# why does the equation x^2=-9 has no real solution why does the equation x^2 = 9 has two solutions

56,329 questions, page 292
1. ## Conflict Management Communications

Would you say that people use warlike terms and attitudes for sports and other competitive situations because it provides a healthy substitute for real violence?

asked by Bonnie on January 26, 2010
2. ## world history

13. _______ was the first thinker to postulate that numbers are real, not abstractions. A. Hui Shih [B. Pythagoras] C. Parmenides D. Aristotle

asked by jake on October 6, 2012
3. ## college algebra

I NEED TO WRITE AN EQUATION OF THE LINE WITH THE GIVEN SLOPE AND GIVEN Y-INTERCEPT LEAVE ANSWER IN SLOPE-INTERCEPT FORM SLOPE -2/3,Y-INTERCEPT (0,5)

asked by sharon on May 28, 2011
4. ## Math

For which values is the relationship linear? Tell how you decided. Write the equation for each linear relationship x 5 10 15 20 25 30 y 20 30 40 50 50 50 I don't understand what the relationship has to do with being linear?

asked by lyndse on December 11, 2009
5. ## chemistry

The reaction described by this equation O3(g) + NO(g) -- O2(g) + NO2(g) has the following rate law at 310 K. rate of reaction = 3.0x10^6 M^-1 s^-1)[O3][NO] Given that [O3]=2.0× 10–4 M and [NO]=2.0× 10–5 M at t=0, calculate the rate of the reaction at

asked by Katie on March 23, 2012
6. ## Math

An auditorium has 400 seats. Each row in the auditorium has 16 seats. In which equation does r represent the number of rows of seats in the auditorium?

asked by Jamiyah Washington on May 17, 2016
7. ## Math

'bonnie has b stickers. first, bonnie gave away 1/6 of her stickers. Then Bonnie got 12 more stickers, and she has 47. Write an equation, involving B, the corresponds to this situation"

asked by Leigh on October 29, 2010
8. ## Chem

f 147 grams of FeS2 is allowed to react with 88 grams of O2 according to the following unbalanced equation, how many grams of Fe2O3 are produced? FeS2 + O2 → Fe2O3 + SO2

asked by Valarie on September 19, 2010
9. ## Math

A contractor's crew can frame 3 houses in a week. How long will it take them to frame 54 houses if they frame the same number each week? I have to write the equation in the form of y=mx+b Would it be: y=3x+54 y=18

asked by Patrick on October 17, 2018
10. ## math

the number of photos t.j. has on his laptop is twice as many as the amount rolando has on his laptop. write and solve a multiplication equation to find how many photos rolando has on his laptop

asked by poop on February 3, 2015
11. ## Chemistry

What would the units of the rate constant k be in a second order equation if rate was measured in mol/(L x s)and all concentrations in mol/L a)L/(mol x s) b)L2/(mol2 x s) c)L3/(mol3 x s) d)mol2/(L2 x s) I think it's b) or a)

asked by Bobz on July 25, 2010
12. ## math

the cost of a banquet is \$95.00 plus \$15.00 for each person attending. write an equation that gives total cost as a function of the number of people attending. what is the cost for 77 people?

asked by JT on November 8, 2017
13. ## Chemistry/Physics

The equation needed to solve for volumetric flow rate = flow area * velocity How do you calculate flow area when all is given is velocity 1 m/s and 6000 m^3.

asked by Angie on September 4, 2012
14. ## calculus

If an equation of motion of a particle is given by s(t)= Acos(ùt + ä), the particle is said to undergo simple harmonic motion. Find the velocity of the particle at time t. When is the velocity 0?

asked by Belinda on September 27, 2011
15. ## Chemistry

Explain with reference to the Nernst equation, how is it possible for a cell to have a positive cell potential understandard conditions but the negative cell potential under other conditions.

