chemistry! URGENT

60,412 results, page 26

English

What could be the theme of this poem? What I would like to know is the subject matter and also what could be the author's commentary on the poem. Sonnet - Silence by: Edgar Allen Poe There are some qualities- some incorporate things, That have a double life, which thus is made...

Chemistry

Hello everybody, I'm having difficulty understanding the rationalization behind the strengths of Bronstend Lowry acids and bases and my textbook isn't too helpful. Can someone please expalin to me: (1) What exactly is effective negative charge density? (2) how does ...

8th Grade Chemistry

This is from the Glencoe book Chemistry, Book L. Unlike sodium and chlorine, some atoms becomre more stable by sharing_______, forming______________rather than charged__________. The bonds in a molecule of oxygen are _______ _______ bonds, while the bonds in molecule of water ...

Chemistry

Why is it that copper (II) sulfate with barium hydroxide --> copper hydroxide (solid) + barium sulfate (solid)? According to the solubility rules given to me by my professor, both are insoluble, and therefore should be labeled as solids. Is there something I'm missing here...

Chemistry

Why is it that copper (II) sulfate with barium hydroxide --> copper hydroxide (solid) + barium sulfate (solid)? According to the solubility rules given to me by my professor, both are insoluble, and therefore should be labeled as solids. Is there something I'm missing here...

university chemistry

this is for a chemistry laboratory experiment called "how much caffeine is there in instant coffee" What should be the pH of the aqueous layer to extract caffeine? There are three aqueous solutions that you may choose from. A. pH >14, using 2.5 M NaOH (aq) B. pH 1, using 0....

Chemistry - HELP IGCSE

I have a chemistry exam tomorrow and I don't get the double bonding in covalent bonding I tried many websites , textbooks and other books and yet nothing worked Can someone please explain it clearely and in a simple way and please don't put any links for websites ca use ...

chemistry

solve Ka for HX => H^+ + X^- given 0.1M LiX at pH=8.9 Chemistry - DrBob222, Tuesday, March 30, 2010 at 6:32pm LiX(aq) ==> Li^+(aq) + X^-(aq) X^- is a base and hydrolyzes in water to X^- + HOH ==> HX + OH^- Make an ICE chart and substitute into the following: Kb = (Kw/...

Science (Chemistry)

I'm not sure how to do a couple of problems on my chemistry worksheet. Can you please help me? You dissolve 0.00902 g of naOH in enough water to make 1000 mL. What is the Ph of this soultion. What is the molarity, pH, and pOH of 5.00 of naOH in 750.0 mL of soultion. I know how...

Chemistry

The question is: Isotonic saline is a 0.9% (g/100ml) solution of salty water. You are asked to make up 2L of isotonic saline. How much salt should you weigh out? I got the answer of 18g with the following working: 9 ÷ 1000(ml) x 100 = 0.9 Therefore 9% of 1000ml (1L) is 9g ...

chemistry

A chemistry student weighs out 0.172 grams of acrylic acid (HCH2CHCO2) into a volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1800 moles/liter NaOH solution. Calculate the volume of NaOH solution the student will need to add ...

Chemistry

I was given a chemistry worksheet that said the following Solutions mixed at the BLANK level Colloids Mixed at the BLANK level Suspensions mixed at the BLANK level What do you suppose the blanks could be? Thank you.

GREAT GATSBY URGENT!!!!!!!!

explain a theme in the great gatsby, multiple paragraphs What theme do you want to explain? Please post your answer here and someone may be able to critique it for you. tragedy and the american dream http://www.sparknotes.com/lit/gatsby/ http://www.gradesaver.com/classicnotes/...

