# Questions Asked onFebruary 27, 2012

1. ## Chemistry

Find the pH of each mixture of acids. 0.115 M HBr and O.125 M HCHO2. I TRIED DOING THIS PROBLEM THE SAME WAY AS THE ONE BEFORE BUT IT DIDN'T WORK. THE PH SHOULD BE 0.939. I did HBr as stronger acid and got concentration of H+ and put it into the ka

2. ## English

i read this story today and need help with few questions. sorry it a bit long. i actually not real understand it, especially ending. THE WHITE KNIGHT by Eric Nicol Once upon a time there was a knight who lived in a little castle on the edge of the forest

3. ## Physics!!!

A 24-V battery is connected in series with a resistor and an inductor, with R = 5.6 Ω and L = 2.0 H, respectively. (a) Find the energy stored in the inductor when the current reaches its maximum value. (b) Find the energy stored in the inductor one time

4. ## Chemistry

Determine whether each cation is acidic or pH neutral. For those cations that are acidic, write an equation that shows how the cation acts as an acid. A) Sr+2 B) Mn+3 C) C5H5NH+ D) Li+

5. ## Geometry

4. Plots of land between two roads are laid out according to the boundaries shown. The boundaries between the two roads are parallel. What is the length of Plot 3 along Cheshire Road? 46 yards 67 yards 66 yards 37 yards

6. ## Chemistry

Find the pH of each mixture of acids. 0.020 M HBr and 0.015 M HClO4. They are both strong acids Si they dissociate completely. Si do I just add 0.020 and 0.015 and take the -log of that concentration to get the pH? Like thus.... 0.020+0.015=0.035

7. ## Geometry

To the nearest degree, what angle does a hill with a grade of 11% make with a horizontal line?

A trough is 5 meters long, 1 meters wide, and 4 meters deep. The vertical cross-section of the trough parallel to an end is shaped like an isoceles triangle (with height 4 meters, and base, on top, of length 1 meters). The trough is full of water (density

9. ## Physics

A 0.1-kg object is traveling to the right (in the positive direction) with a speed of 2 m/s. After a 0.2 s collision, the object is traveling to the left at 3 m/s. What is the magnitude of the impulse (in N-s) acting on the object? The answer must be

10. ## physics

A 60 kg woman and an 85 kg man stand 9.0 m apart on frictionless ice. (a) How far from the woman is their CM? (b) If each holds one end of a rope, and the man pulls on the rope so that he moves 1.1 m, how far from the woman will he be now? (c) How far will

11. ## physics

a car is traveling 20.0 m/s when the driver sees a child standing in the road. he takes 0.80 seconds to react, then steps on the brakes and slows at -7.0 m/s squared. how far does the car go before it stops?

43. ## Inferential Statictics

Welsh, Davis, Burke, and Williams (2002) conducted a study to evaluate the effectiveness of a carbohydrate-electrolyte drink on sports performance and endurance. Experienced athletes were given either a carbohydrate-electrolyte drink or a placebo while

44. ## math

2. suppose a point at (2,3) is translated to (7,-1). which rule describes this translation? a) translate right 5, down 4 b) translate left 5, up 4 c) translate right 9, down 2 d) translate left 9, up 2 3. if the point (-5, -8) is reflected over the y-axis,

45. ## physics

How much work is required to lift a 280 kg refrigerator to the second-story level that is 6m high?

46. ## mental health

list three sources of feedback that can influence a person's feelings of self-worth.

47. ## Physics

How many seconds will elapse between seeing lightning and hearing the thunder if the lightning strikes 2 mi away and the temperature is 100 degree F?

48. ## chemistry

Al2O3(s)+6NO(g)---->5N2(g)+6H2O(l) how many grams of Nitric Oxide are required to produce 145g of nitrogen in the following reaction?

49. ## Chemistry

Calculate the OH - concentration present in water under the following conditions. Enter your answer in scientific notation. A)[H3O+] = 9.4 x 10-10 M B)[H3O+] = 5.5 x 10-3 M C)[H3O+] = 6.2 x 10-12 M

50. ## Physics help

A light rope is wrapped several times around a large wheel with a radius of 0.435 m. The wheel? A light rope is wrapped several times around a large wheel with a radius of 0.435 m. The wheel rotates in frictionless bearings about a stationary horizontal

51. ## Calculus and Vectors

A bald eagle flying horizontally at 48km/h drops it's prey from a height of 50m. a)what is the prey's vertical velocity when it hits the ground? b)when is the vertical speed greater than the horizontal speed?

