Val

This page lists questions and answers that were posted by visitors named Val.

Questions

The following questions were asked by visitors named Val.

A example of a nonprogrammed decision for a clothing manufacturer is a. allocating bonuses to employees. b. acquiring a new supplier for cloth. c. deciding to market products using the internet. d. selecting which customers to offer discounts to. Nataly w...

19 years ago

i need some help with this pleez! f(x+6) f(x)=3x^2-5x+3 if u could explain in steps that would be great! :) If f(x) = 3x^2-5x+3, then f(x+6) = 3(x+6)^2 + 5(x+6) + 3 Multiply that out and combine terms.

18 years ago

Supposing that if A is equal to 1, b=2,etc. all the way to z equaling 26, what word or words starting with a B and a C total 100?

16 years ago

A typical Latino coffee farmer has fixed costs of $10,000 per year. Under the old distribution system, the farmer is paid $.40 per pound (U.S. weight measure) and the farmer’s variable cost per pound is $.30. What is the farmer’s breakeven point in units...

15 years ago

where does the n come from in a compound such as n-butane?

15 years ago

Could someone explain the reasoning for this? 6) Which of the following is a false statement about ALL reactions in equilibrium? a) Increasing temperature shifts the reaction toward the products in an endothermic reaction b) Temperature effects on the equ...

15 years ago

Consider the gas-phase equilibrium A ⇌ B. In a series of experiments, different initial amounts of A and B are mixed together, and the mixture in each case is allowed to come to equilibrium. Which one of these experiments would yield values for the amount...

15 years ago

Given the equilibrium: HCN(aq) + H2O(l) ←→ H3O+(aq) + CN-(aq) ΔH >0; Ka = 4.0 x10-10 What happens to the concentration of hydrogen cyanide [HCN] when the following stresses are placed on the system at equilibrium? NaCl is added ---> Stays the Same but Why...

15 years ago

Predict whether Fe(OH)2 will dissolve, precipitate, or do neither after: (a) water is added --> dissolve (b) Fe(OH)2 is added--> neither (c) Solid Fe(NO3)2 is added--> precipitate (d) Solid KNO3 is added---> neither I'm given the answers...but no explanat...

15 years ago

Suppose that 30.0 mL of 0.20 M C6H5COOH(aq) is titrated with 0.30 M KOH(aq). Refer to table 1 and table 2. (a) What is the initial pH of the 0.20 M C6H5COOH(aq)? Using ICE i found to be 2.46 The rest I do not know how to set up or solve... (b) What is the...

15 years ago

I have another similar problem. I have calculated everything given (Correctly), but I can't seem to get the right pH for the stoichiometric point (I keep getting 7.16) Question: Suppose that 50.0 mL of 0.25 M CH3NH2(aq) is titrated with 0.35 M HCl(aq). Re...

15 years ago

Suppose that 0.483 g of an unknown monoprotic weak acid, HA, is dissolved in water. Titration of the solution with 0.250 M NaOH(aq) required 42.0 mL to reach the stoichiometric point. After the addition of 21.0 mL, the pH of the solution was found to be 3...

15 years ago

I am confused about where I am going wrong here... Suppose that 1.331 g of impure barium hydroxide is dissolved in enough water to produce 250. mL of solution and that 35.0 mL of this solution is titrated to the stoichiometric point with 17.6 mL of 0.0935...

15 years ago

Suppose that two hydroxides, MOH and M'(OH)2, both have Ksp = 1.0 10-12 and that initially both cations are present in a solution at concentrations of 0.0036 mol · L-1. Which hydroxide precipitates first? I know MOH ppt's first...but am not sure how to ap...

15 years ago

Use the data in this table to calculate the solubility of each sparingly soluble substance in its respective solution. (a) silver bromide in 0.066 M NaBr(aq) mol · L-1 I know how to do this one, found it to be 1.167E-11 which is correct. (b) nickel(II) hy...

15 years ago

For the following electrochemical cell, what is the correct, balanced reaction? Cu(s) | Cu2+(aq) || Ag+(aq) | Ag(s) A. Cu(s) + Cu2+(aq) → Ag+(aq) + Ag(s) B. Cu(s) + Ag+(aq) → Cu2+(aq) + Ag(s) C. Cu(s) + 2 Ag+(aq) → Cu2+(aq) + 2 Ag(s) D. Cu2+(aq) + Ag(s) →...

15 years ago

H1+(aq) + Fe(s) ==> H2(g) + Fe2+(aq) I am trying to balance this equation...but I am not sure how to balance the H's. I have the half rxns as e- + H+(aq) ==> H2(g) Fe(s) ==> Fe2+(aq) + 2e- I multiplied the reduc. rxn (top) by 2 so I could get rid of the e...