Chemistry

The energies, E, for the first few states of an unknown element are shown here in arbitrary units. n 1 E -11 n 2 E -5 n 3 E -2 n 4 E -1 n ... E ... n infinite E 0 A gaseous sample of this element is bombarded by photons of various energies (in these same units). Match each ...

geo

Hi... I need some URGENT help with my geography essay, I'm suppose to have three reasons to why canada is the best country and I'm looking for a 3 strong arguments ... i have 2 already down , economy and physical geography . I need to have 11 paragraphs in total. so that means...

algebra

in a class of 30 students , there are 22 students who study chemistry but not physics, 4 who study physics but not chemistry and who study neighter chemistry nor physics. how many students in the class study physics

Chemistry

I'm stuck on this one problem in Chemistry: A student measures the mass of an object as 2.32 grams and its volume as 34.56mL. The student then calculates the density to be 0.067129629. There are two things wrong with the students value for density. What are they? Now when I ...

Chemistry

I need help with this chemistry flame test lab discussion question. "List the metals used in this lab in increasing order of the energy of the light emitted." We tested BaCl2, CaCl2, CuCl2, FE(NO3)3, KCl, LiCl, NaCl, & Sr(No3)2. I'm not completely sure how to know the energy ...

Chemistry

I need help with this chemistry flame test lab discussion question. "List the metals used in this lab in increasing order of the energy of the light emitted." We tested BaCl2, CaCl2, CuCl2, FE(NO3)3, KCl, LiCl, NaCl, & Sr(No3)2. I'm not completely sure how to know the energy ...

Chemistry

I need help with this chemistry flame test lab discussion question. "List the metals used in this lab in increasing order of the energy of the light emitted." We tested BaCl2, CaCl2, CuCl2, FE(NO3)3, KCl, LiCl, NaCl, & Sr(No3)2. I'm not completely sure how to know the energy ...

Chemistry

Expressing amounts of energy in different energy units is necessary to solve many chemistry problems. For practice, complete the following table. FILL IN THE BLANKS PLEASE. The Joule (J) is the SI unit of energy. 1 calorie (cal) = 4.184 J J cal kJ 695 ___ ___ ___ 132 ___ ___ ...

Chemistry

A chemistry student weighs out 0.123 grams of chloroacetic acid into a 250. milliliter volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.2100 moles/liter NaOH solution. Calculate the volume of NaOH solution the student will need...

Chemistry (DrBob222)

Hi Dr. Bob would you please tell me what D rpresents? Thank you! What is the reactant, products, and what compounds is it? Is it H2O, O2, or what? What are the transition molecules? Help please. Do as below to get to the image. I couldn't put the URL in and it isn't my website...

Chemistry

I know nothing about chemistry, but am wondering if someone could help me with these. 1) Balance this redox reaction using the oxidation-number method. Zn + O2 + HCl ® ZnCl2 + H2O 2) Balance this redox reaction using the half-reaction method. (basic solution) Zn + MnO4- ® Zn...

chemistry

i have to do a "chemistry of cooking" project for my chem class. for the project i need to convert pounds, grams, and ounces into moles, but i do not know how. for example, i need to convert 453.5g of beef into mols. how do i do that? do i need to know the chemical formula of ...

chemistry

Effusion/Diffusion Chemistry Help!!! If 4.83mL of an unknown gas effuses through a hole in a plate in the same time it takes 9.23mL of Argon, Ar, to effuse through the same hole under the same conditions, what is the molecular mass of the unknown gas? (146amu)

Organic Chemistry

Why does CH3Br react faster with hydroxyl ions (OH^-) than CH3Cl? In the halogen series, Br has a weaker bond with the CH3 than Cl. Smaller halogen atoms have a larger electron affinity to fill the outer shell. The greater tendncey of CH3Br to break up into a CH3+ ion ...

Chemistry-DrBob222

I got an answer of -1.34 x 10^3 KJ/mol. A 10.00 mL aliquot of 0.100 M NaOH is added to 15.00 mL of 0.100M HCl in a coffee cup calorimeter. The initial temperature of the two dilute liquids were both 25.0 degrees C and the final temperature of the mixture was found to be 37.8 ...

