# chemistry! URGENT

60,378 results, page 12

### Chemistry (urgent)

Hi, I have a few chemistry problems that I'm having trouble solving. I put my attempted solutions after the problems in *'s. There was one problem I had no idea how to solve. What concentration of silver chromate (Ksp = 9.0 x 10-12) will dissolve to make a saturated solution ...

### CALCULUS-URGENT

find the radius and interval of convergence for the series the series from n=1 to infinity of ((-1)^(n+1)*x^n)/n! I did the ratio test so I had the Lim as n approaches infinity of -x/(n+1), but this is 0, giving no radius, so I think I did something wrong...

### Grade 8 math urgent

Gervais ate 1/3 of a aguette with his dinner. Chantel ate 1/4 of the leftover bagette as an evening snack. What fraction of the baguette did Chantel eat as a snack. My answer is 1/12. Am I correct?

### Algebra 2 URGENT

Sally invested a total of $4500, some at 9% per year and the rest at 6% per year. The return from the 9% investment exceeds that from the 6% investment by $180. How much did she invest at each rate?

### Art

PLEASE HELP! URGENT! I need to find an example of where buddhist art can be found today like an example of it.. a statue, temple, etc. I need one so i can write about it. Thank you soo much!

### math super urgent

Louis and his friends shared an equal amount of money between them. They each got $1.20. How much money was there? How many friends did Louis have? also please explain answer.

### Math- urgent

A golf ball can travel 170 mph. This is 10/7 times the fastest speed recorded for a hockey puck. What is the record speed for a hockey puck? Make and equation and solve.

### Math Urgent

To form a certain sequence, the rules are: 1)If a number is even, divide by 2 to get the next number 2)If a number is odd, multiply by 3, then add 1 to the the next number. Starting with 12,the 1000th term would be... a.1 b.2 c.3 d.4 THANKS

### Math

What is the constant of variation? An x-y table shows the following coordinate pairs: four comma fifteen, five comma twelve, and six comma ten. Answer 1 3 thirty sixty I have been stuck on it all day. I am in urgent need of help

### Honors Biology - URGENT!!!

Without oxygen, cellular respiration grinds to a standstill, although glycolysis can continue to make some ATP anaerobically for a short time. When oxygen runs out, why does electron transport stop? Why do you thing the Krebs cycle stops?

### Literature- Urgent 2

"When the wars over the'll be traveling to mars and back." Thanks Ms. Sue.. but I have no idea what it means?.. Maybe it means that they'll grow up soon and will be experiencing the strange feeling of not being scared abotu the beast anymore.. If anyone has read the book Lord ...

### Physics Help Please!!!! Urgent!!

In an experiment, a boar (2600 kg) slows down from 11 m/s to 8 m/s in 5 sec when the engine is stopped. a) Determine the drag force. b) Using this information, what is a good approximation of the forward thrust force needed to keep the boat cruising at a constant speed of 9 to...

### Plzzzzz help urgent math

A 4.5 m long pipe rests against a 2 m high tank, one end of the pipe is on the ground 3 m from the base of the tank. How much of the pipe overhangs the tank?

### Calc 2 Urgent Surface Area

Find the area of the surface generated when y=4x and x=1 is revolved about the y-axis. We have to use the surface area formula.

### MATH URGENT

AN INTEGER IS RANDOMLY SELECTED AND PERMANENTLY REMOVED FROM THE SET OF 100 INTEGERS (1,2,3,...100). WHAT IS THE MINIMUM NUMBER OF TIMES THIS REMOVAL PROCEDURE WILL HAVE TO BE DONE TO GUARANTEE THAT AN INTEGER HAS BEEN REMOVED?

### math help please urgent

the difference of two numbers is 27. the first number is equal to one more than twice the value of the second number. find both numbers. please show work.

### Physics Urgent please help

In addition to the Mg nucleus at x = 3 cm, another 3e charge is situated on the y-axis,3cm away from the origin in the +y direction.What is the magnitude of the Electric Field halfway between the Magnesium nucleus and the 3e charge on the y axis in N/C ?

