CHEMISTRY (WEBWORK)

58,662 results, page 98

Chemistry

What is the accepted value of the height of a molecule of oleic acid? I cannot find it to do my percent error.

Science repost for help

Sciece (chemistry) - help, Tuesday, September 25, 2007 at 4:32pm what is the particle theory

Chemistry

How many kilograms of chlorine are in 30kg of each of the following chlorofluorocarbons (CFC's)? CF2Cl2 -in kg's; CFCl3 -in kg's; C2F3Cl3 -in kg's?

CHEMISTRY

What experimental observations can support the theory that there is restricted rotation about double bonds?

chemistry

what happens when a hot empty coke can is put in a icy cold water ? what is the reaction?

AP CHEMISTRY

STATE THE HEISENBERG UNCERTAINTY PRINCIPLE AS IT RELATED TO THE DETERMINING THE POSITION AND MOMENTUM OF AN OBJECT.

Chemistry - Solutions

Do all solutes show an increase in solubility with increasing temperature? Explain.

Chemistry - Solutions3

Why do you think there is such a big difference in the solubility of different solids in water?

Chemistry

Which substance can not be decomposed by ordinary chemical means? how? 1. methane 2. mercury 3. ethanol 4. ammonia

Chemistry

How would you purify decanoic acid contaminated with biphenyl? what method and solvent.Please help me

Chemistry

What mass of sucrose, C12H22O11, is needed to make 500mL of a 0.20M solution? Help please... Thanks.

analytical chemistry

What is the pH at the equivalence point in a titration between 0.4450 F NH3 and 0.1520 F HCl?

chemistry

for this reaction: 2NO + heat <-> N2 +O2 which way would the equillibrium shift if catalyst is added?

chemistry

Which of the following subshells is correctly designated? a. 1f5 b. 3s3 c. 6f12 d. 4d11 e. 1p2

chemistry

Which of the following subshells is correctly designated? a. 1f5 b. 3s3 c. 6f12 d. 4d11 e. 1p2

chemistry

Using data from this chapter, calculate the change in energy expected for each of the following processes Rb(g) + Br(g) Rb+(g) + Br -(g)

ap chemistry

How can I calculate the exothermic lattice energy when all I am given is the compound formula LiF?

Chemistry

Which of the following molecules has polar bonds and is nonpolar? HF ICI3 NF3 SF4 BF3

Chemistry

All of the following are weak acids except HF H3PO4 H2SO4 HNO2 HC2H3O2

chemistry

what are the principles/techniques involved in double-indicator titration? especially in carbonate mixtures.

Chemistry

A solution of 100g of water contains 23 g of table salt. At what temperature will it begin to freeze?

Chemistry

What are the symbols of the family of elements that have seven electrons in their outermost energy level?

Chemistry

Hey, can you help me balance this equation? Cu2S + HNO3 --> Cu(NO3)2 + CuSO4 + NO2 +H2O Thanks!

Chemistry

I am trying to find tests physial/chemical to distinguish an aluminum and iron mixture.

Chemistry

What is the average mean of the following data set: 2, 8, 6, 4, 2, 4, 5 (round your answer to 2 decimal points)?

chemistry

which harmful gas is formed when coal and oils containing sulphur impurities are burned?

Chemistry

Number and arrangement of the electron pairs around: a. C in CCl4 b. S in H2S c. Al in AlH3 d. Ga in GaCl3

Chemistry

Number and arrangement of the electron pairs around: a. C in CCl4 b. S in H2S c. Al in AlH3 d. Ga in GaCl3

Chemistry

How would you prepare 455 g of aqueous solution that is 6.50% sodium sulfate Na2SO4 by mass?

Chemistry

Please explain the acitivty series of metals. How can i determine if one element displaces another?

Chemistry

Given the weight of phenacetin and its percentage yield...how would I calculate its melting point?

chemistry

state specifically how you would make a conclusive test for an iron (III) salt.

organic chemistry

Is it possible to reduce an aldehyde and a ketone at the same time with sodium borohydride?