Chemistry

chemistry student weighs out 0.123 grams of chloroacetic acid (HCH2ClCO2) into a 250. milliliter volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1200 moles/liter NaOH solution. Calculate the volume of NaOH solution the student...

Chemistry

A chemistry student weighs out 0.123 grams of chloroacetic acid (HCH2ClCO2) into a 250. milliliter volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1200 moles/liter NaOH solution. Calculate the volume of NaOH solution the ...

Chemistry

A chemistry student weighs out 0.123 grams of chloroacetic acid (HCH2ClCO2) into a 250. milliliter volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1200 moles/liter NaOH solution. Calculate the volume of NaOH solution the ...

CHEM URGENT

liquid methanol, CH3OH is being prepared to be poured into a beaker of water. (THERE CAN BE MORE THAN ONE ANSWER FOR Q1-3) 1) What intermolecular forces are broken in the methanol when these substances are mixed? -hydrogen-bonding -dispersion forces -dipole-dipole interactions...

physics (Urgent)!!!!!!!!!!!!!!!!!!!!!!

A small block of mass m=1 kg glides down (without friction) a circular track of radius R=2 m, starting from rest at height R. At the bottom of the track it hits a massless relaxed spring with spring constant k= 9 N/m, which starts to be compressed as the block continues to ...

Chemistry

In which direction will the net reaction proceed X(g)+Y(g)<---->Z(g) Kp=1.00 at 300k for each of these sets of initial conditions? a) [X]=[Y]=[Z]=1.0 m net reaction goes to the left net reaction goes to the right reaction is at equilibrium I chose 3 for a. b) Px=Pz=1.0 ...

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 ...

English

Can you help me check these sentences, please? Thank you. I need to improve both the grammar and the vocabulary.It's urgent. 1) Claire was a sixteen-year-old girl from Texas when she met John, her future boy-friend. 2) They met each other at a friend's party and started dating...

Chemistry

When burning a Magnesium Ribbon, would the color (the white dust) that it changed to be a chemical change? Or how about the spark it makes (I am just in basic chemistry, so that spark might be counted as a chemical change)? So far I got from the help for Drbob: 1.Reacts with ...

chemistry

solve Ka for HX => H^+ + X^- given 0.1M LiX at pH=8.9 Chemistry - DrBob222, Tuesday, March 30, 2010 at 6:32pm LiX(aq) ==> Li^+(aq) + X^-(aq) Question for DrBob222 - is the X^- value in the ICE calculations 0.1 from the initial LiX 0.1M? X^- is a base and hydrolyzes in ...

math

Elin estimates her probability of passing French 0.6, passing chemistry is 0.8, (a)determine the probability that elin will pass French but fail chemistry (b) pass chemistry but fail French (c) pass both classes (d)fail both classes

Physics Urgent!!!!!

Newton’s Law of Gravity specifies the magnitude of the interaction force between two point masses, m1 and m2, separated by the distance r as F(r) = Gm1m2/r^2. The gravitational constant G can be determined by directly measuring the interaction force in the late 18th century ...

Physics Urgent!!

Newton’s Law of Gravity specifies the magnitude of the interaction force between two point masses, m1 and m2, separated by the distance r as F(r) = Gm1m2/r^2. The gravitational constant G can be determined by directly measuring the interaction force in the late 18th century ...

URGENT Physics help

Positively charged Object A is brought close to neutral Object B but does not touch it. The two objects begin to attract each other. What is this process called? (Points : 1) grounding charge polarization conduction repulsion 4. How many coulombs could be in a lightning bolt...

Science (URGENT)

Can someones please check my work? 1. Why does a liquid take the shape of whatever container it is in but does not expand to fill the container completely? A: It takes the shape of its contaienr because its particles can slip past each other. but it has fixed volume and does ...