### Urgent Math

The price of oil decreased from $54 per barrel to $50 per barrel. What is the percent decrease in oil prices?

### Chemistry URGENT

A student heated a hydrated salt sample with an initial mass of 4.8702 g, After the first heating, the mass had decreased to 3.0662 g (two part question) 1. if the sample was heated to constant weight after reheating, what is the minimum mass that the sample can have after the...

### Algebra 2 URGENT

Solve the problem. Round answer to the nearest hundredth. Please Show All Work! Suppose a pool has dimensions 12 ft. by 30 ft. A sidewalk of uniform width around the pool has an area of 200 square feet. What is the width of the walkway?

### maths urgent please

Hi, a particle is moving in simple harmonic motion such that a = -4x. ( x in metres, t in seconds) Find the maximum speed at which the particle is travelling. Velocity = 6cos2t. My teacher said to put t = 0 and sub it into velocity equation above, but I don't know why? Thanks!

### Calculus URGENT

Find the number c that satisfies the conclusion of the Mean Value Theorem on the given interval. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) f(x) = √x [0, 9] c=? I've tried quite a few different answers

### Rather Urgent math~!

1) 2(3x+5)=46 (1point) 4 5 6 7*** 2) 1/2x + 1/4x = 16 (1point) 16 21.3*** 32 64 3) 6-x-x=18 (1point) -6 6 9*** -9 4) 4x – 3/5 = 2/5 (1point) 1/5*** 5/5 1/2 1/4 Am I correct???

### urgent math

1. Simplify the expression 7^9/7^3 a.7^3*** b.7^6 c.7^12 d.1^6 2. Simplify the expression z^8/z^12 a.z^20 b.z^4 c.1/z^-4 d.1/z^4 3. Simplify the expression (-3^4)/(-3^4 a.(-3)^1 b.0 c.1 d.(-3)^8 4.Which expressions can be rewritten as 1 over the base raised to a positive ...

### CALCULUS-URGENT- no one will respond!!!

find the radius and interval of convergence for the series the series from n=1 to infinity of ((-1)^(n+1)*x^n)/n! I did the ratio test so I had the Lim as n approaches infinity of -x/(n+1), but this is 0, giving no radius, so I think I did something wrong...

### Assembling an icosahedron--URGENT!

I have to create an icosahedron and I need to know if the top of it needs to have the flaps IN? I put them OUT, and the glue is drying, so can anyone please tell me which way the flaps go? Does it even matter? pleeease help, thanks

### History (urgent!!)

Hi! I was wondering if anyone could give me specific links to information about Medieval princess/nobility dress...I need to draw a picture and write specific facts about certain parts of the dress. Thanks (:

### MATH VERY URGENT!!!!!!

1) A ball is hit at an angle of 36 degrees to the horizontal from 14 feet above the ground. If it hits the ground 26 feet away (in horizontal distance), what was the initial velocity? Assume there is no air resistance.

### Science URGENT!

I relly need help on these questions please help me :) 1. would karyotypes from the same family look similar? Explain. 2. Provide one reason as to why it would be useful to compare karyotypes of family members. 3.

### Physics -URGENT-

A 2 kg mass accelerates at 5.7 m/s 2 in a direction 19◦ north of east. One of the two forces acting on the mass has a magnitude of 17.1 N and is directed north. Determine the magnitude of the second force. Answer in units of N

### math(urgent)

$1000 was invested for two years at 10% simple interest .calculate the effective rate was earned. pls check my solve (1+0.1/2)^2-1 = 0.1025 but the true answer is 9.54% pls help me to get the formula of effective rate

### math

A girl starts from point A and walks 285m to B on a bearing of 078.She then walks due south to a point C which is 307m from A. What is the bearing of A from C,and what is {BC}? please i need the answer urgent ooo it is an assignment pls help me fast

### Pre-Algebra[URGENT]

Need help on solving this one as well- A local telephone company charges $9.75 per month for basic service and $0.20 for each call made. You are allowed to spend more than $17.00 but less than $21.50 a month. What are the most calls you can make and remain within your budget? ...

