Monday

May 4, 2015

May 4, 2015

Total # Posts: 364

**Chemistry**

Hi, Iodine has 53 electrons and configuration of: 2, 8, 18, 18, 7. Why does the fourth shell not reach maximum and therefore it picks up 7 electrons and begins a new shell. Thank you.
*April 27, 2015*

**Chemistry**

Why is Potassium and Bromide KBr? Why does Br not follow 2n2? Br = 35 electrons, 2,8,18,7 why does the shell not fill to 32 and is happy with one of Potassium electrons. Thank you kindly.
*April 19, 2015*

**Chem 12**

0.300 mol of S2 and 0.310 mol of C are placed in a 1.00 L flask and allowed to reach equilibrium according to this reaction: S2(g) + C(s) ⇔ CS2(g) At equilibrium, 0.271 mol of CS2 is present. The value of Keq for the reaction is ---- a)9.3 b)0.91 c)240 d)2.9 Not too ...
*April 4, 2015*

**math**

Vanilla Box Company is going to make open-topped boxes out of 17 × 13-inch rectangles of cardboard by cutting squares out of the corners and folding up the sides. What is the largest volume box it can make this way? (Round your answer to one decimal place.)
*March 30, 2015*

**Arithmetic Progressions **

The second term of an arithmetic progression I four times the fits term, and the first term is ten. Find the common difference and hence find the sum of the first 12 terms.
*March 10, 2015*

**chem**

Write the equilibrium expression for the following: 2NOCl (g) ==== 2 NO + Cl2 (g)
*March 1, 2015*

**chem**

The solution of known concentration to use to evaluate Z was prepared as follows: 2.00mL of 0.00201 M KSCN and 18.0 ml 0.200 M Fe (NO3)3. Assume that all of the SCN- has been converted to Fe(SCN)2t in this solution. Fe3+ SCN- ==== Fe Fe(SCN)2+ I don't really know how to do...
*March 1, 2015*

**physics**

What is the relationship between the coefficient of friction and the time that it takes the object to reach the bottom of the ramp?
*February 25, 2015*

**chem II**

0.959 g of a hydrocarbon is dissolved in 10.00g of benzene. The freezing point of the solution is 1.16C. Find the molecular mass of the hydrocarbon. Benzene has a Kf of 5.12 and a freezing points of 5.53 degrees C. Not sure how to go about solving this problem? Thanks!
*February 8, 2015*

**chemistry**

4. A sulfuric acid solution containing 571.6 g of H2SO4 per liter of solution has a density of 1.329 g/cm3 . Calculate a. The mass percentage b. The mole fraction c. The molality d. The molarity of H2SO4 in this solution
*February 5, 2015*

**chemistry II**

What is the molarity of a solution of acetic acid if 35.00mL is titrated to the end point with 68.20ml of 0.750M KOH? What is the percentage by mass of acetic acid solution? The density of acetic acid is 1.06 g/ml
*February 1, 2015*

**chemistry**

In an acid-base titration, 33.12ml of 0.1177 M H2C2O4 was titrated with 0.2146 M NaOH to the end point. What volume of the NaOH solution was used?
*February 1, 2015*

**science**

Calculate the molarity of a solution which contains 6.456g of Na2CO3 dissolved in 250.0 ml of solution.
*February 1, 2015*

**statistics help please**

The employment percentages for men versus women in a computer company last year were 80% and 40%, respectively. At the beginning of this year, they had 150 men and 60 women currently hired. The owner of the company wishes to check their hiring practices and ensure that the ...
*January 23, 2015*

**Algebra 1 please help**

There are 15 violinists in the orchestra this year. Next year, two violinists will leave and some new violinists will join the orchestra. If v is the number of violinists who will join the orchestra, write an expression to represent the number of violinists in the orchestra ...
*January 14, 2015*

**Algebra**

Mrs. Delgado has some young orange trees. He wants to plant them in 46 rows. If t is the total number of orange trees, write an algebraic expression to represent how many trees he can plant in each row. Please help write the expression. Thanks.
*January 14, 2015*

**Science please help thx**

Convection cells are created by very hot material deep in the mantle rising, then cooling, sinking again and repeating the cycle. This process occurs because of the uneven distribution of ? Within the earth? Please fill in the question mark with a answer. a. Crystal plates B. ...
*January 12, 2015*

**Science please help**

Some of the water flows over the dam and is converted to energy, some water evaporates into the air. What spheres does the water, or hydrosphere interact with this example? a. Geosphere and atmosphere B. Atmosphere and biosphere C. Crysophere and atmosphere D. Asthenosphere ...
*January 12, 2015*