Chemistry

I have a Chemistry question which should be very simple but I do not know what significant figures are. Assuming the following numbers are measurements and using the rules for significant figures, determine the answer for the following calculation. (15.5/42)*219.5= 1. 81.0059 ...

Chemistry HELP ASAP

A Gouy balance is used to determine the magnetic susceptibility of a substance. A strong electromagnet is placed next to the sample, which is on a balance. If the sample is paramagnetic, the mass reading of the balance will increase when the field is switched on. Based on ...

Chemistry (creativity)

Hey everyone. Well the part I need help in isn't exactly the chemistry part. My assignment was to research an element, and at the end, come up with some creative picture/cartoon. The problem is... I'm not exactly the creative type. My element was Mercury, any ideas? Humor and ...

english

hi what does the alliteration in the first line of this poem represent In The Gallery Here neither nymph nor naiad ever bathed nor Saint refreshed herself in pristine water, here, in The Gallery, between Tie Rack, Camera Shop, B. Dalton, Radio Shack, Dad's Pizzas, Message ...

Chemistry+balancing equation tips

We are on combustion reaction at the moment in chemistry, and I have to say, these reactions are like extremely hard to balance(well, just alot of erasing). It takes me a while to balance combustion reactions and I want to know if theres any tips in balancing them? Should I ...

math-urgent

Newton’s Law of Cooling states that the temperature of a heated object decreases exponentially over time toward the temperature of the surrounding medium. The temperature u of a heated object at a given time t can be modeled by the following function: u(t)=T+(u-T)e^kt K<0...

science

i really need to know what alkalis and acids are in soap!!! FOR TOMMOROW! Thank you for using the Jiskha Homework Help Forum. Here is something on soaps from a Chemistry site: http://www.cleaning101.com/cleaning/chemistry/ page 2 = http://www.cleaning101.com/sdalatest/html/...

chemistry

50.0 mL of a 0.00200 M Cd^2+ solution is titrated with 0.00400 M EDTA in the presence of 0.0750 M NH3 buffered at pH = 9.00. Determine pCd^2+ when 28.5 mL of EDTA solution have been added. Cd^2+ + Y^4- ? CdY^2- Kf= 3.16 x 10^16 Cd^2+ + NH3 ? CdNH3^2+ ß1 = 3.24 x 10^2 Cd^2+ + ...

English

I really need to know if all the coorections are OK. It is really urgent. 1)The subject of the poem is the description of some soldiers while they are retreating through (toward) their trenches. 2)They should be young and strong but, because of their tireness (tiredness) the ...

chemistry

when magnesium chlorate under goes decompostion, oxgen gas is realsed in the following reaction: 2KClO3→ 2KCl + 3O2 repeat 2KClO3→ 2KCl + 3O2 when 3.50 grams of potassuim chlorate is decomposed at STP, how many litters of oxgen will be produced? chemistry - Da

Chemistry

Here is my question and I,m hoping I worked the problem out correctly. A 10-g mass of krypton occupies 15.0 L at a pressure of 210 kPa. Find the volume of the krypton when the pressure is increased to 790 kPa. V2 = V1 x P1/P2 V2 = 15.0 L x 210 kPa/790 kPa = 3.98 L or rounded 3...

Chemistry

An experiment that led to the formation of the new field of organic chemistry involved the synthesis of urea, CN2H4O, by the controlled reaction of ammonia and carbon dioxide. 2 NH3(g) + CO2(g)= CN2H4O(s) + H2O(l) What is the theoretical yield of urea when 100. g of ammonia is...

Chemistry

I posted a question like this but my numbers were actually wrong. These are the correct ones. 5.94e-3 / 1.11e-3 = 5.33e-2/2.66e-2 5.35 = 2.00^m I guess this is not correct because I do not know a whole number that will give you 5.35. Chemistry - DrBob222, Tuesday, February 28...

