Tuesday

February 28, 2017
Total # Posts: 291

**general chemistry**

. The thermal decomposition of dinitrogen pentoxide in the gas phase to give nitrogen dioxide and oxygen is a first order reaction. If the half life at 55 °C is 410 s, what is the value of the rate constant k? If the initial concentration of dinitrogen pentoxide in an expt...

*October 22, 2009*

**general chemistry**

In a study of the effect of alcohol dehydrogenase on alcohol at 25.0 °C, the concentration of ethanol in a first-order reaction decreased from 220.0 mmol/L to 56.0 mmol/L in 1.22 x 104s. What is the rate constant for the reaction at 25.0 °C?

*October 22, 2009*

**ELA**

How do you punctuate the sentence below, Did Mr. Benson say your reports are due next week?

*October 19, 2009*

**math**

Consider the set of northwestern states or provinces {Montana, Washington, Idaho, Oregon, Alaska, British Columbia, Alberta}. If a person chooses one element, show that in three yes or no questions, we can determine the element.

*October 12, 2009*

**va. studies**

2 questions. what covers most of the land in va.?and what were all indians in va.called?

*September 28, 2009*

**chemistry**

Why is the second not defined by the length of day? Is it because it's such a small fragment of time?

*September 11, 2009*

**va.studies**

in virginia history,when i asked what is being described using the terms that show connection between two places,it is referring to a certain place,that was probobly misworded on my part

*September 8, 2009*

**4th grade**

in va. history,what is being described using the terms bordering,near and next to?

*September 8, 2009*

**math**

summation: 17 sigma n=6 [(–1)^n(–3n^2+8n–2)]

*June 4, 2009*

**math**

I've tried this many times, but I keep getting a really big answer. A rancher wants to fence in an area of 2500000 square feet in a rectangular field and then divide it in half with a fence down the middle parallel to one side. What is the shortest length of fence that the...

*June 4, 2009*

**accounting**

Debit Accts Receivable, Credit sales Hint: anything on account is usually receivables or payables depending on if you are the buyer or seller.

*February 16, 2009*

**math (for Penny)**

thank you

*February 16, 2009*

**math (for Penny)**

hey penny i need to know how to graph it

*February 16, 2009*

**math-algebra 1 (**

hey penny i need help on how to graph it ....

*February 16, 2009*

**math-algebra 1**

how do you graph a function? example: h(x)=x-4

*February 16, 2009*

**Science**

why is water essential to all life?

*February 14, 2009*

**Chemistry**

The molecular weight of glucose is 180.2 and the molecular weight of lactose is 342.3. What is the molarity of a 25% glucose solution? What is the molarity of a 25% lactose solution? I know that molarity = mol/L or mol/1000 mL and that molecular weight is g/mol. But I'm ...

*February 10, 2009*

**college**

one piece of the pie has the same shape as would be formed by the hands of a clock when is exactly three o'clock this piece would represent % of the whole pie?

*November 26, 2008*

**math**

Downward movement of a drill bit towards the metal plate was in the?

*November 20, 2008*

**Statistics**

that's what i needed to know. thanks!

*November 16, 2008*

**Statistics**

So log(2) = 0.3010 how do you find 2 if you know log of something is .3010?

*November 16, 2008*

**math- Patterns... i tried it many times..HELP!!!!**

THX!! and i just got the second one... it was right in front of me...LOL

*September 16, 2008*

**Math:Calculus**

Determine vector and parametric equations for the plane containing the point P0(1, -2, 3) and having direction vectors a= (4, -2, 5) and b = (-3, 3, 7). Thanks for the help.

*July 4, 2008*

**Algebra 1**

Perform the indicated operations and simplify. x-4/y-9 - y+1/y+9 + y-99/y^2-81

*June 30, 2008*

**spanish translation**

Mi nombre es Amethyst. Yo naci en Ghana y vine a America cuando tenia dos anos. Llo soy de estatura baja con piel oscura y pelo oscuro. Llo vivia en Fontana, pero ahora estoy viviendo en Corona. Llo espero ser algun dia una enfermera en pediatria, y deseo vivir en San ...

