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Sophie

Questions and answers by visitors named Sophie

Questions (179)

Consider a fuel cell that uses the reaction of ethanol with oxygen to produce electricity,CH3CH20H(l)+ 3O2(g)---> 2CO2(g)+3H2O
1. 5 answers
2. 8,317 views
separate this redox reaction into its component half-reactions.O2 + 4Cu-->2CuO Oxidation half-reaction: ? Reduction
1. 5 answers
2. 3,311 views
Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Zn2 ] = 0.842 M and [Ni2 ] = 0.0100
1. 4 answers
2. 5,851 views
Write the formula for a complex formed between Ni 2+ and NH3, with a coordination number of 5.Write the formula for a complex
1. 5 answers
2. 10,954 views
A _________ is a substance the body needs in order to grow and function properly.A. metabolism B. diet C. nutrient D. calorie I
1. 36 answers
2. 18,736 views
How do you find the angle of FAC when:D is in the interior of <BAE E is in the interior of <DAE F is in the interior of <EAC
1. 4 answers
2. 1,457 views
Hi! I would really appreciate it if you could help me think through these questions discussing Newton's Laws in Space...Directio
1. 1 answer
2. 980 views
What would you do given the following scenarios?1. You are the capitan of a spacecraft traveling in the far reaches of outer
1. 3 answers
2. 523 views
The solubility of benzoic acid in water is 2.56g in 100cm3 at 79 C and 0.29g in 100cm3 at 20 C. What is the minimum volume of
1. 6 answers
2. 735 views
could you put these in order of polarity please: fluorenone, fluorenol and fluorene. Thanks
1. 2 answers
2. 958 views
do all populations- micheline tires, voters, people with high blood pressue...- produce a normal curve?True or False Is this
1. 2 answers
2. 467 views
Solve the following by Factoring..5t^2 - 10t = 0
1. 1 answer
2. 390 views
Sove the equation in Rational form-2x - 4 < 10
1. 1 answer
2. 361 views
solve the following equation5x + 4y = 12 Please show work... Thank You!!!
1. 1 answer
2. 434 views
I need help with the following problem: A fabric remnant from a burial site had a 14 C:12 C ratio of 0.838 of the original
1. 1 answer
2. 375 views
The problem I have is a summation from 1 to infinity for (-1)^n/n. I have to find a partial sum that is in 0.001 of the infinite
1. 3 answers
2. 991 views
Do you change them to the or those? I think it is the, but I am not sure.Later we cooked them fish and talked about the
1. 6 answers
2. 341 views
If i wanted to shorten the word phenomenal to phenoms would it be es or just s on the end.
1. 4 answers
2. 417 views
Find the distance between P(-4,3) and the line with equation: 2x - 5y = -7a. (14√29)/29 b. 0 c. (-16√29)/29 d. (16√29)/29
1. 4 answers
2. 886 views
Find an equation of the line that bisects the obtuse angles formed by the lines with equations 3x-y=1 and x+y=-2.a. (3√2
1. 3 answers
2. 515 views
Find the ordered pair that represents the vector from A(-4.3,-0.9) to B(-2.8,0.2)? Then find the magnitude of AB.A. (1.5,1.1);
1. 4 answers
2. 3,113 views
Write an equation in slope-intercept form of the line whose parametric equations are:x = (1/2)t +2/3 and y = t - 3/4. a) y = 2x
1. 4 answers
2. 1,472 views
Find sin(sin^-1 1/4)is the answer 1/4?
1. 4 answers
2. 261 views
Find the measure of the reference angle for 400 degrees.I did the work and got 40 degrees, is this right?
1. 4 answers
2. 433 views
If α and β are two angles in Quadrant II such that tan α= -1/2 and tan β = -2/3, find cos(α+β)Work: cos(α+β) = [ 1 -
1. 6 answers
2. 775 views
For 4x^2 - 4xy + y^2 = 4 find θ, the angle of rotation about the origin, to the nearest degree?a) 27° b) 63° c) 333° d)
1. 6 answers
2. 768 views
Write the standard form of the equation of the parabola whose directrix is x=-1 and whose focus is at (5,-2)?a) (y+2)^2 =
1. 1 answer
2. 471 views
Come up with a question to these answers.Si, de Alicante. No, es médica. No, es argentina.
1. 1 answer
2. 275 views
Simplify: (-1-2i)+(4-6i)I get 3-8i and 5-8i... confused, which one is it?
1. 4 answers
2. 470 views
Use the first five terms of the trigonometric series to find the value of sin pi/12 to four decimal places.a. 0.2618 b. 0.2588
1. 2 answers
2. 522 views
The playing times of 20 songs on a top-hits radio station are recorded in the chart below.Playing Time (minutes:seconds) 3:32
1. 3 answers
2. 399 views
In a random sample of 30 tires of the same type, it is found that the average life span is 36,200 miles with a standard
1. 2 answers
2. 930 views
Jen e veux pas savoir ____ est arrive.a. ce qui b. ce que Je crois _____, je vois, C'est tout. a. ce qui b. ce que I think 1 is
1. 5 answers
2. 574 views
Part 1)Evaluate tan 7.5 Part 2) Evaluate exactly cos (-(45pi(4)))
1. 2 answers
2. 1,139 views
Some interesting facts about the euro tunnel, the eurostar and the shuttle?