15 years ago

1)) The following two half-cells are paired up in a voltaic cell. How will lowering the pH affect the E of the overall cell? ClO3-(aq) + H2O(l) + 2e- ==> ClO2-(aq) + 2OH-(aq) Eo= 0.35 V I2(S) + 2e-==> 2I-(aq) Eo = 0.54 V A)dE will increase B)dE will decr...

15 years ago

Ive posted twice, but no one's answered yet...I could really use any kind of guidance--particularly for the 1st question :) 1)) The following two half-cells are paired up in a voltaic cell. How will lowering the pH affect the ƒ´E of the overall cell? ClO3...

15 years ago

trying to post a question, but it says I'm not allowed to post internet addresses--but I'm not. any ideas on this?

15 years ago

Gallium65, a radioactive isotope of gallium, decays by first order-kinetics. The half-life of this isotope is 15.2 min. How long would it take for 7/8 of a sample of this isotope to decay? 15.2 min 30.4 min 45.6 min 48.0 min I'm not sure how to do this. I...

15 years ago

Given the elementary reaction: 2 NOBr==>2 NO + Br2 k = 0.80 Which variables obtained for this reaction will produce a straight line? log[NOBr] vs. t [NOBr] vs. t [NOBr]2 vs. t 1/[NOBr] vs. t instinctively i would choose B, but I am not sure what my prof i...

15 years ago

Pt | Fe2+ (6.4010-5 M), Fe3+ (0.0460 M) || Sn4+ (2.7010-4 M),Sn2+ (0.0750 M) | Pt i need to calculate the voltage of the cell. I know to use E=emf- (RT/nF)lnQ .... I think my problem is with setting up Q. I'm confused on what goes on top and what goes on...

15 years ago

Pt(s) | H2(g, 2.0 bar) | H+ (pH = 3.0) || Cl -(aq, 0.85 mol·L-1)) | Hg2Cl2(s) | Hg(l) I need to calculate the voltage of the cell. I have a pretty good idea of how to use the Nernst equation for this, but am unsure if I am calculating the concentration of...

15 years ago

Pt(s) | H2(g, 2.0 bar) | H+ (pH = 3.0) || Cl -(aq, 0.85 mol·L-1)) | Hg2Cl2(s) | Hg(l) I need to calculate the voltage for the cell. I have used 1E-3 M for my concentration of H+ given the pH=3 . I don't know how to incorporate the 2.0 bar into the nernst...

15 years ago

Determine the unknown quantity in the following cell at 298.15 K. Pt(s) | H2(g, 1.0 bar)| H+(pH = ?) || Cl -(aq, 1.0 mol·L-1) |AgCl(s), Ag(s), ΔE = +0.36 V. (DrBob) I still wasn't able to figure out the other one--I posted again after that one, but I know...

15 years ago

How much time is required to electroplate 6.530 µg of chromium from a potassium dichromate solution, by using a current of 118 mA? I thought the ratio of e- to moles chromium would be 6/2 but I guess that is wrong? I am using t= nF/A I already made the pr...

15 years ago

When 442 mg of NO2 is confined to a 150. mL reaction vessel and heated to 300°C, it decomposes by a second-order process. In the rate law for the decomposition of NO2, k = 0.54 1/(M·s). A) what is the initial reaction rate? B) what is the reaction rate if...

15 years ago

I need to find the rate constant. I know that it takes 2A to make B, but I am mixed up on how to figure out how to find the concentration of A at 69s

15 years ago

The half-life for the second-order reaction of a substance A is 55.8 s when concentration of initial A = 0.69 M. Calculate the time needed for the concentration of A to decrease to the following values. (a) 1/8 of its original value (b) 1/9 of its origina...

15 years ago

2A-->B+C given that the initial concentration of A is .022M and that at 69 s, the concentration of B increases to .0095M, what is the rate constant? i know I need to find the new concentration of A at 69s, but I am having trouble with findthing this. I th...

15 years ago

For the first-order reaction A => 3 B + C, when [ A]0 = 0.014 mol·L-1, the concentration of B increases to 0.017 mol·L-1 in 2.7 min. (a) What is the rate constant for the reaction expressed as the rate of loss of A? I found this to be .1923, which I know...

