Tuesday

November 25, 2014

November 25, 2014

Total # Posts: 272

**Chemistry**

Hi: Thank you for helping me. I realized this after posting. I found that Hf is 5.7kj/mol and I know that the Hf known is 6.02kj/mol. 316.43*.001*18.02=5.70kj/mol I found that 5.70/6.02= 94.7% <--Can you check if I did this correctly?
*November 19, 2014*

**Chemistry**

UPDATE: I got 352.49J/g. I need help figuring Hf in (kj/mol).
*November 19, 2014*

**Chemistry**

I need help calculating Heat of fusion for a calorimeter experiment: I know that Q(melt): 8350.46 J, m(ice): 26.39g and m(hot water): 51.93g. Please help me set it up. Hf known is 6.02kj/mol. Answer is in J/g(ice).
*November 19, 2014*

**science**

I dropped marbles down from the same height for an experiment, but why don't they land in the same location?
*November 13, 2014*

**Spanish**

I want to say, I liked reuniting with my relatives, is it "me gustó reunirme con mis parientes" or is it "...reunirse con mis parientes"?
*November 11, 2014*

**Spanish **

How do I say, "I learned to bargain?" Is this correct, yo aprendí regatear?
*November 10, 2014*

**math**

where is the 36 from?
*October 18, 2014*

**math**

Question: Two physics students built a model rocket for a class project. Once the rocket is launched, its height in feet, h(t), can be found using the height function h(t) = -16t² + 96t where t represents time in seconds.Find the time when the rocket finally hits the ...
*October 18, 2014*

**math**

I'm wonder if im correct? Two physics students built a model rocket for a class project. Once the rocket is launched, its height in feet, h(t), can be found using the height function h(t) = -16t² + 96t where t represents time in seconds my work: 0=-16t^2+96t = -16t(t-...
*October 18, 2014*

**Math **

Is this right? 0 > -2
*September 10, 2014*

**Science**

A classmate states that igneous rock must always become a sedimentary rock next, according to the rock cycle. Explain why this is not correct.
*September 9, 2014*

**Math**

Ok so... -4 (2 +8) = (-4 • 2) + (-4 •N) What would N be?
*September 7, 2014*

**Engineering**

Phase diagram for soil Mechanics?
*August 29, 2014*

**Chemistry**

KNO3 solubility at 80 C is 180g/100g KNO3 solubility at 50 C is 78g/100g
*July 28, 2014*

**Chemistry**

100g of a saturated solution of KNO3 was cooled from 80 degrees to 50 degrees. What mass of KNO3 would be expected to crystallise out of the solution?
*July 28, 2014*

**statistics**

A graph representing the distribution of the oral temperatures of 50 healthy adult males (selected at random) would best be described as?
*June 15, 2014*

**Calculus**

In First principles there is usually a part that states as lim approaches 0. Now I came across a question where the limit was as 1 approaches 3. what should I do?
*May 20, 2014*

**Calculus**

A circular oilspill is spreading such that the radius is increasing at 0.5 metres per minute. Find the rate of increase of the are of the oil spill when the radius is 10m.
*May 20, 2014*

**Calculus**

a meteorite slams into the earths crust and penetrates d=(1200t-36000t^2)m in t seconds after impact. What is the maximum depth of penetration?
*May 20, 2014*

**Calculus**

a rectangular storage area is to be constructed along the sides of a tall building. A security fence is required along the three remaining sides of the area. What is the maximum area that can be enclosed with 1000m fencing?
*May 20, 2014*

**Calculus 1**

Ok thanks I don't quite get it but I will follow your steps and Draw the diagram :)
*May 20, 2014*

**Calculus 1**

@ Steve I don't completely understand I want to knowhow we got to that answer/
*May 20, 2014*

**Calculus 1**

a rectangular storage area is to be constructed along the sides of a tall building. A security fence is required along the three remaining sides of the area. What is the maximum area that can be enclosed with 1000m fencing?
*May 20, 2014*

**precalculus**

How many solutions will the following systems of equations have? x^2+y^2=10 x+y=4 a. infinite b. 0 c. 1 d. 2 I'm thinking A. but I just want to make sure. If you have an answer that is different could you possibly show me how you got it, it would really help me prepare for...
*May 14, 2014*

**math**

(0,0); m=2
*April 25, 2014*

**Chemistry**

A 0.160-g sample of unknown metal (X) reacts with hydrochloric acid to produce 66.5 mL of "wet" gas at 20 °C and 754 mm Hg. What is the unknown metal (X)? (The vapor pressure of water at 20 °C is 18 mm Hg. Help please?
*April 23, 2014*

**chemistry**

Helpful steps? Calculate the predicted atomic radius for potassium, K, given the atomic radius of rubidium, Rb, (0.247 nm) and cesium, Cs, (0.265 nm).
*April 23, 2014*

