# Posts by Angel

Total # Posts: 1,142

**Chem**

What is the enthalpy for the following reaction? overall: C2H4+H2O--->C2H5OH is -1411kJ correct??

**Chemistry**

A 455-g chunk of iron is removed from an oven and plunged into 385g water in an insulated container. The temperature of the water increases from 27 degrees celsius to 89 degrees celsius. If the specific heat of iron is 0.449 J g^-1 degrees Celsius^-1, what must have been the ...

**algebra 2**

Factor: 27X^2-90X+27

**Algebra**

I'm soo confused on how to solve this prboblem. x+5/8x-3 = 11/2

**english**

Can someone please show me an example of alliteration and small definition?

**Algebra**

(x-6)^2=1? Give exact and approximate solutions to three decimal places

**CALC**

why is the surface area of a cube not the derivative of a volume?

**Physics**

Consider an inefficient engine which draws 200 J of heat from a hot reservoir at 100oC, converts 48 J to work, and rejects 152 J to a cold reservoir at 0oC. Theoretically, how much maximum work can be produced if the efficiency of the engine is maximized? How much work was &#...

**Physics**

One gram of water is placed in a cylinder and the pressure is maintained at 2.0 x 105 Pa. The temperature of the water is raised by 31oC. Determine the change in internal energy when, a) the water is in its liquid phase and causes an expansion of 1.0 x 10-8 m3. b) Water is in ...

**Physics**

Consider an inefficient engine which draws 200 J of heat from a hot reservoir at 100oC, converts 48 J to work, and rejects 152 J to a cold reservoir at 0oC. Theoretically, how much maximum work can be produced if the efficiency of the engine is maximized? How much work was &#...

**Physics**

Consider an inefficient engine which draws 200 J of heat from a hot reservoir at 100oC, converts 48 J to work, and rejects 152 J to a cold reservoir at 0oC. Theoretically, how much maximum work can be produced if the efficiency of the engine is maximized? How much work was &#...

**Physics**

One gram of water is placed in a cylinder and the pressure is maintained at 2.0 x 105 Pa. The temperature of the water is raised by 31oC. Determine the change in internal energy when, a) the water is in its liquid phase and causes an expansion of 1.0 x 10-8 m3. b) Water is in ...

**Physics**

One gram of water is placed in a cylinder and the pressure is maintained at 2.0 x 105 Pa. The temperature of the water is raised by 31oC. Determine the change in internal energy when, a) the water is in its liquid phase and causes an expansion of 1.0 x 10-8 m3. b) Water is in ...

**Physics**

Consider an inefficient engine which draws 200 J of heat from a hot reservoir at 100oC, converts 48 J to work, and rejects 152 J to a cold reservoir at 0oC. Theoretically, how much maximum work can be produced if the efficiency of the engine is maximized? How much work was &#...

**Chem**

NO3 is always soluble though. It doesn't mix with Na (which is also always soluble).

**social studies**

vocabulary an area that has one or more features in common.

**math**

i need the magic square from the follow numbers 3,4,5,6,7,8,9,10,11

**math**

what are2 ways to write 67,000 in word form

**Biochemistry**

Sorry! HEPES, is a commonly used component of physiological buffers. The PKa of the protonated amino group of HEPES is 7.55 at 25C. Describe the preparation of 1.00L of 0.100M HEPES buffer, pH 8.00, from the sodium salt of the basic form of HEPES (MW 260.3), 6.0M HCl and ...

**Biochem**

HEPES, is a commonly used component of physiological buffers. The PKa of the protonated amino group of HEPES is 7.55 at 25C. Describe the preparation of 1.00L of 0.100M HEPES buffer, pH 8.00, from the sodium salt of the basic form of HEPES (MW 260.3), .0M HCL and deionized water

**Chemistry**

I'm completely confused on how to solve this problem. Convert 125 hp-hr/long ton to kW-s/kg.

**Chemistry**

I'm completely confused on how to solve this problem. Convert 125 hp-hr/long ton to kW-s/kg.

**Algebra**

Thank You

**Algebra**

Write the equation of the function that has a graph the shape of y=/x/ ,reflected about the x-axis and shifted down 1 unit.

**geometry**

If EF = 2x – 12, FG = 3x – 15, and EG = 23, find the values of x, EF, and FG. The drawing is not to scale.

**english**

Can you help me with my figative lang. and it has to be about me

**geometry**

measure of angle RST=5(x+1)-3

**Intermediate Algebra**

I'm even more confused then before.

**Intermediate Algebra**

Factor: 9x^2 - 42x + 49 So far I have 3(3x^2 - 14x + ) I have no idea if this is right or if this equation is prime. Or if I'm solving it correctly.

**algebra**

For which value of x is the inequality 2x > 6 true? Is it: 0, 1, 2, 3 or 4

**science true or false**

false

**biochemistry**

The R-group of histidine is a weak base with a pKb of 6.0. Calculate the percent ionization at pH 7.4. What is the net charge of the following amino acids (single letter codes used) at pH7.4? Glycine Serine Glutamic Acid Lysine Please help. I'm not sure how I'm ...

