Thursday

October 8, 2015
Total # Posts: 55

**chemistry**

1 mol.
*October 12, 2013*

**chemistry**

Aluminium is manufactured by electrolysis(electrolytic decomposition) of bauxite, Al2O3. How much aluminium can be obtained from 1kg of pure bauxite?
*October 12, 2013*

**math**

use subsitution system to solve 4x+5y=21 Y=3x-11
*March 10, 2013*

**CHEMISTRY: URGENT DRBob222**

I thought it was similar so I wrote... x + y = 30cm^3 x + 2y = 61.5cm^3 i.e 2x + 2y =60cm^3 x + 2y = 61.5cm^3 therefore x= -1.5cm^3(volume of methane) and y= {61.5-(-1.5)}/2= 31.5cm^3(volume of ethane) However my teacher said the volume i got for ethane is wrong, because my ...
*October 29, 2012*

**CHEMISTRY: URGENT**

Ok I understand...:-)
*October 29, 2012*

**CHEMISTRY: URGENT**

****There's something you should know though...I wrote the reaction like how you did. (CH4+ C2H6) + 2O2 ==> CO2 + H2O and my teacher said H2O is not part of the residual gases. She said H2O should be replaced with O2. (CH4+ C2H6) + 2O2 ==> CO2 + O2 ****
*October 29, 2012*

**CHEMISTRY: URGENT**

Lol when you explain it. Not when my teacher teaches me, I never understand a word she says. Anyways thanks alot for staying up to help me. There's something yo should know though...I wrote the reaction like how you did. CH4 + 2O2 ==> CO2 + H2O and my teacher said H2O ...
*October 29, 2012*

**CHEMISTRY: URGENT**

Yes the answer to the first question was correct, that's what my teacher got too... but she did it like this. Either way its correct. x + y = 24cm^3 x + 2y = 32cm^3 then 32 - 2y + y = 24cm^3 32-y = 24cm^3 y= 8cm^3(volume of ethene) x + 8 = 24cm^3 x= 16cm^3(volume of methane)
*October 29, 2012*

**CHEMISTRY: URGENT**

If yes...Here it is... 24cm^3 of a mixture of methane and ethane were exploded with 90cm^3 of oxygen. After cooling to RTP the volume of gases was noted and it decreased by 32cm^3 when treated with KOH. Calculate the composition of the mixture.
*October 29, 2012*

**CHEMISTRY: URGENT**

The one from last week?
*October 29, 2012*

**CHEMISTRY: URGENT**

ok thanks
*October 29, 2012*

**CHEMISTRY: URGENT**

I thought it was similar so I wrote... x + y = 30cm^3 x + 2y = 61.5cm^3 i.e 2x + 2y =60cm^3 x + 2y = 61.5cm^3 therefore x= -1.5cm^3(volume of methane) and y= {61.5-(-1.5)}/2= 31.5cm^3(volume of ethane) However my teacher said the volume i got for ethane is wrong, because my ...
*October 29, 2012*

**CHEMISTRY: URGENT**

30cm^3 of a mixture of methane and ethane were mixed with 100cm^3 of oxygen at ordinary temperature and pressure and exploded. After cooling the residual gases occupied 61.5cm^3. Find the percentage by volume of each gas in the mixture, methane (CH4) and ethane(C2H6).
*October 29, 2012*

**CHEMISTRY: URGENT**

Thank you DrBobb22
*October 23, 2012*

**CHEMISTRY: URGENT**

24cm^3 of a mixture of methane and ethane were exploded with 90cm^3 of oxygen. After cooling to RTP the volume of gases was noted and it decreased by 32cm^3 when treated with KOH. Calculate the composition of the mixture.
*October 23, 2012*

**physics college**

F= 500N , m= 10kg , t= 2.1s , a=? , v(f)=? F= (m)(a) therefore a= F/m so a= 500/10= 50ms and v= u(i) + (a)(t) so v(f)= 0 + (50)(2.1)= 105ms note=== v(f) is final velocity and v(i) is initial velocity.
*October 23, 2012*

**CHEMISTRY**

24cm^3 of a mixture of methane and ethane were exploded with 90cm^3 of oxygen. After cooling to RTP the volume of gases was noted and it decreased by 32cm^3 when treated with KOH. Calculate the composition of the mixture.
*October 23, 2012*

**criminal justice ethics**

I need help understanding this question. it is hard understanding the book.
*September 13, 2012*

**criminal justice ethics**

Define social contract and explane the different views of Hobbs and Locke.
*September 13, 2012*

**PHYSICS**

A stopper tied to the end of a string is swung in a horizontal circle. If the mass of the stopper is 13.0 g, and the string is 93.0 cm, and the stopper revolves at a constant speed 10 times in 11.8 s, a. What is the angular velocity of the stopper?
*February 8, 2012*

**calc**

Annual sales of bottled water in the country in the period 1993-2003 could be approximated by the function below, where t is time in years since 1990. Were sales of bottled water accelerating or decelerating in 2000? How fast? R(t) = 10 t**2 + 100 t + 2400 text( million ...
*December 7, 2011*

