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December 21, 2014

Search: Composition

Number of results: 1,074

Chemistry
How do you determine the percent composition by mass of a 100 g K2SO4 solution containing a 20-g solute. What is the mole percent composition of the solute, assuming that the solution consists of 100 g water and 20 g of K2S04? For percent composition of K2S04, I got 44.9 % K, ...
June 23, 2009 by Sofia

Science
full composition that explains the composition of the earth’s layers
April 22, 2011 by Anonymous

Chemistry-II (Percent Composition)
1. Identify the percent composition of sodium carbonate. 2. Determine the percent composition of calcium in calcium carbonate. Pls. help me... my prob is that there is something in the solution that bothers me.. pls.kindly show me how to do.. i'll thank u later... :)
January 23, 2013 by jezzaD.

music
name and define three rhythmic elements that composers could use in their composition. Show how each would affect the overall sound of the composition? thank you
January 30, 2013 by justastudent

CHEMISTRY
What type of reactant typify compostion reactions? You need to clarify your question for me. I haven't heard of composition rreactions. Perhaps I know it by another name. In the real world, there is no "typical" reactant in composition reactions. In the construct world of ...
December 16, 2006 by PLEASE HELP

english
Suppose you are exploring a subject for a composition. Which one of the following methods would help you find relationships among various aspects of a subject. A. Journaling B. Freewriting C. Pentad D. Listing http://grammar.ccc.commnet.edu/grammar/composition/...
July 22, 2006 by mubashir

chemistry
In which of the following ways would you change the glass sample to make the ion exchange more efficient? a)Change the composition of the glass to increase the proportion of B2O3. b)Change the composition of the glass to add Na2O, Li2O, or MgO. c)Change the composition of the ...
April 10, 2013 by Anonymous

OChem
A solution consisting of water and ethanol is found to have a refractive index of 1.3541 at 20 degrees C. The refractive indices at 20 degrees C of water and ethanol are 1.3330 and 1.3610, respectively. Determine the molar composition (in percent) of the mixture by assuming a ...
October 26, 2011 by Omar

composition and communication 1
i need to know how to write five sentences in which you address how your writing has changed in the first four weeks of class. the classis composition and communication 1
October 11, 2010 by sarah

maths
A composition of the number n is an ordered set of integers a1,a2,…,ak such that a1+a2+⋯+ak=n. The numbers a1,a2,…,ak are called the parts of the composition. Determine the number of compositions of 23 where each part is at least 4.
July 18, 2013 by kk

math
A composition of the number n is an ordered set of integers a1,a2,…,ak such that a1+a2+⋯+ak=n. The numbers a1,a2,…,ak are called the parts of the composition. Determine the number of compositions of 23 where each part is at least 4.
July 18, 2013 by kk

mathsddddddddddddddddddddddddddd
A composition of the number n is an ordered set of integers a1,a2,…,ak such that a1+a2+⋯+ak=n. The numbers a1,a2,…,ak are called the parts of the composition. Determine the number of compositions of 23 where each part is at least 4.
July 18, 2013 by shayan

Chemistry
I'm supposed to compare the percent composition of gases in the atmosphere at sea level to the percent composition at high altitude.. Would the percents decrease? I don't really understand
January 16, 2013 by Sara

calculus
Suppose that the number of bacteria in a plate of food is given by N(T)= 10T^2 - 40T + 200, -1<=T<=20 where T is the temperature of the food in degrees Celsius. Suppose that the temperature of the food when it is left out on a picnic table is given by T(t)= 4t + 10, 0<...
September 23, 2014 by Anonymous

calculus
Suppose that the number of bacteria in a plate of food is given by N(T)= 10T^2 - 40T + 200, -1<=T<=20 where T is the temperature of the food in degrees Celsius. Suppose that the temperature of the food when it is left out on a picnic table is given by T(t)= 4t + 10, 0<...
September 23, 2014 by Anonymous

