Thursday

August 21, 2014

August 21, 2014

Number of results: 45,200

**Chemistry**

50 mL of copper(II) sulfate reacts with 50 mL of sodium hydroxide. Their concentrations are 0.3 M and 0.6 M respectively. The temperature increased to 23.6 C from 23.4 C. Determine the enthalpy change for the reaction in kJ/mol of sodium hydroxide. Q=mcΔT =(50g + 50g)(4....
*March 3, 2013 by a Canadian*

**math 115**

1.eleven applications for a certain position had the following ages. 32, 33, 25, 36, 48, 51, 28, 23, 54, 52, 45. sort them out in ascending order. 23, 25, 32, 33, 36, 45, 48, 51, 54, I picked 33 for the middle number to get the median is it correct? 2.clay is building a pen ...
*September 6, 2009 by Lea*

**Math Word Problems**

Citydog Screen Printers received two orders for a t-shirt designed for a math symposium. The first order was for 40 shirts at a total cost of $295 and the second order was for an additional 80 shirts at a total cost of $565. Each order included a shipping and handling charge. ...
*September 14, 2007 by Lisa*

**Algebra**

I am having trouble with this one Can someone please show me the steps, the pairs to plot and the asymptotic? Thank you in advance! Evaluate the logarithmic equation for three values of x that are greater than 2, three values of x that are between 1 and 2, and at x=2. Show ...
*June 16, 2010 by Kris*

**linear programming**

Brian Q Rourke, owner of The Horse & Hound Pub in Dublin, is preparing for St. Patricks Day, amd he must determine how much cider to stock. Brian sells three brands of cider on tap Murphys Blackton, and red Rye. The cost per gallon (to the pub owner) of each brand is as ...
*June 6, 2012 by uma*

**linear programming**

Brian Q Rourke, owner of The Horse & Hound Pub in Dublin, is preparing for St. Patricks Day, amd he must determine how much cider to stock. Brian sells three brands of cider on tap Murphys Blackton, and red Rye. The cost per gallon (to the pub owner) of each brand is as ...
*June 6, 2012 by uma*

**stats**

In each of the four examples listed below, one of the given variables is independent (x) and one of the given variables is dependent (y). Indicate in each case which variable is independent and which variable is dependent. I. Gas consumption; Miles driven II. Course grade; ...
*July 10, 2011 by Celest*

**managerial economics**

Suppose the inverse market demand equation is P = 80 V 4(QA+QB), where QA is the output of firm A and QB is the output of firm B, and both firms have a constant marginal constant of $4. Firm B is the Stackelberg leader in this market. (a)State the reaction function for firm A...
*September 7, 2008 by jenny*

**Botany**

Choose the correct option: The strongest evidence in favour of DNA as genetic material comes from - 1) Griffith effect 2)Conjugation 3)Taylor's experiment 4)Caim's effect
*June 14, 2011 by Shivangi*

**Economics.**

What does, "What are two strategies might you employ in order to create and maintain a high demand for stained glass windows. Be sure to consider what would work best for your targeted customer base." mean? NOTE: My targeted customers are: In their middle to older age Any ...
*October 20, 2013 by Nicole*

**O.CHEM -> PLEASE CHECK!!**

Arrange the compounds in the order of increasing boiling point ***(LOWEST first): 1) H3C-O-CH3 2) H2O 3) CH3CH2OH 4) CH3CH2SH I think the order should be: #1, 4, 3, 2 Arrange the following in order of increasing rate of reactivity with conc.HBr ***(LEAST first). a) ...
*March 12, 2008 by K*

**amth/algebra**

can someone help me with simplification: 20/5 - 1/5 my first answer is 1/5 my second answer is 10 -5/5 but the answere I have to choose from are: (a) 20 - 55/5 (b) 20 - 5/5 (c) cannot be simplified (d) 1/55 which is correct and if I'm not where did I go ...
*July 29, 2007 by dee*

**English**

We were asked to pick 3 literary elements and explain how they can be affected by setting. I have protagonists and antagonists as one, that they can change due to not being completely rounded just yet - basically in the sense that the characters kind of create themselves as ...
*January 9, 2014 by Me*