52. ## college algebra

A steel drum in the shape of a right circular cylinder is required to have a volume of 100 cubic feet. express the amount of material required to make the drum as a function of the radius r of the cylinder. also how much material is required if the drum is

86. ## Physics

A ball is dropped from 27.0 ft above the ground. (a) Using energy considerations only, what is the velocity of the ball just prior to it hitting the ground? (b) If the ball is thrown back up to a ledge 15 m above the ground, what would be the velocity just

87. ## physics

A 220-g ball strikes a wall with a speed of 7.0 m/s and rebounds with only 37% of its kinetic energy. What is the speed of the ball immediately after rebounding? What is the magnitude of the impulse of the ball on the wall? If the ball was in contact with

88. ## science

Numbers 1-9 are true and false questions.Check if my answers are right and if I didn't write anything on the blank, I need help with them. Thanks!!!! _____ 1. Velocity could be reported as 50 k/hr. True 2. How far an object travels in a certain period of

89. ## Physics

A 279 N force is pulling an 75.9-kg refrigerator across a horizontal surface. The force acts at an angle of 26.3 ° above the surface. The coefficient of kinetic friction is 0.259, and the refrigerator moves a distance of 9.14 m. Find (a) the work done by

90. ## physics

A uniform rigid pole of length L and mass M is to be supported from a vertical wall in a horizontal position, as shown in the figure. The pole is not attached directly to the wall, so the coefficient of static friction, μs, between the wall and the pole

94. ## physics

A uniform ladder 10.0 m long is leaning against a frictionless wall at an angle of 60.0° above the horizontal. The weight of the ladder is 18.4 lb. A 60.8-lb boy climbs 4.18 m up the ladder. What is the magnitude of the frictional force exerted on the

95. ## geometry

Miguel is driving his motorboat across a river. The speed of the boat in still water is 10 mi/h. The river flows directly south at 3 mi/h. If Miguel heads directly west, what are the boat’s resultant speed and direction? Round answers to the nearest

96. ## Science

A student observed two different types of cells under a microscope. She noticed that one cell had many more mitochondria than the other. What can the student predict about the cell with more mitochondria? A. The cell produces more waste. B. The cell makes

97. ## math

Triangle RST is similar to triangle XYZ. If the measure of angle S is 41°, and the measure of angle R is 76°, what is the measure of angle Z? please help

100. ## Math ( please helllp )

The sides of a triangle have lengths ; 2x-1,x+3,3x-4 . Which of the following describes the perimeter of the triangle in terms if "x"

101. ## math

kim ate 3/2 slices of an apple. Did he eat less than a whole apple or more than the whole apple. draw picture to show your answer

102. ## math

lisette drew a rectangle and divided it into fourths. She colored the whole rectangle. How many fourths were colored?

103. ## Math

the ages of two brothers are 11 and 8 years. In how many years time will the product of their ages be 208?

125. ## chemistry

For a one step reaction, the activation energy for the forward reaction is 40.0 kJ/mol and the enthalpy of reaction is -20.0 kJ /mol. Which statement below is true? a. The activation energy of the forward reaction would be affected to a greater extent than

126. ## Math

You play a game where you win $1.00 for each dot that turns up on a fair die (has 6 sides). You pay$3.50 to play the game (and the money is not returned). Find the expected (average) winnings for this game.

148. ## english

sorry for posting it again i just need some help with proof read original thread display.cgi?id=1330379031 1. Water is the source of life. We all depend on it. Water is important, and we cannot survive a week without it. 2. Water should be free; it is a

149. ## chemistry

A container is charged with hydrogen, nitrogen, and ammonia gases at 120°C and the system was allowed to reach equilibrium. What will happen if the volume of the container is increased at constant temperature? 3H2(g) + N2(g) 2 NH3(g)

150. ## help!!!!!!!!

in the days of king adobe, what is a charactertrait describing the two travelers.give two examples to support your description. I picked sneaky. I only know one supporting detail.I need help finding the other supporting detail.

151. ## physics

a 9000 kg railroad car moving at 3 m/s strikes a stationary 5000 kg railroad car .what is the momentum of the 9000 kg railroad car before the collision?