Chemistry 11
Find the percent composition of a compound containing sodium and chlorine if 24.34g of the compound contains 13.45g of sodium. My work: Molar mass of NaCl: MNa +MCl = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol Percent composition of Na: 22.99 g/mol / 58.44 g/mol x 100 = 39.34% Na...
November 12, 2014 by Christina

Chemistry
For :H2O(g) --> H(g) + OH(g); At 3000K and P(total)=1.00 atm, from your K value calculate system composition from 1.00 mol H2O(g) and no products initially. The K I got (using Delta G superscript zero = [Delta H superscript zero]-[T* Delta S superscript zero)=]) was 9.5x10...
July 31, 2014 by Briana

chemistry
1.to calculate the percent by massof an element in a known compound, divide the mass of the element in one mole by the _______and multiply by 100%. A(n) _______formula represents the lowest________ratio of the elements in a compound. It can be calculated from a compond's ...
March 24, 2009 by Anonymous

Algebra II
The inverse of f(x) is h(x). The composition of f and h is written f[h(x)]. What does f[h(x)] equal? Hint: Think of a simple problem like f(x) = x + 3. Then the inverse, h(x) would be h(x) = x - 3. What would the composition f[h(x)] equal in this example? f(h) means the ...
July 23, 2007 by Ben

Government
The constitution has comparatively little to say about the structure and composition of the supreme court. Identify two aspects of the court's structure and composition that the constitution does not specify.
August 12, 2009 by Cherokee

algebra
Find two functions, f and g, to express the given function (y = [4/(x-3)] + 1) in each way shown below. Sum Product Quotient Composition I got the sum and the composition, but I can't figure out the product and the quotient. Any help is appreciated, thanks!
January 19, 2011 by Anonymous

organic chemistry
Determine the percent composition of your unknown mixture. My data for refractive indexes for acetone is 1.365 and water is 1.330. This is what my unknown mixture was composed of. How do I use this info to find percent composition of each compound?
November 8, 2008 by Jenn

science
one way of describing population distribution is the number of people per area, but it can also refer to a)the hybridization composition of the people b) the age distribution of the people c) the political composition of the people d) the hydrographic features e) all of the ...
September 8, 2010 by pam

Chemistry
Is the following a physical or chemical separations: salt water --> water+ sodium chloride Do you change the composition of the water? Do you change the composition of the salt. I can't say which because you don't tell me how you separated them. For example, if I ...
September 9, 2006 by George

Biochemistry
Just need help. Question: One strand of DNA is completely transcribed into RNA by RNA polymerase. The base composition of the DNA template strand is: G =20%. C=25%, A=15%, and T=40%. What would you expect the composition of the newly synthesized RNA to be?
October 2, 2009 by James

chemistry
Consider two glasses. Glass A has a composition of 100% SiO2. Glass B has a composition of 25% Na2O - 75% SiO2. (a) Which sample has a shorter average bond length (r)? (b)Which sample has a higher thermal expansion coefficient? (c) Which sample has a lower viscosity?
April 10, 2013 by Anonymous

chemistry
Calculate the % composition of H2S. Then determine the number of grams of sulfur present in 339.79 g of H2S. *I don't know how to set up the equation after I find the % composition to find the grams of sulfur. Please help! Thanks, Bella :)
November 22, 2013 by Bella

Chemistry
Calculate the % composition of H2S. Then determine the number of grams of sulfur present in 339.79 g of H2S. *I don't know how to set up the equation after I find the % composition to find the grams of sulfur. Please help! Thanks, Bella :)
November 22, 2013 by Bella

Science
Calculate the % composition of H2S. Then determine the number of grams of sulfur present in 339.79 g of H2S. *I don't know how to set up the equation after I find the % composition to find the grams of sulfur. Please help!
November 22, 2013 by Cassie

English
Need help with this assignment. Please and thanks. The first composition should be about making a decision. Since this will be a narrative piece of writing, chronological order will probably work best. The second composition will be about the American way of life. In it, ...
August 9, 2013 by Nick