**Science**

What is the main method of heat transfer from the core to the crust of earth? A. Conduction B. Convection C. Radiation
*January 12, 2015*

**Math 1 please help**

A clothing store has the sign shown in the shop window. Pani sees the sign and wants to buy 3 shirts and 2 pairs of jeans. The cost of each shirt before the discount is $12 and the cost of each pair of jeans is $19 before the discount. Question 1. Pani says she should get a $3...
*January 8, 2015*

**Physics**

How much force is required to accelerate a 1500kg car to a speed of 17m/s in a distance of 45m? Thank you.
*January 3, 2015*

**Physics**

Thank you kindly.
*January 3, 2015*

**Physics**

A mass of 25kg is acted on by a force of 56N. If a friction force of 12N exists, find the acceleration of the mass. I have worked the following: a=F/M = 44/25 = 1.76 m/s2 Am I correct? Thank you.
*January 3, 2015*

**Physics**

Thank you. Can you explain d=1/2 a t^2. What does the ^ mean?
*January 1, 2015*

**Physics**

A force of 270N acts on a mass of 13.5kg for 13sec. Calculate a) the acceleration b) the final velocity c) the distance covered. a)F=m*a, so 270=13.5*a/13, answer 260m/s b)Not sure which formula. c)Formula d=v*t, once velocity is worked out in question b). I am not sure with a...
*January 1, 2015*

**Physics**

A 6kg mass is acted on by a force for 60sec and acquires a speed of 10m/s. What is the value of the force? I have calculated this as below: F = ma Therefore F = 6*10/60 F=1N Am I on the correct path? Thank you kindly
*January 1, 2015*

**Physics**

What force is required to give a 1kg body a velocity of 5m/s after acting for 5sec? I know I can use F=mxa What do I do with the 5sec? Thanks
*January 1, 2015*

**Algebra 2**

Can someone please help me do the follow problem... ...The cost (in dollars) of producing x sneakers in a factory is given by c(x)=60x+750. The number of sneakers produced in (t) hours is given by x(t)=50t. Fund c(x(t)). Evaluate c(x(5)) and explain what this number represents.
*December 16, 2014*

**Algebra ASAP thx**

Tim is reading a book. On Monday he reads 3 pages. On each day after that, he reads 3 times the number of pages that he read on the previous day. How many pages does he read on Thursday?
*December 15, 2014*

**Algebra please help answer**

A certain colony of bacteria triples in length every 10 minutes. It's length is now 1 millimeter. How long will it be in 40 minutes? Please help answer thx
*December 15, 2014*

**Algebra**

Divide
*December 10, 2014*

**Algebra**

How many 0.6 liter glasses can you fill up with a 4.5 liter pitcher?
*December 10, 2014*

**Algebra**

Barbara can walk 3200 meters in 24 minutes. How far can she walk in 3 minutes?
*December 10, 2014*

**Calculus**

a particle moves along the x-axis at a velocity of v(t)=1 sqrt(t), t>0. at time t=1 , its position is x=4. find the acceleration and position functions for the particle
*December 4, 2014*

**Science **

Polysaccharides break apart by the process of hydrolysis and need _________ for this process. Can you please help me fill in the blank.
*December 3, 2014*

**Algebra please help**

1 hour= 3,600 seconds and 1 mile=5,280 feet. Make a conjecture about how you would convert a speed of 15 miles per hour to feet per second. Then convert. Please help answer thx
*November 20, 2014*

**Algebra**

Would you divide 5280 by 3600
*November 19, 2014*

**Algebra**

One hour = 3,600 seconds and 1 mile= 5,280 feet. MAke a conjecture about how you could convert a speed of 15 miles per hour to feet per second. Then convert please help answer
*November 19, 2014*

**Algebra**

What is the result if you multiply a number of cups by 8 fl oz/ 1 cup and then multiply the result by 1 cup/ 8 fl oz? Give an example thx
*November 19, 2014*

**Math please help out **

What are the dimensions of a football field in feet? If one side is 53 1/3 yards and the other is 120 yards? Please help answer B. A chalk line is placed around the perimeter of the football field. What is the length of this line in feet? C. About how many laps around the ...
*November 19, 2014*

**Algebra help**

Can you help answer these questions? Thanks ASAP
*November 19, 2014*

**Algebra please help out**

How would you convert 5 feet 6 inches to inches?
*November 19, 2014*

**Algebra please help out**

In Beijing in 2008, the women's 3,000 meter steeplechase became an Olympic event. What is this distance in kilometers? Please help answer thx
*November 19, 2014*

**Algebra please help out **

If the number in the numerator of a unit rate is 1, what does this indicate about the equivalent unit rates? Please help answer and give an example. Thanks
*November 18, 2014*

