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August 30, 2015

Posts by Melissa


Total # Posts: 1,164

Chemistry
I'm not to sure what you mean by "the same"
February 8, 2011

Chemistry
If a saturated solution prepared by dissolving solid BaSO4 in water has [Ba2+]= 1.04*10^5M, what is the value of Ksp for BaSO4?
February 8, 2011

Biochemistry
Complete hydrolysis of 25 mM ethyl acetate in an enzyme esterase catalyzed reaction is carried out in a 40 mM NaCl solution buffered by 0.2 M Tris-Cl, pH 9.1. What is the pH at the end of the reaction? (For Tris base, which is the abbreviation for Tris (hydroxymethyl) ...
February 7, 2011

math
Angle U and Angle V are complementary angles. If Angle U is three less than twice Angle V, what are the measures of the angles?
February 6, 2011

Math-Equations
I haven't posted this before. I've been working on this for 2 days and I didn't search the website for this problem again today. Someone else must have posted it. I just couldn't figure out the equations. Thanks anyway.
February 6, 2011

Math-Equations
A building contractor is planning to build an apartment complex with one, two or three bedroom apartments. Let x,y,z respectively denote the number of apartments of each type to be built. Suppose that the builder will spend a total of $6,885,000, and that the costs for the ...
February 6, 2011

Chemistry
A 119.2mL sample of 0.105M methylamine (CH3NH2, Kb=3.7*10^-4) is titrated with 0.255M HNO3. Calculate the after the addition of each of the following volumes of acid. 49.1mL and 73.6mL. Please help.
February 6, 2011

Chemistry
A 23.0mL sample of a diprotic acid is titrated with 0.260M KOH. If 55.5mL of base is required to reach the second equivalence point, what is the concentration of the acid? I'm not sure how to do this.
February 6, 2011

Algebra
The area of the top of a triangular corner desk must be at least 7 sq. ft. If the base of the triangular desk top needs to be four feet, what should the height be?
February 6, 2011

new age math
Please someone help
February 6, 2011

new age math
A value of the number k for which there is either no solution or an infinite number of solutions for (y,v) to the system of equations show below 7y-9v=-9 Ky+7v=7
February 6, 2011

geometry
if 32 degrees is less than three times its supplement, how large is the angle?
February 5, 2011

AP Chem
I figured out the first part but don't understand the second part still. I looked at the response you had for someone else, but still couldn't get the right answer.
February 2, 2011

AP Chem
The formula for epson salts is MgSO4*7H2O. If 1.250 g of the compound is dissolved in water, calculate the number of milliliters of 0.200 M Ba(NO3)2 that would be required to precipitate all of the sulfate ions as barium sulfate. Make the same determination for 1.000 g of alum...
February 2, 2011

English
How can I rewrite this sentence: A boy and his bog sat by a house?
February 2, 2011

math
joseph is planning a 2500 mile cross-country trip in his new sports utility vehicle. he uses the following information about his vehicle to figure out how much money to budget for gas: . the vehicle has a 15 gallon tank . the vehicle gets 25 miles per gallon if the gasoline ...
January 31, 2011

math
sandra is making 3 gallons of lemonade reception.If each scoop of powdered lemonade mix dissolves in enough water to make 3 quarts of punch,how many scoops of powdered mix will she use? ( hint: 4 quarts = 1 gallon
January 31, 2011

Supply/Math
The suppliers will supply 3,300 units if the price is $350.00 and 3,800 units if the price becomes $410.00. Then the linear supply equation is p = ? s + ? .
January 30, 2011

math
The question says .. match the equivalent addition and subtraction expressions a) -6 -9 b)-10 - (-12) c)6-9 d)10-12 e)-12-10 A)10+(-12) B)-6+(-9) C)-12 + (-10) D)6+(-9) E)-10+12
January 26, 2011

math
The question says .. match the equivalent addition and subtraction expressions a) -6 -9 b)-10 - (-12) c)6-9 d)10-12 e)-12-10 A)10+(-12) B)-6+(-9) C)-12 + (-10) D)6+(-9) E)-10+12
January 26, 2011

Place Value
Choose between the numbers 0, 2, 3, 4, 5, and 6 to make the largest four digit natural number in terms of value that you can. The number 078 has two digits. The number 00045 has two digits. Choose between the same numbers to make the smallest four digit number in terms of ...
January 19, 2011

physics
Find a vector with a magnitude of 1.00 that bisects the angle between the vectors 5.00i + 11.0j and 2.00i − 1.00j. Give your answer in rectangular coordinates. Please explain how you arrived at the solution. Thanks!
January 19, 2011