Chem
A sample of 2-butanol has a specific rotation of 3.25. Determine the % ee and molecular composition of this sample. The sepcific rotation of pure (+)-2-butanol is +13.0. is it (3.25/13.0)x100%= 25%... i'm a little confused on the molecular composition though.
November 18, 2008 by Jason

chemistry
help please, have no clue how to solve this. (a) you are given a mixture containing two compounds, A and B. both compounds have a solubility of 1g/100mL of solvent at 20 deg C and 16g/100mL of solvent at 100 deg C. The sample is composed of 3.5 g of A and 10 g of B. at 100 deg...
February 11, 2013 by shelby

Ochem
A student needed to determine the percent composition of a mixture that contained fluorene and benzoic acid. The student took 283 mg of the mixture and used the extraction method to separate the components. Then both compounds were recrystallized and dried. The experiment ...
October 19, 2011 by Lindsay

ochem
A sample of Limonene has a specific rotation of +76.9. What is the % ee and molecular composition of this sample? R(+)- is +125.6 and S (-)- 122.1. I'm confused I don't know whether I should divided by 125.6 or 122.1. %ee=(76.9/125.6)*100=61%. Is this correct? I'm clueless as ...
November 13, 2010 by bjisa

chemistry
Glass A has a composition of 90% SiO2 - 10% Na2O. Glass B has a composition of 99% SiO2 - 1% Na2O. Both glasses are cooled to room temperature at the same rate. (a) Which glass has the higher Tg? Glass A Glass B (b) Which glass has the lower free volume?
April 26, 2013 by Anonymous

English composition
I bought a pedometer on the Auction site on-line, so I can measure my steps. If I walk for 10,000 steps a day, it will be helpful for my health. This product was made in China, and it is 1,500 won. It is inexpensive. Because I can check how many steps I can walk, it will be ...
January 3, 2008 by John

Percent Composition
I figured out this percent composition problem and I got REALLY close answers, so I wanted to check in with someone to confirm if this is right. Which is the better ore for mining Aluminum: Either Al2(CO3)3 or AlPO4? For me the first one was the better percentage (22.85%) but ...
April 21, 2009 by Jenn

Percent Composition
I figured out this percent composition problem and I got REALLY close answers, so I wanted to check in with someone to confirm if this is right. Which is the better ore for mining Aluminum: Either Al2(CO3)3 or AlPO4? For me the first one was the better percentage (22.85%) but ...
April 21, 2009 by Jenn

Chemistry
Give three substances with different structures and different chemical composition and explain why they are different from each other. If possible, give the chemical composition or formula of the substances. Thanks.
June 25, 2013 by Perrie

Chemistry
During a fractional distillation of a 25mL ethanol/H2O soln, it was found that first the temperature stayed constant at ~75 C for 3mL of soln, then it went up to 100 C for the rest of the soln. The first question is: Assuming that the unknown (ethanol) did not form an ...
February 1, 2012 by Johnny

Chem
Give three examples each of household items that have: a. different structures and exhibit different properties b. same chemical make-up composition but a different structure, hence, different properties c. the same properties but with different chemical composition
July 11, 2013 by Eliza

chemistry
This is a lab question...I don't understand how to do it. A solution consisting of isobutyl bromide and isobutyl chloride is found to have a refractive index of 1.4194 at 20 degrees celsius. The refractive indices at 20 degrees celsius of isobutyl bromide and isobutyl chloride...
November 11, 2009 by Kay

OCHEM
A student needed to determine the percent composition of a mixture that contained fluorene and benzoic acid. The student took 245 mg of the mixture and used the extraction method to separate the components. Then both compounds were recrystallized and dried. The experiment ...
August 12, 2012 by Jen

Science - Chemistr++++++++++++++++++++++++++++++++
List materials that are commonly found at home or in school that have: a. Different structures and exhibit different properties b. The same chemical make-up (composition) but with different structures, hence, different properties c. The same properties but with different ...
June 24, 2013 by Annika