**Chemistry**

Help please: A 0.199-g sample of unknown metal (X) reacts with hydrochloric acid to produce 88.5 mL of "wet" gas at 20 °C and 754 mm Hg. What is the unknown metal (X)? (The vapor pressure of water at 20 °C is 18 mm Hg.) X(s) + 2 HCl(aq) → XCl2(aq) + H2(...
*April 17, 2014*

**Chemistry**

How many nonbonding electron pairs are in an oxygen molecule? I drew it but im unsure if Im correct in saying it has 2 nonbonding electron pairs.
*April 17, 2014*

**Chemistry**

corrections for the data 1.00 atm 150 mL 1.15 atm 130 mL 1.36 atm 110 mL 1.67 atm 90 mL 2.14 atm 70 mL 3.00 atm 50 mL
*April 17, 2014*

**Chemistry**

How would I graph this: (I dont understand the whole with [1/volume] (units=1/mL) on the X-axis ) According to Boyle's Law, pressure is inversely proportional to volume, so prepare a graph of the data, with [1/volume] (units=1/mL) on the X-axis and pressure (atm) on the Y-...
*April 17, 2014*

**chemistry**

A sample of hydrogen chloride gas occupies 0.550L at STP. What is the pressure in atm if the volume is 7.50×10−2L at 20∘C?
*April 14, 2014*

**Science Help PLEASE!!**

I only need #1 now. . .
*March 11, 2014*

**Science Help PLEASE!!**

1. What happens to the levels of surface water and groundwater during a drought? Surface water and groundwater levels increase during drought. Surface water and groundwater levels decrease during drought. There is no change in the levels of surface water and groundwater during...
*March 11, 2014*

**science**

Carbon dioxide is obtained from the air and changed into carbohydrates and oxygen during the process of A) fossilization. B) respiration. C) digestion. D) photosynthesis
*January 29, 2014*

**Science**

23. is invasive
*January 13, 2014*

**History**

How did issues regarding African Americans equality shaped US 1850-1920?
*December 8, 2013*

**Rounding**

37,400?
*November 3, 2013*

**Rounding**

Would the answer be 37,000 then? I under stand the concept with small numbers, but the big number is confusing me.
*November 3, 2013*

**Rounding**

I was doing a math question and I got the answer "$37,482.43" but the question says to round to the nearest dollar. What would the answer be then?
*November 3, 2013*

**world history**

Which of the following is not something Napoleon did to help France wage war and win territory? A. He relied on the mandatory military service of French citizen-soldiers. B. He improved schools and the postal service. C. He raised soldiers from conquered territories. D. He ...
*November 1, 2013*

**world history**

Which of the following is not something Napoleon did to help France wage war and win territory? A. He relied on the mandatory military service of French citizen-soldiers. B. He improved schools and the postal service. C. He raised soldiers from conquered territories. D. He ...
*November 1, 2013*

**world history**

Which of the following is not something Napoleon did to help France wage war and win territory? A. He relied on the mandatory military service of French citizen-soldiers. B. He improved schools and the postal service. C. He raised soldiers from conquered territories. D. He ...
*November 1, 2013*

**Statistics**

How did you find the 3.169, please?
*October 29, 2013*

**English**

'Self-portrait'. Describe yourself. In your description you should try to capture what makes you unique. Write about 350-500 words.
*October 29, 2013*

**Math**

S(t) = 0.05t^3 + 0.3t^2 + 2t + 8 Find S'(t)
*October 13, 2013*

**Accounting - Writing **

UOIT has recently appointed you to prepare an independent consulting report to analyze the university’s current financial position and to provide some recommendations for improvement. Before you begin your analysis, you decide to identify UOIT’s various stakeholders...
*October 2, 2013*

**ap chem**

If 26.0mL of AgNO 3 is needed to precipitate all the Cl −ions in a 0.750-mg sample of KCl (forming AgCl), what is the molarity of the AgNO 3 solution
*September 29, 2013*

**ap chem**

What volume of 0.140 M HCl is needed to neutralize 2.53g of Mg(OH)
*September 29, 2013*

**Math**

What is the inequality sign for the word about? For example, Sally had about 10 apples.
*September 29, 2013*

**Math**

An investment broker wants to invest up to $20,000. She can purchase a type A bond yielding a 10% return on the amount invested, and she can purchase a type B bond yielding a 15% return on the amount invested. She wants to invest at least as much in the type A bond as in the ...
*September 28, 2013*

**Math**

A factory manufactures two products, each requiring the use of three machines. The first machine can be used at most 70 hours; the second machine at most 40 hours; and the third machine at most 90 hours. The first product requires 2 hours on machine 1, 1 hour on machine 2, and...
*September 27, 2013*