**Chem**

What is the enthalpy for the following reaction? overall: C2H4+H2O--->C2H5OH is -1411kJ correct??
*November 4, 2010 by Angel*

**chemistry**

Write down the correct mechanism for the reaction between 3-methyl-2-pentene and HCL?
*February 18, 2011 by ben*

**calcus/ math**

Nick has enough wire to construct a 100m of fence. he wish to use it to form three sides of a rectangular garden,one side is along his building. 1)What dimensions should be choose in order to enclose the largest possible area? 2)Verify the result thus obtained by graphical ...
*December 28, 2010 by Jessy*

**SS8R: Robber Baron or Captains of Industry Project**

Create a PowerPoint about your Captains of Industry (min. 7 slides) I chosen Andrew Carnegie, John D. Rockefeller, and Cornelius Vanderbilt for me previous assignment (that's why I ask you those questions about them). Now I have to choose ONE OF THEM to do my project. In my ...
*November 1, 2012 by Laruen*

**Chemistry**

time(s) 30 60 120 180 240 300 420 480 t(*c) 13.8 13.8 13.9 13.1 14.2 14.3 14.5 14.7 14.8 b. if t1= 24.5*c, T2= 1.5*C, tr= 23.6*c, and with the tf obtained from the plot, determine Ccal, in J/*C, if the procedure descrived in the laboratory is followed. 3.when 0.600g of metal ...
*April 14, 2011 by Daniel Medaris*

**Math Site**

Is there an online site that talks about Linear Relations thoroughly. Could you please post links to some. I tried going to mathisfun. c o m , because that is usually the only site which explains everything well and fits everything into my head; unfortunately, linear relations...
*April 19, 2010 by Sara*

**Linear Programming**

OKay My question is: Two factories manufacture 3 different grades per paper. the company that owns the factories has contracts to supply at least 16 tons of low grade, 5 tons of medium grade, and at least 20 tons of high grade paper. It cost $1000 per day to operate the first ...
*October 16, 2009 by Deanna*

**Statistics**

The following linear equation, y = b0 + b1x, is a regression line with y-intercept b0 and slope b1. Define These Terms 1) correlation coefficient 2) Linear regression equation
*May 19, 2011 by Leslie*

**Physics**

Find the angular velocity of a clock's second hand and the linear speed and linear acceleration of a point on the second hand 1.96 cm from the rotation axis.
*March 26, 2012 by Alex*

**Physics**

Find the angular velocity of a clock's second hand and the linear speed and linear acceleration of a point on the second hand 1.96 cm from the rotation axis.
*March 26, 2012 by Alex*

**Physics**

Find the angular velocity of a clock's second hand and the linear speed and linear acceleration of a point on the second hand 7.54 cm from the rotation axis.
*October 21, 2012 by Pat*

**statistics**

Given the following scatter diagram , the sample correlation coefficient r: Has a positive linear correlation Has a negative linear correlation. Has little or no correlation. Looks close to + 1.00
*August 19, 2010 by Karen*

**physics**

A soccer ball of diameter 32 cm rolls without slipping at a linear speed of 2.4 m/s. Through how many revolutions has the soccer ball turned as it moves a linear distance of 16 m?
*October 27, 2010 by linda*

**physics**

A soccer ball of diameter 30 cm rolls without slipping at a linear speed of 3.1 m/s. Through how many revolutions has the soccer ball turned as it moves a linear distance of 15 m?
*February 23, 2011 by Tin*

**physics**

A soccer ball of diameter 29 cm rolls without slipping at a linear speed of 3.6 m/s. Through how many revolutions has the soccer ball turned as it moves a linear distance of 18 m?
*October 5, 2011 by kat*

**Linear algebra**

Consider for every real number a the linear system of equations: { x +( a + 1 )y + a^2 z = a^3 { ( 1 - a )x +( 1 - 2a )y = a^3 { x +( a + 1 )y + az = a^2 b)Find the values of a for which the system has no solution, infinitely many solutions, and a unique solution
*April 27, 2014 by Elissa*

**math**

what does linear an nonlinear functions mean? I need help asap please i am begging you because i am a new student at this school and i don't get what the difference is between linear and nonlinear functions.
*May 2, 2014 by jayla*

