Friday

March 27, 2015

March 27, 2015

Number of results: 49,167

**Chemistry**

The reaction: 2 HI==> H2 + I2, is second order and the rate constant at 800 K is 9.70 x 10-2 M-1 s-1. How long will it take for 8.00 x 10-2 mol/L of HI to decrease to one-fourth of its initial concentration? can someone please show me how to set this up?
*March 3, 2010 by Bababab*

**Chemistry 12**

given the reacting system: H2 (G) + I2(G) ---> 2HI(g) Keq= 64 Equal moles of H2, I2, and HI are placed in a 1.0 L container. Use calculations to determine the direction the reaction will proceed in order to reach equilibirum
*December 6, 2012 by Patrick*

**Chemistry 12**

given the reacting system: H2 (G) + I2(G) ---> 2HI(g) Keq= 64 Equal moles of H2, I2, and HI are placed in a 1.0 L container. Use calculations to determine the direction the reaction will proceed in order to reach equilibirum
*December 6, 2012 by Patrick*

**PLEASE HELP CHEM!**

2 HgCl2 (aq) + SnCl2 (aq) --> SnCl4 (aq) + Hg2Cl2 (s) Hg2Cl2 (aq) + SnCl2 (aq) --> 2Hg (s) + SnCl4 (aq) For each reaction, write the two half-reactions that make it up and calculate the overall reaction potential by adding the two half-reactions. Each overall potential ...
*April 8, 2012 by Betsy *

**Chemistry**

Atom-Particle that cannont be divided in half becasue it is in its smallest form. Reactants-Substances that exist before the reaction begins. Endothermic Reaction-take in, or absorb heat energy. Exothermic Reaction- Release Heat energy Inhibitor-makes a reaction slower. Rate ...
*October 8, 2007 by Tom*

**Math**

Jared drew a scatter plot comparing the number of hours worked and the amount of money earned over the course of a week. He graphed the ordered pairs(number of hours, amount paid)for each day worked. Which of the three scatter plots below most likely represents the data? What ...
*May 6, 2014 by Gwen*

**largest possible area**

Again from applications of derivatives.. what is the largest possible area for a right triangle whose hypotneus is 5cm long, and what are its dimensions. Thanks a^2 + b^2 = c^2 3^2 + 4^2 = 5^2 Area of a triangle 1/2 base times altitude hint: base is 3 altitude is 4 The formula...
*November 18, 2006 by Jen*

**Intermediate Algebra**

A gardner wants to create a rectangular garden with length of 8x-4y ft. and and width of 5x+9y ft. What is the area of the garden? Be sure to multiply this out, express in simplest correct mathematical form and include units.
*June 6, 2012 by ladybug*

**science**

2Al+3H2SO4--> Al2(SO4)3+3H2 a.)determine the oxidation number of each element in both the reaction and products of this oxidation-reduction reaction of aluminum and sulfuric acid. b.) what element is oxidized in this reaction? c.) what element reduces in the reaction?
*May 3, 2011 by michael *

**science experiment**

See the question from earlier regarding how many variables are in the experiment. I think speed of stirring is a variable. So, my answer would be 3 variables. One for water temp., speed of stirring, and the calcium carbonate solubility. Is this right? I don't think speed of ...
*February 13, 2007 by Hailey*

**MAth**

Ok so basically we have to choose a topic of interest and then survey it... one that you can obtain numerical data from that has the potential to have responses with a significant amount of variation. and then create a question to ask/investigate. Be sure this question is a ...
*October 7, 2013 by Lululu*

**English**

Hello. Please help me to choose the correct (or a better word): The president "offered, proposed, suggested" his program. The verbs look like synonyms. Are all of them possible in this context? Thank you for your help.
*February 3, 2011 by Ilma*

**Grammar (Writeacher)(or Ms. Sue)**

For each of the following sentences, choose the correct verb in parentheses, and write it on your paper. 1. Marines and paratroopers from the United States (was, were) landing in France on D-Day in 1994.
*May 15, 2013 by Anonymous*