asked by Liliy on December 2, 2010
16. ## math

write an equation of an ellipse: Major axis 12 units long and parallel to the y-axis, Minor axis 8 units long, center at (-2,5)

asked by kelsey on April 1, 2012
17. ## math

Amaya's height is 2 inches less than 2/5 the depth of the pool, d. If Amaya is 52 inches tall, how many inches deep is the pool? I'm confused. I just need an equation in order to do this

asked by michael on February 17, 2008
18. ## Pre-Calculus

Find all solutions to the equation in the interval [0, 2pi) cos4x-cos2x=0 So,this is what i've done so far: cos4x-cos2x=0 cos2(2x)-cos2x (2cos^2(2x)-1)-(2cos^2(x)-1) No idea what to do next.

asked by Maria on March 19, 2012
19. ## geometry

Triangle PQR has vertices P(1,2), Q(25,2) and R(10,20). Find the coordinates of the centroid. Find the coordinates of the circumcenter. Find the coordinates of the orthocenter. Find the equation of the line.

asked by Ginny on April 24, 2011
20. ## Math

1. Tell whether the lines for the pair of equations are parallel, perpendicular, or neither. Y=-3/4x-2 A. Parallel B. Perpendicular* C. Neither 2. Write the equation of a line that is perpendicular to the given line and that passes through the given point.

asked by BTS on January 18, 2019
21. ## Math

Write an equation for the line that is parallel to the given line and passes through the given point. y=3x+4;(6,8) A. y=3x-10 B. y=3x+6 C. y=-3x+6 D. y=-1/3x-6 Tell whether the lines for each pair of equations are parallel, perpendicular, or neither.

asked by Anonymous on December 7, 2016
22. ## math

I have a problem. Conner's age is 4 and josh's age is 12. I need to find out how many years until conner is half of josh's age and I am not sure how to put this in equation form.

asked by Janice on October 2, 2009
23. ## algebra

A truck traveling at 16 m/s is 24 meters behind the bus at t = 0. The equation d = -24 + 16t gives the position of the truck. At what time will the truck be the same distance from the intersection as the bus? What will that distance be?

asked by sam on March 3, 2013
24. ## Chem II Oxidation Reduction

NO2 ----> NO2^-1 + NO3^-1 which N do you use? I have N being +4 on the reactant side, then as a +3 on for the NO2^-1 and +5 for the NO3^-1. Do you add the N's together on the product side? Then what about the rest of the equation? You leave out all the O,

asked by Ken on July 27, 2008
25. ## algebra

1. Imagine you are at a gas station filling your tank with gas. The function C(g) represents the cost C of filling up the gas tank with g gallons. Given the equation

asked by Anonymous on May 31, 2010
26. ## Math

Height of a Projectile. The height of a projectile is described by the equation: s(t)=144t-16t^(2) Where t is in seconds and s(t) is the height of the projectile at time t. Find when the projectile hits the ground.

asked by Ashley on October 12, 2015
27. ## math

write the slop - intercept form of the equation wiht the given slope and intercept slope:2/5 x-int=4.5 i knwo how to do it with y-int but how doyou do it with x- int?

asked by lisa on December 4, 2008
28. ## Chemistry

A solution is prepared by combining 3.72 grams of an unknown non-electrolyte with 325.0 grams of chloroform. The freezing point of the mixture is -64.10 oC, while the freezing point of pure chloroform is -63.50oC. The kf of pure chloroform is 4.68

asked by Sarah on February 7, 2019
29. ## Chemistry

1. Not sure of how to do the calculations... Make a 0.200 m solution of NaCl in a 100. mL volumetric flask. ... Solution A's question or statement is the same but with M (molarity) Is this right? The small m means molality. If it were changed to capital M,

asked by A on February 2, 2017
30. ## CHEMISTRY

1. Not sure of how to do the calculations... Make a 0.200 m solution of NaCl in a 100. mL volumetric flask. ... Solution A's question or statement is the same but with M (molarity) Is this right? The small m means molality. If it were changed to capital M,

asked by Allison on February 3, 2017
31. ## Math

1)let k and w be two consecutive integers such that k

asked by ANR on October 14, 2012
32. ## Chemistry

If 48.1 g of solid Al2S3 and 6.68 mL of liquid H2O are reacted stoichiometrically according to the balanced equation, how many grams of solid Al2S3 remain? Al2S3(s) + 6H2O(l) → 2Al(OH)3(s) + 3H2S(g) I found that the limiting reagent, .6406mol of Al2S3

asked by Judy on June 4, 2010
33. ## Algebra

I need helop!A lawn a company charges an initial fee of \$200.00 plus \$50 per hour for labor costs. If h represents labor hours and c represents the cost what is the total cost equation and how do I work this out step by step, I need to understnad this!

