Friday

January 20, 2017
Total # Posts: 45

**chem**

3. Given a chemical reaction and H associated with the reaction: stoichiometry and limiting reactant problem involving gases. Why would we need delta H for a stoichimetry or limiting reactant problem? And can i get an example pleasE?

*November 15, 2012*

**analyzing poems**

what does it mean by his diamond body of his being?

*November 14, 2012*

**analyzing poems**

so i think he talks about himself as a dancer who tries to find his idenity through his own work. And he doesn't want to sink into the sand. is there anything else?

*November 14, 2012*

**analyzing poems**

Spatial depths of being survive The birth to death recurrences Of feet dancing on earth of sand; Vibrations of the dance survive The sand; the sand, elect, survives The dancer. He can find no source Of magic adequate to bind The sand upon his feet, his feet Upon his dance, his...

*November 14, 2012*

**lit- sentence rewording**

I'm writing an essay and I keep using opportunities, accusations, and believe a lot. Are there any other words similar to this one?

*October 7, 2012*

**lit- the crucible**

I'm writing an essay on Abigail and how she is very persuasive by using fear as a tool of revenge. “Let either of you breathe a word, or the edge of a word, about the other things, and I will bring a pointy reckoning that will shudder you.” “ No, I love god...

*October 4, 2012*

**PRECALC**

solve for x in the interval zero to two pi. 2 sin 4x = 1 i got 5 pi/24 and pi/ 24 but my teacher said that there should be eight solutions. what would those be and how would i find it"

*October 3, 2012*

**pprecalc**

a windshield wiper on a a plymouth acclaim is 20 in. long and has a blade of 16in long. if the wiper sweeps through an angle of 110 degree, how large an area does the wiper blade clean?

*October 2, 2012*

**pprecalc**

the function is one of the form y=g(x) +cosbx. find two linear functions y1 and y2 related to g such that y1 is less than or equal to y is less than or equal to y2. a. y= 2x + cos x b. y= 1-0.5x+ cos2x

*October 2, 2012*

**us history**

describe the structure of the central(federal) government under the Articles of Confederation. What revolutionary principles were enacted though this structure? Why did the structure fail to created an enduring government? ----------------------------------------- It was ...

*September 25, 2012*

**math**

a building cast a shadow approximately 130 ft long on the street when the suns ray form an 82.9 degree angle with the earth. how tall is the building? 180-82.9-90= 7.1 degree tan 7.1 = x/130ft x= 16.19ft is this correct? thanks!

*August 26, 2012*

**math**

52.36 mi / hr

*August 26, 2012*

**math**

the wheel ( including the tire) of a sports car under development by one of the Big Three auto companies has an 11 in radius. what would be the car's speed in miles per hour if its wheel are turning 800 rpm? ------------------- 800 rev/ 1 min x 60 min/ 1 hr x 2 pi radians...

*August 26, 2012*

**chem**

2C2H6(g) + 7O2 -> 4CO2 (g) + 6 H2o (g) What quantity of reactant remains after ignition of a mixture that contains 0.40 moles of C2H6 mixed with 1.60 moles of O2? ( assume maximum reaction according to the equation above)

*August 26, 2012*

**chem**

which pair of atoms represent nuclei that have the same number of neutrons? a Co36 and Co 58 b. Mn57 and Fe 57 c. Ni 58 and Fe 57 d. Ni 58 and Co 57 e. Ni 59 and Fe 56

*August 26, 2012*

**chem**

over the years, the thermite reaction has been used for welding railorad rails, in incendiary bombs, and to ignite solid fuel rocket motors. The reaction: Fe2O3(s) + 2 Al (s) -> 2 Fe(l) + Al2O3 (s) What masses of iron ( III) oxide and aluminum must be used to produce 15.0 ...

*August 26, 2012*

**chem**

lead (IV) hydroxide- ionic cation= +4 anion= -1 chemical formula= Pb(OH)4 Magnesium phosphate-ionic cation= +2 anion= -2 chemical formula= MgPO4 is ammonium sulfate molecular or ionic?

*August 20, 2012*

**chem**

After I did everything, I got the empirical formula to be C2 H5.8 O?

