Thursday
October 27, 2016

# Posts by Amanda

Total # Posts: 2,446

Chemistry
So q/1.283 = 3841(130.32) I know you have to divide by the molar mass which I found to be 132.169 but Im not sure which number I divide it by.
October 15, 2012

Chemistry
The complete combustion of 1.283g of cinnamaldeyde (C9H8O, one of the compounds in cinnamon) in a bomb calorimeter (Ccalorimeter=3.841 kJ/C) produced an increase in temperature of 130.32 C. Calculate the molar enthalpy of combustion of cinnamaldehydy (delta H comb) (in ...
October 15, 2012

Chemistry
Phthalates used as plasticizers in rubber and plastic products are believed to act as hormone mimics in human. The value of deltaHcombustion for dimethylphthalate (C10H10O4) is 4685 kJ/mol. Assume 1.035 g of dimethylphthalate is combusted in a calorimeter whose heat capacity (...
October 15, 2012

Chemistry
Ok I got the answer!! Thank you!!
October 15, 2012

Chemistry
Ok, yeah I somehow read that as a label not as part of the equation, so 4685*(1.035/194.21)= 24.97 24.97*1000=24967.69 So then would the final equation be: 24967.69=7.293(Tfinal-20.142) Thank you by the way Im just really struggling with this.
October 15, 2012

Chemistry
How do you convert 4848.975 to J?
October 15, 2012

Chemistry
Phthalates used as plasticizers in rubber and plastic products are believed to act as hormone mimics in human. The value of deltaHcombustion for dimethylphthalate (C10H10O4) is 4685 kJ/mol. Assume 1.035 g of dimethylphthalate is combusted in a calorimeter whose heat capacity (...
October 15, 2012

english
I don't know what this one is. Thats why i'm here for help!
October 14, 2012

english
Which one of the following statements is true for the base forms of verb? A. when the subject of a sentence is singular, add "-s" to the base form. B. Add "to" to the base form to create an adjective. C.Do not use a base form with plural subjects. D.Add &...
October 14, 2012

english
In this sentence, what is the antecedent of the pronoun it? A. her B. Carla C.house D.work?
October 14, 2012

english
which sentance contains an incorrect plural? A.The parties ended around midnight. B. If wishes were horses, beggars would ride. C.We spotted the foxs late in afternoon. D.I hate traffic delays.
October 14, 2012

english
A. river
October 14, 2012

english
We left King ranch on a december day in 1873. On the Santa Fe trail, we hit bad weather. The Red river was flooded and it took us four days to get the Cattle across. All in all, it was a hard trail drive, but we got our Longhorns to the railroad at Abilene. Which of the ...
October 14, 2012

Which of the following shound be capitalized? a. river b railroad c drive d weather?
October 14, 2012

Math
Step 1: Find out what 10 to the 5th power is equal to. it = 100,000 Step 2: Multiply 100,000 by 10 Step 3: your answer = 1,000,000
October 11, 2012

chemistry
what is the chemical name and lewis structure of NO3 -2
October 11, 2012

Polynomials
A rock is thrown upward at a speed of 10 metres per second. The height of the rock above the ground is given by the formula h=10t-2.0t². Where h is the height in metres above the ground and t is the time in seconds. Then what is height after 5 second?
October 11, 2012

chemistry
how are the elements in a pair of isotopes the same? how do they differ? And also if you know anything about the atomic structure phrase apeman i could use some serious help right now i have a test tommoro and i cant remember all the material
October 10, 2012

chemistry
a new compound composed of just Hex-Nuts and bolts is formed.A 13.7 Kg sample of the new compound is separated into its component elements with the following result 3.84 kg. of hex-nuts and 9.90 kg of bolts. 1. How many hex-nuts are present in the 13.7 kg sample 2. how many ...
October 10, 2012

bookkeeping
Using your computer, you create a file for an existing costumer. When you're finished, you should a. overwrite the existing file by giving the new file the same name. b. use Save as to save the new file under a different name c. coordinate the old and new files b giving ...
October 9, 2012

