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Questions Asked on November 4, 2010

What is the enthalpy for the following reaction?overall: C2H4+H2O--->C2H5OH is -1411kJ correct??
1. 6 answers
2. asked by Angel
3. 10,645 views
Small quantities of hydrogen gas can be prepared in the laboratory by the addition of aqueous hydrochloric acid to metallic
1. 3 answers
2. asked by Anonymous
3. 6,457 views
What is the molecular, ionic, and net ionic equations for Copper(II) sulfate + sodium phosphate?
1. 3 answers
2. asked by Stacy
3. 5,755 views
How much heat, in kilojoules, is associated with the production of 273kg of slaked lime, Ca(OH)2?CaO(s)+H2O(l)-->Ca(OH)2(s)
1. 4 answers
2. asked by Lisa
3. 5,702 views
Balance the equation in aqueous acidic solution:C2O42-(aq) + MnO4-(aq) → Mn2+(aq) + CO2(g) please teach me how to do it!
1. 5 answers
2. asked by sparkle
3. 5,153 views
Heather bought a ten-year maturity corporate bond when it was issued for $1,000. The bond has an annual interest rate of seven
1. 5 answers
2. asked by Ed
3. 5,053 views
what the balanved equation for gaseous sulfur dioxide reacts with water to form aq sulfurous acid (H2SO3)
1. 2 answers
2. asked by nikki
3. 4,936 views
The base dissociation equilibrium constant (Kb) for C5H5N is 1.40×10-9 (eq. 1).(eq. 1): C5H5N(aq) + H2O(l) = OH-(aq) +
1. 1 answer
2. asked by sparkle
3. 4,729 views
a) A plot of lnv vs. lnT should be a straight line. Why?b) What is the slope of the straight line? c) What is the intercept of
1. 2 answers
2. asked by Jerome
3. 4,526 views
The function D(h)=7e^-0.4(h) can be used to determine the milligrams D of a certain drug in a patient's bloodstream h hours
1. 1 answer
2. asked by Hannah
3. 4,239 views
Calculate the pH of a 0.5 M Formic Acid (HCOOH) soln. ka= 0.00018
1. 3 answers
2. asked by Anonymous
3. 3,893 views
What happens to proteins dissolved in water when you heat it to 100 degrees celcius?
1. 1 answer
2. asked by Anonymous
3. 3,723 views
Hydrogen and methanol (CH3OH) have both been proposed as alternatives to hydrocarbon fuels.a) Write balanced chemical equations
1. 1 answer
2. asked by Jarrod
3. 3,353 views
A 1.00-L gas sample at 100°C and 600 torr contains 50% helium and 50% xenon by mass. What are the partial pressures of the
1. 2 answers
2. asked by Anonymous
3. 3,114 views
how many moles of butane gas c4h10 react to produce 3.50moles of water?
1. 3 answers
2. asked by tracey
3. 3,046 views
Consider the equation 3x+5y=k, what values could k so that the x-intercept and y- intercept on the equations graph would both be
1. 7 answers
2. asked by Monkeylover:)
3. 2,980 views
in an element on the periodic table, which number tells you the how many electrons are in that element??
1. 1 answer
2. asked by Jane
3. 2,771 views
What is the enthalpy for the following reaction?C2H4+H2O--->C2H5OH
1. 3 answers
2. asked by Kay
3. 2,616 views
A quadratic function is defined byf(x)= 3x^2+4x-2. A linear function is defined by g(x)= mx-5. what values(s) of the slope of
1. 2 answers
2. asked by priya
3. 2,544 views
A 6 pack of 4oz. containers of yogurt costs $2.99. What is the unit price in cents per ounce? Round to the nearest hundredth of
1. 2 answers
2. asked by m
3. 2,512 views
the speed of the current in Puget Sound is 5 mph. A barge travels with the current 26 miles and returns in 10 and 2/3 hours.
1. 2 answers
2. asked by haley
3. 2,493 views
A 455-g chunk of iron is removed from an oven and plunged into 385g water in an insulated container. The temperature of the
1. 3 answers
2. asked by Rachel
3. 2,444 views
are you a chocolate "purist", or do you like other ingredients in your chocolate? american demographics reports that almost 75%
1. 2 answers
2. asked by Brittany
3. 2,317 views
What can you tell about the meaning of astronaut from its Greek roots?2. What do the latin prefix and root in transmit tell you
1. 1 answer
2. asked by Tracy
3. 2,261 views
The molar mass of a volatile liquid (one which vaporizes easily) can be determined by a the DUMAS METHOD.' In this process a
1. 5 answers
2. asked by D
3. 2,148 views
mount everset is 29,029 feet above sea level. How many yards above sea level is Mount Everest?Would I divide 29,029 by 3? 9,976
1. 6 answers
2. asked by Jill
3. 2,139 views
A lab technician determines the boiling point elevation of an aqueous solution of a nonvolatile, nonelectrolyte to be 1.95°C.