asked by Carla on June 8, 2011
34. ## physics

The planet Jupiter is more than 300 times as massive as the Earth But it so happens that a body would scarcely weigh three times as much on the surface of Jupiter as it would on the surface of Earth. Can you think of an explanation for why this is so?

asked by william mclaren on February 4, 2013
35. ## math

a customer went to a boutique and asks the tailor to design a table cloth in the shape of hypocycloid with the equation r(t)= cos^3 i + sin^3 j . she insists to have laces at every edge of the table cloth. calculate the lenght of laces that the tailor have

asked by anonymous on May 18, 2016
36. ## physics

The planet Jupiter is more than 300 times as massive as the Earth But it so happens that a body would scarcely weigh three times as much on the surface of Jupiter as it would on the surface of Earth. Can you think of an explanation for why this is so?

asked by william mclaren on February 4, 2013
37. ## math

The annual Salary of an electrical engineer is given in terms of the years of experience by the table below. Find the equation of linear regression for the above data and obtain the expected salary for an engineer with 45 years of experience. Round to the

asked by molly on June 19, 2010
38. ## Inter. Algebra

what is the answer to 12x squared y cubed /2xy squared +6xy * y squared +6y+9 /3y cubed +9y squared? You have not written an equation, only an algebraic function, with two variables. You need to add parentheses to clarify the order of operations. There is

asked by Andrea on December 2, 2006
39. ## HeLP MATH !!!!

The annual sales S (in billion of dollars) of oracle corporation from 2004 through 2009 can approximated by linear equation S=2.903t-1.98, 4 < t < 9, where t represent the year,with t=4 corresponding to 2004.use the model estimate the year in which oracles

asked by karie on May 27, 2014
40. ## differential calculus

ADIABATIC EXPANSION when a certain polyatomic gas undergoes adiabatic expansion,its pressure p and volume V satisfy the equation pV^1.3 =k,where k is constant.Find the relationship between the related rates dp/dt and dV/dt. this is a problem of related

asked by =) on September 16, 2014
41. ## Chemistry multiple choice

During today’s experiment we will produce hydrogen gas (H2) using zinc metal (Zn(s)) and hydrochloric acid (HCl). Which is a balanced net ionic equation illustrating this process? A. Zn (s) + 2 HCl (aq) --> Zn2+ (aq) + H2 (g) + 2 Cl- (aq) B. Zn (s) + 2

asked by Nana on December 1, 2010
42. ## Math

7. A student has received scores of 88, 82, and 84 on three quizzes. If tests count twice as much as quizzes, what is the lowest score the student can get on the next test to achieve an average score of at least 70? A. 13 B. 48 C. 70 D. 96 The correct

asked by Juan Nita 3 on December 26, 2016
43. ## Chemistry

All the noble gases except helium crystallize with fcc structures. Derive an equation relating the atomic radius to the density of an fcc solid of given molecular weight and apply it to deduce the atomic radii of the noble gases.

asked by Anonymous on January 27, 2011
44. ## statistiss

The annual Salary of an electrical engineer is given in terms of the years of experience by the table below. Find the equation of linear regression for the above data and obtain the expected salary for an engineer with 48 years of experience. Round to the

asked by john on June 17, 2010
45. ## High School Math

for the following write an equation and solve it. Terri and Nick rode their bikes toward each other starting from two towns 24 miles apart. Terri rode three miles per hour faster than Nick and they met in two hours. How fast did each person ride? I think I

asked by Mike N on September 16, 2008
46. ## Calculus 1A

The problem is: Verify the given linear approximation at a=0. Then determine the values of x for which the linear approximation in accurate to within 0.1. LN(1+x) ≈ x I found f(0) = 0 and f'(0) = 1 I have an equation: LN (1+x) -(.1) < x < LN(1+x) + 1 The

asked by Mary on April 16, 2013
47. ## Math

Blockbuster movie charges ten dollars for membership fee, and an additional three dollars and fifty cents for each movie rental. Write an equation to describe the cost, c , of renting x movies including the membership fee.