Physics
In a head-on collision, a car stops in 0.14{\rm s} from a speed of 24{\rm m}/{\rm s} . The driver has a mass of 67{\rm kg} , and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fraction of a second?
October 5, 2012

math-algebra
one pump can empty a pool in 5 days, wheras a second pump can emtpy pool in 7 days. how long will it take the two pumps, working together, to empty the pool?
October 5, 2012

chemistry
Would you expect a chemical change to be always accompanied by a physical change?Pls. Explain
October 5, 2012

chem
Write the complete ionic equation for Cu(NO3(aq)+K2S(aq)and namd write the formula for the spectator ions in this reaction? This is what I got pls. check it: complete ionic equation: Cu^19aq)+K^1(aq)+S^-2(aq)=K^1(aq)+NO3^-1(aq)+Cu2S(s) net ionic equation: Cu(aq)+s^-2(aq)=Cu2S(...
October 5, 2012

math
Number 6 is actually ( -8, -10). I took the mother F***ing test and got that answer wrong because of you guys.
October 3, 2012

Chemistry
a student conducts and experiment by reacting 39.6g CuSO4 with an excess of MgS. The reaction yields 9.5599g CuS. What is the percentage yield? MgS+CuSO4=CuS+MgSO4
October 3, 2012

Geometry
Find the measure of each angle in a triangle with angles: x, (x-135), and 1/10 x
September 30, 2012

chemistry
A 27.00 mL sample of an unknown H3PO4 solution is titrated with a 0.110 M NaOH solution. The equivalence point is reached when 25.78 mL of NaOH solution is added. What is the concentration of the unknown H3PO4 solution? The neutralization reaction is: H3PO4(aq) + 3NaOH(aq) -&...
September 27, 2012

science
fill in the blank:the ____, the force acting on an object, the greater the acceleration of the object. It is 6 letters and the third letter is R
September 26, 2012

math
A student take in 2,300 calories and burns 2,500 calories. find the net change
September 24, 2012

Algebra
In 2007, Donald's stock portfolio decreased in value by 25%. In 2008, his stock portfolio decreased in value by another 40%. What percentage gain is required in 2009 for Donald's stock portfolio to return to the value it had in the beginning of 2007? (Round to nearest ...
September 24, 2012

english
September 18, 2012

Algebra
Find the distance between the points and the midpoint of the line segment joining them (p,0) (q,0)
September 17, 2012

Algebra
In which quadrants are the sign of first and second coordinates different
September 17, 2012

Algebra
Find x such that point (x,9) is 10 units from (9,3)
September 17, 2012

Geometry
if EF=2x-10 FG=3x-9, and EG=21 find the value of x, EF, and FG
September 16, 2012

Chemistry
Okay, I think I got it! Thanks a bunch :)
September 16, 2012

Chemistry
I have this problem.... Hexane has a density of 0.659 g/ml. How many milliliters (mL) would a student need to pour in order to get 49.5 g of hexane? Am I to solve by using mass = density x volume? And if so, is the answer 32.62mL?
September 16, 2012

i don't understand this math
4 is A those of u who think its c are wrong
September 12, 2012

Algebra 2
2x-y+=-9 3x-8y=-7 using the substitution method.
September 10, 2012

AP Physics
The volume of liquid flowing per second is called the volume flow rate "Q" and has the dimensions of [L]^3/[T]. The flow rate of a liquid through a hypodermic needle during an injection can be estimated with the following equation. Q = pi * R^n (P2 - P1) / 8ηL ...
September 8, 2012

math
500 becuase it takes away a hundred mph with the aerodynamicness
September 7, 2012

Theory to Practice
it would be b because it is one of the biggest obsticles as a begginner
September 7, 2012

mr sus
it will show the teacher that you have fully grasped the entire concept of what has been taught to you.
September 7, 2012

Economics
what exactly ?
September 7, 2012

Chem
What is 1250.37986 with 3 significant figures?
September 6, 2012

Physics
(a) Find the capacitance of a parallel-plate capacitor made of two 5 cm×5 cm square plates separated by 1 mm. (b) If 50 V is applied to this capacitor, how much energy is stored?
September 4, 2012

Physics
Three positive particles of charges 1 μC, 2 μC, 3 μC, and 4 μC, are located at the corners of a square of side 1 cm. Calculate the potential in the center of the square, taking V = 0 at a great distance.
September 4, 2012

Physics
How much work does the electric field do in moving a 2 μC charge from a point with a potential of +20 V to a point with a potential of −20 V?
September 4, 2012

Never mind I figured it out the answer is 67.3614 if anyone needs help
September 3, 2012