1. 4 answers
2. asked by MaryJ
3. 2,121 views
A solution contains an unknown mass of dissolved silver ions. When potassium chloride is added to the solution, a white
1. 2 answers
2. asked by Brittany
3. 1,997 views
A flat uniform circular disk (radius = 2.10 m, mass = 1.00 102 kg) is initially stationary. The disk is free to rotate in the
1. 2 answers
2. asked by Kevin
3. 1,984 views
If 1.0L of spilled 1M HCl needed to be neutralized using solid sodium carbonate, how many grams of solid would be required?a)53g
1. 2 answers
2. asked by Kelsey
3. 1,955 views
ssm A string trimmer is a tool for cutting grass and weeds; it utilizes a length of nylon "string" that rotates about an axis
1. 1 answer
2. asked by Anonymous
3. 1,845 views
3tan(3x) = sqrt(3)Solve the equation for exact solutions of the interval [0,2pi).
1. 2 answers
2. asked by kyle
3. 1,730 views
A bungee jumper (m = 61.00 kg) tied to a 45.00 m cord, leaps off a 75.00 m tall bridge. He falls to 5.00 m above the water
1. 1 answer
2. asked by LEON
3. 1,685 views
The Rydberg equation, with n1=1, predicts an ultraviolet series of spectral lines of atomic hydrogen. Which of the following
1. 3 answers
2. asked by lavonne
3. 1,671 views
P(x)= -x^3+15x^2-48x+450, x>/3 is an approximation to the total profit (in thousands of dollars) from the sale of x hundred
1. 1 answer
2. asked by Dan
3. 1,633 views
An automobile is traveling 65 km/hr. It brakes decelerate it 6.o m/s^2.a) How long will it take to stop the car? b) How far will
1. 2 answers
2. asked by may
3. 1,615 views
The drawing shows a type of flow meter that can be used to measure the speed of blood in situations when a blood vessel is
1. 1 answer
2. asked by tee
3. 1,605 views
calculate the concentration of a silver ion when the solubility produc constant of AgI is 10 to the power of negative 16
1. 1 answer
2. asked by kim
3. 1,534 views
I THINK SOMEONE HAS THIS SAME QUETION! A massless spring of constant k = 91.0 N/m is fixed on the left side of a level track. A
1. 5 answers
2. asked by Gage
3. 1,499 views
How much would a 75 kg man weigh due to the effect of gravity?
1. 2 answers
2. asked by William
3. 1,478 views
Given the demand function q=173-5p, determine the price where demand has unit elasticity.
1. 1 answer
2. asked by Melissa
3. 1,453 views
A roller-coaster vehicle has a mass of 506 kg when fully loaded with passengers (see figure).(a) If the vehicle has a speed of
1. 3 answers
2. asked by Rose
3. 1,418 views
When heated, CaCO3 decomposes as follows: CaCO3 (s) = CO2 (g) +CaO (s)in an experiment, 10.00 g of CaCO3 was placed in a .500 L
1. 1 answer
2. asked by Rory
3. 1,410 views
the demand for ground chuck(hamburger) in a certain region of the US is given by q= 3.41p^-0.22. is the demand for ground chuck
1. 1 answer
2. asked by Melissa
3. 1,399 views
Element A and element B have bonded and formed compound AB. Which of the following statements is true?A) Compound AB has
1. 2 answers
2. asked by Kaitlin
3. 1,388 views
Kwan has modeled a number that isless than 999. His model has twice as many 100-blocks as 10-blocks. It has twice as many
1. 4 answers
2. asked by guru
3. 1,370 views
a modified U-tube: the right arm is shorter than the left arm. The open end of the right arm is height d = 10.0 cm above the
1. 0 answers
2. asked by Ross
3. 1,366 views
aren't sustainable and renewable kind of the same thing?
1. 0 answers
2. asked by JonG
3. 1,363 views
Can someone help me out here with these two problem? I have know idea where to start.1)The equation: 10(x-1)(x-2)(x-3)=1, has
1. 2 answers
2. asked by REALLY NEED HELP!!!!