Chemistry

What is the molecularity of each of the following elementary reactions? A. O+O2+N2----> O3+N2+ B. NO2Cl + Cl---> NO2 + Cl2 C. Cl + H2 ---> HCl + H D. CS2----> CS + S

Chemistry

A catalyst does not change the ______ of the reaction. a. mechanism b. enthalpy c. energy of activation d. rate

chemistry

how is the endpoint estimated using potentiometric if no chemical indicator is added to the analyte solution?

chemistry

What are the advantages of a gas as a coolant? (instead of heavy/normal water) (in a fission reactor)

chemistry

how do u calculate the density of an irregular shape? this is 1 of my hm/wk questuions n i wasn't listening...i mean i didn't hear what he said

Chemistry HELP!

What is the translating word equation for water decomposes to form hydrogen oxygen gases?

Chemistry

In the reaction KNaC4H4O6 + H2O + COCl2 * 6H2O ¨ what r the products? and is the tartrate ion the catalyst?

Chemistry

What is the pH of a buffer solution that is 0.15 M propionic acid and 0.20M sodium propionate? How do I start this problem

chemistry

I need help with this equation as soon a possible How many liters of NH are needed to react completely with 30.0 L of NO (at STP)?

chemistry

Does particle size have more or less of an effect on the rate of reaction than temperature?

chemistry

cloud has a pH of 2.0 rainfall has a pH of 5.5 how many times more acidic has the moisture been in the clouds? please help

Chemistry

? g of glucose C6H12O6 must be dissolved in 400 g of water to give a solution that is 0.258 m.

chemistry

What is the orbital hybridization of the central atom S in SF4? 1) sp 2) sp3d 3) sp2 4) sp3d2 5) sp3

chemistry

The bottle of hydrogen peroxide from the store says it is a 3% solution by mass. What is its molal concentration?

chemistry

k we did a lab and i don't understnad how to do this part... Determine the heat absorbed by the solution, which raises its temp.

chemistry

I don't understand what this term means: "Vinegar must not be less than 4% by mass acetic acid."

chemistry

Calculate the current required to transfer 0.015 mols of electrons in a time of 20 min

chemistry

In what ways does the manufacture of a Hybris hybrid powered car use petroleum as a fuel?

Chemistry

How many grams of KF do you need to weigh in order to prepare 500. mL of solution with a concentration of 0.250 M?

chemistry

Suggest a type of reaction and the conditions required to breakdown polyamides into their monomers.

chemistry

Suggest a type of reaction and the conditions required to breakdown polyamides into their monomers.

chemistry

Suggest a type of reaction and the conditions required to breakdown polyamides into their monomers.

chemistry

Suggest a type of reaction and the conditions required to breakdown polyamides into their monomers.

chemistry

The compound with the highest boiling point will be which of the following? A.CH3Cl B.CH3Br C.CH4 D.CH3F

chemistry

how can you tell how many valence electrons family 3 (transition metals) have? im confused about this.

chemistry

2K(s) . Cl2(g) KL 2KCl(s) Write the six possible mole ratios for this equation im so confused

chemistry

what will happen when potassium liliac colored flame is viewed through blue glass

Chemistry

A certain first-order reaction A--->B is 25% complete in 42 min at 25 degrees C. What is the rate constant?

Organic chemistry

Show all steps with reagents how you would synthesize propylbenzene from benzene.

chemistry

what is the balanced equation for the reaction that takes place between bromine and sodium iodide

Chemistry

The solubility of borax is directly proportional to temperature. Therefore, the sign of H is A. negative B. positive

Chemistry

I have a "connecting concepts"on the introduction to Matter worksheet to do, and I don't know how to go about doing it. Can someone please help?? Thanks

chemistry

a test liquid has a density of 1.1g/mL. when you pour some of it into a cup of water, what will happen?