Science-Chemistry
List materials that are commonly found at home or in school that have: a. Different structures and exhibit different properties b. The same chemical make-up (composition) but with different structures, hence, different properties c. The same properties but with different ...
June 24, 2013 by Annika

biology
what salts are present in the composition of human sweat. Find out what elements are present in the composition of human sweat and what salts are formed by these elements.
October 11, 2011 by Anonymous

chemistry
Consider two glasses. Glass A has a composition of 5% CaO - 95% B2O3. Glass B has a composition of 15% CaO - 85% B2O3. Both samples are cooled from their molten state to room temperature at rates that result in an identical glass transition temperature. Given this information...
April 10, 2013 by Anonymous

chemistry
Consider two glasses. Glass A has a composition of 5% CaO - 95% B2O3. Glass B has a composition of 15% CaO - 85% B2O3. Both samples are cooled from their molten state to room temperature at rates that result in an identical glass transition temperature. Given this information...
April 12, 2013 by adex

Chemistry
Give three examples each of household items that have: a. different structures and exhibit different properties b. same chemical make-up composition but a different structure, hence, different properties c. the same properties but with different chemical composition (If ...
July 11, 2013 by Eliza

science - magma
Magmas which have different chemical compositions have different temperatures i.e basaltic magmas erupt at about 1200 °C whereas rhyolitic magmas erupt at about 700 °C. what is the difference in chemical composition between these two? also why can the composition of magma ...
March 28, 2011 by rebecca niles

Function compostions
Sorry I had to repost, I left somethings out. Can you please check my answers? For the given functions f and g, find the indicated composition. 5. f(x)=7x+9, g(x)=2x-1 Find (f *g)(x) I got 14x+2 For the given functions f and g, find the indicated composition. 8. f(x)=-5x+3, g(...
September 15, 2007 by Soly

chemistry
sometimes,instead of percentage composition, you will have the composition of a mass sample. using the actual mass of the sample, determine the empirical formula for compounds that have the following analyses. b. a 13.07g sample of an unknown substance is composed of 9.48g of ...
February 23, 2013 by tula

Genetics
A viral DNA is analyzed and found to have the following base composition, in mole percent: A = 32, G = 16, T = 40, C = 12. What can you immediately conclude about this DNA? a stretch of double stranded DNA contains 1000 base pairs and its base composition is 58 % (G + C). How ...
September 17, 2009 by Anonymous

English Composition
I'm writing a synthesis paper for my college english composition class. My topic is: The relationship between social class and public education. So far, my thesis: My argument is that students in public education should not be discriminated against based on what social class ...
June 25, 2009 by Summer

Physical Chemistry
"Liquids A and B, which have identical molar volumes, are mixed together in equal volumes to form a 75 mL mixture. The liquids are partially miscible and the mixture phase separates into an upper phase with a composition xA=0.45 and a lower phase with a composition xA=0.82. ...
November 19, 2012 by Emily

chemistry
Shown below is a schematic representation of the water-ethanol phase diagram. Making reference to the phase diagram, explain in a few sentences how one could enrich a solution of 15 percent ethanol - 85 percent water to a composition of 60 percent ethanol - 40 percent water. ...
December 21, 2012 by C

Functon compostions
Can you please check my answers? For the given functions f and g, find the indicated composition. 5. f(x)=7x+9, g(x)=2x-1 I got 14x+2 For the given functions f and g, find the indicated composition. 8. f(x)=-5x+3, g(x)=6x+3 I got -30x+18 Find functions f and g so that h(x)= (f...
September 14, 2007 by Soly

Chemistry
Answer the following questions by referring to the Cu-Al phase diagram shown below. (a) What is the lowest temperature at which a liquid can be found in a system of any composition of Cu-Al ? (b) A common alloy composition used in airplanes is 4 at. % Cu - 96 at. % Al. For ...
December 11, 2012 by Odesa