A race car is one lap behind the lead race car when the lead car has 57 laps to go in a race. If the speed of the lead car is 66.2 m/s, what must be the average speed of the second car to catch the lead car just before the end of the race (i.e., right at the ﬁnish line...
September 3, 2012

physics
Tammy leaves the oﬃce, drives 43 km due north, then turns onto a second highway and continues in a direction of 30◦ north of east for 80 km. What is her total displacement from the office? and At what angle is her displacement? (Consider east to be 0◦ and ...
September 3, 2012

Math/Chemistry PLS HELP
Find the absolute and percent relative uncertainty and express each answer with a reasonable amount of significant figures. 9.2(+ or -0.7)*(0.0054(+-0.3)+0.0056(+-0.7) The Algebraic answer: 0.1012 Absolute error? Relative error %?
August 30, 2012

Health
The answer is A. Added sugars are sugars and syrups that are added to foods or beverages when they are processed or prepared. This does not include naturally occurring sugars such as those in milk and fruits.
August 30, 2012

Chemistry 314
Five mineral samples of equal mass of calcite, CaCO3 (MM 100.085) , had a total mass of 12.4 ± 0.1 g. What is the average mass of calcium in each sample? (Assume that the relative uncertainties in atomic mass are small compared the uncertainty of the total mass.) (Input...
August 30, 2012

chemistry
A volume of 29.62 ± 0.05 mL of HNO3 solution was required for complete reaction with 0.8896 ± 0.0008 g of Na2CO3, (FM 105.988 ± 0.001). Find the molarity of the HNO3 and its absolute uncertainty. I have the molarity of HNO3 = 0.5667
August 30, 2012

Chemistry
A volume of 29.62 ± 0.05 mL of HNO3 solution was required for complete reaction with 0.8896 ± 0.0008 g of Na2CO3, (FM 105.988 ± 0.001). Find the molarity of the HNO3 and its absolute uncertainty. I have the molarity of HNO3 = 0.5667
August 29, 2012

Chemistry
Five mineral samples of equal mass of calcite, CaCO3 (MM 100.085) , had a total mass of 12.4 ± 0.1 g. What is the average mass of calcium in each sample? (Assume that the relative uncertainties in atomic mass are small compared the uncertainty of the total mass.) (Input...
August 29, 2012

calculus 1
THANK YOU!!!!!
August 27, 2012

calculus 1
If you can program a calculator or computer, estimate the length of the curve f(x) on the given interval using largest n's. f(x)=56cos(x), for x is greater than/equal to 0 and x is smaller than/equal to pi/2.
August 27, 2012

Chemistry 314
What NaCl concentration results when 254 mL of an 0.880 M NaCl solution is mixed with 412 mL of a 0.450 M NaCl solution?
August 26, 2012

Chemistry
I figured it out thanks to related questions.
August 26, 2012

Chemistry
75.0 mL of a 1.80 M solution is diluted to a volume of 258 mL. A 129-mL portion of that solution is diluted using 187 mL of water. What is the final concentration?
August 26, 2012

Chemistry
75.0 mL of a 1.80 M solution is diluted to a volume of 258 mL. A 129-mL portion of that solution is diluted using 187 mL of water. What is the final concentration?
August 26, 2012

Structured English Immersion
How can the continuum of strategies be used inappropriately in the classroom?
August 25, 2012