15 years ago

The hydrolysis of sucrose (C12H22O11) produces fructose and glucose (each C6H12O6). Two mechanisms are proposed: I) Step 1: C12H22O11 --> C6H12O6 + C6H10O5 (slow) Step 2: C6H10O5 + H2O--> C6H12O6 (fast) II) C12H22O11 + H2O--> C6H12O6 + C6H12O6 Would these...

15 years ago

X(g) + 2 Y(g) + 2 Z(g) -->3 M(g) + 2 N(g) I've already found the orders for the following to be: X is 2nd, Y is 1st, Z is 0 and overall of course is 3. But I am confused about the below question. I initially guess that No it doens't occur in one step..but...

15 years ago

Having some confusion with this question....I have the answers, just not able to reach them. A flask of volume 5L is evacuated and 43.8 g of solid N2O4 is introduced at 77K. The sample is then warmed to 298K during which the N2O4 vaporizes and some dissoc...

15 years ago

Could someone walk me through this problem? 6CO2 + 6H2O --> C6H12O6 + 6O2 partial pressure of CO2 is .26Torr, temp is 25 celsius, calculate volume of air to prouduce 10g glucose I keep getting confused with stoichiometry....my thinking: convert 10 g gluco...

15 years ago

A mutation has occurred in one chromosome of a spermatogonium. This mutation will show up in how many of the gametes produced from this cell? Choices: A. None B. Two C. All Four D. Cannot be determined I believe it is 2....If the mutation occurs in the sp...

15 years ago

Justin had 44 dollars before spending n dollars on jeans. How much money remains

15 years ago

How can you find an unknown factor in a multiplication problem? Is the answer: divide the two numbers that you have?

15 years ago

A stone thrown off a bridge 20 m above a river has an initial velocity of 12 m/s at an angle of 450 above the horizontal. a. What is the range of the stone? b. At what velocity does the stone strike the water? (magnitude and direction)

15 years ago

Hello, I am looking at the subject of no-count nouns. Which says that it does not have a singular or a plural form. The school book gives Paper for an example. But since you can say "papers" which is plural. How can paper be a non-count noun?

15 years ago

force of a toy jeep if the mass=50kg & is traveling at 4m/s& the radius is 50 centimeters.

14 years ago

determine the velocity of a toy jeep if it has a distance of 80 meters and a time of 8 seconds?

14 years ago

Acceleration is F/S A=F/M this is: direct inverse not sure both direct &inverse

14 years ago

change 85 kilograms to grams change 45 meters to centimeters change 70 nanometers to meters

14 years ago

A tower is supported by a guy wire from the top of the tower to the ground 16 ft from its base. The wire makes an angle of 62 with the ground. The length of the wire is a. 30.09 ft b. 18.12 ft c. 28.41 ft d. 34.08 ft

14 years ago

You have been hired as an administrator in an ambulatory care setting. What factors would you expect to encounter and how would you deal with them?

14 years ago

how many grams of potassium chlorate must be used to produce 30.0g of oxygen?

13 years ago

What effects do herding in East Africa and ranching in North America have on those two environments?

13 years ago

1. How do Fairhead and Leach explain the forest-savanna mosaic in West Africa? a) villagers planted trees and told stories about them b) corporations began logging and mining in the region c) the state prohibited slash and burn farming and created a natio...

13 years ago

The state lottery claims that its grand prize is $1 million. The lucky winner will receive $50,000 upon presentation of the winning ticket plus $50,000 at the end of each year for the next 19 years. Why isn't this really a million-dollar prize? What would...

13 years ago

2*6=4, 4*1=7 8*3=1 find value of 5*5

13 years ago

how many liters of ethanol contain 1.5 kg of ethonal?

11 years ago

Hadley's softball team has a phone tree in case a game is canceled. The coach calls 3 players. Then each of those players calls 3 players, and so on. How many players will be notified during the third round of calls? Please help answer

10 years ago

The square tile shown has a side length of 10.5 inches. What power can you write to represent the area of the tile? Write the power as an expression with a base and exponent, and then find the area of the square.

10 years ago

Antonia is saving for a video game. On the first day, she saves two dollars in her piggy bank. Each day after that, she doubles the number of dollars she saved on the previous day. How many dollars does she save on the sixth day?

10 years ago

Brandon has 32 stamps. He wants to display the stamps in rows, with the same number of stamps in each row. How many different ways can he display the stamps? Please help answer and explain

10 years ago

Please list five numbers that have 3, 5, and 7 as prime factors. Please help answer thanks

10 years ago

Pani says she should get $3 discount on the price of each shirt and $3 discount on the price of each pair of jeans. Part 1 write and simplify an expression to find the pint she would pay if this is true. Part 2 if you were the shop owner, how would change...