**Math**

The equation I would use is C = 12a + 16b. Does that seem alright? And how would I form the contraints?
*September 27, 2013*

**Math**

An appliance company has a warehouse and two terminals. To minimize shipping costs, the manager must decide how many appliances should be shipped to each terminal. There is a total supply of 1200 units in the warehouse and a demand for 400 units in terminal A and 500 units in ...
*September 27, 2013*

**Math - Functions**

Is max profit 80 than? I am plugging it back into P(x) = = 50x - 1.25x^2 - 160 - 10x right?
*September 24, 2013*

**Math - Functions**

The research department in a company that manufactures AM/FM clock radios established the following cost, and revenue functions: R(x) = x(50-1.25x) C(x) = 160 + 10x where 0 < x < 20. a) Determine when R = C (to the nearest thousand units. e.g. 6.247) Quantity x = ...
*September 24, 2013*

**Math**

By the way, "blank" is where the answer is supposed to be.
*September 23, 2013*

**Math**

The research department in a company that manufactures AM/FM clock radios established the following cost, and revenue functions: R(x) = x(50-1.25x) C(x) = 160 + 10x where 0 < x < 20. a) Determine when R = C (to the nearest thousand units. e.g. 6.247) Quantity x = Blank 1...
*September 23, 2013*

**Math/Piecewise functions**

Thank you! Is there a way you could show me what the graph looks like? Or explain the lines/end axis points?
*September 22, 2013*

**Math/Piecewise functions**

and the 2nd one would be 450+0.0585(x-15,000) which I would simplify. I still need help on the last one!
*September 22, 2013*

**Math/Piecewise functions **

Write a piecewise definition for the tax due T(x) on an income of x dollars When x <= $15,000..... 3% of taxable income When $15,000 < x <= $30,000....... $450 plus 5.85% of excess over $15,000 When x > $30,000........ $1327.50 plus 6.8% of excess over $30,000 I ...
*September 22, 2013*

**Math - Compounding**

Find the value of $15,000 at the end of one year if it is invested in an account that has an interest rate of 4.50% and is compounded: a) monthly b) daily (assuming a 365-day year) c) quarterly What is the formula that should be used for these 3? I just need help getting started.
*September 22, 2013*

**physics**

An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic waves that travel 1530 m/s in seawater. How deep is the water directly below the vessel if the time delay of the echo to the ocean ﬂoor and back is 8 s? Answer in units of m 004 1.0 points Joe Go ...
*September 20, 2013*

**Science :check my answers**

Here are some questions I had for hw, I answered some of them, can someone check my answers and help me with the ones i didn't answer, thanks: 1.Which constellations are visible from Canada in all seasons? My Answer:Ursa Major, Ursa Minor, Lynx,Cephus, Cassiopia, ...
*May 30, 2013*

**LA**

my bad, it's C. i totally forgot.
*May 16, 2013*

**LA**

many lottery winners have lost their money. Its right in the title!!
*May 16, 2013*

**math**

anita earned $475.54 in 2 weeks have earned the same amount of money each hour that she worked if anita worked a total of 62 hours during those 2 weeks about how much did she earn each hour?
*May 13, 2013*

**Chemistry**

A sample of calcium carbonate that has a mass of 1.0 g is heated and completely decomposed-calculate. a) the mass of carbon dioxide produced b)the volume of carbon dioxide at SLC c)the volume of carbon dioxide at STP
*May 2, 2013*

**Life Orientation**

Critically discuss 8 ways in which hiv/aids impact within a community in South Africa
*April 10, 2013*

**Math**

The legs of an isosceles triangle measures 2x^4+2x-1 units. The perimeter of the triangle is 5x^4-2x^3+x-3 units. Write a polynomial that represents the measure of the base of the triangle.
*March 12, 2013*

**Math**

The legs of an isosceles triangle measures 2x^4+2x-1 units. The perimeter of the triangle is 5x^4-2x^3+x-3 units. Write a polynomial that represents the measure of the base of the triangle.
*March 12, 2013*

**chemistry**

What volume of oxygen would be required for the complete combustion of 23.4g of benzene, C6PO4?
*March 4, 2013*

**PRECALC**

6∑6(2^K-1) K=1
*February 20, 2013*

**geometry**

A tower casts a shadow of 64 feet. A 6 foot tall pole near the tower casts a shadow 8 feet long. How tall is the tower?
*February 19, 2013*

**Math**

Mary sells roses for $24.98 a bunch. At the end of the day she had collected $274.78. How many bunches of roses did she sell?
*February 7, 2013*

**Anatomy**

why is enzymatic catalysis essential for life? Describe in detail the mechanism for enzyme mediated anabolic and catabolic reactions. include in your answer various modes of inhibition.
*January 21, 2013*

