include

65. ## chemistry

A bag of potato chips contains 575mL of air at 25.0∘C and a pressure of 765mmHg . Assuming the bag does not break, what will be its volume at the top of a mountain where the pressure is 458mmHg and the temperature is 10.0∘C?

66. ## geometry

In right triangle ABC, ∠C is a right angle, m∠B=70∘, and AB=13. sin70∘≈0.94 cos70∘≈0.34 tan70∘≈2.75 What is the measurement of BC?

67. ## physics

A boy picks up a bowling ball. Which of the following choices correctly describes the interaction between the boy and the bowling ball? a.The boy exerts an upward force on the ball, and the bowling ball exerts a downward force on the boy. Both forces are

68. ## Chemistry

Which of the following compounds has the greatest molar solubility? A) AgBr, Ksp= 5.4 x 10^13 B) Ba3(PO4)2, Ksp = 3.0 x 10^-23 C) Al(OH)3, Ksp = 1.9 x 10^-33 D) MgF2, Ksp = 7.4 x 10^-11 E) Pb(OH)2, Ksp = 1.2 x 10^-15 I know the answer for this problem is

An Internet search for information about franchise businesses will not help you find out A. the number of hours you'll have to put in. B. start-up costs. C. the variety of franchise businesses available. D. support you'll receive from the parent

70. ## chemistry

Write an equilibrium expression for each chemical equation involving one or more solid or liquid reactants or products. HCHO2(aq)+H2O(l)⇌H3O+(aq)+CHO−2(aq) Use A for [HCHO2], B for [H2O], C for [H3O+], D for [CHO−2].

71. ## Science (Chemistry)

A student mixes 35.0 mL of 2.82 M Pb(NO3)2(aq) with 20.0 mL of 0.00221 M Na2C2O4(aq). How many moles of PbC2O4(s) precipitate from the resulting solution? What are the values of [Pb2 ], [C2O42–], [NO3–], and [Na ] after the solution has reached

72. ## ET3034TUx Solar Energy

The width of the space charge region at a p-n junction is reduced by applying a voltage bias over the p-n junction. What is the correct statement on both the bias voltage and the p-n junction? a)The voltage is a forward bias and the diffusion of the

73. ## Chemistry

A 32 W (1 W = 1 J/s) lamp generates violet light at a wavelength of 420 nm. How many photons of this light will the lamp generate in 2.0 s?

74. ## Stats

A pizza parlor has 12 different toppings available for its pizzas, and 2 of these toppings are pepperoni and anchovies. If a customer picks 2 toppings at random, find the probability that neither topping is anchovies. Round your answer to four decimal

75. ## Math

Help, Divide 50 by half, and add 20. I do not understand.

76. ## Art

During which time period were artists keenly interested in using the golden ratio in their paintings? A.Baroque Period B.Oriental Period C.Futuristic Period D.Renaissance Period When the Greeks built the Parthenon its dimensions nearly matched the golden

77. ## CALCULUS

The region R is bounded by the x-axis, y-axis, x = 3 and y = 1/(sqrt(x+1)) A. Find the area of region R. B. Find the volume of the solid formed when the region R is revolved about the x-axis. C. The solid formed in part B is divided into two solids of

78. ## Chemistry

Sodium sulfate is slowly added to a solution containing 0.0500 M Ca^2+ (aq) and 0.0390 M Ag^+ (aq). What will be the concentration of Ca^2+ (aq) when Ag2SO4(s) begins to precipitate? What percentage of the Ca^2+ (aq) can be separated from the Ag^+ (aq) by

79. ## Calculus

Differentiate the following function from first principles f(x)= 5x/(3-x)

80. ## Earth Science

Which of the following statements about ozone are true? Select the two correct answers. a. Most ground level ozone is released by vehicles. b. Ozone is helpful for reducing smog levels.*** c. Ozone at ground level is harmful to human health. d. Ozone in

81. ## US History

Southwestern native tribes lived _[blank]_. Which most accurately completes the statement? on floating lake platforms nomadic lifestyles in large empires on small community farms B?