**english**

Choose the answer that displays the correct spelling of the plural form of the words in parentheses. Ancient (Roman) used (goose) as (guard) to warn of (enemy) approaching the camp.
*July 5, 2013 by alex*

**Chemistry**

Choose from the list the correct electron configurations for the following ions. A B C D E F G H I J K+ A B C D E F G H I J In+ A B C D E F G H I J Li+ A B C D E F G H I J Na+ A. 1s22s22p63s23p6 B. 1s22s22p63s23p64s23d104p64d105s25p1 C. 1s22s22p63s23p63d104s2 D. ...
*October 20, 2013 by sara*

**programming**

create the logic for a program that calculates and displays the amount of money you would have if you invested $5000 at 2 percent simple interest for one year. create a separate method to do the calculation and return the result to be displayed.
*October 28, 2014 by Brian*

**Math... Stuck... A little help?**

x cube plus kx plus 9=0 I took it as: x^3+kx+9=0 I answered: If so......... x^3+kx+9=0 Subtract 9 from both sides (Somenoe correct me if I'm wrong, please) which looks like: x^3+kx+9-9=0-9 Now the best part.... finding variables x^3+kx=9 x^3+(k•x)=9 Hmmm... x^3= (x•x•x) x•x•x•...
*November 25, 2014 by Anonymous :D*

**chemistry**

"Ag(s) reacts with none of the 4 (solutions of Ag^+2, Pb^+2, Cu^+2, Zn^+2}. So Ag(s) goes at the bottom of the table for now although there may be some metals below silver when you finish with the entire table. Cu(s) reacts with (Ag^+ solution) so Cu goes above Ag ion. It is ...
*April 14, 2008 by Joseph*

**math**

18. Exponential growth follows the formula y= a(1+r)^x and exponential decay follows the formula y= a (1-r)^x. False? 23. In controlled experiments, the researcher is able to find a casual relationship between the variables- True 27. The explanatory and response variables in ...
*June 19, 2013 by mysterychicken*

**Calculus**

Consider the infinite series of the form: (+/-)3(+/-)1(+/-)(1/3)(+/-)(1/9)(+/-)(1/27)(+/-)...(+/-)(1/3^n)(+/-)... (A) Find x and y from: x(</=)(+/-)3(+/-)1(+/-)(1/3)(+/-)...(</=)y. (B) Can you choose the signs to make the series diverge? (C) Can you choose the signs to ...
*April 21, 2010 by Megan*

**calculus**

Consider the infinite series of the form: (+/-)3(+/-)1(+/-)(1/3)(+/-)(1/9)(+/-)(1/27)(+/-)...(+/-)(1/3^n)(+/-)... (A) Find x and y from: x(</=)(+/-)3(+/-)1(+/-)(1/3)(+/-)...(</=)y. (B) Can you choose the signs to make the series diverge? (C) Can you choose the signs to ...
*April 22, 2010 by Megan*

**calculus**

Consider the infinite series of the form: (+/-)3(+/-)1(+/-)(1/3)(+/-)(1/9)(+/-)(1/27)(+/-)...(+/-)(1/3^n)(+/-)... (A) Find x and y from: x(</=)(+/-)3(+/-)1(+/-)(1/3)(+/-)...(</=)y. (B) Can you choose the signs to make the series diverge? (C) Can you choose the signs to ...
*April 22, 2010 by Megan*

**caculator**

how do you do "choose" on ti-83 calculators? like 5 choose 4
*January 31, 2008 by chris*

**Economics**

I picked C as the answer to this question but I am not sure? The difference between production possibilities frontiers that are vowed out and those that are linear is that: A)bowed out production possibilities frontiers illustrate tradeoffs, whereas linear production ...
*May 6, 2008 by G*

**w.g**

ship breakers wreck old ships in order to: A)create a light industry B)provide work gor unemployed city residents C)**assist cottage industries D)recycle iron and steel i think thats it but i really think is for them to know whose ship is whose but thats not any of the chooses
*September 24, 2009 by henry*

**stats **

I am having a bit of trouble with the top half of the questions. I have an answer below for questions 5-10, is there anyway you can check those answers and help me with the rest I am having trouble with. Thank you. 1. The area to the right of 1.93 under Student's t-curve with ...
*July 22, 2013 by sandra*