**chemistry**

You perform the following titration: You placed 35 mL of H2S in a flask and placed it under a buret. The buret contains 0.243M Sr(OH)2 and you are going to titrate the H2S with the base. You titrate until the color changes. At that point, you record that you used 10.15mL of ...
*November 14, 2014*

**Algebra 2**

(192x^2y+72x^3)-(24rxy-9rx^2) I need help factoring completely in groups and can you please show all your work thank you
*November 6, 2014*

**Math**

Solve 2x^3y^-3*2x^-1y^-3
*October 23, 2014*

**Math**

Thank you so much
*October 21, 2014*

**Math**

Or simplify down to the very end
*October 21, 2014*

**Math**

I need to solve it
*October 21, 2014*

**Math**

((1/2)^-5)^2
*October 21, 2014*

**Math**

How do you solve the equation by completing the square X^2+4x=10
*October 4, 2014*

**Algebra**

How do you solve the equation by completing the square X^2+4x=10
*October 4, 2014*

**Math**

Posted by NEED HELP on Monday, September 29, 2014 at 9:12pm. Have three problems and I'm really confused how to solve/simplify 1. 4/3+square root of 5 2. -4/-4+4square root of 2 3. 1/1+ square root of 2
*September 29, 2014*

**physics**

The distance each floor of the office building is 3.0 m. Which table shows the total distance traveled and displacement of the elevator?
*September 18, 2014*

**physics**

A 1.8-kg object moves in the x direction according to the following function: x(t) = 2t2 + 3t − 5 (SI units). What is the force on the object after 2.7 s?
*September 10, 2014*

**PreCalculus**

For the function f ( x ) =3x+2/5 , find the difference quotient f(a+h)-f(a)/H
*March 25, 2014*

**business management**

how can an organisations strategic and business plan influence staff recruitment, selection and induction?
*March 19, 2014*

**chemistry**

A sample of gas has a mass of 0.565g . Its volume is 120 mL at a temperature of 80∘C and a pressure of 747 mmHg . what is the molar mass
*March 9, 2014*

**Physics**

A driver in a car traveling at a speed of 72 km/h sees a cat 107 m away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 104 m?
*March 2, 2014*

**Physics**

A person looking out the window of a stationary train notices that raindrops are falling vertically down at a speed of 3.6 m/s relative to the ground. When the train moves at a constant velocity, the raindrops make an angle of 60° when they move past the window, as the ...
*February 16, 2014*

**Maths**

Thanks! :)
*February 3, 2014*

**Maths**

£2000 is invested at x% interest over three years. At the end of three years the money has grown to £2963. To the nearest percentage find the rate of interest. If you could help me out I would greatly appreciate it. I've tried to figure it out numerous ways and...
*February 3, 2014*

**Science**

Thank you guys, I hope you all were right on the answers.
*January 13, 2014*

**Bus 311**

Answer to question 1 is correct. Answer to question 2 is wrong. The correct answer is Yes, Industrial was merely attempting to negotiate. Answer can be verified in the class online text Ch 4.2 The Offer
*January 9, 2014*

**MATH.**

6. Combination of 9 pick 6 This seems easy but I am not sure how to set the problem up. Thanks!
*December 4, 2013*

**MATH ***

0=-16t^2+80t+96 Solve for t. Can someone please show me the steps on how to do this I can not seem to get it right. Thanks!!
*December 2, 2013*

**-MATH-**

h=-16t2+80t+96 Use this position polynomial to calculate the following: 1.The height of the object after 2 seconds 2.The height of the object after 4 seconds 3.How long the object will take to reach the ground? 4.Write the position function for an object that is thrown upward ...
*December 2, 2013*

**Math :)**

Im not sure what you mean by that??
*December 2, 2013*

**spanish**

Oh, when I said *this*, I meant that any words within the asterisks were required in the sentence. Sorry about that. Thanks for the help!
*December 1, 2013*

**spanish**

Could someone please proofread these sentences and correct any grammar/word use mistakes? I'm in Spanish III so these sentences aren't that complex. I need to use any words like *this*. Thanks! 1. Las flores rojas son bonitas. 2. El niño guapo es tímido. ...
*December 1, 2013*

**business math**

280800
*November 9, 2013*

**Calc**

A cardboard box manufacturer makes open boxes from rectangular pieces of cardboard of size 30cm by 40cm by cutting squares from the four corners and turning up the sides. A) find a mathematical model expressing the volume of the box as a function of the length of the side of ...
*September 25, 2013*

