CHEMISTRY (WEBWORK)

58,868 results, page 99

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

chemistry

describe evidence that chemical reactions take place during a firework display

Chemistry

Sorry, I still do not understand why metals react more vigorously in acids than in water?

chemistry

What would happen to a weak base dissocialation equilibruim if more products were added?

chemistry

In Iodometry, I already know that I- will be oxidized to I2 if titration of Cu(II) is not done immediately, but what effect does it have to the molarity of S2O3^2-?

Chemistry

What chemical test (axcept a magnet) to use to distinguish between iron and sulphur?

Chemistry

What is the balanced chemical equation for the reaction of potassium with oxygen? would it be: K + 0 --> K20 I am not sure can you help me?

Chemistry

What is the total vapor pressure of NaCl solution at 25C with mole fraction of 0.01? (X_NaCl = 0.01) Thanks!!

chemistry

a 16.2 L sample of CO(g) at 1.50 atm and 200.*C is combined with 15.39g of Fe2O3(s), How many moles of CO(g) are availabe for the reaction

Chemistry

At what initial concentration would a solution of acetic acid (ka=1.8x10^-5) be 2% ionized? I am stuck. Thanks -J

chemistry

The pH of a 1.00 10-3 M solution of pyrrolidine is 10.82. Calculate Kb. i keep getting anumber that is ^ (positive) and that's way to big....

Organic Chemistry

The reaction of (Z)-butenedioic acid with 1,3-cyclopentadiene gives only one product. Why?

chemistry

What volume (in liters) does 3 g sample of Argon (Ar) gas occupy at standard conditions (STP)?

chemistry

would ionic or covalent substances be more dangerous near an open flame? why?

chemistry

The density of a gas is 2.0 grams per liter at STP. Its molar mass is approximately?

Chemistry

The Ka values of H3PO4 are shown below. Ka1 7.5 10-3 Ka2 6.2 10-8 Ka3 4.8 10-13 What is the pH of a 0.19 M solution of NaH2PO4?

chemistry

i don't know how to write balanced chemical half reactions for the oxidation of copper, aluminum, and nickel. can anyone help me?

CHEMISTRY

Find the number of moles. a. 3.01*10^23 molecules H2O. b.1.000*10^23 atoms C. c. 5.5610 *10^22 ions Na^+.

Chemistry

Last one. Describe how you would prepare 100ml of a solution that is 22% acetic acid by volume?

Chemistry

Last one. Describe how you would prepare 100ml of a solution that is 22% acetic acid by volume?

Chemistry

Last one. Describe how you would prepare 100ml of a solution that is 22% acetic acid by volume?

CHEMISTRY HELP

NH3 + HCl --> can someone please finish that?? is it 2H2 + N2 + Cl or something? if so how would i balance it?

AP Chemistry

In the titration of 50.0 mL of 1.0 M CH3NH2 (kb=4.4 x 10^-4), with 0.50 M HCl, calculate the pH a) after 50.0 mL of 0.50 M has been added b) at the stoichiometric point.

chemistry

your reactants are two compounds composed of ions. what type of reaction do you probably have?

chemistry/science

Carbon tetrachloride, CCL4, is nonpolar. What force holds the molecules together?

chemistry

the formula: Ca(ClO3)2 --> CaCl2 + 3O2 what mass pf O2 results from the decomposition of 1.00 kg of calcium carbonate

Chemistry

What are the two half reactions for 3Mg+1Fe2(SO4)3 yields 3MgSO4+2Fe? thanks for your help

chemistry

hpw would i draw a lewis structure for a molecule with 3.5 bonds for example NO2???

chemistry

Define the term 'polymer' and then name two examples of naturally occurring polymers.

chemistry

If 20 g KCl is dissolved in 100g of water at 20 degrees C, is the solution unsaturated, saturated, or supersaturated?

chemistry

If 20 g KCL is dissolved in 100g of water at 20 degrees C, is the solution unsaturated, saturated, or supersaturated?

Chemistry

how many electrons pairs surround an atom of boron (B,element 5) bonded in the compound BCI3?

Chemistry

Which of the following indicates the greatest pressure? A) 1 atm B) 777 torr C) 5.5 mm Hg D) 1000 Pa E) 12 psi

chemistry

hi can someone please help me I need a detailed scientific article about ozone depletion thank you

chemistry

450m/s to mi/h? 1km/1000m*1mi/1.690km = 3600 sec/1m 1617.3976mi/h?

Chemistry

How do I calculate how much sodium bicarbonate I need to neutralise 1L of 18M sulphuric acid?

Chemistry II

What is the molarity of a solution in which 13.7 g of calcium chloride is dissolved in water to a final volume of 750.0 mL?

Chemistry II

what is the molar mass of a gaseous organic compound with a density of 3.38 g/L at 40oC and a pressure of 1.97 atm?