**chemistry**

The formation of nitroanalyine (an important intermediate in dyes, called ‘fast orange’) is formed from the reaction of ortho-nitrochlorobenzene (ONCB) and aqueous ammonia. (See Table 3-1 and Example 9-2.) The liquid-phase reaction is first-order in both ONCB and ammonia with ...
*February 24, 2011 by john *

**chemistry**

iron+sulphur together are a mixture of small grains yellow and dark grey.Its chemical symbol is 'Fe + S'.When it reacts with oxygen they create a new chemical substance; Iron Sulphide. What do you put for 'explain the reaction using the Big Idea of Energy? :S HELP xxx
*April 10, 2011 by jess*

**Math**

Determine the linear velocity of an object with an angular velocity of 8.1 radians per second at a distance of 10 centimeters from the center. Use pi. Round the answer to the nearest tenth. I got 47, is this correct?
*November 24, 2014 by Anonymous*

**english**

Which of the following is the best opening sentence for a business letter that you want to sound fairly informal? A. I am in receipt of your order of February 10. B. This letter is to make you cognizant of our receipt of your order. C. Your order of February 10 arrived in our ...
*February 28, 2009 by dj*

**O.Chemistry *****PLEASE CHECK*****!!!!**

Please check these out for me, if I am correct: Match the following statements with SN1 or SN2 reactions: 1) The order of reactivity in alkyl halides is methyl>primary>secondary>tertiary 2) There is an intermediate carbocation 3) The rate-limiting step involves the ...
*March 14, 2008 by K*

**keybording and word processing**

4. If you find a web site that you wish to visit frequently, you should?? a. assign it a web address, b. create a book mark, c. create a hyperlink., d. set up a special folder for it
*June 9, 2008 by Raksha*

**Computer science**

THIS IS C PROGRAMMING I NEED TO CREATE A METHOD! Create a method areaOfaTrapeziod when given a, b, and h (all doubles), will return the area (double) of a trapezoid. Use the equation pictured below. THANKS IN ADVANCE :)
*November 2, 2011 by Nan*

**Civics**

Why did the framers of the constitution include the system of checks and balances? To ensure the powers of each branch of government are limited and checked by another branch To create a process for the American people to choose their representatives for government branches To...
*January 6, 2015 by jeje*

**algebra**

Identify the vertices of the solution region of the system of linear inequalities. (Order your answers from smallest to largest x, then from smallest to largest y.) x ≥ −2 x ≤ 3 y ≤ 5 y ≥ x (x, y) = (x, y) = (x, y) = (x, y) = Tried several times, ...
*December 4, 2014 by Abby*

**managerial economicsQ3**

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 cost of $4 (fixed costs are zero). (a)Write down the profit equations for firms A and B. (b)Write down the...
*September 7, 2008 by jenny*

**chemistry**

a certain a digestive reaction, performed at optimum temperature and pH takes 10 minutes to reach completion when performed in the absence of the associated catalyst. How many minutes would the same reaction require if an enzyme that increase the reaction rate one million ...
*April 5, 2013 by meghan*

**Chemistry 30**

Consider the following reaction at equilibrium: 4NH3(g) + 5O2(g) ↔ 4NO(g) + 6H2O(g) In what direction will the following changes force the reaction? a) Addition of O2 b) Reduction of the amount of water vapour c) Increase in the pressure d) Decrease in the volume e) If ...
*September 30, 2014 by Ade*

**Chemistry**

Time, (min): 0 10 20 30 Moles,(trans): 1.00 0.90 0.81 0.73 Given the following data, what is the order of the reaction? How long will it take for the half of the trans compound to decompose?
*March 24, 2010 by Jamie*

**Science**

N2O5 gives 2NO2 plus 0.5 O2. Rate for first order reaction. K = 5 * 10/10000 R = 0.30 mol/liter after 40 min. What is the [C] of N2O5 and NO2 ?
*December 28, 2012 by JAY*

**chemistry**

Consider a light-sensitive reaction. What energy, in joules per photon, is needed to drive the reaction if delta H of the reaction is equal to 307kJ/mol?
*October 18, 2008 by kelsie*