*May 31, 2008*

**Math**

What is the slope of the equation N = 50 + 50y?

*May 30, 2008*

**Math**

The equation N = 50 + 50y gives the number N of stamps collected when Y is the years that have passed since the collection began. What is the number of stamps that will be in collection after 3 years?

*May 30, 2008*

**Math**

Using the quadratic formula to solve for x in the equation x2 = 7x + 8 results in what value(s)?

*May 30, 2008*

**Math**

The equation y = 240x + 720 gives the cost y (in dollars) when x gadgets are produced. How many gadgets can be produced for $ 30,000?

*May 30, 2008*

**Math**

Where is the vertex of the graph of y = x2 + 6x - 2?

*May 30, 2008*

**Math**

If the path of a frog's jump is approximated by the equation y = -0.25x2 + 5x, what is the height of the frog's jump?

*May 30, 2008*

**Math**

What is the solution for the following system of linear equations? x + 6y = -4 3x - 4y = 10

*May 30, 2008*

**health care**

Thank you.

*May 18, 2008*

**health care**

That wasn't my intention. Some one who thought they were funny kept sending unprintable replies to everyones' posts and that was why I had to resend my question.

*May 18, 2008*

**health care**

how does a managed care model of mental health care reduce health care spending? any thoughts please?

*May 18, 2008*

**Algebra I**

yup! I take Algebra 1 Too so, i know most of it...

*March 30, 2008*

**Algebra I**

118,250.00/4=x

*March 30, 2008*

**Math**

Express the following as a trinomial: (2x-3)(x+7) Express the following as the product of two bionomials: x-squared -5x-24 Explain please...This is review and i don't remember learning it.... Thanks So Mcuh!!!

*March 25, 2008*

**Principle of Ethics**

What are the similarities and differences of the Consequentialist theories(ends based theory) and the Deontological theories(Rules based theory).

*March 8, 2008*

**unknown**

What are some particular industrial revolution technologies that aided in the growth of the cities, and pushed us away from agriculture?

*March 6, 2008*

**Business**

Fiedler asserts that leader behavior is inflexible and cannot be readily changed. Do you agree or disagree with this assertion? Why?

*February 12, 2008*

**Chemistry**

1/2

*February 6, 2008*

**Law**

We don't have text materials Ms. Sue and people put AP Chemistry on here I am asking for simple yes or no and I think that you're rude comments are a little out of line.

*January 28, 2008*

**Law**

what are your credentials?

*January 28, 2008*

**Law**

In a court case can you introduce a psychological evaluation which is signed by a psychologist, if the psychologist is not present in the court room?

*January 28, 2008*

**Chemistry**

Can someone check my answers for me thank you. I have the equation balanced below. 2H2O + K2SO4 --> H2SO4 + 2KOH Ionic equation for the reaction between sulfuric acid and potassium hydroxide. 2H+ + SO4^2- + 2K+ + 2OH- --> 2K+ + SO4^2- + 2H2O Net equation would be: 2H+ + ...

*January 13, 2008*

**Chemistry**

Can you give me an example for the orbital notation for another element not listed above?...

*January 10, 2008*

**Chemistry**

Nothing...=/

*January 10, 2008*

**Chemistry**

Is that the electron configuration or the orbital notation above?

*January 10, 2008*

**Chemistry**

I need help with the orbital notation and electron configuration for the following atom or ion. Im not very good at them. Calcium Arsenic Fluride,F1- Mg2+

*January 10, 2008*

**English**

Well my suggestion is to start(if possible) with an exclamation it all way captures the readers attention.

*November 6, 2007*

**English**

What do you mean; please explain so I have a better understanding.

*November 6, 2007*

**history**

Did this help

*November 6, 2007*

**history**

The creed of Islam, and one of the religion's five pillars. Shahada is best translated with 'testimony'. Shahada is not only a testimony of ones belief, but also a legal testimony. I received this information from the Encyclopedia of the orient for the rest of this...

*November 6, 2007*

**Business**

Yes I think this is valid. The thing is I don't know how to explain it; could you help with that.

*November 6, 2007*

**Business**

Tariffs protect American jobs and wages. Is this valid or invalid? Justify your answer.