**chemistry**

A balanced equation that represents an overall cell reaction is shown. Choose the cell notation which corresponds to the electrochemical cell that is described by this equation. 2H2O(l) → 2H2(g) + O2(g) i dont get why the answer is this. How can OH- appear in both sides ...
*June 3, 2010 by eng*

**chemistry**

The reaction between 0.045 g of calcium with an excess of water was carried out in an ice calorimeter as used in this lab. The volume of water in the calorimeter decreased by 0.18 mL during the reaction a) Write the equation for the reaction which occurs. Is it a redox ...
*November 10, 2008 by Anonymous*

**Math - PreCalc (12th Grade)**

Which statement is true for any linear system of two equations in two variables? A) The system is independent if the slopes of the two lines are equal. B) The system is inconsistent if the y-intercepts of the two lines are equal. C) The system is independent if the graphs of ...
*March 20, 2014 by Shawna*

**chemistry**

follows first-order kinetics and has an activation energy of 244 kJ mol-1. At 684 K, k = 0.00000508 s-1. What is the half-life (min) for this reaction at 427 C ? Round your answer to 3 significant figures. I really dont know what to do
*November 19, 2010 by bobjahng2*

**Chemistry**

The reaction OH- + NH4+ = H20 + NH3 is kinetically first order in both reactants' concentrations. The rate constant is 2e10 1/M s. If 50 ml of .01 M NaOH is mixed with 50 ml of .01 M NH4CL, find the time required for the OH- concentration to reach 1e-4 M.
*March 19, 2014 by Anonymous*

**statistics**

In each of the four examples listed below, one of the given variables is independent (x) and one of the given variables is dependent (y). Indicate in each case which variable is independent and which variable is dependent. I. Rainfall; Crop yield II. Ability to concentrate; ...
*September 29, 2012 by Anonymous*

**General chemistry**

The first-order reaction, SO2Cl2---> SO2 + Cl2, has a rate constant equal to 2.20 x 10^-5 s^-1 at 593 K. What percentage of the initial amount SO2Cl2 will remain after 6.00 hours?
*April 26, 2010 by hahaha*

**maths calculus**

A centre enters students for English levels one and two end test every year. Some take the paper based version, others online version. For planning purposes you need to assume trend patterns indicate that .the total number of entries each year is always more than 50 .the ...
*February 26, 2007 by jigna*

**chemistry**

Why are all diatomic molecules diatomic molecules linear, regardless of the number of valence electron pairs on the atom? i dont understand this question what is meant by linear?
*April 8, 2009 by lyne*

**math/linear equation**

Good morning. I have a question that I'm stuck on. I need to determine if the relationship represented is linear and if it is, then I need to write an equation for it. Help is deeply appreciated. For x- 2,4,7,10,12,20 For y- 5,7,10,13,15,23
*July 30, 2010 by jesup*

**physics- electrodynamics**

can someone walk me through this --- you'd be a lifesaver a rectangular pipe running parallel to the z axis(- to +) has 3 grounded metal sides at y=0, y=a and x=0. the fourth side at x=b is maintained at a specified potential v0(y). a. Develop a general formula for the ...
*August 5, 2007 by jake*

**Physics**

In my lab of linear expansion, I need to find out the coefficient of linear expansion. The data I got for an aluminum rod are initial length is 59.7cm, the change in length is 95mm, the change in temperature is 75.4 Celsius degrees. I converted 59.7cm to 0.597m, and 95mm to 0....
*June 13, 2011 by Lynn*

**Math**

Use a ruler to create a 6" x 8" rectangle. Cut rectangle on a diagonal. Use the two triangles to create four new shapes. List the most specific shape and its perimeter
*January 13, 2011 by Anne*

**chemistry**

10.0 grams of carbon dioxide and 20.0 grams of oxygen are mixed in a 50.0 L container at 30.0 degrees celcius. What is the pressure of this mixture in mm Hg? I defined my variables. so i had Mass=30.0g Volume=50.0L Temperature=303 Kelvin pressure=x. then i used PV*GFM=mRT. (x...
*March 18, 2008 by Miley*