asked by Insaf on August 12, 2016
48. ## math

Which equation matches the following description?James loves making smores when he goes camping with his family.He puts half a chocolate bar on every smore.The number of chocolate bars,c,James needs is dependent on the number of smores,s,he wants to make.

asked by John on May 11, 2016
49. ## Inorganic chemistry

The thermochemical equation for the combustion of hexane is shown below. C6H14(g) + 19/2Os(g) ==> 6CO2(g) + 7H2O(g) Delta H = -4163kJ What is the enthalpy change for the combustion of 2.50g C6H14? 2.50 g/86g = .029 mol -4163kJ/.029 = -1.43 x 10^5kJ

asked by Steve on May 12, 2009
50. ## 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

asked by Anon on April 14, 2016
51. ## college

The annual Salary of an electrical engineer is given in terms of the years of experience by the table below. Find the equation of linear regression for the above data and obtain the expected salary for an engineer with 48 years of experience. Round to the

asked by Rhanda on April 26, 2010
52. ## Chemistry

Assume that you had 15 nuts (N) and 10 bolts (B). How many N2B molecules could you make by screwing two nuts onto each bolt? There are two nuts for each bolt. We have 15 nuts so we can make 7. I'm supposed to "Show all calculation for full credit." Is

asked by Trevor on March 5, 2009
53. ## MATH

liz earns a weekly salary of \$459 and \$20 per hour for each over time hour she works. this week her total pay including salary and overtime was \$559. write an equation.how many hours of overtime did liz work?

asked by CHACHIS27 on October 3, 2011
54. ## physics

Refer to the equation you derived in exercise (4). Assume that 1 y = 0.30m and 2 y = 0.10 m. What is the initial total mechanical energy if the pendulum is released from rest? What is the speed of the pendulum bob at the lowest point if the total

asked by joy on August 22, 2010
55. ## Physics

2. An 8 lb weight attached to a spring exhibits simple harmonic motion. Determine the equation of motion if the spring constant is 4 lb/feet and the weight is released 4 inches above the equilibrium position with an upward velocity of 3 feet/sec.

asked by sajja sai sravanth on October 6, 2018
56. ## Chemistry

I am trying to figure out the molecular, ionic, and net equation for this question. HCl reacts with the precipitate formed from mixing Ni(NO3)2 and NaOH . This is what I got for the molecular but it is saying it wrong. Please help. Thank you. HCl(aq) +

asked by Jamie on October 5, 2013
57. ## Chemistry

Given the balanced equation N2(g)+3H2(g)==>2NH3 Calculate: a)the volume H2 that reacts with 12L of N2 b)the volume of NH3 produced Iron 4L ofN2 c)the volume of N2 and H2 to produced 60L of NH3 Assume that all volume measurements are made under identical

asked by faisal on April 23, 2012
58. ## Algebra

The floor of a one-story building is 14 feet longer than it is wide (see figure). The building has 1472 square feet of floor space. a) Write a quadratic equation for the area of the floor in terms of w. (b) Find the length l and width w of the floor.

asked by Kristi on September 2, 2012
59. ## algebra 2

suppose you have an outdoor pool measuring 25ft by 10ft. you want to add a cement walkway around the pool. if the walkway will be 1ft thick and you have 304ft of cement how wide should the walkway be? write the quadratic equation to model the volume of the

asked by arianna on December 14, 2010
60. ## Factoring and Prime

I am still having troulbe with these. Her is another one I am stuck on. I think the prime is getting me. Factor completely or state that it is prime x^2 + 9xy + 16y^2 The factors of 16 are: 16 x 1. 8 x 2. 4 x 4. None of these add together to give 9 so it