*November 6, 2007*

**Business**

Do tariffs encourage Americans to buy U.S.-made products because doing so is patriotic?

*November 6, 2007*

**Math**

The answer to your question is 34. You have to use order of operations. first do 8x6 which is 48, then 7x2 which is 14 so subtract 48 and 14.

*November 5, 2007*

**US HISTORY**

The 19th amendment gave women the right to ____

*September 5, 2007*

**US HISTORY**

This states the purpose of the Constitution

*September 5, 2007*

**Environmental Science**

BIRTH IS AN INCREASE IN THE POP. DEATH IS A DECREASE IN POP. I DON'T KNOW ABOUT FERTILITY. MIGRATION WOULD BE A DECREASE AN INCREASE BECAUSE PEOPLE MOVE AND LEAVE THIS COUNTRY.

*September 5, 2007*

**Algebra 2**

I PUT IT IN THE CALCULATOR AN ITS JUST A STRAIGHT LINE ON THE -4...SO (6,-4),(-1,-4),(3,-4),(-5,-4)?

*September 5, 2007*

**Algebra 2**

DENG....HOLD ON

*September 5, 2007*

**Algebra 2**

YOU DON'T HAVE A GRAPHING CALCULATOR?

*September 5, 2007*

**PHYSICS**

AN OSTRICH CAN RUN AT SPEEDS OF UP YO 72 KM/H. HOW LONG WILL IT TAKE AN OSTRICH TO RUN 1.5KM AT HIS TOP SPEED?

*September 5, 2007*

**PHYSICS**

A BUS TRAVELS 280 KM SOUTH ALONG A STRAIGHT PATH WITH AN AVERAGE VELOCITY OF 88 KM/H TO THE SOUTH. THE BUS STOPS FOR 24MIN, THEN IT TRAVELS 210 KM SOUTH WITH AN AVERAGE VELOCITY OF 75 KM/H TO THE SOUTH. A. HOW LONG DOES THE TOTAL TRIP LAST? B.WHAT IS THE AVERAGE VELOCITY FOR ...

*September 5, 2007*

**PHYSICS**

4)SIMPSON DRIVES HIS CAR WITH AN AVERAGE VELOCITY OF 48.0KM/H TO THE EAST. HOW LONG WILL IT TAKE HIM TO DRIVE 144KM ON A STRAIGHT HIGHWAY? 5)LOOK BACK AT QUESTION 4 . HOW MUCH TIME WOULD SIMPSON SAVE BY INCREASING HIS AVERAGEVELOCITY TO 56.0KM/H TO THE EAST?

*September 5, 2007*

**PHYSICS**

SIMPSON DRIVES HIS CAR WITH AN AVERAGE VELOCITY OF 48.0KM/H TO THE EAST. HOW LONG WILL IT TAKE HIM TO DRIVE 144KM ON A STRAIGHT HIGHWAY?

*September 5, 2007*

**PHYSICS**

IT TAKES YOU 9.5 MIN TO WALK AN AVREAGE VELOCITY OF 1.2 M/S TO THE NORTH FROM THE BUS STOP TO THE MUSEUM ENTRANCE. WHAT IS YOUR DISPLACEMENT?

*September 5, 2007*

**PHYSICS**

IF JOE RIDES SOUTH ON HIS BIKE IN A STRAIGHT LINE FORE 15 MIN WITH AN AVERAGE SPEED OF 12.5KM/H, HOW FAR HAS HE RIDDEN?

*September 5, 2007*

**PHYSICS**

SO ITS WRONG?

*September 5, 2007*

**PHYSICS**

AVERAGE VELOCITY AND DISPLACEMENT HEATHER AND MATT WALK EASTWARD WITH A SPEED OF 0.98M/S. IF IT TAKES THEM 34 MINS TO WALK TO THE STORE, HOW FAR HAVE THEY WALKED?

*September 5, 2007*

**Algebra**

Could you verify my answer thank you Identify the rate, base, and amount in the following application.

*July 13, 2007*

**algerbra**

Find the GCF of each product. (2x2+5x)(7x - 14) (6y2 -3y)( y+7) When the term "Greatest Common Factor" is used, it applies to a pair of numbers. The terms you have liated are polynomials that have already been factored. They could be further factored into 7x(2x+5)(x-...