**dog behavior**

please check answer thanks Modeling is a training technique that involves A. providing one dog as an example for another dog to follow B. giving positive reinforcement for correct behavior C. using dependent and independent variables in an experiment D. habituating a dog to a ...
*April 8, 2008 by Anonymous*

**english**

Are my solutions right?? 1. "There's someone knocking at the door! Who can it be at this time of night?" "___ Helen. She said she might come round to watch the midnight movie on TV." A: That's going to be; B: That'll be; C: It's due to be. I choose A and B 2."I've just ...
*October 26, 2012 by Minnie*

**Chemistry**

For the reversible, one-step reaction A + B ARROW C + D, the forward rate constant is 35.9 1/(Mh) and the rate constant for the reverse reaction is 25.4 1/(Mh). The activation energy was found to be 33.0 kJ/mol for the forward reaction and 45.6 kJ/mol for the reverse ...
*June 13, 2012 by parker*

**Chemistry**

One enzyme- catalyzed reaction in a biochemical cycle has an equilibrium constant (K1) that is 10 times the equilibrium constant (K2) of a second reaction. If the standard Gibbs energy of the former reaction is - 300 kJ mol-1, what is the standard reaction Gibbs energy of the ...
*April 10, 2012 by harry*

**Elem. Ed.**

Portfolios are a collaborative effort in that: A. children,teachers,and specialists can all choose samples to include in a portfolio. B. each item in the porfolio should be discussed with parents before it is included. C. teachers must have input from other teachers in the ...
*April 10, 2007 by Keisha*

**math **

If you earn the grades of 81, 84, 78, 80 in four tests what should your final tests score be in order to have an average of 81%? .81x400=324 Need a total of 324 pts Test grades so far 81,84,78,80 = 323 324-323=1 You need at least one more point in order to have an average of ...
*September 9, 2009 by Anonymous*

**Chemistry**

I'm doing chemical equilibrium, and there's a question in my lecture notes. Can someone check my answers and tell me if i'm right or wrong? Thanks! The Kc expression for this reversible reaction: 3Fe(s) + 4H2O (g) --><-- Fe3O4(s) + 4H2 (g) is [H2]^4 / [H2O]^4 Am I ...
*September 10, 2010 by Riley*

**chemistry**

Calculate the cell potential for the following reaction as written at 51 degrees C, given that [Zn2+] = 0.837 M and [Sn2+] = 0.0180 M. Zn(s) + Sn^2+(aq) = Zn^2+(aq)+Sn(s) E = __ V Reduction Half-Reaction Standard Potential Ered (V) Zn2+(aq) + 2e → Zn(s) 0.76 Sn2+(aq...
*June 7, 2012 by Katherine*

**Chemistry**

Question asking about how enzymes affect the rate of a reaction. Check all that apply 1. They shift the reaction equilibrium towards the products. 2. They increase the concentration of the reactants. 3. They lower the activation energy of the reaction. 4. They decrease the ...
*February 20, 2013 by Patrick*

**ANYBODY HERE?????????????????????????????????**

PLEASE ANSWER MY QUESTION! THANK YOU! WHAT IS A PLOT? A plot (in mathematics and engineering) is a graph. It geography, it is a piece of land. In a cemetery, it is a grave site. It can also be a covert plan of action or conspiracy. In English a "plot" can be the form a story ...
*December 23, 2006 by TANU*

**science**

a) calculate the heat of reaction, in kilojoules, for the reaction: 2NO2(g) + 3H2(g)--->2NH3(g) + 2O2(g) b) is the reaction endothermic or exothermic? how can you tell? I will be happy to critique your work on this. You will have to look up the heats of formation.
*January 18, 2007 by michelle*

**chem hw**

Assuming equal concentrations, rank these aqueous solutions by their freezing point: Li2SO4, Li3PO4, SnCl4, NH4Br. (from highest freezing point to lowest freezing poinT) Is the order Li3PO4, Li2SO4, SnCl4, and NH4Br???????? If not what is the correct order?
*February 19, 2012 by Amy*

**Algebra**

Juan is 8 years older than his sister Rosa.One day, Juan tells Rosa he is twice her age, but will only be twice her age for one year.To figure out the ages of Juan and Rosa you must first identify the variables. What are the variables in this problem?
*September 16, 2010 by Mariah*