3. 1,326 views
Let's say you measure an average acceleration to be 0.4134 ms-2.What is the height (in centimeters) of the riser block? Assume
1. 0 answers
2. asked by Richard
3. 1,322 views
The following equation is given:S2O3 -2 + 2H +1 ---> S + SO2 + H2O [HCl] = 2 mol/L [Na2S2O3]= 0.3 mol/L what is the
1. 0 answers
2. asked by Stephanies
3. 1,321 views
a modified U-tube: the right arm is shorter than the left arm. The open end of the right arm is height d = 10.0 cm above the
1. 0 answers
2. asked by Ross
3. 1,313 views
The ratio of measure 60degrees and 120degrees Is this written as a fraction 1/2 or a ratio 60:120 ?Which is more common? The
1. 2 answers
2. asked by Jill
3. 1,288 views
A mountain drops 90 feet over a horizontal distance of 875 feet. What is the slope of the mountain? Round your answer to two
1. 4 answers
2. asked by franklin
3. 1,283 views
Two ships leave a harbor at the same time, traveling on courses that have an angle of 140 degrees between them. If the first
1. 1 answer
2. asked by Rac
3. 1,275 views
It the perimeter of a square is 40in How many square tiles with 1in sides is needed to cover its area?The area would be 100. so
1. 3 answers
2. asked by Jill
3. 1,273 views
chloroform is an excellent solvent for extraction caffeine from water. Kd = 10 for caffeine in chloroform- water at 25 Celsius.
1. 1 answer
2. asked by jayesh
3. 1,258 views
chloroform is an excellent solvent for extraction caffeine from water. Kd = 10 for caffeine in chloroform- water at 25 Celsius.
1. 1 answer
2. asked by jayesh
3. 1,256 views
How much boiling water would you need in order to raise the bath to body temperature (about 37)? Assume that no heat is
1. 2 answers
2. asked by Bella
3. 1,254 views
Most people think of bamboo as a tree or a bush. Is this transitive or intransitive?think = transitive
1. 2 answers
2. asked by Hannah
3. 1,250 views
1. If it snows tomorrow, I'll not go hiking.2. Because it snows tomorrow, I'll not go hiking. 3. Because it will snow tomorrow,
1. 1 answer
2. asked by rfvv
3. 1,240 views
Balance the equation in aqueous basic solution:ClO3-(aq) + Fe(OH)3(s) → FeO42-(aq) + Cl-(aq)
1. 1 answer
2. asked by sparkle
3. 1,219 views
If 7.50 grams 1-butene reacts with 25.0 g oxygen how many grams of carbon dioxide will form? Which reactant is limiting? How
1. 1 answer
2. asked by rosa
3. 1,191 views
what is EDTA and why is it added to salad dressings and many other processed food stuffs?
1. 1 answer
2. asked by sammy jo
3. 1,182 views
Imagine you are on a local commission appointed to study the lack of proper recreation facilities for youth in your
1. 3 answers
2. asked by jason
3. 1,169 views
suppose you choose a letter at random from the word ARITHMETIC. What are the odds in favor of selecting a vowel? What are the
1. 2 answers
2. asked by Anonymous
3. 1,163 views
I have 7 12 feet of rope and my friend has 3/10 of what we . need to make a jump rope hang up in our back yourd
1. 1 answer
2. asked by math
3. 1,160 views
Write the equation for this situation: the value, v, in hundreds of dollars, of Bob’s stamp collection is 12 dollars more than
1. 1 answer
2. asked by franklin
3. 1,159 views
You have a set of 36 flash cards numbered from 1 to 36. A card is chosen at random. Find the odds in favor of and the odds
1. 2 answers
2. asked by Anonymous
3. 1,145 views
a local office supply store has an annual demand for 50,000 cases of photocopier paper per year. it costs $2 per year to store a
1. 0 answers
2. asked by Melissa
3. 1,141 views
A weight lifter lits a 1250 pound barbell 2 meters in 3 seconds. How much power was used to lift the barbell
1. 1 answer
2. asked by janice
3. 1,140 views
We read a very good Japanese folk tale called "Green Willow."Not sure what the adverb is in this sentence? Is "good" the adverb
1. 5 answers
2. asked by Linda
3. 1,125 views
Organic chemistry:an attempt at synthesizing a certain optically active compound resulted in a mixture of its enantiomers. The
1. 2 answers
2. asked by Tokey
3. 1,124 views
Find the domain of the following rational function.R(x) = -3x^2 / x^2 + 2x - 48 (x+8)(x-6) So the domain is x cannot be 8 or -6.