Chemistry
Answer the following questions by referring to the Cu-Al phase diagram shown below. (a) What is the lowest temperature at which a liquid can be found in a system of any composition of Cu-Al ? (b) A common alloy composition used in airplanes is 4 at. % Cu - 96 at. % Al. For ...
December 13, 2012 by Ling

Chemistry
Answer the following questions by referring to the Cu-Al phase diagram shown below. (a) What is the lowest temperature at which a liquid can be found in a system of any composition of Cu-Al ? (b) A common alloy composition used in airplanes is 4 at. % Cu - 96 at. % Al. For ...
December 15, 2012 by Chemgnam Style

chem
A solution consisting of isobutyl bromide and isobutyl chloride is found to have a refractive index of 1.3931 at 20oC. The refractive indices at 20oC of isobutyl bromide and isobutyl chloride are 1.4368 and 1.3785, respectively. Determine the molar composition (in percent) of ...
November 11, 2008 by un

Math/Physics
Two kg of water at a temperature of 50 degrees C have 485.3 kJ of heat transferred from them, resulting in a mixture of ice/water at 0 degrees C. What is the composition of the mixture? This is what I did and would like verification of my answer. 2*4.183*-50 = -418.3 kJ I then...
March 23, 2013 by Dylan

chemistry
15. On October 21, 1982, the Bureau if the Mint changed the composition of pennies. Instead of an alloy of 95% Cu and 5% Zn by mass, a core of 99.2 Zn and 0.8% Cu with a thin shell of copper was adopted. The overall composition of the new penny was 97.6% Zn and 2.4% Cu by ...
September 12, 2010 by kelly

chemistry
Composition A: 5% MgO - 95% SiO2 Composition B: 20% MgO - 80% SiO2 The two glasses above are soaked in molten calcium chloride (CaCl2) at the same temperature for a time long enough for the properties of the two glasses to approach a steady value. What glass will have the ...
December 21, 2013 by Dick

chemistry
Answer the following questions by referring to the Cu-Al phase diagram shown below. (a) What is the lowest temperature at which a liquid can be found in a system of any composition of Cu-Al? correct (b) A common alloy composition used in airplanes is 4 at. % Cu - 96 at. % Al. ...
December 17, 2012 by danhil

algebra 2
a store is offering a discount of 30% on a suit. There is a sales tax of 6%. A) using a composition of function, represent this situatio in which the discount is taken before the sales tax is applied. B) using a composition of functions represent the situation in which the ...
January 23, 2011 by carly

algebra 2
can you answer this question? a store is offering a discount of 30% on a suit. There is a sales tax of 6%. A) using a composition of function, represent this situatio in which the discount is taken before the sales tax is applied. B) using a composition of functions represent ...
November 16, 2010 by rachel

Math
Redo problem 13 from section 1.8 of your textbook (page 62), but use the functions in the questions below rather than the functions in your textbook: (a) In order to express the function y = 1311 x − 4, as a composition of two functions the outer of which is an ...
June 27, 2014 by Anonymous

Chemistry
I did a lab for Organic Chemistry I did a simple distillation for an unknown and found that it boiled at 76 degrees. I also found out that the unknown was ethanol since we knew what the 4 possibilities were and mine was closest to ethanol. I also did a fractional distillation ...
October 6, 2010 by Omar

physics
Asteroids can be classified into two broad groups based on their composition and location: carbon-rich asteroids dominate the outer part of the asteroid belt, whereas metal-rich asteroids dominate the inner part of the belt. Analysis of the fragment we have discussed in this ...
February 29, 2012 by Lucy

english
how do you write an evaluation? What kind of evaluation are you referring to? Job evaluation? Evaluation of literary work? Or what? If you're referring to a literary evaluation, here's a webpage that may help: http://grammar.ccc.commnet.edu/grammar/composition/review.htm Be ...
November 15, 2006 by dan