10 years ago

Multiply each expression. 6(h-4) I know you multiply the numbers 6*4 but where do you go from there? I am so frustrated

10 years ago

How many kcal of heat energy are removed from the body with every 1 L of sweat?

10 years ago

a man swims at a speed of 50 m/min in stil water, swims 100m against the current and 100m with the current. if the difference between the two times is 3 m 45 s, find the speed of the current

10 years ago

After this ﬁrst encounter, the bird then turns around and ﬂies from the runner back to the ﬁnish line, turns around again and ﬂies back to the runner. The bird repeats the back and forth trips until the runner reaches the ﬁnish line. How far does the bird...

10 years ago

Tom is sladding down a hill. His sled starts from rest, and undergoes a uniform acceleration of 2.0 m/s2 down the slope. What is his speed after 1 second?, after 2 seconds? after 3 seconds?

10 years ago

In the hydrogen atom, the distance between the electron and the proton is 5x10^-11m. a)Compute the magnitude of the gravitational force FG between the electron and the proton b)Compute the magnitude of the electrical force FE between the electron and the...

9 years ago

A person weighs 600 N on Earth. What is the person's mass?

9 years ago

How are the cultures of South America like the cultures in Mexico? How are they different? I just need one sentence of how they are similar and different. Thanks :)

9 years ago

In which of these lines is the meaning of the word "intercede" best expressed? A) the attacker interceded between the goal and the goalie. B) In court cases, attorneys intercede on their clients behalf.**** C) If you don't agree with someone, you should t...

9 years ago

Hello, I was just wondering what it means when something says "a white flower is crossed with a red flower" Could anyone please tell me?

9 years ago

The time between a lighting flash and the following thunderclap may be used to estimate, in kilometers, how far away the storm is. How far away is the storm if 12 seconds elapse between the lighting and the thunderclap? a) 4 kilometers b) 5 kilometers c)...

9 years ago

Find the lateral area for the square pyramid. Height: 22 Base: 8 Side: 8 I know the answer, I just want someone to show me how to actually calculate it to find the answer. Thanks :)

9 years ago

What is the surface area of the given figure? Side: 26 Side: 28 Height: 10 Width: 36 a) 2,564cm^2 b) 2,276cm^2 c) 2,184cm^2 d)1,160cm^2

9 years ago

Where is most of the surface water on earth found? a) as freshwater in rivers b) as frozen water near the pole c) as groundwater under the surface d) as salt water in oceans I think its either A or D. Am I correct?

9 years ago

In which sentence about A Christmas Carol is the word meager used correctly? a) The Ghost of Christmas Future used his meager finger to point to Scrooge's tombstone. b) Scrooge gave Adam a meager amount of money to reward him for buying an enormous turkey...

9 years ago

Which is the best display for the set of numbers of daily 911 calls made in a month, if you want to be able to identify the mode? a) histogram with intervals of 5 b) histogram with intervals of 3 c) line plot d) line plot I think its either A or D

9 years ago

I'm trying to write a compare and contrast essay about animal cells and plant cells. I need differences and similarities between them. Could anyone please help me? Oh, and it would be nice if you started me off with a few sentences so I would continue it.

9 years ago

Read this sentence. For people who are more comfortable with just one method to do something, this can seem a bit much. Which is the MOST vivid phrase to replace the last three words. a) rather overwhelming b) more than is necessary c) quite funny d) too...

9 years ago

Order the volumes from least to greatest. 1) 56.18 2) 43.75 3) 9 4) 10.92

9 years ago

For the system, H2(g) + X2(g) <--> 2HX(g), Kc = 24.4 at 300 K. A system was charged with 2.00 moles of HX in a 3.00 liter container. The catalyst was introduced using a remote unit, and the system was allowed to come to equilibrium. How many moles of H2(g...

9 years ago

Marie has scores of 65,72,80,74, and 85 on five math tests. The final will count as two tests in determining each students overall average. What score must Marie get on the final if she wants her overall average to Ben 80?

8 years ago

I think the answer is (e) but I'm not certain. In Drosophila melanogaster the genes for yellow body colour and white eye colour are linked this means that: a. They can produce only one phenotype b. They cannot separate c. They produce more parental types...

8 years ago

At 2:00 pm a car's speedomoter reads 20 mph, and at 2:10 pm it reads 25 mph. Use the Mean Value Theorem to find an acceleration the car must achieve.

8 years ago

How can a multiplication model help you solve problem 1

6 years ago

Angle ab&c measures 120 degrees. It is divided into two smaller angles, which are labeled x & y. The value of x is 4 times the value of y, what is the value of x?