**Math**

A 12% solution and a 24% solution are to be mixed to create 80 mL of a 16% solution. How much of each should be used? Is the correct answer 53 1/3 L of the 12% solution and 26 2.3 of the 24% solution?
*February 12, 2013 by Alyonka*

**Spanish**

I'm doing my work but i don't get these three questions at all. Could you explain them as well? ★Which part of this sentence is not correct? Esta muchacha tan bonito es alta. A. Esta B. bonito ✔C. muchacha ★Choose the correct verb for tastes in the following...
*June 4, 2014 by Jamie *

**Algebra2(check answers)**

Will someone please check my answers? 1)Ping is deciding what to choose for dinner from a menu. He can choose 1 of 4 pasta meals, 1 of 6 chicken meals, or 1 of 3 fish meals. How many ways can Ping choose a dinner meal? a)13<---- b)18 c)27 d)72 2) How many permutations are ...
*June 18, 2012 by Anonymous*

**a**

For a fixed rate, a fixed principal amount, and a fixed compounding cycle, the return is an exponential function of time. Using the formula, , let r = 10%, P = 1, and n = 1 and give the coordinates (t, A) for the points where t = 0, 1, 2, 3, 4. Round your answer to the ...
*March 8, 2007 by Jade*

**science**

'the scale of a mercury-in-glass thermometer is linear. one such thermometer has a scale extending from -10 degrees Celsius to 110 degrees Celsius. the length of the scale is 240mm.' what is linear? what is meant when the question said the scale is linear? how do i calculate ...
*January 17, 2007 by minerva*

**Health**

is this sentence correct?: Gambling is a form of game that is played for fun or in order to win by chance in faith of luck
*November 12, 2010 by Beauty*

**math**

if a set of six books is placed randomly on a shelf, what is the probability that they will be arranged in either correct or reverse order?
*October 3, 2011 by Katie*

**chemistry**

The following reaction is a single-step, bimolecular reaction: CH3Br + NaOH --> CH3OH + NaBr When the concentrations of CH3Br and NaOH are both 0.135 M, the rate of the reaction is 0.0070 M/s. (a) What is the rate of the reaction if the concentration of CH3Br is doubled? (b...
*March 24, 2012 by katie*

**psychology**

To gain acceptance, ahypothesis must be: a. suggested by a credible authority. b. kept secret until the research is completed. c. imaginative and appealing. d. backed by empirical evidence. i choose the answer d is that correct. ASsp
*May 3, 2013 by kaye*

**Math**

Use differential, i.e., linear approximation, to approximate (125.4^(1/3)) as follows: Let f(x)=x^(1/3) . The linear approximation to f(x) at x=125 can be written in the form y=mx+b where m is: m=1/75 b=? How do I find b?
*July 19, 2008 by Blair*

**Physics**

Engineers are trying to create artificial "gravity" in a ring-shaped space station by spinning it like a centrifuge. The ring is 100m in radius. How quickly must the space station turn in order to give the astronauts inside it weights equal to their weights at the earth's ...
*November 27, 2011 by Hayli*

**Physics**

Engineers are trying to create artificial "gravity" in a ring-shaped space station by spinning it like a centrifuge. The ring is 100m in radius. How quickly must the space station turn in order to give the astronauts inside it weights equal to their weights at the earth's ...
*November 27, 2011 by Hayli*

**Geography check**

My question is what country's capital is in the terra fria zone and there are 3 answers, I dont know which one is correct. They are Mexico, Colombia, and Ecuador. Can you please help me choose the right one?
*April 19, 2011 by Alyonka*

**english**

5. Choose the sentence that has a subject complement. A. I felt much better. [B. The nurse felt my pulse.] C. The day ended with many surprises. D. We can't leave without seeing her. is my answer correct
*January 3, 2012 by jake*

**ENGLISH**

Choose the correct vocabulary word for the following sentence: We know the stranger came from a distance because of the _______ he spoke. (1 point) criteria figurative language dialect I THINK IT IS DIALECT?
*October 31, 2012 by Deborah*