asked by Bekki on June 13, 2006
61. ## probability and statistics

The annual Salary of an electrical engineer is given in terms of the years of experience by the table below. Find the equation of linear regression for the above data and obtain the expected salary for an engineer with 48 years of experience. Round to the

asked by Rhanda on April 26, 2010
62. ## Physical Science

Balancing Decay Reactions. Fill in the blank with the correct piece to balance the decay equation. 1. (184/74) W (4/2) He + _____ 2. (210/82) Pb______+ (206/80) Hg 3. (35/16) S  (0/-1) e + _______ 4. ________  (0/-1) e + (60/28) Ni My work: 5.

asked by DFD on December 19, 2014
63. ## Chem.

Write the balanced equation given that Mg(ClO3)2 decomposes into chloride and oxygen: 2Mg(ClO3)2 --> 2MgCl2 + 3O2 So if 0.302 grams of O2 is lost from 1.890 grams of a mixture of Mg(ClO3)2 and an inert material, what is the percentage of Mg(ClO3)2 in the

asked by Anonymous on October 2, 2012
64. ## pre-calculus 11

I have the question what is the equation of the function in the form f(x) = 1/x-c for the function with a vertical asymptote at x=1? sketch the graph. I am uncertain how I plug this into a graphing calculator. Could I substitute 1 for x and then put an x

asked by george on June 10, 2015
65. ## Physics

A boy throws a ball straight up into the air so that it leaves his hand at 11 m/s. 1) If the ball has mass 0.15 kg and the boy's arm moved through 1.5 m as he threw the ball, then what average force did he exert on the ball? Please show it step by step

asked by Anonymous on October 3, 2016
66. ## physical science

When iron metal reacts with oxygen, the reaction can form Fe2O3. Write a balanced chemical equation for this reaction, and find the number of moles of oxygen that are needed to form 6 mol of Fe2O3. Show your work.

asked by Megan on January 7, 2013
67. ## probability and statistics

The annual Salary of an electrical engineer is given in terms of the years of experience by the table below. Find the equation of linear regression for the above data and obtain the expected salary for an engineer with 48 years of experience. Round to the

asked by Rhanda on April 26, 2010
68. ## math

Jumping spiders can commonly be found in homes and barns throughout the United States. A jumping spider's jump can be modeled by the equation h = 33.3t - 16t2, where t represents the time in seconds and h is the height in feet. When is the spider's height

asked by chelsea brown on November 30, 2011
69. ## Statistics

Use the following table to answer the questions. (Give your answers correct to two decimal places.) x 1 1 3 3 5 5 7 7 9 9 y 3 2 6 1 3 3 3 2 5 3 (a) Find the equation of the line of best fit. y hat = 2.6+.1x (b) Find the ordinates y hat for the points on

asked by Tracy on June 29, 2013
70. ## Phyics

The average distance between Earth and the sun is 1.50e8 km. Calculate the average speed, in km/h, of Earth assuming a circular path about the sun. Use the equations v = 2r/T. Please ignore this question and view the question I have a few spaces above. The

asked by Jayd on August 16, 2007
71. ## Physics

Can someone help me do this? I'm not sure where to insert the numbers nor in which equation. The tires on your truck have 0.35 m radius. In a straight line, you drive 2600 m. What is the angular displacement of the tire, during this trip? Would the angular

asked by Mariam on February 22, 2018
72. ## Physics Concept

2 cars are moving in same direction in parallel lanes along a highway. At some instant velocity of car A exceeds car A exceeds the velocity of car B. Does that mean that the acceleration of A is greater than car B? Explain. ~Well I would say yes but is it

asked by ~christina~ on September 23, 2007
73. ## Chemistry

Propane (C3H8) burns according to the following balanced equation: C3H8(g)+5O2(g)→3CO2(g)+4H2O(g) Calculate ΔH∘rxn for this reaction using standard enthalpies of formation. (The standard enthalpy of formation of gaseous propane is -103.9 kJ/mol.)