5 years ago

When solutions of H2SO4 and NaOH react, the balanced molecular equation is: H2SO4 (aq) + 2 NaOH(aq) Na2SO4(aq) + 2 H2O (I) How much Na2SO4 is obtained when 4.00 g of H2SO4 reacts with 4.00 g of NaOH?

5 years ago

Do I do sig figs for answers that are still needed for other calculations? For example, if I am calculating the molarity (0.005123 mol / 0.30L) = 0.017077 M, the sig figs would be 0.017 right?, but what if I need this molarity to do another calculation? S...

4 years ago

The height (h) in centimetres of Shuntaro’s pogo stick from the ground as he jumps on it since s seconds have passed is roughly modelled by the equation h(s) = sin^2(4x) + 2sin^2(4x) + 1 a) How many times does Shuntaro hit the ground in the first 5 second...

4 years ago

Answers

The following answers were posted by visitors named Val.

Im in FLVS....most classes are the easiests but this one is pretty annoying and confusing with all the damn work.

16 years ago

We would be 50 separate countries

16 years ago

Nevermind I researched it for a few hours and finallly figured it out :)

15 years ago

oops so nevermind I realized i made a mistake when calculating the molar mass. I found it to be 46 g/mol but I am still unsure how to find the pKA value. Thanks!

15 years ago

that simple and I've been working on this stuff for 5 hours! Thanks DrBob...I really wish my professor was able to break things down so clearly. Nice lady but she has a way of making me more and more confused... as for a PUG chart..maybe that's her own th...

15 years ago

HA + OH- ---> H2O + A- .05 .03 0 0 "P"ut in -.03 -.03 +.03 +.03 "U"se up .02 0 .03 .03 "G"et Out It didn't line up well the first time. It makes sense to me...just a little tedious. If you have never seen this, what way have you taught your students do so...

15 years ago

Thanks :)

15 years ago

I literally spent about 15 minutes retyping and rewording things....oh well

15 years ago

Nevermind, I made a silly mistake in my calculations...I figured it out :)

15 years ago

Yes that's what I used to to try to find the voltage. But my answer is still coming out to be -.1833 which is incorrect

15 years ago

where does the .0592/2 come from? I've been calculating my RT/nF to be .025693/2 ....this is all so confusing...

15 years ago

Oops, forgot to post the question. 2A-->B+C given that the initial concentration of A is .022M and that at 69 s, the concentration of B increases to .0095M, what is the rate constant?

15 years ago

i tried multiplying 7/8 and 8/9 by .69 each to find the respective initial concentrations of A to then use for the half life equation t=1/ k*[ A ]

15 years ago

use t= (1/ [ A]) - (1/ [A ]o) over k

15 years ago

ooh nevermind i made a silly error...i have the answer now :)

15 years ago

I am taking this course over again for the second time and it is easy for students that have been out of school for a while

15 years ago

Do you need to regroup to find 73-35 ?

im not sure which one is correct. maybe A

9 years ago

Oh, I forgot. Use the formula d = t/3 where t is the time, in seconds, between the flash and thunderclap.

9 years ago

I meant base, base is 36.

9 years ago

Is it b then?

9 years ago

Thanks. B was my first answer anyway.

9 years ago

Ahh, double post. Sorry! Ignore this question

9 years ago

Either A or B

9 years ago

Like which one has the highest volume, lowest volume, etc..

9 years ago

ln2 x ln2 x ln2 a + a + a (substitute) 3a

1. B. 3/4,0.75,75% 2. A. 3/8,0.375.37.5% 3. D. 1/2 4. B. 1/2 5. D. 72 6. D. (I'm not writing all of that but just trust me) 7. C. 32 8. D. 1/48 9. D. 11/20 10. D. 120 11. C. 220 12. C. 5!;120 13. B. 3/8 14. C. 380 15. C. 30 16. B. 6,840 17. B. 1/45 18. B....

6 years ago

800 N

6 years ago

in a particular experiment to prepare a compound, the theoritical yield is 34.7 g. if the actual yield is 31. 2 g, what is the percentage yield?

thank you so much i over thought this so much it made me go insane. :)

4 years ago

What is the meaning of mus

3 years ago

k1k2[N2O5] / k2+k-1 *the numbers following the k's are the subscripts

3 years ago

Let x be the angle. So its telling you is 76 less than the angle, so one side will be x-76. The other angle will be x. So athe the end we have x-76 + x= 180. Lets move 76 to the other side as positive and add like terms: 2x=256 x=128