Chemistry

What would be a chemically reasonable formula for a compound consisting of each of the following pairs of elements: (a) K and F (b) N and S

Chemistry

What would be a chemically reasonable formula for a compound consisting of each of the following pairs of elements: (a) K and F (b) N and S

Chemistry II

When dissolved in water, ammonium phosphate would have a value of __________ for i solute.

College Chemistry

How many electrons in an atom can have each of the following quantum number or sublevel designations? (a)n=2; l=1; m=0 (b)5s (c)n=4; l=1

chemistry

What are the different physical properties between HCl and NaCl? And explain the causes of their differences? THANKS

chemistry

What are the different physical properties between HCl and NaCl? And explain the causes of their differences?

CHEMiSTRY PLEASE HELP

What is the mass of 4.2 kg of gold when it is transferred to a planet having twice the gravity of earth?

Chemistry

When 20.5g of methane and 45.0g of chlorine gas undergo a reaction that has a 75.0% yeild, what mass of chloromethane forms?

chemistry

What volume (in mL)of 0.0550 M calcium hydroxide is required to neutralize 38.00 mL of 0.0700 M nitric acid?

chemistry

The reaction of chlorine (Cl2) with 1,4-dimethylcyclohexane (show three possible monochlorination products) *what?!*

Chemistry

How many grams of CaH2 are needed to generate 54.5L of gas if the pressure of is 815 torr at 20C?

Chemistry

500 mL of water is added to 25 mL of 6.0 M hydrochloric acid. What is the final concentration of this solution in mol/L?

Chemistry

Consider the titration of 50.0 mL of 0.20 M NH3 (Kb = 1.8x10^-5) with 0.20 M HNO3. Calculate the pH after addition of 50.0 mL of the titrant.

chemistry

in response to DrBob, the textbook gives this equation for the problem. So if you could balance it as it is written, great!

Chemistry

After 0.6523 g of is heated, the residue has a mass of 0.3423 g. Calculate the % H2O in the hydrate.

chemistry

which has a higher inoization, phosphorus or sulfur? back-up your answer with an electron orbital dieagram for each

chemistry.

Write the symbols for three other species, which also have the electron arrangement of 2.8.

chemistry

how do you know what/which roman numeral to place between the cation and the anion of metal-nonmetal substances?

chemistry

how do you know which roman numeral to put between the cation and the anion of a metal-nonmetal substance?

Chemistry

What are complementary colors and how due different wavelengths of light affect the original color?

Chemistry

What are some different ways two water molecules could be positioned so that they stick together?

Chemistry

which metal does not require having its charge specified in the names of ionic comppounds it forms? a. Au b. Ca c. Cu d. Cr e. Fe

Chemistry (lab)

What are the units of retention time in gas liquid chromatography? Minutes or seconds?

chemistry

What number of electrons fit into energy levels higher than the third level?

chemistry

Is the protonated/acidic form of bromothymol blue more soluble in water or dichloromethane?

chemistry

Are the following quantum number combinations allowed? Else show any one way to correct them. a. n = 2, l = 0 m = -1 b. n = 4, l = 3 m = -1 c. n = 1, l = 0 m = 0 d. n = 3, l = 1 m = -2

chemistry

What salt is formed when sodium hydroxide is neutralized by perchloric acid? NaOH + HClO4 -> ?

Chemistry

I need some help to draw a Lewis structure for hydrogen cyanide + what is the noble gas?

chemistry

What are compounds that have the same molecular formula but different structural formulas called?

chemistry

How would you prepare 100.0 mL of 0.07500 M AgNO3 solution starting with pure solute?

Chemistry

if 8.50grams CH4 reacts with 15.9grams of oxygen gass which of the prdocut is the excess and which is the limiting.

chemistry

Given the plot of 1 vs 1ni2, what is the value of nf? y=-0.011x+0.0027 R^2=1 1/n(initial)^2=.04 1/lambda=.0023

chemistry

how ,many grams of aspirin are required to react exactly with 29.40ml of a 0.6M solution of sodium hydroxide

chemistry

how many molecules of calcium are needed to produce 90.87 moles of carbon dioxide? please explain.

chemistry

How many Ca +2 ions in 40.08g of CaCO3 (Calcium Carbonate) I'm unsure on how to approach this problem and set it up.

chemistry

if 200.g of water at 20 degrees celsius absorbs 41840 j of energy, what will its final temperature be?

chemistry

what type of intermolecular bonding would be expected between molecules of carbon monoxide and why?

Chemistry

What is the product of Bromo Blue, CaCl2 (calcuim cloride) and NaHCO3 (baking soda)?

organic chemistry

How many mols of benzoic acid are soluble in 125 mL of water at room temperature.

chemistry

what is the type of packing for body centered unit cell? i put A-B-A-B but my answer is wrong

chemistry

Determine the osmotic pressure (in psi) , at 75.0o F, of an aqueous solution that is 2.60 % sodium sulfate by mass

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