1. 1 answer
2. 434 views
In how many ways can the 12 members of a volleyball team line up, if the captain and assistsant captain must remain together?
1. 5 answers
2. 3,376 views
Question 1:In the Balmer-Rydberg equation, what value of m is used to determine the wavelengths of the Balmer series? m=?
1. 5 answers
2. 3,411 views
Carbon is also removed from the atmosphere during the process of weathering. carbon dioxide combines with water to form carbonic
1. 4 answers
2. 1,657 views
what is "5x + 7 = 22" simplified? x
1. 1 answer
2. 364 views
Which has more area, the region in the first quadrant enclosed by the line x+y=1 and the circle x^2+y^2=1, or the region in the
1. 2 answers
2. 575 views
How many day in a leep year?
1. 5 answers
2. 183 views
im not quite sure what to do with this problem...the info I have: -balanced equation= (CuCl2*2H20)=>CuCl2+2H2O -initial mass of
1. 1 answer
2. 460 views
set S is composed of the square of every element of the set {-5,5}. what is S?
1. 1 answer
2. 285 views
The greatest velocity a falling object reaches is called its what?
1. 3 answers
2. 1,223 views
What happens to the rate of evaporation of a liquid after…a. a decrease in temperature b. an increase in the surface area of a
1. 2 answers
2. 530 views
Determine the equation of a curve in the xy-plane that passes through thepoint (0, 1) and has the slope x2 sin 4x at any point
1. 2 answers
2. 509 views
The tangent line to the graph of y = h(x) at the point (-6, 9) passes through the point (6, 2). Find the following values.(a)
1. 1 answer
2. 426 views
Consider the following function.f(t) = 3t2 − 3 (a) Find the average rate of change of the function below over the interval [3,
1. 1 answer
2. 780 views
Find the derivative by the limit process.6/√(8x)
1. 1 answer
2. 798 views
how do you solve a problem when you have one whole # with a whole # and fraction.this is subtracting ex: 16 -10 2/7
1. 7 answers
2. 194 views
i am doing questions and i just want to say i need help the question says____________ affects how much moisture is in the air i
1. 2 answers
2. 499 views
how do you say what is your favorite food in spanish
1. 9 answers
2. 471 views
How do you solve?3-3sinx-2cos^2(x) = 0
1. 7 answers
2. 618 views
a 60 kg person falls off a 15 kg sled moving at 2 m/s. The person doesn't move after falling. Assuming no friction with the ice,
1. 1 answer
2. 425 views
An isolated 3 kg object is moving in the positive y direction along the -y axis at 2 m/s; when it reaches the origin it breaks
1. 1 answer
2. 967 views
How many moles of oxygen molecules, O2, are required to produce 0.268 mol of K2Cr2O7? Show your work.
1. 1 answer
2. 403 views
a crate is pushed to the top of a frictionless inclined plane 15 m long with a force of 25 N.If the crate weighs 125 N, how high
1. 5 answers
2. 2,629 views
find the derivative of g(a)=sin(arcsin(9a))
1. 1 answer
2. 326 views
find the derivative of 4x(lnx+ln9)-9x+e
1. 1 answer
2. 400 views
find the slope of the tangent to the curve:y^2=x^3/xy
1. 1 answer
2. 278 views
A 2.64 L container is filled with 169 g of argon.(a) If the pressure is 10.0 atm, what is the temperature? ____K (b) If the
1. 1 answer
2. 374 views
A 2.64 L container is filled with 169 g of argon.(a) If the pressure is 10.0 atm, what is the temperature? ____K (b) If the
1. 1 answer
2. 419 views
The height , in metres, of the trajectory of a football is given by h(t)=2=28t-4.9t^2, where t is the time in height of the
1. 2 answers
2. 574 views
An engineer is desingning a parabloic arch, the arch must be 15 m high , and 6 m wide, at a height of 8 ma) determine a
1. 3 answers
2. 632 views
Did I conjugate these correctly?1.tomo-tome 2.tengo-tuve 3.es-fue 4.quiero-quise 5.deseo-deseé 6.dicen-dijeron
1. 4 answers
2. 404 views
hago-hicetiene-tuvo corremos-corrimos juego-jugué son-fueron juegan-jugaron piensa-pensó pienso-pensé entienden-entendieron
1. 4 answers
2. 360 views
1. ¿Dónde estuvo tu mama ayer?Mi Mama estuvo en la tienda. 2. ¿Tocaste un instrumento la semana pasada? Sí, yo toqué un
1. 3 answers
2. 578 views
Please check1. ¿Dónde estuvo tu mama ayer? Mi Mama estuvo en la tienda. 2. ¿Tocaste un instrumento la semana pasada? Sí, yo
1. 3 answers
2. 604 views
I made the corrections-someone yesterday redid a question but the questions shouldn't be redone-that's my homeowrk-the answers
1. 3 answers
2. 693 views
Hi, I redid some of the answers as suggested yesterday from someone who responded to my post. Could you please see if I did them
1. 6 answers
2. 713 views
How much heat is necessary to change 5 grams of water at 10 degrees celcius to water at 70 degrees celcius?