Algebra
Using the following six digits, 1, 2, 4, 6, 8, and 9, fill in the blanks below to make the maximum product that you can. Use each digit only once. How does an understanding of place value help determine the best solution to this problem?
January 17, 2011

economics
what are the non-monetary benefits of growing tobacco, of working as a plumber's assistant, and of working as a carpenter during the spring and summer and storing travel trailers for a local campground and selling oysters during the fall and winter?
January 17, 2011

Principles of Macroeconomics
What are the non-monetary benefits of growing tobacco, of working as a plumbers assistant, and of working as a carpenter during the spring and summer and storing travel trailers for a local campground and selling oysters during the fall and winter?
January 17, 2011

physics
How many uniform, identical textbooks of width 25.0 cm can be stacked on top of each other on a level surface without the stack falling over if each successive book is displaced 3.00 cm in width relative to the book below it? If the books are 5.00 cm thick, what will be the ...
January 16, 2011

statistics
For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size 3
January 10, 2011

Math: Algebra 2
Factor Completely with respect to the intergers. 2x^3-3x^2+4x-6
January 9, 2011

physics
Two masses are suspended from a pulley as shown in the figure below (the Atwood machine). The pulley itself has a mass of 0.20 kg, a radius of 0.15 m, and a constant torque of 0.35 m·N due to the friction between the rotating pulley and its axle. What is the magnitude ...
January 9, 2011

physics
well i dont really know how to explain the first part sorry.. but a negative acceleration for a car means the car is stopping.
January 9, 2011

social studies
thanks for all the help!!!(:
January 8, 2011

social studies
no i am not
January 8, 2011

social studies
how do you learn how to cook or do a job in medieval times? how do u get the job to be a cook in medieval times?
January 8, 2011

social studies
how many outfits did cooks have in the medieval times
January 8, 2011

social studies
but how do people treat the cook in medieval times
January 8, 2011

social studies
how do people treat cooks in medieval times
January 8, 2011

social studies
how often do cooks in medieval times speak to the lord?
January 8, 2011

social studies
can cooks in medieval times get married and if so who to?
January 8, 2011

social studies
what would the materials be as a cook in medieval times?
January 8, 2011

social studies
in medieval times as a cook where on the manor estate is your shelter
January 8, 2011

social studies
how do cooks get a job in medieval times?
January 8, 2011

social studies
who would cooks in medieval times work for?
January 8, 2011

social studies
where did people work if they were a cook in medieval times
January 8, 2011

math
a.u.s nickel contains 3.9g of copper and 1.2g of nickel. how many kilograms of copper must be combined with 500 kg of nickel to make nickel coins?
January 8, 2011

Grammar
omg thank u soooooooooooo much
January 6, 2011

physics
A rope goes over a circular pulley with a radius of 6.3 cm. If the pulley makes four revolutions without the rope slipping, what length of rope passes over the pulley?
January 5, 2011

Economics
explain why the cost tructure associated with many kinds of information goods and services might imply a market supplied by a small number of large firms. At the same time, some internet businesses such as grocery home deliveries have continually suffered steeplosses ...
January 2, 2011

Math
Mark each of the following True or False. ___ a. All vectors in an orthogonal basis have length 1. ___ b. A square matrix is orthogonal if its column vectors are orthogonal. ___ c. If A^T is orthogonal, then A is orthogonal. ___ d. If A is an n*n symmetric orthogonal matrix ...
January 2, 2011

Spanish
Thank you-I understand it now more clearly
December 21, 2010

Spanish
How do I say I'm wearing black pants? "Llevo pantalones negro." or do I have to add an "s" to negro? Thank you
December 21, 2010

Spanish
Could someone help me please? Which of the following says "some strong men" in Spanish los hombres fuertes unos hombres fuertes I think it is unos hombres fuertes becuase the los hombres fuertes states the strong men, doesn't it
December 21, 2010

physics
Four identical masses of 2.7 kg each are located at the corners of a square with 1.4 m sides. What is the net force on any one of the masses?
December 19, 2010

physics
someone pleaaaase answer my question! i have no clue how to do it!
December 19, 2010

physics
A 70 kg man weighs 686 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 14% of his body weight?
December 19, 2010

Physics
A 3.90×10^2kg cube of ice at an initial temperature of -18.0degreesC is placed in 0.480kg of water at 41.0degreesC in an insulated container of negligible mass. Calculate the change in entropy of the system. I found the equilibrium temperature to be at 304.9K, then used ...
December 7, 2010

chemistry
what is the molarity of 275mL of a solution containing 23.83 mg of Mg Cl(2)<small 2
December 3, 2010