Chemistry

SO this is my first time doing this... lol i need help on an AP chemistry question for equilibrium. A 0.500 L tank contains 3.00 g of NO(g) at 750. K. The equilibrium constant for the reaction below at this temperature is 3.4 x 10 -3 2NO(g) ⇌ N2(g) + O2(g) (a) write the ...

Chemistry

Hi, I have few questions from a chemistry lab that i did, 1) I'm not sure whats the point of heating a nitrate (NaNO3) 2) I'm not sure why you add NaOH to NaNO3 after it has dissolved in water 3) I'm not sure why do we have to test what gas is produced from calcium hydroxide ...

english

hi can someone pleases help me analyze this poem. I need a lot of help In The Gallery Here neither nymph nor naiad ever bathed nor Saint refreshed herself in pristine water, here, in The Gallery, between Tie Rack, Camera Shop, B. Dalton, Radio Shack, Dad's Pizzas, Message ...

physics (Urgent)!!!!!!!!!!!!!!!!!!!!!!

Consider a rocket in space that ejects burned fuel at a speed of vex= 1.5 km/s with respect to the rocket. The rocket burns 8 % of its mass in 280 s (assume the burn rate is constant). (a) What is the speed v of the rocket after a burn time of 140.0 s? (suppose that the rocket...

English

Thank you very much for your help. Here are some more sentences I'm not sure of. 1)Each South-American family owned more than twenty slaves on average. 2)Slaves were mostly needed to work on plantations. Their task was to grow and harvest sugar cane. In those profit-making ...

set

of 250 candidates writing a exam, 147 passed in math,150 pass in chemistry and 85 pass subjects B)calculate the number of students who pass i)pass math only ii)pass chemistry only iii)passed neither iv)pass only one subject

physics(URGENT!!!!!)

A source of sound emits waves at a frequency f= 650 Hz. An observer is located at a distance d= 170 m from the source. Use u=340 m/s for the speed of sound. (a) Assume completely still air. How many wavefronts (full waves) N are there between the source and the observer? N= ...

Chemistry

I'm supposed to do this for an organic chemistry prelab. I've read my books and tried Googling everything possible, but I still don't know how to set this up. Please help! The solubility of a certain compound in ice-cold water is 0.18g in 100 mL. Its solubility in hot water is...

MATH URGENT!!!

A researcher is interested in the effects of monetary incentives on task performance. She recruits 60 undergraduate business students and offers to pay them each $5 for a 1 hour research session. She then randomly assigns these students to either a control group or an ...

Urgent Science!!!

1. Which of the following is NOT a fossil? (1 point) outline of a fern found in a rock petrified wood in the desert baby mammoth found in a glacier old stone tools found in a cave 2. _____ is based on the idea that younger rock layers are deposited on top of older rock layers ...

accounting URGENT HELP DUE IN 1HR

(a) Fill in the missing amounts. (If answer is zero, please enter 0. Do not leave any fields blank.) Account Titles Trial Balance Adjusted Trial Balance Dr. Cr. Dr. Cr. Accounts Receivable 34,000 Prepaid Insurance 26,000 20,000 Supplies 7,000 Accumulated Depreciation 12,000 ...

Chemistry

From the Standard Potential Table in your general chemistry textbook: Half-reactions are written as _________ reactions with charge and mass balanced. Among the ions, Cd2+Pb2+ & Ca2+ ,__________ has the greatest ability to reduce to its neutral metal. (Use ^ for superscripting...

College: Chemistry

Hi there, I need help on my homework for chemistry and I do not understand the step on how to work this problem out. Please help me with this problem: On a Sunday morning while having your breakfast you determine that you need about 2.95X10^(5)J to heat water for your tea in ...

MATHS

in a class of 60 students,the number of students who pass biology is 6 more than the number who pass chemistry.every student passed at least one of the two subject.how many pass in only biology.how many pass in only chemistry.

college: Chemistry

Hi there I need help with my chemistry homework There are two parts to the first question and i did the first part and i got E= -6.54E-18J. Part A) Calculate the energy (in J) of the photon associated with the transition of electron in He from n=2 to n=1. Part B) As the Value ...