### English (Urgent)

Hi I'm writing an essay about No-No Boy. Does the following sentence sound alright, if not how do I make it sound better. I need help soon please! Two significant problems in this novel for him is overcoming self blame along with dealing with culturally assimilating himself to...

### MATHS URGENT

The values for x when f(x) = 0 are: x=-2 and x=3 My question is: The function f(x) can be written in the form of a(x-p)(x-q)(x-r) Write down one possible set of values for p, q, and r? Now Ive got the correct answer x = -3, 2 and 2 Could you show me step-by step how to end up ...

### CHEM PLZ URGENT!!

19. A block of aluminum has a volume of 126.5 cm3. Its density = 2.70 g/cm3. What is the mass of the aluminum? A) 342 g B) 46.9 g C) 127 g D) 0.0213 g E) 124 g The answer is A.....But I still can't figure it out....I keep getting D as an answer..

### Urgent math question for Reiny

Find the value of the expression below for r=4 and t=2.... t^3-r+20 divided by r 9*** 72 6 40 Ok, Reiny you said my answer9 was originally wrong, however when I looked at the work you did and you put in parenthesis()....my question is why, because the original expression didn'...

### math(urgent)

At the end of every year for 3 years, RM1000 will be invested in an account that offers 8% compounded annualy.Find the account amount at the end of the 3 years. the answer is $ 3246.40 in my calculation i solve 1000(1+o.08/1)^(3-1) =11664

### math urgent help needed

the question is: -3x-2z-7 if x=3 and z= -1 i did the the question and got the answer - 14 ....but the answer key that i got say -20....can anyone help me... with this plz....

### maths-urgent

Rudransh has a piece of cardboard in shape of a quadrilateral. He cuts it into two triangles such that angles formed at the vertices are bisected. He wants to find out whether the two triangles are congruent or not without actually super positioning them on one another.

### BIOLOGY - HELP URGENT!!!!

How do the following terms relate to one another with respect to a single genetic locus? - Wild Type Allele(s) - Mutant Allele(s) - Gene Product(s) - Population - Genotype - Phenotype - Dominant Allele - Recessive Allele - Individual - Number of different alleles

### Physics 11 damon pls URGENT!

The coefficiant of friction between rubber tires and wet pavement is 0.5, and the breaks are applied to 750kg car, intitally travelling at 30m/s and the car skids to a stop. What is size and difection of the acceleration. How do i find acceleration of the vehicle

### Urgent Science~!

Carla applied a force of 35 N to a wheelbarrow full of bricks and moved it 2.5 m. Which of the following can be determined from this information? The wheelbarrow supplied 87.5 J of work. The wheelbarrow has a mechanical advantage of 14.*** The wheelbarrow is 7 percent ...

### math urgent

which property is illustrated by the equation? commutative property of addition distrubutive property additive inerse property additive identity property

### math urgent

which property is illustrated by the equation 3/2x+0=3/2x? commutative property of addition distrubutive property additive inerse property additive identity property

### URGENT Needs Physics Help

Ok, so I am doing this paper on the physics mistakes in Willy Wonka and the Chocolate factory. To prove that the everlasting gobstopper defies the laws of physics, I wanted to use Zeno's paradoxes to do so. But are his paradoxes correct? There are theories online that say they...

### Urgent Needs Physics Help

Ok, so I am doing this paper on the physics mistakes in Willy Wonka and the Chocolate factory. To prove that the everlasting gobstopper defies the laws of physics, I wanted to use Zeno's paradoxes to do so. But are his paradoxes correct? There are theories online that say they...

### Urgent Science Question!

A 921kg sports car is moving rightward with a speed of 29.0m/s. The driver suddenly slams on the brakes, causing a 8347N resistive net force and the car skids to a stop. Determine the time it takes to stop the car.

### art urgent

achile de gas in the uniform of a cadet by edgar degas how was proportion used in this image to create a mood of tranquility to create an optical illusion to create a sense of perspective in the image to make sure the person was drawn correctly

### Physics URGENT!!!

At a certain location, the horizontal component of the earth's magnetic field is 2.5 x 10^-5 T, due north. A proton moves eastward with just the right speed, so the magnetic force on it balances its weight. Find the speed of the proton.