Chemistry

Two hydrides A and B of an element X contain 17.76% and 12.58% by mass of hydrogen. Identify A and B and comment on their structures.

Chemistry 2

Can someone balance this equation for me? Ba(OH2)x 8H20+ NH4SCN--> Ba(SCN2)+ H20 + NH3 Thank you!

chemistry

if the concentration of NO3- in the water is uniformly 5 microMolar, how many moles of N are there per square meter?

chemistry

if the concentration of NO3- in the water is uniformly 5 microMolar, how many moles of N are there per square meter?

ogarnic chemistry

give one reason why we cannot reuse boiling stones after use?

Chemistry

Determine which H atom transition(iinitital, nfinal) was responsible for the absorption of a photon with a frequency of 4.57 x 10^14 Hz. [RH = 2.18 x 10^-18 J; h = 6.63 x 10^-34 J s]

chemistry

Write two conversion factors bsd on the relationship between hours and minutes...

chemistry

Write two conversion factors based on the relationship between hours and minutes...

Chemistry

Which of the follwing is NOT acidic? a. Milk b. saliva c. soft drinks d. blood I believe the answer is d

chemistry

how do i draw a particle model to describe the reaction between sulphur and iron in detail?

Chemistry

Why do gases behave in a less ideal manner when in LOW TEMP. AND HIGH PRESSURE?

chemistry

What preliminary test are you looking for to identify conclusively your unknown solutions as Set C? Explain

chemistry

What is the balanced chemical equation for the reaction used to calculate of delta Hdagrees f of CaCO3(s)?

chemistry

explain why some numerical values have an unlimited number of significant digits

Chemistry

explain how the celsius scale was devised and why it is not appropriate to use it when describing the behavior of gases

chemistry

write the total and net ionic equation for calcium hydroxide(aq) -> acetic acid(aq)

Organic Chemistry

Why is benzyl chloride reactive in both tests, whereas bromobenzene is unreactive?

chemistry

How many degenerate orbitals are needed in CIF5 to contain seven electrons with five of them unpaired?

chemistry

give the oxidation number of nitrogen in the following: 1. NH2OH 2. N2F4 3. NH4+ 4. HNO2

chemistry

is it possible for the reaction between two aqueous solutions to be neither endothermic or exothermic?

chemistry

Write a Lewis structure of OSF4 in which the formal charges of all atoms are zero

8th grade

In chemistry what is the practical applicaiton of scientific principles to solve everyday problems?

chemistry

1-ACETOXY-1,3-BUTADIENE which of the funtional groups exist in the compound above? a. Ketone b. Aldehyde

Organic Chemistry

Explain why the terminal alkyne has an acidic proton compared to alkane and alkene.

chemistry

Could tell me an experiment which a spectrophotometer would be useful, other than finding the absorbency of a solution? Thanks

Chemistry

In fluorescence, why do we have to preapre a calibaration curve for every compound in our sample?

Chemistry

In fluorescence, why do we have to preapre a calibaration curve for every compound in our sample?

Chemistry

Calculate ΔHºrxn for the reaction 3 O2(g) ==> 2 O3(g) This is the information I am given: 2H2S(g) + SO2g) ==> 3S(s) + 2H2O(l)

chemistry

When hydrochloric acid is mixed with magnesium and a flame is put in the tube what causes a reaction?

9th chemistry

I don't understand the formula for sodium hydrogen phosphate. Can you please tell me it and explain it?

chemistry

Calculate the number of C, H, and O atoms in 4.50 g of glucose (C6H12O6), a sugar. okay i did it and i got just the C right and not the H and O help?

chemistry

What was Le Chatelier’s principle, in The effect on the equilibrium yield of nitric oxide of increasing the pressure?

Chemistry

I know how to balance equations, but for some reason I can't seem to get this problem. Can anyone help? FeO3 + CO to Fe2S3 + NH4Br

chemistry

describe evidence that chemical reactions take place during a firework display

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