asked by Anonymous on April 6, 2014
74. ## statisics

The annual Salary of an electrical engineer is given in terms of the years of experience by the table below. Find the equation of linear regression for the above data and obtain the expected salary for an engineer with 45 years of experience. Round to the

asked by Anonymous on April 19, 2010
75. ## Chem again sorry

A solution of sodium chloride in water has a vapor pressure of 18.3 torr at 25°C. What is the mole fraction of NaCl in this solution? __________ What would be the vapor pressure of this solution at 45°C? The vapor pressure of pure water is 23.8 torr at

asked by Dina on November 30, 2008
76. ## Chemistry (PLZ HELP)

1. Outline a procedure to prepare an ammonia/ammonium buffer solution. I'm confused how to start it off. This is an outline of how the steps should be: Step One - Calculate the concentration of hydronium ions in the solution that requires buffering. You

asked by Emily on May 24, 2018
77. ## English

1. Is it okay for me to open the door? [Is 'It' a dummy subject? Is 'for me to open the door' the real subject?] 2. Is it okay if I open the door? [In this sentence, is 'It' a dummy subject? Does 'It' refer to 'if I open the door'? Is 'if I open the door'

asked by rfvv on April 24, 2019
78. ## Chemistry Ap

At 20◦C the vapor pressure of pure methanol (CH3OH) is 89.0 torr and of pure water (H2O) is 17.5 torr. A solution of methanol and water has a total vapor pressure of 35.5 torr at 20◦C. Calculate the mole fraction of methanol in this solution. Assume

asked by Ethan on March 3, 2015
79. ## Chemistry Damon

1g of mixture of na2c03 and k2c03 was made upto 250ml is aqueous solution . 25ml of this solution was neutralized 20ml of hcl of unknow concentration. The neutralized solution required 16.24ml of 0.1N AGN03 for precipitation. Calculate a) the k2c03 is

asked by Ken Hung on January 12, 2014
80. ## Chemistry

I'm sorry here is another I do not understand. How do you find out exactly how much of a solution you would need to completely precipitate another compound in the reaction? We can precipitate out solid lead(II) iodide from an aqueous lead(II) nitrate

asked by Kierstin on May 10, 2016
81. ## physics

Help, the last equation given to me on previous question was incorrect and I took a 0 % on my assignment !!! A mountain-climber friend with a mass of 82 kg ponders the idea of attaching a helium-filled balloon to himself to effectively reduce his weight by

asked by christy on April 3, 2012
82. ## calculus

assume the half-life of the substance is 31 days and the initial amount is 183.9 grams. (a) Fill in the right hand side of the following equation which expresses the amount A of the substance as a function of time t (the coefficient of t in the exponent

asked by trace on September 16, 2010
83. ## Algebra

I need this question put into an equation. I have been working on this forever and cannot figure out! Please explain what you did. Thanks so much for your time! Mark sold 105 tickets for the basketball game. Each adults ticket cost \$2.50 and each child's

asked by KC on October 14, 2009
84. ## Math

A tractor tire has a diameter of 6 feet and is revolving at a rate of 45 rpm. At t=0, a certain point is at height 0. Write an equation to describe the height of the point above the ground after t seconds. The answer is apparently d=-3cos(3pi/2)t +3 But I

asked by Andrew on January 1, 2015
85. ## Finite Math

66, A clothing store sells a shirt clothing \$20 for \$33 and a jacket costing \$60 for \$93. A, If the makeup policy of the store is assumed to be linear, write an equation that expresses retail price R in terms of cost C (wholesale price). B, What does a

asked by daylo2 on January 23, 2011
86. ## math

Suppose you are in the market for a new home and are interested in a new housing community under construction in a new city. The sales represenative informs you that their are two floor plans still avaiable, and that their are a total of 56 houses

asked by tera on February 10, 2009
87. ## Chemistry

A 0.65 mole quantity of O2 occupies 4.0 L at 20.◦C. What is the final pressure exerted by the gas? 1. 0.92 atm 2. 3.9 atm 3. 6.2 atm 4. 1.1 atm 5. 0.27 atm — Initially, I got .27 atm. I got this answer by plugging in the values into the equation