### math/algebra

if a doctor prescribes 30 units of insulin in 500 ml to be administered over 2 hours, how many drops per minute should be administered if the set is calibrated to deliver 20 drops per ml? i don't know how to get it and i need to show work... this is urgent

### 5th grade math urgent

Okay look: 00-01-$7586 01-02-$8022 02-03-$8502 03-04-$9249 04-05-$9877 Jason started college during the 2001-2002 year and graduated during the 04-05 year. How much did Jason's education cost? How do you do it????

### ALGEBRA/ URGENT

Doing something wrong. Write an equation of the line containing the given point and perpendicular to the given line. (4,5;)4x+y=8; I tried this. y = -4x+8. The slope is the reciprocal of -4 so 1/4. Then (y - y^1=m(x-x^1). y -4 = 1/4(x-4). I then multiplied 1/4 and 4 then added...

### Physics

VERY URGENT- A kicked ball takes off at 25m/s at an angle with the ground. If the goal is 50m away and the horizontal bar is 3.44m above the ground, what must be the elevation angle for the kicker to score a goal?

### Calculus Help Please Urgent!!!

find the limit algebraically. Use L'Hospital's Rule where appropriate. If there is a moare elementary method, consider using it. If L'Hospital's Rule doesn't apply, explain why lim -> 0 (cot(x)-(1/x)) show work please!!!

### CHEMISTRY: URGENT DRBob222

A mixture of 0.50 mol of ethanoic acid and 1.00 mol of ethanol was shaken for a long time to reach equilibrium. The whole mixture was titrated quickly with 1.00 mol dm3 sodium hydroxide and 80cm3 of alkali were required. 1. Write an equation for the reaction between ethanoic ...

### Urgent math

i need help with these two homework problems Use the Laws of Logarithms to combine the expression into a single logarithm log2 5 − 5 log2 x + 1/2 log2(x + 1) Solve the logarithmic equation for x log2(x + 2) + log2(x − 1) = 2

### english-URGENT NEED OF HELP!

I need the format of a business letter, and a friendly letter! P.S: also need the spacings if they are any. I mean like the spacings(No. of lines) between ______ and _______.

### Math (repost, URGENT)

A curve is traced by a point P(x,y) which moves such that its distance from the point A(-1,1) is three times the distance from the point B(2,-1). Find the equation of the curve and identity.

### Math- urgent

One more than 3 times a number is the same as 5 times the number, decreased by 15. Find the number. • Assign the variable • Write an equation • Solve equation

### Differential equation (urgent pls!!!)

Reduce the differential equation below to an exact equation (X - 2siny + 3)dx -(4siny - 2x + 3)dy=0. The problem here is how to solve for the integrating factor...any help pls?

### physics

two planets of mass "m" and "M" respectively. Have centre to centre seperation of "R" . At what distance from the centre of the planet of mass "M" do the gravitational force of planets cancel each other??????? plz urgent help me?

### Algebra Help URGENT Please?

Jamie is a salesperson in a shoe store and earns $95 per week, plus 20% of her weekly sales. If Jamie makes $475 in one week, what are her sales for that week?

### Physics Help Please --- Urgent

A thin converging lens is found to form an image of a distant building 24 cm from the lens. If an insect is now placed 16 cm from this lens, how far FROM THE INSECT will its image be formed? A) 64 cm B) 72 cm C) 32 cm D) 96 cm E) 48 cm

### Accounts (URGENT)

If in the asserts-liability statement the value of the closing stock is $1580 and then there is an additional note which says: Stock valued at $4240 had been discarded during the year as it had deteriorated and could not be sold How will I account for it? Can someone help me ...

### science

i need to solve this : 1. we should show the chemical structure of oligosaccharide which contains 2 galactoses and 1 saccharose. 2. compare the difference in physical features og dicarboxylic acids and glucose beta chain 3. determine the calorific value of 5g saccharose please...