152. ## physics

A passenger in a helicopter traveling upwards at 23 m/s accidentally drops a package out the window. If it takes 16 seconds to reach the ground, how high to the nearest meter was the helicopter when the package was dropped?

153. ## ACC291

The following stockholders' equity accounts arranged alphabetically are in the ledger of McGrath Corporation at December 31, 2011. Common Stock ($10 stated value)$1,500,000 Paid-in Capital from Treasury Stock 6,000 Paid-in Capital in Excess of Stated

154. ## Math. Proportions

Can u check these. ? What percent of 230 is 23? I got : 28.75% is this. Right? 80% of what number is 15? I got : 18.75% is that right? Word problem A school holds classes from 8a to 2p For what percent of a 24hr day does this School hold class? I got 25%

Mixture Problem... An auto tech needs a radiator to have a 40% antifreeze solution. The radiator currently is filled with 4 gallons of a 25% antifreeze solution. How much of the antifreeze mixture should be drained from the car if the mechanic replaces it

156. ## statistics

Science scores for HS seniors in the US are normally distributed with a mean of 77 and a standard deviation of 7. Students scoring in the top 4% are eligible for a special prize. What is the approximate cutoff score a student must get in order to receive

157. ## physics

A 7 kilogram bowling ball is dropped from a fourth story window. If each story is 3 meters high, use energy conservation (not the equations of motion) to find the ball's velocity when it strikes the ground. Ignore air resistance. 1/2 m v^2= mgh v= sqrt

158. ## Economics

Hi, I was wondering if you know any good websites were I can review for a grade 12 economics exam?

160. ## Calculus based physics

A particle travels along a path described by the function y=0.2x^3. The exponent of velocity is given by vx=(5t^2)ft/s. When t=0, x=y=0, find the particle's distance from the origin and the magnitude of its acceleration when t=1s.

161. ## English

Writeacher, I left out a sentence I would like you to check. 1) Mr. Gradgrind's name is composed of two words: Gradgrind: Grade: a particular standard or level of quality of a product + Grind: to crush into powder. Actually, he crushes his students with

162. ## cal3/algebra help me!

Find and classify all local minima, local maxima, and saddle points of the function f(x,y)= -3yx^2-3xy^2+36xy I really need help answering this one!! Please answer in detail! Thank you This is what I have so far... D=FxxFyy-(Fxy)^2=(-6y)(-6x)-(-6x-6y+36)^2

163. ## Calculus

Let f be the function defined by f(x)= x^3 + ax^2 +bx + c and having the following properties. 1. the graph of f has a point of inflection at (0,-2). 2. The average value of f(x) on the closed interval (0,-2) is -3. Determine the values of a,b and c

164. ## math/cal/trig solve for t

solve for t: 0=4sin(2t)cos(2t)-sin(2t)

165. ## Physics

A 1 kh pendulum os pulled sideways so that it is raised a vertical distance of 2 m above it's resting point. Find the max. Speed the pendulum reaches after being vertical

166. ## Math

Transform the equation by completing the square: 4x^2 + y^2 - 8x + 6y -3 =0 Also show foci

167. ## math

the perimeter of a square is 24in. what is the length of each side?

199. ## Math

You play a game where you win $1.00 for each dot that turns up on a fair die (has 6 sides). You pay$3.50 to play the game (and the money is not returned). Find the expected (average) winnings for this game.

200. ## physics

A light spring having a force constant of 110  is used to pull a 15.0  sled on a horizontal frictionless ice rink. The sled has an acceleration of 1.60 ? [2/27/12 9:41:56 PM] Matt Yeager: By how much does the spring stretch if it pulls on the sled at

201. ## Basic Math

How do you solve: 5/30 + 3/40 + 1/8

202. ## English

Writeacher,can you please check if everything is correct? Thank you. 1) Can you give me a hand to finish this exercise, please? 2) The answer to your question is on he tip of my tongue. 3) Behave yourself! Don't shrug your shoulders! 4) I can't see at a

203. ## why will no one answer? chem

If the reaction Cl2 (g) + O3 (g) = Cl2O (g) + O2 (g) occurred in just two steps, what would be the overall order of the reaction be? a. 1 b. 2 c. 3 d. 4 e. not possible to determine from the information given i have absolutly no idea how to do this

204. ## math

I want to put a 3ft wide walk around a 10ft by 15 ft pool. What is the perimeter around the figure including the path?