Math
Can you show me the work to get these answers also? A.Solve each equation. Leave exact answers: 1.5^3x-2=14 2.log(x-1)-logx=log(x-3) B.If f(x)=x+2/x and g(x)=7/x-5, a. Find the composition (f o g)(x) and simplify completely. b. Find the domain of (f o g)(x).Write answer in ...
December 8, 2013 by Jeff

chemistry HELP PLEASE !
A solution consisting of isobutyl bromide and isobutyl chloride is found to have a refractive index of 1.3931 at 20oC. The refractive indices at 20oC of isobutyl bromide and isobutyl chloride are 1.4368 and 1.3785, respectively. Determine the molar composition (in percent) of ...
November 5, 2008 by Blair

math
(a) In order to express the function y = 1010 x + 4, as a composition of two functions the outer of which is an exponential function, we would let u be equal to the inner function, u = , and then write y as a function of u, as follows: y = . (b) In order to express the ...
September 17, 2010 by Alicia

Calculus
In order to express the function y=12^19x+7 as a composition of two functions the outer of which is an exponential function,we would let u be equal to the inner function, u=19x+7, and then write y as a function of u, as follows: y= ??? . (b) In order to express the function P=...
January 28, 2013 by Jessie

Precalculus
Given f(x)=x^2-1 and g(x)=1/(x-1), the composition f(g(x)) is... a. [(1/(x-1))^2]-1 b. (1/(x-1))-1 c. 1/((x^2)-2) d. 1/(x^2)
August 5, 2011 by Kathy

english
how to write a composition
February 28, 2012 by sandip dutta

Science
What is the composition of the troposphere?
September 25, 2012 by SoccerStar

english composition
i want to know how corruption is a curse
October 17, 2008 by noshin

Grammar and Composition
What is a sentence for adversary ?
April 23, 2010 by y912f

chemistry
What is the percent composition of O in C8H8O3
March 10, 2011 by .

Composition
what does united we stand mean
April 14, 2011 by Bojangles

english composition
how many players are on the team?
May 22, 2011 by frankie

english composition
cousers journal
February 15, 2013 by kiesha

composition
an animal i wanted for pet
May 26, 2014 by sarah

algebra 2
a store is offering a discount of 30% on a suit. There is a sales tax of 6%. A) using a composition of function, represent this situatio in which the discount is taken before the sales tax is applied. the answer is (1.06)(.7x) = .742x B) using a composition of functions ...
January 22, 2011 by jennifer

algebra 2
a store is offering a discount of 30% on a suit. There is a sales tax of 6%. A) using a composition of function, represent this situatio in which the discount is taken before the sales tax is applied. the answer is (1.06)(.7x) = .742x B) using a composition of functions ...
January 22, 2011 by jennifer

CHEMiSTRY
whats the chemical composition of steam?!?
November 4, 2007 by MARGARiTA

college
what is the Social composition on Corporate Greed?
November 23, 2008 by jenn

(Composition)
What is a Competencies Contract? where can I find an template?
January 26, 2009 by Bryan

test socal studies
what is a business composition
March 2, 2009 by joel la

chemestry
what is analgesics? what is its composition? what is their utility in curing?
May 5, 2009 by soumya

chemistry
What is the percent composition for Lucky Charms?
February 17, 2010 by Anonymous

chemistry
why is the law of definite composition important?
March 10, 2010 by Ash

Chemistry
What is the composition of 0.1M sodium acetate buffer,pH 5.00?
March 21, 2011 by Muffin

writing
composition on plan for summer holiday
March 1, 2012 by kavitha

composition
what do manners look like in an introduction?
May 25, 2012 by Anonymous

Grammar Composition
How do you summarize 3 paragraphs of a story?
August 19, 2012 by Losa

calculus
Write h(x) = 6x^4 - 2x^2 + 1 as a composition of two functions f and g
October 20, 2012 by Jake

english
write a composition about whirlpools !
January 11, 2013 by sarah

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