**math**

which of the following expressions shows the equation to use in the finding the dimensions of a cube N by N by N with a volume 125 1) n3=125 2) n2=125 3) 3n=125 4) n=125/3 5) not enought info given need help with this problem!!

**us government cp**

what are the qualificalions to be a cadidate for governor?

**calculus**

no answers yet?

**Developmental Psychology**

There are a number of ways that emotional or psychological problems can develop in children. Problems can result from anything that disrupts a child's sense of safety and security. This could include things such as an unstable or unsafe environment, separation from a ...

**math**

At a carnival, there is a game where you throw a coin on a colored square. You are given 3 coins and can land on any square more than once. What is the probability of landing on a red square on your first toss, a red square on your second toss, and a white square on your third...

**Health**

During an emergency room examination for an injured arm, the physician palpates the arm's entire lengh, starting at the shoulder and ending at the fingers of the hand. THis process takes him from a/an------ position.

**Business**

How has the control mechanisms impacted the four functions of management in the Coca Cola Corporation?

**Chemistry**

Solubility of a solute X is 20 g / 100 g of water at 450C and 10 g / 100 g of water at 250C. What happens when a solution of 15 g of X in 100 g of water at 450C is cooled to 250C.

**Chemistry**

Why is ∆H hydration a negative quantity for ionic compounds?

**chemistry**

Consider two beakers, one with water and other one with sodium chloride solution. Which of these will have higher vapor pressure

**math**

in each game there are 12 red checkers and 12 black checkers.If tom put all the checkers in the bag and randomly picked 2,what is the probability that both will be black?

**business**

Tomlinson, in Cultural Imperialism: a Critical Introduction, London: Pinter Publishers, 1991, suggests that certain dominant cultures threaten to overwhelm other more vulnerable ones. He argues that cultural imperialism gathers in a number of fairly discrete discourses of ...

**business**

What is the relationship between ethics and the law? Can an action be unethical but not illegal? If so, explain how and give an example

**Colleges**

can someone give me a list of 4 year colleges that teach criminology or criminal justice

**Statistics**

8/50

**Drug Abuse**

My 8th grader is doing some research for a 4-H project and needs to know how drugs affect the family and friends of a drug addict?

**Lifeskills**

Need help people making a resume for hw assignment!!? okay so I'm in 9th grade and have life skills .we have to make our own resume on the job we want. i want to study criminology and become a detective so i have to write stuff sorta pertaining to it. like in my summary i ...

**language arts**

chomsky theorized that language is

**Biology**

what is an example of gross primary productivity of community

**Biology**

what is an example of biodiversity

**Social Studies**

I am doing an ABC book to for Florida and i need a word for the letter X to. IT is due MAY 26 , 2010!!!!!!!!!!!!!!!! I need HELP PLZ PLZ PLZ PLZ PLZ THANKS :)

**Chemistry**

How many moles of electrons are required to produce 23.8 g Cu from a CuSO4 solution?

**Lifeskills**

Thanks sooo much.. this helped a lot

**Lifeskills**

Yeah i have to interview them for a class

**Lifeskills**

What are good forensic questions i can ask a detective? name a couple please :)

**math**

..... Amy finished 6/12 of the problems on her timed test. Jackson finished 4/6 ... the timed test. Did they finish the same fraction of the problems? Explain. ...

**English**

What is meant by defy convention? The two definitions do not make any sense together.

**Math**

HEALWAYSWANTEDABIGMACK

**japan**

yes

**Chemistry**

The molarity of Sr2+ in a saturated solution of SrSO4 was determined to be 0.000500 M. Calculate the solubility product constant (Ksp) for SrSO4. SrSO4(s) = Sr^2+(aq) + SO4^2- (aq) Molar Mass (g/mol) SrSO4 183.68 This is what I know: Ksp = [Sr][SO4]

**4th grade**

what is 96/4

**Math**

How do you do this problem because i feel like i did it wrong (3ã2 + 4)^2 (3ã2 + 4)(3ã2 + 4) 9ã4 + 12ã2 + 12ã2 + 16 9*2ã2 + 12ã2 + 12ã2 + 16 18ã2...

**statistics**

A data set consists of a set of numerical values. Which, if any, of the following statements could be correct? There is no mode. There are two modes. There are three modes.

**English**

For number 2, why don't you just say that a simile is a figure of speech that draws a comparison between two different things, using like or as.

**english**

Well, criticism can make me weak at times; but I don't lose my courage. I gather enough courage to defend myself, and I have made criticism my strength today. I hate it how people bad talk about me, but then again, hearing those comments I make myself stronger, and ...

**english**

Has any one of you ever been criticized at a point in your life? If you have then how has it felt? Do you take criticism to be your weakness or strength.

**Maths**

if q>0, how can u use the graph of y =sin theta to draw the graph of y =sin theta +q?