1. 1 answer
2. asked by Hannah
3. 1,118 views
A spaceship is launched from the Earth's surface with a speed v. The radius of the Earth is R. What will its speed be when it is
1. 2 answers
2. asked by Oscar
3. 1,118 views
A teach chooses a student at random from a class of 10 boys and 15 girls. Find the odds in favor of and the odds against each
1. 3 answers
2. asked by Anonymous
3. 1,117 views
How do you find the logarithmic differentiation of y = x-cos x ?
1. 0 answers
2. asked by Christina
3. 1,115 views
please corret this line.But in fact their actions and words worth nothing; it is their wealth which hides all their weakness.
1. 5 answers
2. asked by sham
3. 1,102 views
Two ships leave a harbor at the same time, traveling on courses that have an angle of 140 degrees between them. If the first
1. 1 answer
2. asked by Rac
3. 1,101 views
Find a degree 6 polynomial with - 8 as a root, no other roots, and in which the coefficient of x^6 is 16. Assume that all
1. 0 answers
2. asked by Eileen
3. 1,090 views
Plot is closely related to _____.authenticity?
1. 5 answers
2. asked by danny
3. 1,073 views
When heated, N2O4 dissociates as follows: N2O4 =2NO2A flask initially contians .560 M N2O4. at this temperature, Kc is 4.00.
1. 2 answers
2. asked by Rob
3. 1,073 views
Predict the weight of a man that is 84 inches tall.
1. 2 answers
2. asked by Sam
3. 1,072 views
A speeding motorist traveling 125 km/h passes a stationary police officer. The officer immediately begins pursuit at a constant
1. 1 answer
2. asked by Whitney
3. 1,071 views
it is not unusual for writers to confuse advers and adjectives how did the material in my writinglab help reduce the possibility
1. 2 answers
2. asked by shelia
3. 1,067 views
How do you find the logarithmic differentiation of y = x^6x?
1. 1 answer
2. asked by Christina
3. 1,051 views
When 20.0 g C2H6 and 60.0 g O2 react to form CO2 and H2O, how many grams of water are formed?
1. 1 answer
2. asked by Jake
3. 1,043 views
A 4 kg block slides down a frictionless incline making an angle of 60° with the horizontal.(a) What is the total work done on
1. 0 answers
2. asked by Jenni
3. 1,030 views
y = |x − 4| + 8Find the x-coordinate of the vertex of the graph. And the y-coordinate of the vertex of the graph. Please help
1. 1 answer
2. asked by HELP
3. 1,028 views
What is the chemical cause of the greens and red colors of aurora borealis (the northern lights)?
1. 1 answer
2. asked by anonymous
3. 1,023 views
A plane climbs into the jet stream which is flowing at a rate of 80 miles per hour. It travels with the jet stream for 5 hours
1. 0 answers
2. asked by Anonymous
3. 1,014 views
what does the word impact mean on a social studies text book?
1. 5 answers
2. asked by kat
3. 1,013 views
In a spontaneous oxidation-reduction reaction between aluminum and silver ion, the aluminum(III) ion and solid silver are
1. 1 answer
2. asked by Kayy
3. 1,006 views
How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 125.0 mL of 0.19 M H2SO4?
1. 4 answers
2. asked by MaryJ
3. 1,006 views
According to the Heisenberg uncertainty principle, if the uncertainty in the speed of an electron is 3.5 x 10(3) m/s, the
1. 1 answer
2. asked by lavonne
3. 1,006 views
Solve this equation3(a+2)+5=2a+4
1. 1 answer
2. asked by Marie
3. 1,005 views
A quadratic function is defined byf(x)= 3x^2+4x-2. A linear function is defined by g(x)= mx-5. what values(s) of the slope of
1. 0 answers
2. asked by priya
3. 1,005 views
what is one disadvantage of drill-and-practice programs?
1. 1 answer
2. asked by carlo
3. 988 views
help me please What is the smallest solution to the inequality 4 (x -1) > 16?
1. 2 answers
2. asked by jazz
3. 987 views
A fence is to be built to enclose a rectangular area of 210 square feet. The fence along three sides is to be made of material
1. 2 answers
2. asked by Anonymous
3. 982 views

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