**Math **

Huong reduced the size of a rectangle to a width of 1 inch. What is the new height if it was originally 18 inches tall and 6 inches wide?
*January 15, 2013*

**enc1101**

Correcting run-on sentences 1. I had the opening part, I remember it like it was yesterday ”good afternoon everyone and welcome to the productions of ”What's the Meaning of Life”.” 2. I looked down at my costume and I love my little tutu my mom said it ...
*January 13, 2013*

**Science**

What are thease layers of earth made of? Crust Lower mantel outer core inner Core. and asthenospher and lithosphere
*January 8, 2013*

**pharmacy informatics**

can you give me some articles?Just like this article entitled "The Right Amount of Exercise for Improved Mental Health".
*January 6, 2013*

**pharmacy informatics**

Can you please give me an article about medicine that have 3 pages?
*January 6, 2013*

**Math**

In a geometric sequence, the fourth term is -4, and the eighth term is -324. What is the tenth term?
*December 18, 2012*

**pharmaceutical chemistry**

when is a substance classified as pharmaceutical aid or necessity?PLEASE HELP ME :)THANKS A LOT.
*December 6, 2012*

**math**

That is not right the answere is 5
*November 26, 2012*

**math**

I am a fraction with a deminator of 4. I am greater than1/2 but less than 1. What fraction am i?
*November 10, 2012*

**Math**

The cake perimeter is 72 inches. The length is 2 times the width, what is the area of the cake?
*November 8, 2012*

**Calculus**

Im finding local Min and max of x^2/x-2 I know I take the derivative of the first one but how do i derive this one. And the second one especially don't know how to do.
*October 22, 2012*

**algebra**

Solve the equation for y. Then graph the equation. 5x – 4y = 12 A.y=-5/4x-3 B.y=4/5x+3 C.y=5/4x-4 D.y=-4/5x+3
*October 16, 2012*

**Physical Science**

8 letter word for a substance that can be broken down into two or more simpler substances?
*October 2, 2012*

**logic**

Can u please give me 2 own examples of contrariety,subcontrariety,subalternation,and,contradiction?PLEASE.
*September 14, 2012*

**Science**

In what ways are there three processes similar in terms of the starting materials and end products?
*August 22, 2012*

**Chemistry help!!**

What is the p total?
*July 3, 2012*

**Chemistry help!!**

Mole percent composition of earths dry atmosphere is 78% N2, 21% O2 and 1.00% Ar. Using the atmospheric pressure you recorded in the lab during this experiment (757.5 mmHg) and an ambient temperature of 25C, calculate partial pressures of these 3 gases.
*July 3, 2012*

**Chemistry....help**

If 0.500L of dry N2 was bubbles into an inverted flask through water to saturate it at 25.0C, what would be the total volume at the lab atmospheric pressure. Our pressure was : 757.5 mmHg
*July 3, 2012*

**Alegebra**

N is the number of buttons in a sewing box. N is more than 40 but less than 80. When N is divided by 5 , the remainder is 2. When N is divided by 7, the remainder is 4. What is the value of N?
*June 26, 2012*

**Physics**

(a) What is the energy of a pendulum (L = 0.9 m, m = 0.4 kg) oscillating with an amplitude of 4.3 cm? (b) The pendulum's energy loss (due to damping) is replaced in a clock by allowing a 2.3-kg mass to drop 1.0 m in 1 week. What percentage of the pendulum's energy is ...
*June 25, 2012*

**Physics plz help**

(a) What is the energy of a pendulum (L = 0.9 m, m = 0.4 kg) oscillating with an amplitude of 4.3 cm? (b) The pendulum's energy loss (due to damping) is replaced in a clock by allowing a 2.3-kg mass to drop 1.0 m in 1 week. What percentage of the pendulum's energy is ...
*June 25, 2012*

**@ elena **

In the figure the coefficient of static friction between mass (MA) and the table is 0.40, whereas the coefficient of kinetic friction is 0.28 ? part a) What minimum value of (MA) will keep the system from starting to move? part b) What value of(MA) will keep the system moving ...
*May 8, 2012*

**physics **

In the figure the coefficient of static friction between mass (MA) and the table is 0.40, whereas the coefficient of kinetic friction is 0.28 ? part a) What minimum value of (MA) will keep the system from starting to move? part b) What value of(MA) will keep the system moving...
*May 8, 2012*

**physics please help !**

In the figure the coefficient of static friction between mass (MA) and the table is 0.40, whereas the coefficient of kinetic friction is 0.28 ? part a) What minimum value of (MA) will keep the system from starting to move? part b) What value of(MA) will keep the system moving ...
*May 8, 2012*