82. ## math unit 2

Ray BD bisects ∠ABC so that m∠ABD = 5y – 3 and m∠CBD = 2y +12. Find the value of y. The midpoint of Line Segment AB is (2, -9). The coordinates of one endpoint are A (4, 10). Find the coordinates of endpoint B. Find the distance between points F

83. ## chemistry

Given these reactions : X(s) + 1/2O2(g) --> XO(s) (Delta)H= -707.7 kj XCO3(s) --> XO(s)+CO2(g) (Delta)H= +381.9kj What is (delta)Hrxm for this reaction? X(s)+1/2 O2(g)+CO2(g) ---> XCO3(s) (Delta)H= ?

84. ## Physics

Three dynamics carts have force sensors placed on top of them.(cart 1, with mass of 2.2 kg, has one sensor --> cart 2, with mass of 2.5 kg, has sensors two and then three --> cart 3, with mass of 1.8 kg, has sensors four then five). Each force sensor is

85. ## Grammar-clauses

I put the underlined parts of the sentences in parentheses. William Faulkner’s The Sound and the Fury is a novel (that uses the technique of stream of consciousness). independent clause adverbial clause adjectival clause (my answer) noun clause It takes

86. ## chemistry

Calculate the pH of the resulting solution if 30.0 mL of 0.300 M HCl(aq) is added to (a) 35.0 mL of 0.300 M NaOH(aq). (b) 40.0 mL of 0.350 M NaOH(aq).

87. ## Spanish

1. Choose the correct Spanish translation for: “Vincent introduced himself to Rose.” A. Vicente me presentó con Rosa. B. Vicente presentó Rosa él. C. Vicente se presentó con Rosa. D. Vicente me presentó Rosa. 2. Choose the correct Spanish

1.)Find dy/dx when y= Ln (sinh 2x) my answer >> 2coth 2x. 2.)Find dy/dx when sinh 3y=cos 2x A.-2 sin 2x B.-2 sin 2x / sinh 3y C.-2/3tan (2x/3y) D.-2sin2x / 3 cosh 3yz...>> my answer. 2).Find the derivative of y=cos(x^2) with respect to x. A.-sin (2x) B.-2x

89. ## parts of speech

Thousands of years ago, fish were caught in nets and traps the word (in) is it a preposition in this sentence.

90. ## Chemistry

Which of the reactions are spontaneous (favorable)? a. 2H2O(g)⟶2H2(g)+O2(g) Δ𝐺=457 kJ/mol b. CH4(g)+2O2(g)⟶CO2(g)+2H2O(l) Δ𝐺=−820 kJ/mol c. 2Mg(s)+O2(g)⟶2MgO(s) Δ𝐺=−1137 kJ/mol d. C(s)+H2O(l)⟶CO(g)+H2(g) Δ𝐺=90.8 kJ/mol e.

91. ## science

Which choice correctly describes the waves in the electromagnetic spectrum? The bands within the spectrum are made of fluctuating electric and magnetic fields and have the same frequency and wavelength. The bands within the spectrum are made of fluctuating

92. ## world history

What was the outcome of the 1914 Battle of Tannenberg on the eastern front? A. The battle resulted in a stalemate as both Russian and German armies suffered heavy losses. B. Russia was decisively victorious, capturing more than 50,000 German troops and

1. Like the modernists, postmodern writers focused on subjective experience rather than objective cultural norms. (1 point) expressing or dealing with facts or conditions as perceived without distortion by personal feelings, prejudices, or

94. ## Chemistry

A possible set of quantum numbers for the last electron added to complete an atom of potassium in its ground state is a) n=4, l=0, ml=0, ms= -1/2 b) n=3, l=1, ml=0, ms= -1/2 c) n=4, l=1, ml=0, ms= +1/2 d) n=3, l=1, ml=1, ms= +1/2 e) n=4, l=2, ml=1, ms=

95. ## Chemistry

Hello, I was hoping that I could get some help with calculating the mass needed to completely react with this question. In the following chemical reaction between H2 and N2 to produce NH3, what is the mass of N2 needed to completely react with 0.65 g H2 to

96. ## math

Weights of women are normally distributed with mean 143 pounds and standard deviation 29 pounds. If 36 women are randomly selected, what is the probability that their mean weight is between 120 and 160 pounds? Round your answer to two decimal places.

97. ## us history

The idea of "conversion" is best explained as which of the following? A. the process of cultural change brought about by immigration B. the process of changing the frontier into settled communities C. the process of spreading United States territory across

98. ## Algebra

A projectile which is fired from the ground with a velocity of 960 ft/sec, at an angle of 30° above the ground, has a height at time t of h(t)=480t–16t2. Find the time when it hits the ground again.