Statistics
A group of doctors is trying to see if a vaccine causes a certain type of disease. They take individuals with the certain disease and individuals without the disease. They then use research to estimate the relative incidence of the onset of the disease after the vaccination. ...
December 3, 2010

physics
An air puck of mass m1 = 0.45 kg is tied to a string and allowed to revolve in a circle of radius R = 1.0 m on a frictionless horizontal table. The other end of the string passes through a hole in the center of the table, and a mass m2 = 1.10 kg is attached to it. The ...
November 30, 2010

physics
A light spring of spring constant k = 160 N/m rests vertically on the bottom of a large beaker of water. A 5.00 kg block of wood (density D = 700 kg/m3) is connected to the spring, and the block ? spring system is allowed to come to a static equilibrium
November 30, 2010

Chem
what mass of calcium oxalate can be dissolved in 180 ml of distilled water before a precipitate forms?
November 29, 2010

statistics
In one history class, 34 students took an exam. The mean of the exam was 52 with a standard deviation of 13. If the instructor is going to assume data are normally distributed and assign grades on a curve, then she will assign an A to the top 10% of the class, B's to the ...
November 29, 2010

english
At my son’s very first softball game his team did not do very well. No one seemed to be able to hit the ball or run the bases when they were up to bat. When they were in the field they would either run from the ball or be nowhere near it when they attempted to catch it. ...
November 29, 2010

science
What are the hard and fast rules of Science, if any?
November 24, 2010

6th grade
Each letter in each questio stands for a 1-digit number. in each question, no two letters maystand for the same number. Two separate problems are unrelated.Find a value for each letter MOON Use Numbers 4,7,5,6,2.8,9,3 x AT ____ ACROSS
November 21, 2010

chemisty
what is the molarity of ZnCl2 that forms when 30.0 g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL. Zn(s) + CuCl2(aq)--> ZnCl2(aq) + Cu(s)
November 20, 2010

U.S history
My two colonies are New Jersey and Pennsylvania.How are they similar and how are they different?Which one would you live in,and why?
November 18, 2010

us history
Think about two colonies.How are they similar?How are they different?Decide which colony you would like to live in.
November 18, 2010

physics
I know this has been posted many times but I keep trying and cannot get the right answer, A place kicker must kick a football from a point 39.9 m from a goal. As a result of the kick, the ball must clear the crossbar, which is 3.05 m high. When kicked the ball leaves the ...
November 17, 2010

physics
I know this has been posted many times but I keep trying and cannot get the right answer, A place kicker must kick a football from a point 39.9 m from a goal. As a result of the kick, the ball must clear the crossbar, which is 3.05 m high. When kicked the ball leaves the ...
November 17, 2010

calculus
Have you found an answer yet?
November 16, 2010

Math
I figured it out 1 gallon = 8 pints and to figure the 3/4. you take 3/4 x 8/1= 24/4 and that = 6. so 6+8=14
November 16, 2010

Math
nick has 1 3/4 gallon of milk how many pints does nick have. I think it is 14.
November 16, 2010

Algebra
Consistent and independent?
November 13, 2010

Algebra
3x-9y=63 2x-6y=-18 Solve system of equations by graphing then classify as Independent on dependent and consistent or inconsistent?
November 13, 2010

Algebra
I still don't understand?
November 13, 2010

Algebra
One canned juice is 20% orange juice: another is 10% orange juice. How many liters of each should be mixed together in order to get 10L that is 13% orange juice.How many liters of the 20%? How many liters of the 10%?
November 13, 2010

Chemistry
Ethanol burns to produce 1300.0 kJ/mol and has a heat capacity of 65.6 J/mol·K. If Dr. Porter has 1.00 L of liquid ethanol (density = 0.789 g/mL), what is the minimum mass of fuel that should be removed and burned to heat the remaining ethanol from 25 °C to 90 °...
November 9, 2010

Chemistry
Hydrofluoric acid etches glass by reacting with the silica in it according to the following equation. H° = 54.5 kJ and S° = 436.5 J/K Calculate G° at 25°C for this reaction.
November 9, 2010

Physics
Newton's third law says that for every action there is an opposite and equal reaction. Does that mean that the the average thrust force the gas exerts on teh engine and rocket would each be 5 N?
November 7, 2010

Physics
A typical model rocket engine exerts an average force of 5 N on its exhaust gas. How much average thrust force does the gas exert on the engine and rocket?
November 7, 2010