**biochemistry**

You have a 100 mMoles of A in the 10 ml reaction mixture which contains buffer and enzyme. The reaction is allowed to reach equilibrium at 25 o C and you measure the concentration of B as 10 mM. What is the delta Go' for the reaction in KJ.
*July 25, 2012 by Sarah*

**chemistry**

Welders often use acetylene torches heat up the metal. The reaction is: C2H2(g) + 2.5O2(g) = 2CO2(g) + H2O(g) Calculate the ΔH of reaction for this reaction.
*January 31, 2015 by danny 16*

**math, algebra**

Problem: A formula for a football player's rushing average r with a total of y yards rushed in n carries of the ball is r=y/n. Solve for n. I have no other information this is how its in the book how do i even solve for n if theres no numbers. You don't use numbers. It asks to...
*December 12, 2006 by jasmine20*

**college statistics**

I am having a bit of trouble with the top half of the questions. I have an answer below for questions 5-10, is there anyway you can check those answers and help me with the rest I am having trouble with. Thank you. 1. The area to the right of 1.93 under Student's t-curve with ...
*July 18, 2013 by penelope*

**WRITING SKILLS **

Which of the following is the best opening sentence for a business letter that you want to sound fairly informal? A. I am in receipt of your order of February 10. B. This letter is to make you cognizant of our receipt of your order. C. Your order of February 10 arrived in our...
*February 13, 2010 by alia*

**writing skills**

14. Which of the following is the best opening sentence for a business letter that you want to sound fairly informal? A. Your order of February 10 arrived in our office today. [B. This letter is to make you cognizant of our receipt of your order.] C. I am in receipt of your ...
*July 2, 2012 by jake*

**Grammar-Ms. Sue(:**

12. Which of the following is the best opening sentence for a business letter that you want to sound fairly informal? A. Please be advised that I've just received your order. B. Your order of February 10 arrived in our office today. C. I am in receipt of your order of February...
*May 9, 2013 by Anonymous*

**Grammar-Ms. Sue(:**

12. Which of the following is the best opening sentence for a business letter that you want to sound fairly informal? A. Please be advised that I've just received your order. B. Your order of February 10 arrived in our office today. C. I am in receipt of your order of February...
*May 10, 2013 by Anonymous*

**The Odyssey and Orestia**

Hi. I need some help with a few questions regarding The Odyssey and Orestia. (I have eliminated some of the possible choices because I know they are incorrect) 1.How are the endings of both the Odyssey and the Orestia similar? A.In both cases, the goddess Athene steps in to ...
*November 22, 2014 by Dennis*

**Chem Check Please!!!**

1) As bound ligands, which of the following causes the largest splitting of d-orbitals? a. phen b. H2O c. I– d. CN– e. C2O4^2– Answer D 2) The spectrochemical series a. lists ligands in order from monodentate to hexadentate. b. lists ligands in the order of their ...
*May 6, 2014 by Anonymous*

**thank u writeacher**

correct sentence: arent these all questions: A)whom needs a ride to the concert? b}for who this letter is? C)whom are we following? D)to who does that dog belong? i choose a.
*July 17, 2009 by henry*

**maths**

Choose the option that gives (correct to two decimal places) the area of the region which is bounded by the x-axis and by the graph of y =(20(7 − x)(x − 3))/x^2 . Options A 0.47 B 1.31 C 2.09 D 3.76 E 5.12 F 6.55 G 8.20 H 9.46
*May 11, 2011 by albert*

**English**

11. Choose the plural noun that's spelled correctly. A. Fathers-in-law B. Editor in chiefs C. Phenomenons D. Pianoes I selected (A) for the answer, is this the correct answer?
*December 19, 2011 by Sis*

**math help**

An engineer is required to survey a nonrectangluar plot of land but is unable to measure side UT directly. The followng data are taken; RU=130 meters, RS=12m ST=90m, angle RST=115, and angle RUT=100. Calculate the length of side UT and the area of the plot. The picture is a ...
*January 12, 2008 by julie*