Chemistry

My chemistry teacher said that the pCO2 value increases during hypoventilation. Why is that? If hypoventilation causes shortness of breath, would that not increase the CO2 concentration, therefore decreasing pCO2? Because if you think about pH, a larger H concentration causes ...

Chemistry

My chemistry teacher said that the pCO2 value increases during hypoventilation. Why is that? If hypoventilation causes shortness of breath, would that not increase the CO2 concentration, therefore decreasing pCO2? Because if you think about pH, a larger H concentration causes ...

Chemistry

Hi Dr. Bob, I am quite stumped on how to figure out when chemical equations have a REACTION or NO REACTION. I have read the material in my textbook and even took out a chemistry books for the "Utterly Confused" to try to figure this out. Example: Zn(s) + H3PO4(aq)--> Zn3(...

chemistry

With respect to Boyle's law (lab experiment with textbooks on an apparatus), if in the classroom the air pressure in the classroom is equal to 2.4 textbooks, how does one find the total pressure of a book with the volume of 26? Am I on the right track by dividing the volume of...

chemistry

i am trying to find the average rate of h2? from mastering chemistry home work. part a answer was 0.027m/s and part b answer was 0.054m/s. i cant find part c home answer

12 Biology! URGENT!

Is this right: Place numbers beside the statement below to indicate the order of events occurring in the light reactions: 3 low energy electrons at PSI are re-energized by a photon of light 5 electrons energized at PSII jump to a higher lever, as they fall through various ...

12 Biology! URGENT!

Is this right: Place numbers beside the statement below to indicate the order of events occurring in the light reactions: 3 low energy electrons at PSI are re-energized by a photon of light 5 electrons energized at PSII jump to a higher lever, as they fall through various ...

ap chemistry

home / study / questions and answers / science / chemistry / balance the following example of a heterogeneous ... Your question has been answered! Rate it below. Let us know if you got a helpful answer. . Question Balance the following example of a heterogeneous equilibrium ...

French-Urgent

With a partner, play the roles of an American student who is shopping at a ski resort in the french Alps and the salesclerk at the resort's boutique. The customer's brother wants a nice French ski jacket and has given the customer enough money to buy it. During the course of ...

math

In a class of 80 students,53 study Art,60 study biology,36 study art and biology,34 study art and chemistry,6 study biology and 18 study biology but not chemistry.Determine the number of students who study =Art only =Chemistry only

Chemistry

i need some help with my science homework it`s the chemistry GCSE core:C2 TASK SHEET i need to design a leaflet explaining how to extract gold aluminium and iron. the words i need to include are anode,bauxite,carbon,carbon dioxide ,cathode,crust,cryolite,displacement,reaction,...

physics

A sophomore chemistry student holds a 500mL Erlenmeyer flask full of concentrated nitric acid high above his head at a height of 1.75 meters and declares, "I'm the King of Chemistry!" At that moment another student, startled by the sudden ignition of her Bunsen burner, jumps ...

chemistry

To culinary experts and to the average person the term “Extra Virgin” has a ring of exclusiveness and quality to it. When it comes to olive oil, exactly what does this term signify? I am supposed to explain the chemistry behind Extra Virgin Olive oils, what makes the ...

Chemistry

To culinary experts and to the average person the term “Extra Virgin” has a ring of exclusiveness and quality to it. When it comes to olive oil, exactly what does this term signify? I am supposed to explain the chemistry behind Extra Virgin Olive oils, what makes the ...