244. ## Math

The largest tree in the world is the General Sherman sequoia in Sequoia National Park, California. It is 275 feet high, has a diameter of 36.5 feet, and has an estimated weight of 2,150 tons. Fin the sequoia's circumference to the nearest tenth of a foot.

245. ## Calculus

flickr.(dotcom)/photos/77304025@N07/6782789880/ Create a function that closely gives the graph given below. The function may be a piecewise function but it does not necessarily have to be a piecewise function. a. Give a brief narrative explaining what you

246. ## Robert Frost/English/Ms.Sue

Yes, i'm referring to the Poem. I don't understand how hate and ice can cause a world tradegy.

247. ## Calculus

If y= pie^2 then dy/dx = 2pie true or false ?

248. ## biology

list 2 forms of oxygen found in the atmosphere name the process by which [1]oxygen from the atmosphere is used up [2]oxygen is returned to the atmosphere

261. ## Web Scripting

I'm using actionscript. when you press the mouse, you can draw (using a rectangle) and when you click the mouse it changes colors. What I need to do is have buttons so that a user can click on the button to choose the color they want. How can I do this?

262. ## Chemistry

What is the chemical equation for AgNO3 + NaCI?

263. ## bio

Many studies have shown that extinction is a natural process that occurred long before humans ever evolved. Explain the importance of conservation genetics in the survival of endangered species. Why should we be so concerned about extinction now?

264. ## PHYSÝCS

please any one help me for this question The figure shows the paths of a golf ball your friend drops from the window of her apartment and of the rock you throw from the ground at the same instant. The rock and the ball collide at x = 34.14 m, y = 17.75 m,

265. ## Written Communication

• Choose a topic from your personal knowledge and experience. Remember that you must utilize your first-hand experience to prove your authority to write on a topic. Purely generalized and/or factual information is not acceptable. • Capture your

266. ## chemistry

If the reaction Cl2 (g) + O3 (g) = Cl2O (g) + O2 (g) occurred in just two steps, what would be the overall order of the reaction be? a. 1 b. 2 c. 3 d. 4 e. not possible to determine from the information given i have absolutly no idea how to do this

267. ## Math

Davis Thomas is a file clerk. he earns 4.10 an hour he worked 20.5 hours last week. What is his straight time pay?

268. ## Written Communication

• Choose a topic from your personal knowledge and experience. Remember that you must utilize your first-hand experience to prove your authority to write on a topic. Purely generalized and/or factual information is not acceptable. • Capture your

269. ## English

I forgot to include these sentences. Thank you. 1)If you don't want to catch your teacher's eye, you'd better not yawn. The doctor prescribed a painkiller to be taken (is "to use" possible?) twice a day on a full stomach. 2)My leg hurts/aches/is sore/ I've

270. ## english fixed-3

here's what i did for number 4. The world is deserting because we are taking water for granted. If people continue to waste water, the earth’s structure will change and it will be the main cause of earthquake and potentially a tsunami. and for number 5.

276. ## trig

Tan(cos inverse 5x)

303. ## algebra

-x^3+x^2+4x-5=0

304. ## COLLEGE CALCULUS.

i don't understand this problem Let F(x)=f(x^4) and G(x)=(f(x))^4. You also know that a^3=2, f'(a)=13, f'(a^4)=15. Find F'(a) and G'(a).

305. ## math133

1/4=3-2x-1/x+2

306. ## STATS

The vice-president of a business firm has reviewed the records of the firm's personnel and found that 70% of the employees read The Wall Street Journal. If the vice president was to choose 12 employees at random, what is the probability that the number of

307. ## math

For #s 4-7 #4) is Increase 35 by 40% 35 * 1.4 = 49 #5)Increase 125 by 8% 125 * 0.08 = 10 #6) Decrease 8 by 75% 8 * 0.75 = 6 #7) Decrease 135 by 22% 135 * 0.22 = 29.7 ARE THESE CORRECT YOU HAD TO FIND THE NEW AMOUNT.

308. ## science

How much energy is required to raise the temperature of 22.8 g of copper from 30°C to 1250°C?