### Maths SUPER URGENT

Hey What size down pipe would I need, and how many if my roof area equals 1224.78 metres squared and I have average rainfall of 173kl per year? Also how much plumbing would I need from my hypothetical tanks?

### VERY URGENT Language arts

“First of all I dismembered the corpse. I cut off the head and the arms and the legs? What kind of context clues helps you determine the meaning of dismembered? Characteristics Contrasting words Examples Explanatory words and phrases*** Am I correct?

### Urgent--Spanish help! :(

6. Which Spanish city is known for the fact that people of three different religions peacefully lived there together? Avila Madrid Segovia Toledo 7. How would you express your agreement with the following statement? No me gusta equiar. Pues, me gusta esquiar. A mí también. S...

### Urgent Math

f(x)=(x+2)^3-4. The point (-2, -4) is which of the following? A) An absolute maximum B) An absolute minimum C) A critical point but not an extremum. D) Not a critical point E) None of these I think the answer is C, am I right?

### URGENT SUMMER SCHOOL CALCULUS

A force of magnitude 15 N is the resultant of two forces, one of which has a magnitude of 8 N and acts at an angle of 30° to the resultant. Find the magnitude and direction of the other force...how do I begin to solve this!?

### Drug Abuse (URGENT)

What are some non physical effects of marijuana use? I've found lots of physical but I can't seem to find any non physical effects. Can someone help me please. Thanks very much.

### chem help urgent!

i only have one submission for these and i dont' really know how to tell which one has the higher boiling point. can you help? Of each pair of solids, which one has the higher melting point? Kr(s) or Cu(s) and.. CCl4(s) or SiCl4(s)

### chemistry

URGENT!! You wish to prepare 1 L of a 0.02 M potassium iodate solution. You require that the final concentration be within 1% of 0.02 M and that the concentration must be known accurately to the fourth decimal place. How would you prepare this solution? Specify the glassware ...

### CALC urgent please

A boat crosses a river and arrives at a point on the opposite bank directly across from its starting position. The boat travels at 4 m/s and the current is 2m/s. If the river is 600 m wide in what direction must the boat steer and how long will it take to cross?

### Physics - URGENT

A ball is thrown horizontally of a cliff. If the initial speed of the ball is 17 m/s and the cliff is 77 m high, how far from the base of the cliff will the ball land in the water below? Calculate the answer in meters (m) and rounded to three significant figures.

### Math(Urgent)

Compute the maximum product for two positive numbers x and y with the property that the sum of the first plus five times the second is 5000. 1) Indicate the objective equation 2) Indicate the constraint equation I put x+5y=5000. Is this correct.

### math urgent!

Tyler is on the 15th floor of a building. She throws a ball straight down from the window, which is 220 feet above the ground. How fast must she throw the ball(in feet per second) for it to hit the ground in 3 seconds?

### Math Urgent

Two surveyors with two-way radios leave the same point at 9:00am., one walking due south at 2 mi/hr and the other due west at 5 mi/hr. How long can they communicate with one another if each radio has a maximum range of 10 miles?

### MATH URGENT!!!!!!!

the will of an eccentric millionaire reads as follows: "i leave 4/17 of my estate to my son, 7/13 of the remainder to my wife, 2/3 of this remainder to my daughter, and the remaining $2million to my dog." what was the total amount of the estate? please answer and show step by ...

### Urgent help here! Math

Solve for the area when a rectangle of length 4cm and width 3cm has one vertex at the origin of a system of axes and another vertex on a quarter of a circle whose center is also at the origin. Find the shaded area?