**Science 1 question**

Choose and describe 2 interesting uses of electricity. I chose an electric car but im having trouble choosing the other one. Please give me good examples so I could choose. Thanks :)
*April 10, 2013 by Olly*

**Chemistry**

1) The order of the boiling points for the hydrogen halides, except for HF, is HI > HBr > HCl. The reason for this order can be attributed to a) the relative covalent bond strengths. b) differences in hydrogen bonding. c) differences in dipole-dipole attractions. d) ...
*January 29, 2012 by Hannah*

**English**

Can someone help me with these questions please. Bret Harte "Plain Language from Truthful James" 1. What was the major theme in this poem? 2. What can we learn from the characters in the poem about the people of this time period. 3. What lesson can be learned from the plot if ...
*February 22, 2013 by bs*

**Chemistry 2**

For a second order reaction A <--> B, calculate the t1/2 (half life) and the k(constant) and also fill in the blanks. A (concentration) t(time) 20 0 sec 10 ? 5 40 sec 3 ? ? 200 sec t1/2=? k=?
*March 3, 2014 by Ivan *

**Calculus Help Please!!!**

Verify the given linear approximation at a = 0. Then determine the values of x for which the linear approximation is accurate to within 0.1. (Enter your answer using interval notation. Round your answers to three decimal places.) fourth root of (1 + 2x)≈ 1 + (1/2)x
*March 30, 2014 by JYoung*

**Algebra**

Is my answer correct? Evaluate the exponential equation for three values of x greater than -4, three values of x smaller than -4, and at x = -4. Show your work. Use the resulting ordered pairs to plot the graph. State the equation of the line asymptotic to the graph (if any). ...
*June 15, 2010 by Bobby*

**Angular acceleration**

Appreciate if someone can advise on how to calculate the following: A hoist lifts a 3.5kg load from rest, and has a final velocity of 2 m/s after 4 seconds. The motor can develop a torque of 4 Nm. Determine: i) The linear acceleration of the mass. ii) The angular acceleration ...
*March 24, 2007 by BIGEYE*

**Chemistry - Chemical Kinetics**

1) if the concentrations of trace constituients of the atmosphere are expressed in molecules/cm3 , what would be the units of reaction rate???? i think the ans is molecules/cm3 per seconds since the usual units of reaction rate is mol per dm3 per seconds.....am i correct?
*January 30, 2011 by Davia*

**Math**

One student studied for 8 years in college and her tuition bills are recorded. Years. One semester tuition 1. 4680 2. 4960 3. 5510 4. 6060 5. 6845 6. 7600 7. 8435 8. 9250 Construct the scatter plot for the data with the scales.choose 3 points,find a quadratic equation in ...
*December 15, 2012 by Praphul*

**chemistry**

What is the correct balanced redox reaction for the cell shown below?Fe(s) | Fe2+(aq) || Co2+(aq) Co3+(aq) | Pt
*February 1, 2011 by Anonymous*

**chemistry**

True statement for Catalyst ___________ I. make a spontaneous reaction is not spontaneous II. accelerate the reaction forward and slow reverse reaction III. lowering the activation energy of the forward reaction IV. lowering the activation energy of the reverse reaction
*April 6, 2013 by Mega*

**English**

Which one of the following is an open-ended question or statement? A. Name your brothers and sisters. B. If you could have anything you wanted to eat,what would it be? C. If you had a choice to live in Florida or Hawaii,which would you select? D. Do you like the color orange ...
*November 27, 2006 by Marvlyn*

**Physics**

Three solid cylinder rods roll down a hill with the same linear speed. Rod R1 has a 1inch diamter, Rod R2 has a 2inch diameter, and Rod R3 has a 3inch diameter. They all have the same masses. Rank in order the rotational energies of R!, R2, and R3. a. E1 > E2 > E3 b. E3...
*April 22, 2009 by Sandy*

**Physics**

Three solid cylinder rods roll down a hill with the same linear speed. Rod R1 has a 1inch diamter, Rod R2 has a 2inch diameter, and Rod R3 has a 3inch diameter. They all have the same masses. Rank in order the rotational energies of R!, R2, and R3. a. E1 > E2 > E3 b. E3...
*April 22, 2009 by Sandy*