309. ## Neuroscience

compare ionotropic and metabotropic receptor channels in both structure and function

Need a copy of pages 163 and 164 from Business and Administrative Communication, 8th edition

311. ## Math

in the diagram below,

312. ## education

How does data collection integrate with your teaching and learning in the classroom and How do data analyses affect your instructional strategies

313. ## chemistry

explain how you would develop a scheme to separate and identify ag, pb, fe,and al in a solution that might contain all four as ions

314. ## PHYSICS

A car is moving at a constant velocity of 5.5m/s. How much net force is required to raise its velocity to 14 m/s in 30 seconds? Suppose the car has a mass of 150kg.

315. ## Math

Transform the equation or inequality by completing the square. y^2+3x-6y-7=0

316. ## PHYSICS

A car is moving at a constant velocity of 5.5m/s. How much net force is required to raise its velocity to 14 m/s in 30 seconds? Suppose the car has a mass of 150kg.

317. ## math

800 student in a class 3/4 of them ordered pizza and 1/2 ordered pepperoni toppings how many like pepperoni toppings pizza the best

318. ## trig

Name three values of theta that would result in y equal to cot times theta being undefined.

319. ## calculus

I just cannot get this one. I think I have to do something with log but that's as far as I can go. 5^x=100

321. ## Math pleez help

Multiply ( x-1) (2x(2)-xt5)

322. ## Physics

An object has a mass of 8.99KG and is moving at 2.55 m/s. How much kinetic energy does it have ?

323. ## geometry

If the m of angle AMD =x+2y and m og angle ABC=2x-y. Find the values of x and y

324. ## chem

How much energy is required to raise the temperature of 217 g of solid mercury at its freezing point to mercury vapor at its boiling point.

325. ## Algebra

Find the roots of the given equation by completing the square. αx^2 + βx + δ = 0

326. ## maths

Given A = (X-2 1 ) 2 X-3 is a singular matrix,find the value of x

327. ## MATH

Indira gets 12 birthday presents. She opens 2/3 of them. how many presents does she have left to open?

328. ## General Chemistry

How do I calculate the ratio of weak base to weak acid in a methyl amine buffer solution at pH=10.645 and pH=11.645 and pH=9.645?

329. ## WORLD HiStOrY

Despite the advice of her councilors, Elizabeth chose never to marry. From a political point of view, do you think her decision strengthened or weakened her position as queen? Why?

330. ## math

A student observes two different types of cells under a microscope. She noticed that one cell had many more mitochondria than the other. What can the student predict about the cell with more mitochondria?

331. ## math

Which is not equal to 2 quarts? 2c, 4 pints, 1/2 gallon or 64 fluid oz.

332. ## maths

Given that A =(X-2 1 ) 2 X-3 IS a singular matrix,find the value of x.

333. ## science

One factor determining the effect of gravity on objects is their.....? The farther away from Earth an object gets, Earth's gravity affects it ......? Friction that occurs between the surface of around object and another surface is ........? Objects with

334. ## chemistry

A particular reaction has an activation energy of 51.6 kJ/mol-rxn. How much faster is the reaction at 50 degrees C versus 25 degrees C? a. 2 times b. 5 times c. 3 times d. half as fast d. 20% as fast think it has something to do with the Arrhenius equation

335. ## tRiG/ AlGeBrA

1) Use double-angle identities to write the following expression, using trigonometric functions of x instead of 4x. cos 4x 2) Use half-angle identities to write the following expression, using trigonometric functions of x instead of x/4. sin x/4

336. ## MATH

in the diagram below,

337. ## PHYSICS

A car is moving at a constant velocity of 5.5m/s. How much net force is required to raise its velocity to 14 m/s in 30 seconds? Suppose the car has a mass of 150kg.

338. ## AStrONomY

What contributions of Uranus were made by the Voyager 2 program?

339. ## physics

Limo kicks a ball vertically upwards from 1m above the ground at 18m/s. It rises to its highest point and then falls down, just getting caught on a branch 5.5m above the ground. (ignore any sideways movement) How long is the ball in flight?

340. ## chemistry

alculate the H3O+ concentration present in water under the following conditions. Enter your answer in scientific notation. a. [OH-] = 8.9 x 10-5 M 1.1E-10 b. [OH-] = 3.8 x 10-3 M 2.6E-12 c. [OH-] = 4.8 x 10-12 M 2.1E-3

341. ## language arts

i'm doing a project on choosing some "status symbols" popular in society today. one status symbol i did was the restaurant called cheesecake factory, how do i explain how it is popular/important today?