### business/math

please answer:a portfolio had an original value of $8500 eight years ag.the current value of the portfolio is $45389.what is the average geometric return on this portfolio? urgent response need please

### Math -urgent :)

Hello A straight line passes through the point (1,27) and intersects the positive x-axis at the point A and the positive y-axis at the point B.Find the shortest possible distance between A and B.. Pleaase could you help me? Thank you in advance

### Urgent math question help!!!

Drag and drop the correct justifications into the boxes. 4(x−2)+1=9 : subtraction property of equality 4x−8+1=9 :combine like terms 4x−7=9 : distributive property 4x = 16 : associative property of equality x = 4 : division property of equality

### math help urgent

what di di do wrong in this??? the question is: x-8y=18 -16x+16y=-8 i did : first multiplied the first equation with 2 then 2x-16y=36 -16+16y=-8 ----------- -14x=28 x=28/-14 x=-2 now x-8y=18 (-2)-8y=18 -8y=18+2 -8y=20 y=20/-8 y= 2.5 plz help me what did i do wrong??

### Urgent Chemistry

The Heisenberg Uncertainty Principle: A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of mm = 0.100fg\rm fg (where a femtogram, fg\rm fg, is 10−15g\rm 10^{-15}\; g) and is swimming at a velocity of vv = 7.00ìm/s\mu m/s , ...

### pleaseeee....it's urgent!

1.State the name of the removable disk which was invented in 1962. 2.Who invented the removable disk?

### Algebra 2 URGENT

simplify: x+2 __ x to the second power + x-2 _____ 2x X+2 divided by x to the second power plus x-2 divided by 2x

### Science URGENT

Is there any website or any way I can get the science probe 10 check your understanding answers cause I want to check my answers?

### Calculus - URGENT EXAM

I HAVE AN EXAM REVIEW QUESTION AND I REALLY NEED HELP. An airplane has an air speed of 330km/h and is heading in a direction of N30E when it encounters a wind from the north. The resultant ground velocity has a direction of N40E. How long does it take for the plane to travel ...

### HCS/325 Health care management

In the rolee of a health care manager, you are expected to respond to daily urgent and emergency situatuions as they arise by mobilizing your staff and available resources to attain specific objectives. How would you describe the finction of control involved here?

### URGENT PHYSICS

A hammer thrower accelerates the hammer (mass = 7.30 kg) from rest within four full turns (revolutions) and releases it at a speed of 21.0 m/s. Assuming a uniform rate of increase in angular velocity and a radius of 0.80 m, calculate the angle of this force with respect to the...

### MATH SUPER URGENT!

Alfonse cuts half a rectangular lawn, 50m by 20m, by mowing strips of equal width around the perimeter. Bart cuts the small rectangle in the middle that's left. How wide a strip does Alfonse cut so that they share the work equally?

### Physics Urgent!

A snowboarder of mass 60 kg is at rest on the top of a sand dune. The coefficients of static and kinetic friction are 0.55 and 0.4675, respectively. 60 kg μk = 0.4675 μs = 0.55 What is the angle the incline must exceed so that the snowboarder starts sliding? The ...

### Chemistry - Urgent Please help!!

The problems: 0.0513 grams of Al (Wt. 27.0) was reacted with excess HCI to produce H2 according to the following balanced equation: 2 Al + 6 HCI ---> 2 AlCl3 + 3 H2 a) Determine the number of moles of H2 evolved from that quantity of Al when collected over water? 0.0513g Al...

### Physics URGENT!!!

Two packing crates of masses 7.93 kg and 5.13 kg are connected by a light string that passes over a frictionless pulley as in the figure below. The 5.13 kg crate lies on a smooth incline of angle 40.0°. a) Find the acceleration of the 5.13 kg crate (b) find the tension in the...

### Physics URGENT!!!

Two packing crates of masses 7.93 kg and 5.13 kg are connected by a light string that passes over a frictionless pulley as in the figure below. The 5.13 kg crate lies on a smooth incline of angle 40.0°. a) Find the acceleration of the 5.13 kg crate B)Find the tension in the ...

### math URGENT!!!!!!

a 12x12-inch square is divided into n^2 congruent squares by equally spaced lines parallel to its sides. circles are inscribed in each of the squares. find the sum of the areas of the circles... please answer and explain how you got this answer!!!

### Math urgent help please!!

You have 500 cm² of material available to cover different shapes. what is the maximum volume of each object that you could make with this amount of material? A.) a cube B.) a sphere I've been stuck on this for so long, please show me how to do this step by step, thanks :)