**math**

A rectangular plot is bounded at the back by a river. No fencing is needed along the river and there is to be an opening in front of about 24 meters. If the cost of fencing in front is $1500 per meter and the cost of fencing the sides is $1000 per meter, find the dimensions of...
*April 25, 2013 by natasha*

**Math**

Gray bought two plots of land for a total of 120000 on the first plot she made a profit of 15% on the second plot she made 10% profit her total profit 5500, how much did she pay for each piece of land? (And please show the full procedure of the math even the rough work as well...
*October 18, 2013 by URGENT Help Need by 22.10.13*

**Chemistry**

Delta H is 20.1 kJ/mol and Delta S is 45.9 J/(mol-k). Assuming these values change very little with temperature, over what temperature range is the reaction spontaneous in the forward direction? Is the reaction spontaneous for temperatures less than or greater than the solved ...
*March 9, 2012 by Katherine*

**Biology**

Arrange the following in correct order in food chain- Fish,Plankton,Shark,Crab
*March 3, 2012 by Zoopy*

**Algebra**

There are 15 people to choose from for a nine-person batting order in a baseball team. In how many ways can the people be arranged in the lineup? Is it 1,816,214,400? 2. A basketball team consists of 12 people. How many lineups of 5 people can be selected? Is it 792?
*May 13, 2014 by Anonymous*

**Physics**

With your equations, I solved for the two unknown variables and got the correct answers for the forces. Thanks! Unfortunately, I don't really understand how you came up with those two equations in the first place. I set up a diagram and selected a pivot point force the forces...
*March 10, 2008 by Jessica*

**Math**

1) An aerobics class is being offered at the ABC body gym. Nonmembers pay $4 per class while member pay a monthly fee of $10 plus $2 per class. a. Create a linear system to represent the two options. b. At how many classes will the cost be the same? What is that cost? c. When ...
*October 13, 2014 by Kevin*

**chemistry (please check/help)**

How would you make a serial dilution if you have a starting value 100mM of X The are the values of X show different dilutions. Volume variables (x) mL 0 1 3 1 10 30 100 We starting out with 100mM of X which would be considered its concentration. In order to describe how to do ...
*January 28, 2007 by tatiana*

**Chemistry**

In solution, hypochlorite ion is known to decompose with a second-order rate law. If [ClO-]0 = 0.0570 M and k = 2.06x10-4 M-1·min-1, calculate the half-life for this reaction 2ClO- 2Cl- + O2.
*September 6, 2012 by Amber*

**Psychology**

From Negative Reinforcement University...You're stuck in a dungeon. In each room water is filling to the top but you can choose a button a Triangle or a Circle and if you choose correct a door will open and you can continue to another room (there is a total of 5 rooms) if at ...
*November 1, 2010 by Anonymous*

**Math**

A state lottery requires you to choose 4 cards from an ordinary deck: I heart, 1 club, 1 diamond, and 1 spade in that order from the 13 cards in each suit. If all four choices are selected by the lottery, yo win $5,000. It costs $1 to play. Find the expected payback.
*April 2, 2013 by Devin*

**Math**

If you have 3 graphs plotted on the same page and can't tell just by looking at them which one is linear (they all have a slight curve and some linear features), how do you use the y-intercepts to determine this?
*February 24, 2011 by Sara*

**Calc....**

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.) ln(1 + x) ¡Ö x
*March 13, 2012 by fatih*

**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.) (1+2x)^(1/4)¡Ö 1 +(1/2)x
*March 13, 2012 by Jessica*

**math**

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.)
*October 20, 2013 by brian*

**Math**

Can in a Cone Find the volume of the largest can that can fit entirely under a cone with volume 900 cubic cm. 1.draw pictures of at least THREE different cases (including the endpoints if any). 2. define all variables CLEARLY (with words) and then use those variables ...
*March 11, 2013 by jonh*

**Math**

Can in a Cone Find the volume of the largest can that can fit entirely under a cone with volume 900 cubic cm. 1.draw pictures of at least THREE different cases (including the endpoints if any). 2. define all variables CLEARLY (with words) and then use those variables ...
*March 14, 2013 by jonh*