**Ancient China**

what tool did they use?

**Ancient China**

What tool did the ancient China people use to try to communicate with the dead?

**Chemistry**

The value of the equilibrium constant, Kc, at a certain temperature is 4.20 x 10-2. Would the reaction as represented by the chemical equation favor reactants or products? Enter Product or Reactant. PCl5(g) = PCl3(g)+Cl2(g)

**Chemistry**

Calculate the value of the equilibrium constant (Kc) for the reaction displayed if the following equilibrium concentration data were measured at 1200 K: [Br2(g)] = 0.0001151 mol/L, [Br(g)] = 0.00004423 mol/L. Br2(g) = 2Br(g)

**calculus**

i got it nvm

**calculus**

A plane flying with a constant speed of 23 km/min passes over a ground radar station at an altitude of 5 km and climbs at an angle of 35 degrees. At what rate, in km/min is the distance from the plane to the radar station increasing 7 minutes later?

**chemistry**

what type of reaction is Al+S8=Al2S3

**chemistry**

The initial concentration for the compounds involved in the reaction displayed were determined to be [BrI(g)] = 0.3220 mol/L, [Br2(g)] = 0.3287 mol/L, [I2(g)] = 0.004086 mol/L. Calculate the value of the equilibrium constant (Kc) at 423.0 K if the equilibrium concentration of ...

**algebra**

I am working on homework with properties of triangles and i am lost can you help

**calculus 2**

Consider the solid obtained by rotating the region bounded by the given curves about the line x = -3. y = x^2 , x = y^2 Find the volume V of this solid. I keep finding the wrong answer.

**Math**

lets say you're doing addition 1/5 + 1/2 you can't add them directly until you find the common denominator. You can use LCM(lowest common multiple) for these it is ten. so 2/10 + 5/10 = your anwer

**chemistry**

A 893 g sample of a solution of the solute (CH3)2CO in the solvent C4H8O that has a concentration of 28.6 pph(parts per hundred) by mass (CH3)2CO is available. Calculate the amount (g) of acetone that is present in the sample. Molar Mass (g/mol) (CH3)2CO 58.05 C4H8O 72.12 ...

**calculus**

find the area of x^2+x+2 and 3x+3

**Chemistry**

just cross multiply. Since the temperature is the same. x/100torr = .309/60torr

**7th grade**

you are being very lazy. Use the internet, Books even.

**us history**

many possible reasons, main reasons are: 1) communism 2) trade negotiations

**Chemistry**

m means molality

**Chemistry**

it is parts per hundred

**Math**

i got 8.25 it would help if you placed spaces after each addition and subtraction so it would be easier to read.

**math**

Question: I am not sure what you are trying to ask but this sounds like algebra. And this questions seems incomplete. Please post any questions that are part of it. p = unit price in dollar of a rugby shirt 2000-100p = number of unit that he expect to sell R(p) = Total revenue...

**Algebra Word problem**

ans: a) if this is a parabola it would open down. b) since tickets sales would go up because of "hotness" of the show, but eventually it would go down. c)I cannot explain since no equation was given to me d) Peak; the parabola has a maximum point(since it opens down...

**History**

To expand, we would most likely be isolated since US people did not wish to take part directly in foreign affairs.

**calculus**

Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Draw a typical approximating rectangle and label its height and width. y=tan(11x) and y= sin(11x). -pi/33>= x<= pi/33 Then find the area S of the region. (Give an exact ...

**Chemistry**

Solutions are made that contain 0.1 moles of each of the following compounds below in 100 g of H2O. Choose the compound whose solution will have the lowest freezing point. NaBr MgCl2---- KClO3 CO2 MgSO4 I know the answer is MgCl2 but I don't know how to get it. I know I ...

**health**

There are 3 additional reasons why Tele-medicine is advantageous, as noted from UOP material. They are as follows: 1. Reduces the need for small towns to have own set of medical specialists. 2. Patients can stay close to home without having to transfer to major medical centers...

**College Accounting**

how do u find the cost of goods sold for a manufacturing firm

**Plz Help. I am lost!!!Human Anatomy and Physiology**

1. Macroscopic Neurology – trace impulse macroscopically through the nervous system from the brain to the muscle 2. Microscopic Neurology – trace impulse as it passes through the neuron, neuron to neuron, and across the NMJ 3. Sliding Filament Theory explanation 4. ...

**HELP Plz - Introduction to Human Anatomy and Physi**

Situation: You need to step up on a step to reach an object on a high shelf. Instructions: (Part one) Trace the nerve impulse, listing the steps in as much detail as possible, from which your brain sends the message to the appropriate muscles to step up one step. Include the ...

**Application Assignment**

Trace the nerve impulse, listing the steps in as much detail as possible, from which your brain sends the message to the appropriate muscles to step up one step. Include the steps involved in transmitting the impulse from one neuron to another and then to the muscle fiber. ...

**math**

If I have 5 half's an I wanted 3 fourths how many will I have left