Chem
2 H2O (l) → 2 H2 (g) + O2 (g) Using the thermodynamic values to calculate accurate values of ΔHr and ΔSr, will the reaction be product favored at high temperature? Why? r stands for reaction
November 5, 2010

Chem. only regarding formula.
how do do calculate ΔHr and ΔSr?
November 5, 2010

Chem. thankss!!!
1.0 mol of water (c=4.184 J/g.oC), 1.0 mol of ethanol (c=2.46 J/g.oC), 1.0 mol of carbon tetrachloride (c=0.861 J/g.oC), and 1.0 mol of ethylene glycol (c=2.42 J/g.oC) at 50oC were each placed into a separate coffee cup calorimeter and the temperature recorded. The temperature...
November 5, 2010

Chem
In an experiment 50 g of a metal was heated to 100oC and placed in 200 g of a liquid at 25oC. Which of the following combinations of metal and liquid will produce the largest temperature increase in the liquid? (Assume that there is no energy transfer to the surroundings.) ...
November 5, 2010

CHEM.
Zinc is often used to calibrate calorimeters because it undergoes a very sharp phase transition from the solid to the liquid at 419.5oC. Calculate the enthalpy change when 5 g of zinc metal is heated from 100oC to the point where the entire sample is melted. (The heat of ...
November 5, 2010

CHEM. help please
Consider a system of 3 molecules, A, B, and C. Suppose the 3 units of energy can be distributed over the three atoms where each atom can have no energy, one unit, two units or 3 units of energy. Assume each of the 10 possible arrangements is equally probable. What's ...
November 5, 2010

Chem Help please
Consider a system of 3 molecules, A, B, and C. Suppose the 3 units of energy can be distributed over the three atoms where each atom can have no energy, one unit, two units or 3 units of energy. Assume each of the 10 possible arrangements is equally probable. What's ...
November 5, 2010

Calculus
Given the demand function q=173-5p, determine the price where demand has unit elasticity.
November 4, 2010

Calculus
Given the demand function q=173-5p, determine the price where demand has unit elasticity.
November 4, 2010

Calculus
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 elastic or inelastic
November 4, 2010

Calculus
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 case of photocopier paper, and it costs $50 to place an order. Find the optimum number of cases of photocopier paper per order
November 4, 2010

CHemistry
Use the bond energies given in the "Bond Energy" table (can be gained from google) to estimate the delta Ho for the reaction given below. 2ClF3(g) + 2O2(g) Cl2O(g) + 3OF2(g) I did this: 1530 + 996 - (410 + 570) = 1546. But the answer was wrong. I dont know where I ...
November 2, 2010

Chemistry
Use the bond energies given in the "Bond Energy" table (can be gained from google) to estimate the delta Ho for the reaction given below. 2ClF3(g) + 2O2(g) Cl2O(g) + 3OF2(g) I did this: 1530 + 996 - (410 + 570) = 1546. But the answer was wrong. I dont know where I ...
November 2, 2010

Chemistry- helpp!
The equation for synthesis of the poisonous gas COCl2 is CO(g) + Cl2(g)COCl2 If 43.2 kJ of energy is evolved when 39.5 g of COCl2 is synthesized, what is the molar enthalpy for this synthesis? THANK YOU!
November 2, 2010

Chemistry
Calculation of the sodium chloride (NaCl) content and evaporation: 1. The amount of sodium chloride in the original mixture may be determined indirectly by adding the masses of ammonium chloride and sand together and subtracting the sum from the initial sample mass of 10g. 2. ...
October 23, 2010

Chemistry
I am doing a lab online and have no clue on how to get started with the following questions? Please Help me! 1. Calculate and record the following (in grams): (a) mass of NaCl by subtraction of other components: (b) measured mass of NaCl after boiling away water: 2. Calculate ...
October 23, 2010

chemistry
What volume (in Liters) of hydrogen must react to form 17.0L of ammonia according to the following balanced equation: N2(g) + 3H2(g) --> 2NH3(g) Ratio from equation is H : NH3 = 3 : 2 = 3/2 : 1 = 17x3/2 : 17 = 25.5 : 17 17 L of hydrogen can you check my work is this right?
October 17, 2010

college chemistry
so it would be (1)(.0036)=n(.0821)(273)?
October 17, 2010

college chemistry
A volume of 0.285 L of a gas at STP weighs 0.537 g. Calculate the molar mass of the gas (1)(0.285) = n(0.0821)(273). .0036 is this correct?
October 17, 2010

English
make 2 words, first one 8 letters and second work 4 letters out of these s l r t n r u p a e s a
October 17, 2010

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