**linear programming**

Exeter Mines produces iron ore at four different mines; however, the ores extracted at each mine are different in their iron content. Mine 1 produces magnetite ore, which has a 70% iron content; mine 2 produces limonite ore, which has a 60% iron content; mine 3 produces pyrite...
*May 20, 2012 by alia*

**pre-algebra**

Explain the basic method(steps) for graphing a linear equation. Can you give an example of a linear equation and show me how to graph the equation?
*November 19, 2011 by Sherrie*

**chemistry**

I need to find out which structure is more correct: Reaction of the compound C3H8O with CrO3 (oxidizing agent) yields acetone. Which of the three structures is more correct? (My three structures are as follows: 1-propanol, 2-propanol, and methylethyl ether.)
*January 18, 2011 by ella*

**Statistics**

You want to compare the quality of several statistics textbooks. (a) Identify two categorical variables and two quantitative variables that you would use to describe textbook quality. Give a reason for each of your choices. So I think for the first categorical variable the ...
*September 9, 2009 by Samantha*

**Chemistry**

For the reaction, 2 XO + O2 = 2 X02, some data obtained from measurement of the initial rate of reaction at varying concentrations are given below. run # [XO] [O2] rate, mol L-ls-l 1 0.010 0.010 2.5 2 0.010 0.020 5.0 3 0.030 0.020 45.0 The rate law is therefore a. rate = k[XO]...
*February 20, 2012 by Hannah*

**calculus**

se differential, i.e., linear approximation, to approximate (8.4)^(1/3) as follows: Let f(x)=(x )^(1/3). The linear approximation to f(x) at x=8 can be written in the form y=mx+b where m is: and where b is: Using this, we find our approximation for (8.4)^(1/3) is
*August 28, 2010 by jin*

**linear approximation**

a) Find the linear approximation of the function f(x)=4cos(3x^2) near x = 0 b) Use the approximation found in part (a) to estimate the value of f(pi/20)
*December 7, 2014 by Peter*

**maths**

Compass bearings of a carin are taken from two points A and B, 400 m apart, along a strsight north-south path, A being due north of B. the bearings of the carin from A and B are 110 degrees and 80 degrees, respectively. choose the two options which give the distances from A ...
*April 19, 2007 by kelly*

**chem**

which one of the following statements about sulfuric acid is correct? A. sulfuric acid is a known muriatic acid B. sulfuric acid is a strong oxidizing agent C. sulfuric acid has little effect on metals D. sulfuric acid is dangerous to living organisms B and D are both correct...
*August 5, 2005 by alf*

**Chemistry**

What kind of reaction is this (redox, precipitation, acid-base, or complex ion formation reaction)? 1. 3 Ca(s) + 2 Al^3+(aq) -> 3 Ca^2+(aq) + 2 Al(s) 2. LiHCO3(s) + heat -> Li2CO3(s) + CO2(g) + H2O(g) Complete the reaction: Ni(s) + 2 Na^+(aq) -> ?
*October 21, 2013 by Fred*

**English**

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 this poem. 4. What message was Hate trying to ...
*February 22, 2013 by Anonymous*

**chemistry**

Aspirin, C 9 H 8 O 4 , slowly decomposes at room temperature by reacting with water in the atmosphere to produce acetic acid, HC 2 H 3 O 2 , and 2-hydro x ybenzoic acid, C 7 H 6 O 3 (this is why old bottles of aspirinoften smell like vinegar):C 9 H 8 O 4 + H 2 O p HC 2 H 3 O ...
*April 9, 2013 by vikha*

**physics **

Monochromatic light of wavelength 550 nm passes through a diffraction grating that has 55000 lines/m. A bright line appears on the screen at an angle of 12.23o from the central bright fringe. What is the order of this bright line? Choose one answer. a. 5 b. 6 c. 7 d. 8
*April 30, 2011 by ashley --*

**Math**

Can someone please double check my answers (My answers are in Capital) 1. If you produce a million products a day and you want to test ten of them to determine if they are up to standard, which ones will you choose? a. The second ten B. TEN RANDOM UNITS c. The last ten d. The ...
*June 18, 2013 by mysterychicken*