**Physics**

Three solid cylinder rods roll down a hill with the same linear speed. Rod R1 has a 1inch diamter, Rod R2 has a 2inch diameter, and Rod R3 has a 3inch diameter. They all have the same masses. Rank in order the rotational energies of R!, R2, and R3. a. E1 > E2 > E3 b. E3...
*April 22, 2009 by Sandy*

**Chemistry**

A chemist is producing copper(II) chloride using the following reaction: Cu(s) + Cl2(g) --> CuCl2(s) In one reaction, the chemist uses 15.0 g of copper metal and 10.0 g of chlorine gas as reactants. When the reaction reaches completion, 16.0 g of copper(II) chloride has ...
*September 1, 2009 by Mercedes*

**Ivytech**

There are 7 multiple choice questions on an exam, each with 4 possible answers. If you are guessing, so that you are likely to choose 1 sequence of answers as another, what is the probability of getting all 7 answers correct?
*February 5, 2014 by Cresha*

**science**

12. Aluminum in blood plasma was shown to undergo a first order elimination reaction with a half-life of 160 days. If the initial concentration was 8.2 g/L, how long will it take for the concentration to drop to 2.5 g/L?
*February 13, 2011 by dan*

**chemistry**

The reaction A -> B + C is 1st order w/ respet to A. It's rate const k is equal to 0.343 M/s at 273K. The initial concentration of A was 0.399 M. Calculate the concentration of B after 0.185 secs have passed.
*February 18, 2012 by bernard*

**statistics**

10. You have proposed a hypothesis that right-handed (RH) subjects will be superior in spatial analysis compared to left-handed (LH) subjects. Spatial analysis skills are being assessed on a scale which yields scores on a linear numerical scale. Given the following information...
*December 6, 2011 by Linda*

**math**

there are 10 marbles in a bag: 1 blue, 4 yellow, 3 red, and 2 white. if you choose a marble at random, what is the probability that you will NOT choose white?
*July 16, 2012 by jake*

**chemistry FP depression**

if I had to choose a solvent for a freezing point depression lab...would I choose Chloroform or Benzophenone? and why?
*April 23, 2013 by JENNA*

**physics**

A 10-kg block slides down a smooth inclined surface. Determine the terminal velocity of the block if the 0.1-mm gap between the block and the surface contains SAE 30 oil at 60 F. Assume the velocity distribution in the gap is linear, and the area of the block in contact with ...
*September 4, 2011 by pramoda*

**Geometry**

a four sided garden plot has an irregular shape. the second side is 12 feet longer than the first. the third side is 24 feet longer than the second. the fourth side is 36 feet longer than the third. if the perimeter of the plot measures 136 feet, what is the length of the ...
*June 11, 2014 by Jerry*

**math**

1. Solve for the indicated letter D=4e, for e The solution is e= 2. G(x) = 6/(6-5x) Choose the correct domain below {x|x is a real number and x ≠0} {x|x is a real number and x≠6/5} {x|x is a real number and x≥6/5} {x|x is a real number and x ≠6} 3. ...
*September 8, 2009 by Letty*

**chemistry**

when aluminum metal reacts with iron (III) oxide to form aluminum oxide and iron metal, 429.6 kJ of heat are given off for each mole of aluminum metal consumed, under constant pressure and standard conditions. What is the correct value for the standard enthalpy of reaction in ...
*December 2, 2008 by sylvia*

**Chemistry **

Consider the reaction: 2 H2S(g)--><-- 2H2(g) + S2 Kp= 2.4 x 10^-4 at 1073k A reaction mixture contains .112 atm of H2,.055 atm of S2, and .445 atm of H2S. Is the reaction mixture at equlibrium? If not, in what direction will the reaction proceed?
*February 23, 2011 by sally*

**Chemistry **

Consider the reaction: 2 H2S(g)--><-- 2H2(g) + S2 Kp= 2.4 x 10^-4 at 1073k A reaction mixture contains .112 atm of H2,.055 atm of S2, and .445 atm of H2S. Is the reaction mixture at equlibrium? If not, in what direction will the reaction proceed?
*February 23, 2011 by sally*

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