asked by Dijames on April 11, 2019
88. ## physics

a jet engine moves along an expiremental track (which we call the x axis) we will treat the engine as if it were a particle. its position as a function of time is given by the equation x=At²+B, where capitol A = 2.10m/s² + B=2.80m. -determine the

asked by anonymous on July 9, 2008
89. ## math

Create a lineaer equation from your own life and then write a brief paper describing this linear function. It should relate a particular 'thing' to another 'thing'. It could be something about the amount of money you spend, the number of minutes you spend

asked by shaloo on August 8, 2011
90. ## (23.Chemistry - Science (Dr. Bob222)

An electrochemical battery made from Sn and Cu electrodes under standard conditions shows an initial voltage of V= 1.1 V. If the concentration of both Cu2+ and Sn2+ solutions is increased to 2 M from 1 M, the observed voltage will: (Hint: use the Nernst

asked by Ana on May 8, 2014
91. ## Physics

The moment of inertia of a solid uniform sphere of mass M and radius R is given by the equation I=(2/5)MR2 . Such a sphere is released from rest at the top of an inclined plane of height h, length L, and incline angle è. If the sphere rolls down the

asked by Anonymous on April 7, 2011
92. ## Chem

Carbon disulfide (CS2) reacts with excess chlorine (Cl2) to produce carbon tetrachloride (CCl4) and disulfur dichloride (S2Cl2). If 67.1 g of CS2 yields 45.2 g of CCl4, what is the percent yield? (Hint, you must first write the balanced equation.) 67.36 I

asked by Anonymous on September 26, 2012
93. ## math

a paintball is hot at a wheel that has a radius of 40 cm. it hits the very bottom of the wheel next to the road while the car is stopped at the red light. as the light turns green, the wheel rolls, and so does the paint. if it takes 3 seconds for the wheel

asked by ... on July 25, 2011
94. ## Science, Chemistry

Hess's law ____. A) makes it possible to calculate ΔH for complicated chemical reactions B) states that when you reverse a chemical equation, the sign of ΔH does not change. C) determines the way a calorimeter works D) describes the vaporization of

asked by Samantha Taylor Greenfield on May 9, 2014
95. ## Chemistry

A chemist performs an acid–base titration using 0.176 M aqueous NaOH as the titrant with 26.15 mL of 0.102 M H2SO4. The endpoint of the titration is detected using phenolphthalein as the indicator. The balanced equation for the reaction is shown below:

asked by Onye on March 4, 2018
96. ## physics

A sinusoidal wave on a string is described by the equation y = (0.169 m) sin (0.713 x - 41.9 t), where x and y are in meters and t is in seconds. If the linear mass density of the string is 10.1 g/m .. if needs values of these ( the speed of the wave is

asked by maria on October 25, 2011
97. ## MaTH Question

Write an equation for the problem & solve. There are 500 cm of trim to frame a banner. The banner is 22cm wide. How long can it be? Thanks you so much 500 x 22 = 11000 ( this gives you area) Then multiply 11000 by 2 because there are 2 sides of length.

asked by Aubrey on November 24, 2006
98. ## chenistry

this is confusing me so bad!! Nitrogen gas reacts with hydrogen gas to produce ammonia by the following equation: N2(g)+3H2(g)→2NH3(g) If you have 5.79g of H2, how many grams of NH3 can be produced? I said, 2/3 *5.79 = 3.86 but that's not the answer.. it

asked by Jennie on March 3, 2015
99. ## Physics

In a particular crash test, an automobile of mass 1295 kg collides with a wall and bounces back off the wall. The x components of the initial and final speeds of the automobile are 25 m/s and 1.5 m/s, respectively. If the collision lasts for 0.11 s, find

asked by Kevin on February 1, 2015
100. ## Chemistry

hi this seems simple but i cant figure it out. If a 0.46 kg hot copper pan lost 9.8x103 J of heat as it cooled down to 54°C, what was its original temperature? I used the 24.44 j/molK for heat capacity, is not this one? found on wikipedia: copper this is

asked by justin on August 20, 2013