**ap chemistry :(**

consider the reaction C6H14 + 9.5O2 yields 6CO2 + 7H2O at constant pressure. which response is true? 1. work may be done on or by the system as the reaction occurs, depending upon the temperature. 2. work is done on the system as the reaction occurs. 3. no work is done as the ...
*October 18, 2012 by sam*

**chemistry**

The standard free energy of activation of a reaction A is 78.2 kJ mol–1 (18.7 kcal mol–1) at 298 K. Reaction B is ten million times faster than reaction A at the same temperature. The products of each reaction are 10.0 kJ mol–1 (2.39 kcal mol–1) more stable than the reactants.
*December 6, 2012 by Deidra *

**Chemistry 2**

For the fist order reaction A <-> B, calculate the t1/2(half life) and k(rate constant) and also fill in the blanks. A-Concetration t-time 20 0 10 ? 5 40 sec 3 ? ? 500 sec t1/2=? k=?
*March 3, 2014 by Ivan *

**Chemistry 2**

For the fist order reaction A <-> B, calculate the t1/2(half life) and k(rate constant) and also fill in the blanks. A-Concetration t-time 20 0 10 ? 5 40 sec 3 ? ? 500 sec t1/2=? k=?
*March 3, 2014 by Ivan *

**chemistry**

The decomposition reaction, x-->products, is second-order with rate constant k=0.0183 L/(s)(mol). How long will it take for the decomposition to be 95% complete, if the intitial concentration of X is 1.25mol/L? Thanks
*June 18, 2014 by Jin*

**Chemistry**

For the following reaction, the equilibrium constant Kc = 97.0 at 900K. If the initial concentrations of NH3 and H2S are both 0.20 M, what is the equilibrium concentration of H2S? H2S(g) + NH3(g) = NH4HS(s) Would you have to create an ICE chart for this type of problem?
*March 17, 2012 by David*

**Science**

What were Mendeleev's reversals?How did Henry Moseley explain them? Mendeleev thought the periodic table was in order of atomic mass. Mosley determined that atomic number was the correct order. http://www.chemistry.co.nz/henry_moseley.htm
*October 16, 2006 by Raquel*

**Biology**

Okay so if i have two enzyme catalyzed reactions: 1) delta g of the ES = -22kJ/mol 2) delta g od the ES = 42 kJ/mol Is this first reaction going to have a higher reaction rate because the of the negative delta g, because doesnt a negative delta g give you a spontaneous ...
*January 26, 2013 by Cindy*

**statistics**

suppose a company receives 60% of its order the internet. what is the probability that the fifth order received is the first internet order? what is the probability that the eight order received is the fifth internet order?
*December 17, 2011 by Anonymous*

**Biology help**

can anybody please tell me if the diagram to show anaphase 1 is a cell with the 4 genes at the top and 4 genes at the bottom, im struggling with this as there are many diagrams to choose but is this one correct mant thanks
*April 12, 2007 by bex*

**Physics**

The materials with the lowest resistance are called a) conductors b)superconductors c)semiconductors d) insulators I can't decide between a) or b) but if I had to choose one would the correct one be b)?
*April 5, 2008 by Andrea*

**chemistry (work shown)**

How would you make a serial dilution if you have a starting value 100mM of X The are the values of X show different dilutions. Volume variables (x) mL 0 1 3 1 10 30 100 We starting out with 100mM of X which would be considered its concentration. In order to describe how to do ...
*January 28, 2007 by tatiana*

**Algebra 1**

1)A farmer plans to create a rectangular garden that he will enclose with chicken wire. The garden can be no more than 30 ft wide. The farmer would like to use at most 180 ft. of chicken wire. Write a system of linear inequalities that models this situation. 2) Determine the ...
*January 2, 2013 by Hally*

**chemistry correction**

1. Which two elements react vigorously with each other? A: Chlorine and lithium B:Chlorine and potassium C:iodine and lithium D:iodine and potassium my answer is B 2. which statement about electronegativty is correct. A: Electronegativity decrease across a period. B:...
*March 11, 2010 by Richard*

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