*August 19, 2012*

**chem**

A sample of an alcohol is tested and found to contain 52% carbon, 35% oxygen, and 13% hydrogen by mass. Tests indicate that the molecular weight of the molecule is between 30 and 80. What is the molecular formula of the alcohol?

*August 19, 2012*

**chem**

sodium + water —>? how do you predict the products? I got sodium oxide + hydrogen instead of sodium hydroxide + hydrogen, which is the answer.

*August 19, 2012*

**chem**

Thanks!

*August 19, 2012*

**chem**

the combustion of 1.83 grams of a compound which only contains C,H, and O yields 4.88 grams of CO2, and 1.83 grams of H2O. What is the empirical formula of this compound? ------------------------------------------ 4.88 g CO2 x 1 mol CO2/44.01 g CO2 x 2 mol O2= .2217 mol O2 1....

*August 19, 2012*

**math**

how many different positive four-digit integers can be formed if the first digit must be 2, the last digit cannot be zero, and digits may be repeated? I know the answer is 900 but I'm not sure how I would get the answer? thanks!

*August 17, 2012*

**chem**

Aspirin, C9H8O4, is produced from salicylic acid, C7H6O3, and acetic anhydride, C4H6O3: C7H6O3 + C4H6O3 --> C9H8O4 + HC2H3O2 a. How much salicylic acid is required to produce 1.5 x 10^2 kg of aspirin, assuming that all of the salicylic acid is converted to aspirin? b. how ...

*August 17, 2012*

**math- finding zeros**

oh yeah, I forgot about the conjugates! thanks! One more question, how do i divide x^4-2x^3-x^2+6x-6 by x^2-2x+2 using synthetic division?

*July 26, 2012*

**math- finding zeros**

Using the given zero, find all the zeroes and write a linear factorization of f(x) 1 + i is a zero of f(x)= x4-2x^3-x^2 + 6x -6 I did synthetic division and I got that it wasn't a zero?

*July 26, 2012*

**chem**

im a bit confused on how and why surface tension and viscosity decrease with increasing temperature?

*July 16, 2012*

**US History**

Did people in Virginia convert Native Americans to Christianity?

*July 9, 2012*

**chem**

for solutions of a weak acid, a graph of pH versus the logarithm of the initial acid concentration should be a straight line. What is the magnitude of the slope of that line?

*July 4, 2012*

**chem**

If a neutral solution of water, with pH = 7.00, is heated to 50 deg C , the pH drops to 6.63. Does this mean that the concentration of [H+] is greater than the concentration [OH-]of ?

*July 2, 2012*

**APUSH**

What was the difference in early settler's relationship with Native Americans between early Virginia and New England?

*July 2, 2012*

**History**

What was the impact of the Open Door Policy in China? Did it broaden the gap between the rich and the poor in china?

*May 21, 2012*

**math trig**

ln(2x-5)= 4 how do i this problem? thanks!

*May 21, 2012*

**math**

sorry, the plus one is part of the exponent 2^(x+1) =9 is it possible to move the 1 to the otherside still?

*May 21, 2012*

**math**

2^x+1 =9 how do i solve for this? thanks!

*May 21, 2012*

**math**

find the exponential function of the form y=ab^x whose graph passes through the points (4,6) and (7,10) i got a=3.04 and b= 1.185 so my equation is y=3.04(1.185)^4 is this correct? one more problem. find a power function of the form y=ax^b whose graph passes through the points...

*February 7, 2012*

**math**

y=2x^2+3/x-1 how would you find the x intercept and vertical asymptote?

*February 5, 2012*

**French! please help!**

how do u say The world needs bigger heroes? without using the online translator?

*September 15, 2009*

**-x?**

can't it be -(-6) also?

*September 10, 2009*

**-x?**

is -x negative or postive? how do u know? give example

*September 10, 2009*

**Expresion and Equations?**

How are they the same? How are they differnt?

*September 10, 2009*

**MATH Dx**

14 divide by 7 35 divide by 7 equals 2/5

*August 31, 2009*

**Math Algebra**

huh?

*August 31, 2009*

**Math Algebra**

The natural numbers are closed under division. true or false? the integers are closed under division. true or false? please explain, my teacher did not explain it at all!

*August 31, 2009*

**math**

if it has 90 degrees total degrees of all triangles are 180 so u need at least one or two numbers to find out the other angle

*August 31, 2009*

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