French (URGENT #2)

Can someone please help check my work? There were no instructions, it is as I have written it. Am I supposed to choose only one? or more? 1. On peut pratiquer les sports décrits dans cette annonce... info: SPORTS. Cercle. Nautique. Martinique. Ski nautique - Planche à voille...

chemistry

1. Unless otherwise instructed, you may use the periodic table in the Chemistry: Problems and Solutions book for this test. You also may use the formulas on pages 238 243. A student increases the temperature of a 556 cm3 balloon from 278 K to 308 K. Assuming constant pressure...

math

A textbook store sold a combined total of 315 physics and chemistry textbooks in a week. The number of physics textbooks sold was two times the number of chemistry textbooks sold. How many textbooks of each type were sold?

math

A textbook store sold a combined total of 462 biology and chemistry textbooks in a week. The number of biology textbooks sold was two times the number of chemistry textbooks sold. How many textbooks of each type were sold?

Chemistry

i need help. Calculate the pH of a 0.24 M CoCl3 solution. The Ka value for Co(H2O)63+ is 1.0 10-5. how do u do these with like the Cl there? Responses Chemistry - DrBob222, Monday, February 16, 2009 at 12:35am Just ignore the Cl^-. Co(H2O)6Cl3 ==> Co(H2O)6^+3 + 3Cl^- Then ...

science... Help me urgent!!

Please help me check if I did my homework right base on a picture of picking strawberry farm. 1. Activity Investigation Picture Scientific Method: I. Perceiving the Problem Are these people a worker in a farm? II. Research a. Wearing different style of clothes b. Different ...

Chemistry

What is the final concentration (M) of a solution prepared by diluting 50.0 mL of a 6.00 M KCl solution to a volume of 0.500 L? A. 1.67 B. 0.600 C. 0.0167 D. 3.0 E. none of these My initial thought was to take the 6.00 M KCl/0.500 L, for an answer of 12. This baffles me that ...

Chemistry

"Hi there! So I have a chemistry project due in a few hours. I need to find the molar mass of a specific antacid tablet, but all I know is that the tablet is made up of 550mg CaCO3 and 110mg Mg(OH)2 I also know that the tablet has a mass 1.35g. How do I find the molar mass of ...

Chemistry(Please help)

delta Go = -431.16kJ/mol - (298k X 0.12529 kJ/K*mol) I am having trouble converting the units for delta H and delta s to match. I multiplied delta H by 1000 to get kJ but this didn't give me the correct answer. Chemistry(Please help) - Dev, Wednesday, April 25, 2012 at 6:56pm ...

Overdue Science Lesson, Very Urgent.

1: How does sea-floor spreading occur? A, New materials are being added to the asthenosphere. B, Earthquakes break apart the ocean floor. C, Sediments accumulate at the area of spreading. D, Molten material beneath Earth's crust rises to the surface. 2, Which features form the...

chemistry

Where can I find the answers to these questions in my text, "fundamentals of analytical chemistry" by skoog, west, holler and crouch. 1. Why is acetylsalicylic acid analyzed using back titration? 2. Discuss the importance of simmering the tablet in the NaOH solution for 20 ...

Coordination Chemistry

A particular metal ion octahedral complex has the same number of unpaired electrons (non-zero) whether the complex uses weak or strong field ligands. List several fourth period transition metal ions that could have this behavior. Also, if someone could point me in the ...

Chemistry

Posted by Hannah on Saturday, April 18, 2009 at 3:05pm. Find the pH of a 0.010M solution of NH4ClO4 and the pH of a 0.010M solution of NH4C2H3O2. Responses * chemistry - Anonymous, Saturday, April 18, 2009 at 3:36pm after finding the ph of the corresponding ions in these two ...

social studies 20-1 (URGENT)

examine each source below and write in paragraph form, a response in which you: -interpret each source to identify and explain the perspective(s) related to Nationalism. -identify and discuss one or more ideological concepts that are refleted in the sources. -Use your knowlage...

Chemistry!! - bobpursley please

Calculate the maximum wavelength of light capable of removing an electron for a hydrogen atom from the energy state characterized by the following when n=4 =__________nm Responses Chemistry!! - bobpursley, Wednesday, October 22, 2008 at 4:05am So the two energy states are n=4 ...

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