**5th grade Math**

which statement is true and how?
*September 23, 2013*

**5th grade Math**

The school received 14 rolls of free movie tickets from a local theater. There are 48 tickets in each roll. The school has 32 classes of 24 students each. If the school plans to give one ticket to each student, which of the following statements is true? A. The school will have...
*September 23, 2013*

**physics**

A lightbulb emits light that creates a shadow of a ball on a wall. If the radius of the ball is 12.3 cm, and the radius of the shadow is 29.5 cm, and the ball is 1.27 m away from the wall, how far is the lightbulb away from the wall? (For the present problem, you may assume ...
*September 14, 2013*

**physics**

A pair of vertical plane mirrors stands with an angle of β = 56.5 degrees between them. A pencil of light approaches in a direction parallel to one of them, as shown. After the pencil has left the mirrors, in which direction will it be going? (Give your answer as the ...
*September 14, 2013*

**probability **

What is the probability that an 8 digit numbers contains "97"?
*June 20, 2013*

**chemistry**

0.29
*May 27, 2013*

**Math**

13
*May 16, 2013*

**accounting**

Easy Move Company made the following expenditures on one of its delivery trucks:Feb. 4.Replaced transmission at a cost of $4,625.May. 6.Paid $1,615 for installation of a hydraulic lift.Sept. 10.Paid $69 to change the oil and air filter.Prepare the journal entries for each ...
*April 30, 2013*

**Statistics**

Suppose x has a mound-shaped distribution with sigma = 9 . A random sample of size 36 has sample mean 20. Is it appropriate to use a normal distribution to compute a confidence interval for the population mean m? Explain. Find a 95% confidence interval for m. Explain the ...
*April 27, 2013*

**Chemistry**

An aqueous solution of NaCl freezes at -1.6ºC. At what temperature will it boil? Given that K(b) for water is 0.52 deg m^-1.
*April 17, 2013*

**Math**

3.7 x 10^7, just like what the others say
*April 10, 2013*

**Stats**

n=194 P(r >/= 50) p= .12 (converted percent to decimal) q= 1-p = 1-.12 = .88 P(x) = r-.5 if r is to the left(greater than) therefore, P(x>/= 49.5) You need P(z>/= ?) So: mean (mu) = np = (194)(.12) = 23.28 stan. dev. (sigma) = sqrt(npq) = (194)(.12)(.88) = 4.526 z= (x...
*March 27, 2013*

**Algebra**

Area of rectangle is 40m squared it has a length that is 2m less than 3 times its width what are the dimensions of retangle
*March 21, 2013*

**english**

Thanks
*March 14, 2013*

**english**

I wrote, Ms.Marcus is tall and a little bit skinny. What are the two sound effects in the line above? Which words are involved in each sound effect. Please help I'm not good with English class thanks :)
*March 14, 2013*

**math**

Thanks
*March 13, 2013*

**math**

The length of a rectangle is 5cm more than twice the width. The perimeter of the rectangle is 34 cm. Find the dimensions of the rectangle. So confused on how to do this problem please help me thanks.
*March 13, 2013*

**math**

The length of a rectangle is 5cm more than twice the width. The perimeter of the rectangle is 34 cm. Find the dimensions of the rectangle. So confused on how to do this problem please help me thanks.
*March 13, 2013*

**Math**

Show that cos x +cos(x+60)=3/5[1+root 3]
*February 20, 2013*

**Accounting**

What is "loss of lawsuit" categorized as? Current/non-current assets, current/non-current liabilities, owners' equity, expenses or revenues?
*February 5, 2013*

**math**

It sure did! Thank you! :)
*February 3, 2013*

**math**

In rhombus ABCD, diagonals AC and BD are drawn. If the rhombus is graphed on a coordinate plane the slope of AC is 3/5. What is the slope of BD? Explain how you know.
*February 3, 2013*

**Math**

In rhombus DFGH, m<D = 51. Find the measure of <F, <G and <H.
*February 3, 2013*

**AP Physics B**

Through a pipe of diameter 15.5 cm , water is pumped from the Colorado River up to Grand Canyon Village, on the rim of the canyon. The river is at 564 m elevation and the village is at 2096 m . At what minimum pressure must the water be pumped to arrive at the village? The ...
*January 23, 2013*

**Math**

I think d am I right?
*December 13, 2012*

**Math**

Merchandise inventory purchases for a firm for a three month period are: January :2,000 units @ $12 per unit; February 1,800 @ $14 per unit; march 2,600 units @15 per unit. What is the mean unit cost of merchandise inventory? A.$12.82 B.$13.33 C.$13.78 D.$14.00
*December 13, 2012*

**ASAP CHEMISTRY**

you were right...the 500L should have been 500ml. Thanks for your help!!!
*December 13, 2012*