algebra 2
Tickets for the hamiltons high school's summer play are $3 for students and$5 for non-students. on opening night 937 tickets were sold and $3943 is collected. How many tickets were sold to students? non-students? August 22, 2012 geography A stream has jumped its banks and is starting to flow through a formerly dry prairie. Trees are beginning to take root near the riverbed and are starting to develop a canopy. Explain what you believe will happen to the native grass that has flourished in this spot up until now... August 21, 2012 math You have an aquarium for your new pet, “Shamu” the killer whale, that contains 100,000 pounds of ocean water with a salinity of 30 o/oo. a. Calculate how many pounds of salt are currently in the aquarium. b. You think Shamu may be allergic to salt, so you decide to ... August 21, 2012 Social Studies YES FOR SURE August 15, 2012 Science How gravitational acceleration is used to benefit mankind and the environment. How can rural people also benefit from thr use of gravitational acceleration? August 13, 2012 Health Its d. Reduce daily sodium intake to less than 2,300 milligrams (mg) and further reduce intake to 1,500 mg among persons who are 51 and older and those of any age who are African American or have hypertension, diabetes, or chronic kidney disease. July 28, 2012 Hea;th The answer is D. Currently, many of the foods and beverages Americans eat and drink contain empty calories – calories from solid fats and/or added sugars. Solid fats and added sugars add calories to the food but few or no nutrients. July 28, 2012 SPANISH Change the following constructions to an adjetivo posesivo and noun according to the example: Example: la mesa de ella su mesa 1. el gato de Juan y María 2. las sillas de ti 3. el hermano de mí 4. la computadora de tu y yo 5. la mesa de usted 6. la mesa de ... July 27, 2012 design Have I the write answer so far? 1a 2b 3b 4b 5c 6d 7D 8d July 25, 2012 chemistry What is the molarity of a solution containing 18.0 g of KCl in 354 mL of solution? July 12, 2012 Principles of Management - Strategic Management please review my answers! 1. which of the following is an example of an internal stakeholder of an organization? A) distributors B) suppliers C) Unions D) Individual Workers It is: D) Individual Workers 2. Two drug companies agree to work together to pool their research and ... July 10, 2012 Writeacher maybe you can help ? Principles of Management - Effective Management Are you a business expert? I saw your responses under the business catagory? July 10, 2012 Principles of Management - Effective Management Do you know of a Business Expert on here that could also double check my work? July 10, 2012 MS. SUE HELP! Principles of Management - Effective Management I am trying to enter the corse work today, please help! July 10, 2012 Principles of Management - Effective Management Please double check my answers please! 1. a team manager is resolving the conflicts that exist among the members of his team in an organization. this is an example of: a. planning b. organizing c. leading d. controlling answer C 2. a manager at a grocery store is trying to ... July 10, 2012 College Math Write the mixed number as an imprper fraction. 7 1/9 = A. 64/9 b. 22/3 c. 7/1 d. 65/9 I think the answer is A. July 9, 2012 math If the graph x squared + y squared = c contains the point (-3,5), then c = ? June 18, 2012 Math A line segment begins at point (3,4) and has a length of 13 units. What are the possible endpoints of this line segment? June 18, 2012 Math the perimeter of an equilateral triangle is 50 inches longer than the length of one side. What is the length of one of the sides? June 18, 2012 chemistry how many grams of c2h6o contain the same number of oxygen atoms as 0.75 mol of h2o? June 18, 2012 Math Find how much interest$15,000 earns in 4 years in a certificate of deposit paying 8.5% interest compounded quarterly.
June 13, 2012

vocabulary
June 13, 2012

physics
A rock is tossed straight up with a speed of 29m/s. When it returns, it falls into a hole 13m deep. Solve for rock's velocity as it hits the bottom of the hole. &How long is the rock in the air, from the instant it is released until it hits the bottom of the hole?
June 12, 2012

child care
be able to acquire most of your equipment from free and inexpensive sources
June 8, 2012

Physics
A sheet of siding has a centrally-located doorway of width 2.0 m and height 6.0 m cut out of it. The sheet, with the doorway hole, has a mass of 264 kg. (a) What is the x coordinate of the center of mass? (b) What is the y coordinate of the center of mass? Assume the lower ...
June 3, 2012

Busniess English - Negative and Persuasive Message
Which sentence presents an alternative in appropriate way? a. "The 11 a.m. flight is completely sold out, so I booked you on the 2 p.m. flight. Hopefully that will work for you." b. "We are out of the red units, so we went ahead and shipped you 12 green ones ...
May 31, 2012

Thank you so MUCH!
May 31, 2012

Indicate the alternative that both correctly evaluates the following sentence and correctly explains the reason for the evaluation. "As soon as you provide your date of birth on Line 2, your application for a flexible spending account will be processed." a. Good ...
May 31, 2012

Business English - WRiting to build goodwill
C. Main idea(s), background information, negative elements, benefits, goodwill ending.
May 31, 2012

Business English - WRiting to build goodwill
4. A 11. C 19. B
May 31, 2012

Business English - WRiting to build goodwill
Can someone double check my answers? 1. Which way of askin for action carries the highest level of politeness? A. a polite order B. an indirect request c. a question d. an order answer is: c. a question 2. Which of the following statements most effectively applies you-attitude...
May 31, 2012