1. 3 answers
2. 331 views
A jar has eight red, nine blue, and ten green marbles. What is the least number of marbles that you can remove from the jar and
1. 2 answers
2. 979 views
A bullet is fired straight up from a gun with a muzzle velocity of 148 m/s.Neglecting air resistance, what will be its
1. 1 answer
2. 481 views
You decide to market your own custom computer software. You must invest $3,255 for computer hardware, and spend $2.90 to buy and
1. 4 answers
2. 2,196 views
In a basketball game, a regular basket was worth 2 points and a long-distance basket was worth 3 points. If there were 45
1. 3 answers
2. 2,174 views
At the Wild Thing Zoo, you can rent a motorized cart to tour the grounds for a $4 initial charge and $4 per hour. An equation
1. 3 answers
2. 643 views
What is the solution of the system of equations?y = 3x + 7 y = x – 9
1. 2 answers
2. 577 views
"How was the free-trade trial of 1849 a victory for the Metis?"Was it because the 4 Metis offenders were given mercy and it also
1. 1 answer
2. 682 views
Mercury dissolves in concentrated nitric acid, with the evolution of a reddish-brown gas, just as in the reaction shown in
1. 2 answers
2. 1,149 views
Mercury dissolves in concentrated nitric acid, with the evolution of a reddish-brown gas, just as in the reaction shown in
1. 4 answers
2. 511 views
The density of carbon in the form of diamonds is 3.51 g/cm^3. If you have a 40- carat spherical diamond, what is the diameter of
1. 3 answers
2. 1,375 views
how would tides be different if the moon revolves as fast as the earth rotate
1. 1 answer
2. 307 views
18 play baseball, 17 play basketball, 30 play neither or both. I'm trying to make a Venn diagram but don't understand how.
1. 1 answer
2. 470 views
How many grams of magnesium nitride are formed from 45.1 moles of magnesium?
1. 3 answers
2. 1,402 views
The reaction of hydrogen peroxide, sulfuric acid and lead results in the production of lead sulfate in an acidic aqueous
1. 4 answers
2. 558 views
Calculate Eo (reduction potential) for the following balanced reaction.NiO2 + 2H2O + 2Fe(OH)2 Ni(OH)2 + 2Fe(OH)3
1. 1 answer
2. 468 views
Calculate Eo (reduction potential) for the following balanced reaction.NiO2 + 2H2O + 2Fe(OH)2 Ni(OH)2 + 2Fe(OH)3
1. 1 answer
2. 385 views
Manganese dioxide reacts with bromide ions to form manganese ions and bromate ions in an acidic aqueous solution. Write the
1. 3 answers
2. 497 views
Determine the weight of Na2C2O4 which is required to react completely with 20.0ml of 0.02M KMnO4.
1. 2 answers
2. 507 views
Check all of the following statements which are TRUE for a titration.Select one or more: a. A suitable primary standard must be
1. 1 answer
2. 952 views
I know that anything to the power of 0 is 1 but I need help with these 2 questions and check my answers:(xy)^0 / (z^2a^1)=
1. 10 answers
2. 778 views
Can you please help me with my math law of exponent quesions, please check my answers, please its due very soon.
1. 1 answer
2. 459 views
please help me with the last question, are the others all correct?
1. 1 answer
2. 268 views
is this the correct answer:2m^-8n^-2/9m^2n^-6??
1. 1 answer
2. 321 views
wait...so you were talking about this question: (c^2/3d^-1)^-2I thought you were talking about this question:
1. 1 answer
2. 372 views
Two charges attract each other with a force of 3.0 N. What will be the force if the distance between them is reduced to
1. 2 answers
2. 799 views
How do you do these questions, I have all my steps until the last one:2x(2x)^2: 2x(4x^2)? Now do I multiply or add the big
1. 1 answer
2. 265 views
please help me on my questions, I have a big test tomorrow and I don't understand how to do some questions, please help me
1. 1 answer
2. 416 views
How do you do these questions, I have all my steps done until the last one:2x(2x)^2: 2x(4x^2)? Now do I multiply or add the big
1. 1 answer
2. 318 views
How do you do these questions, I have all my steps done until the last one:2x(2x)^2: 2x(4x^2)? Now do I multiply or add the big
1. 1 answer
2. 288 views

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