**calc**

R(t)=85 t-2 t**2; t=4
*December 7, 2011*

**calculus**

In February, 2002, each episode of "Becker" was typically seen in 8.3 million homes, while each episode of "The Simpsons" was seen in 7.5 million homes. Your marketing services firm has been hired to promote Bald No More, Inc.'s, hair replacement ...
*December 7, 2011*

**calculus**

Annual sales of bottled water in the country in the period 1993-2003 could be approximated by the function below, where t is time in years since 1990. Were sales of bottled water accelerating or decelerating in 2000? How fast? R(t) = 10 t**2 + 100 t + 2400 text( million ...
*November 29, 2011*

**CAlculus**

The graph of the derivative, f '(x), is given. Determine the x-coordinates of all points of inflection of f(x), if any. (Assume that f(x) is defined and continuous everywhere in [-3, 3]. If there are more answer blanks than inflection points, enter NONE in any remaining ...
*November 29, 2011*

**calculus**

Maximize p = 2x + 2y subject to 4x + 8y 24 8x + 4y 32 x 0 , y 0 (Round all answers to the nearest 0.1.) p = Incorrect: Your answer is incorrect. x = Incorrect: Your answer is incorrect. y = Incorrect: Your answer is incorrect.
*November 13, 2011*

**calc**

The likelihood that a child will attend a live musical performance can be modeled by the following equation. q=0.01(0.0007 x**2+0.4 x +33) text( ) \(15<=x<=100\) Here, q is the fraction of children with annual household income x thousand dollars who will attend a live ...
*November 2, 2011*

**calc**

You have been hired as a marketing consultant to Johannesburg Burger Supply, Inc., and you wish to come up with a unit price for its hamburgers in order to maximize its weekly revenue. To make life as simple as possible, you assume that the demand equation for Johannesburg ...
*November 2, 2011*

**calc**

The demand curve for the comics is given by the following equation, where q is the number of copies the publisher can sell per week if it sets the price at $p. q=(388-p)**2/50 text( ) \(0<=p<=388\) (a) Find the price elasticity of demand when the price is set at $33 per ...
*November 2, 2011*

**Statistics**

A vending machine dispenses coffee into a twelve-ounce cup. The amount of coffee dispensed in to the cup is normally distributed with a standard deviation of .08 ounce. You can allow the cup to overfill 2% of the time. What amount should you set as the mean amount of coffee to...
*June 5, 2011*

**probabbility**

Find the (theoretical) probability of a given event, assuming that the dice are distinguishable and fair, and that what is observed are numbers uppermost. Two dice are rolled; the numbers add to 7. 1
*December 3, 2010*

**math **

My couch potato friend enjoys sitting in front of the TV and grabbing handfuls of 4 chocolates at random from his snack jar. Unbeknownst to him, I have replaced one of the 18 chocolates in his jar with a cashew. (He hates cashews with a passion.) How many possible outcomes are...
*November 29, 2010*

**algebra 2**

1/2 {9+5[-3]}
*September 13, 2010*

**algebra 2**

10-[5+9{4}]
*September 13, 2010*

**Finance**

The future value of a $500 annual deposit to a savings account after three years is $______, assuming an investment rate of 10% and annual compounding (end of period).
*February 7, 2010*

**physics**

A dipole consists of two charges +q and -q, held apart by a rod of length s, as shown in the diagram. If q = 9 nC and s = 2 mm, what is the magnitude of the electric field due to the dipole at location A, a distance d = 5 cm from the dipole? E=____N/C What is the magnitude of ...
*February 6, 2010*

**4th grade**

what triangle
*March 23, 2009*

**4th grade**

da <3
*March 22, 2009*

**Interest Question**

what is the difference between the simple and compound semi annually interst on 250 dollars in 2 years at 14%
*January 21, 2009*

**9th grade**

how does ozone form?
*September 22, 2008*

**Molecular Biology!**

Why is DNA not soluble in ethanol, on a molecular level?
*April 1, 2008*

**Biochemistry**

Why is DNA not soluble in ethanol, on a molecular level?
*April 1, 2008*

**Ms. Sue Help me, please**

Thanks for trying :)
*April 1, 2008*

**Ms. Sue Help me, please**

Hello, I was wondering if it was possible for you to assist me in having a science/biology teacher answer my question. It is called 12 Biology and I reposted as Biology Lab Banana DNA. My reason for this is that so many questions keep popping in, all in a row**, and mine is ...
*April 1, 2008*

**Biology Lab Banana DNA**

We did a DNA extraction lab of a banana. I was wondering, what exactly is the purpose of using mushed bananas, and how was water used as well (we used the water after using soap and salt, but I can't understand what the water did)? Thanks.
*April 1, 2008*

**eglish 16**

Sorry, I haven't done grammar in years! :)
*April 1, 2008*

**eglish 16**

This is similar to 13 or 14, I don't remember which number, but the one with the presenters and the notes. So, I would suggest 16 a.
*April 1, 2008*

**english 14**

I think this is one is also right, but, please make sure you check all of these with your teacher.
*April 1, 2008*

**english 13**

Again, I believe this to be correct.
*April 1, 2008*

**english**

Yes, that is correct.
*April 1, 2008*

**Biology**

What are the biotic factors of the temperate deciduous forest? Thank you.
*February 26, 2008*

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