342. ## maths

Prove the following trigonometric identities (i)(1+cotx)^2 +(1-cotx)^2=2cosec^2x (ii)cos(270degrees+theta)/cos(360degrees -theta)

343. ## maths

solve the following equation for the value of theta between 0 degrees and 360 degrees.For 5 + 3cosec^2theta =8

344. ## algebra2

Can you explain how to factor the following trinomials forms: x2 + bx + c and ax2 + bx + c. Can there be more than one way to factor a problem like this? can you please show it in written word and step by step?

345. ## math

Jerry read 180 pages in 3h. Peggy read 220 pages in 5h. Peggy said that they read at the same rate. Is she correct?

346. ## math

There is 10 white,9 black and 7 red balls in a bucket,In how many ways we can select one or more balls?

Would someone please be kind enough to explain steps for this one. Thank you. If m and n are positive integers and m is 250% of n, what percent of m is 2n?

348. ## physics

If the length of the wedge is not given then what should we answer about that a partical is thrown horizontly hit the wedge or not?

349. ## statistics

A SINGLE CARD IS SELECTED FROM A STANDARD DECK OF 52 CARDS. IF YOU KNEW THAT THE CARD WAS A PICTURE CARD, WHAT IS THE PROBABILITY THAT IT WAS ALSO RED?

350. ## Science

State the two broad classes of wood and describe them.

351. ## Calculus

flickr.(dotcom)/photos/77304025@N07/6782789880/

358. ## math

How do you figure the next geometric sequence of 90,18,3.6,073

359. ## health

the messages you receive from others that indicate who they think you are or what they think you are like.

360. ## Math (Area)

I need help on where to begin with this problem. You are installing a new deck around your pool. The pool is rectangular with the dimensions 8m by 4m. The deck will surround the pool and will have a width by 2m. What is the area of the deck? I know that

361. ## Math

flickr.(dotcom)/photos/77304025@N07/6782789880/ Create a function that closely gives the graph given below. The function may be a piecewise function but it does not necessarily have to be a piecewise function. a. Give a brief narrative explaining what you

362. ## PHYSÝCS

At the end of the spring term, a high school physics class celebrates by shooting a bundle of exam papers into the town landfill with a homemade catapult. They aim for a point that is 31.1 m away and at the same height from which the catapult releases the

363. ## Simple how-to to do in french?

For my french class i have to do alittle how-to for around 5 min. It has to be something I can explain to the class in french and then the rest of the class make or participate in. I am in french 4. I was thinking of making a unique type of paper airplane

When I say four thousand houses in Spanish, is it gender dependent like cuatra mil ollas or do I simply say cuatro mil ollas. I know the numbers from 200-900 are gender dependent but I'm not sure when you get to the four in front of thousand houses because

365. ## health

generally having a positive outlook, being comfortable with self and others, and being able to meet life's challenges.

366. ## MATH HELPPPP

in the diagram below,

367. ## stats

please help How do you construct a pay of table?????? . Dr. Mike Adams, a local brain surgeon, believes there is a lot of money to be made renting apartments to students here in Alamosa. He is considering constructing one, two, or possibly three apartment

368. ## chemistry

The decomposition of hydrogen peroxide in solution and in the presence of iodide ion was studied in laboratory, and the following mechanism proposed based on the experimental data. H2O2 + I - = H2O + IO - (slow) H2O2 + IO - = H2O + O2 + I - (fast) Which

369. ## health

what are five signs of good mental health?

370. ## math

A customer uses a $20 bill at a self check-out register to pay for products totaling$14.50. The customer is concerned they did not receive the proper change. How much money should they have received back from the automated register?

371. ## math

A driver is headed north on a long, straight highway and sees this sign: Nearville 150 miles Farville 160 miles Then, surprisingly, an hour later she sees this apparently inconsistent sign on the same highway: Nearville 100 miles Farville 109 miles How can

372. ## math

Transform the equation or inequality by completing the square. x^2+y^2+4x-10y+20

393. ## Mathematics

What percentage is 2/27?

395. ## Grammar

I am studying my pronouns right now for sixth grade, while i was looking over the words,i saw that the word THAT is a pronoun, how can it be a pronoun?

396. ## why will no one answer? chem

The decomposition of hydrogen peroxide in solution and in the presence of iodide ion was studied in laboratory, and the following mechanism proposed based on the experimental data. H2O2 + I - = H2O + IO - (slow) H2O2 + IO - = H2O + O2 + I - (fast) Which