*July 2, 2007*

**math**

A rectangle has sides of 3x – 4 and 7x + 10. Find the expression that represents its perimeter. 3x-4+7x+10= 3x+7x=10x −4+10= 14 10x+14 that is my answer please help You just added two sides, a rectangle has four sides. So the perimeter should be twice what you ...

*June 29, 2007*

**math**

the group covered the first 70 miles in 10 hours. then it doubled its paceto travel 280 miles. how long did it takethe group to travel 350 miles? 70 mi/h and 140mi/h 350-70 = 280 280 miles left, 140 miles every 10 hours so 20 hours 20hrs + 10hrs = 30 hrs it took the group 30 ...

*May 2, 2007*

**MAth**

Please help. a). How many ways can a person select three appetizers and two soups if there are six appetizers and five soups on the dinner menu? b). Three married couples have bought tickets for six seats in a row for a movie. - HOw many ways can they be seated? - How many ...

*February 13, 2007*

**Chemistry**

If 100mL of 1mol HCL is mixed with 100 mL of 1mol NaOH, a temp rise of 6.2C occurs. What temp change will be obserbed, if under the same conditions, 10mL of 1mol NaOH is mixed with 10mL 1mol HCL? x Why wouldn't it be the same? One gets 1/10 th of the heat, but has only 1/...

*February 1, 2007*

**math**

Use the table to estimate how long it took Stella Pajunas to type 100 words # of words: 36 72 108 144 180 216 # of sec: 10 20 30 40 50 60 Its a nice linear line, so no statistical estimation technique required. For every 10 seconds, Stella can type 36 words. So 36 is to 10 as ...

*January 30, 2007*

**math**

Find the value of each variable in the parallelogram. m<1=9x,m<2=x+y, and m<3=30z.

*November 26, 2006*

**math**

If m<1 =m<3=8x,m<2=2x-20,and m<4=x,find the value of x.

*November 26, 2006*

**math**

Solve for x in the figure if AB=5x-5 and BC=2x+3. You need to provide additional information on how AB is related to BC before we can help you with that question. Perhaps that is what the missing figure is supposed to show.

*November 26, 2006*

**math**

The measures of two sides of a triangle are 9 and 15. Use an inequality to express the range of the measure of the third side,m.

*November 26, 2006*

**math**

Find the diameter of the circle(not drawn to scale). BC=13,and DC=19. Round your answer to the nearest tenth. Onc again, without the figure in question, or an accurate description of it, we cannot help you.

*November 26, 2006*

**math**

Find the measure of each variable if m<A=34 and m BC=112.(not drawn to scale)

*November 26, 2006*

**math**

Find the coordinates of the center and the radius of the circle with diameter CD. C(-4,2),D(8,8)

*November 25, 2006*

**math**

A design on a balloon is 6 cm wide when the balloon holds 44 cm to the third power of air. How much must the balloon hold for the design to be 24 cm wide? Since the "width" increases by a factor of 4, the volume will increase by a factor of 4^3 = 64, even if the ...

*November 25, 2006*

**Ap CHem**

For how many electrons in Sr. Does A)n=4; l=1 B)n=3;l=2;ml=1 C)n=1;l=1;ml=0 You must know the variations possible. n = 1, 2, 3, ...... l = 0, 1, 2, etc up to n-1. ml=-l to +l (this is -ell to +ell) ms = +/- 1/2 Start with n = 1 and work your way up.

*October 29, 2006*

**Evironmental Science**

What part of a pond ecosystem is not a part of the pond community.Explain First read the definition of community at the following site: http://en.wikipedia.org/wiki/Community please read this definition of abiotic http://en.wikipedia.org/wiki/Abiotic Then read this definition ...

*September 9, 2006*

**Evironmental science**

Give an example of a population (other than people)that could be found in a backyard(Be specific). Check your own backyard. Look for insects, moles, birds, grubs, grasses, and wildflowers (like dandelions).

*September 9, 2006*

**unscrambling word**

can you unscramble thus word? vlicirwa

*June 14, 2005*