chemistry! URGENT

60,378 results, page 82

Chemistry

How commonly is salicylic acid used or found in nature ?

Chemistry

6.2g of NaOH is added to 800ml of water What is the molarity of the solution? What is the pH?

chemistry

Devils food cake has a [H+] of 2.7 x 10-8 mol/L. calculate pH pOH [OH-]

Chemistry

Give two physical properties of ionic compounds? Thanks.

Chemistry

is delta S positive for the heating of water from 25 to 75 degrees Celsius?

Chemistry

How many g of CaCl2 are required to prepare 0.250 L of a 0.200 M solution?

chemistry

How many grams of SrCl2 is required to prepare 1 molar solution of it,

chemistry

why we add acid to the standardization of sodium thiosulphate solution?

Chemistry

1. Convert 1.2 X 10^24 molecules of chlorine to grams. Ans: 70.67 gms

Chemistry

Which molecule would be more soluble in water ? H----C=C---H or BeCl2

chemistry

what is the total number of atoms in the compound (NH4)3PO4?

chemistry

How many molecules are contained in 1.30 mol O2? Answer in units of molec.

Chemistry

Why can't a single spectral line be used to identify an element?

Chemistry-Dr.Bob

Why is gasoline (octane) better than diesal (cetane)?

Chemistry

Why are the atomic masses of elements usually decimal numbers?

Chemistry

A compound contains 69.9% iron and 30.1% oxygen. What is its empirical formula?

Chemistry

When 46.0 ml of 0.18 M HNO3 and 58.0 ml of 0.23 M LiOH are mixed, the concentration of [OH-] after mixing is ?

Chemistry

how can magnesium chloride be lost in a reaction and how can we ensure that it is pure?

Chemistry

What is the equation for the reaction between stearic acid and ammonia?

Chemistry

How much oxygen is needed to form 50 grams of water?

Chemistry

what is the concentration of 0.009 M solution of nh3 at 25 degree fahrenheit?

chemistry

hcl + naoh ==> h2o + nacl limiting reagant

Chemistry

What is the principal of seperation of metal ions in qualitative analysis?

chemistry

summarized the atomic structure and discovery of nucleus and protons

chemistry

using the Kw for pure water, show that: pH = pKw - pOH

chemistry

what mass of excess reactant remians when the reaction is completed?

chemistry

why are there only certain colours in an atomic emission spectra?

chemistry

If 15.22 g of mercury (II) oxide decompose, how many moles of oxygen can be produced?

organic chemistry

is it anything other to form isopentyl propionate

chemistry

What volume of oxygen is required to completely combust 80 of butane

General chemistry i

Is this a redox reaction? 4Cr+3O2 -> 2Cr2O3

Chemistry

what type of reaction occurs in Al+SnCl4 ? and what is the balanced equation

Chemistry

How many mL of 0.101 M HCL are needed to neutralize 1.00 g of potassium hydroxide?

Chemistry

How many millimoles of HCl (aq) are neutralized by 0.35 g of CaCO3 (sol)? mmol

Chemistry

Mole calculations: How much does 2.5 x 10^24 molecules of p2o3 weigh ?

Chemistry

How many grams of solute are in 0.504 L of a 0.350 M K2CO3 solution?

Chemistry

Organic nhi aati smjh... Koi smjhado na

Chemistry

why does the FeCl3 test positive for phenols and not other -OH compounds?

Chemistry

What is the mass of Na2SO4 is needed to make 1.5 L of 3.0 M solution? Na=23 g.: s = 32 g: O=16g.)

Chemistry

What mass of naoh is neutralized by 43.55ml of 0.145m H2SO4?

Chemistry

What is the mass of all atoms in 2Fe+3O2=2Fe2O3

Chemistry

How do i figure out if 2NO2 -> N2O4 is a redox reaction

Chemistry

name the three fundamental particles present in an atom

chemistry

what type of a ligand would 18 crown 6 ether be? hexadentate?

Chemistry

Compare the diffusion rates of hydrogen and oxygen gases.

Chemistry

How many moles of oxygen (O2) are required to completely react with 27.4 mol of H2?

Chemistry

How do I make 500ml of a 0.3% chlorine dioxide solution from 6.4% tablets?

Chemistry

Why is methyl orange not suitable indicator for h2c2o4 and naoh

chemistry

Which one has more hydrogen bonding- ethanol or methanol

Chemistry

Which reagent has been oxidized in the following equation ? H2(g) + N2(g) === NH3(g)

Chemistry

Which reagent has been oxidized in the following equation ? H2(g) + N2(g) === NH3(g)

Chemistry

How many moles of O2 must react with 0.550 mole ofMethanol?

Chemistry

How many grams of NO2 are needed to form 100.0g of HNO3?

Chemistry

If it is known that the iron(ii) salt is FeSO4.7H20 calculate the %Fe from the formula

pre-ap chemistry

how to make 100 mL of a 0.500 M CuSO4 solution

chemistry

who prepaire tris buffer 0.2 mmol/lit calculation

BIO chemistry

What is the pH of a mixture of 0.042M NaH2PO4 and 0.054M Na2HPO4

Chemistry

What mass of CaO, can get by the decomposition of 250 g of CaCo3 with 80% purity?

Chemistry

What is the value for Kb for the formate anion, HCOO-? Ka(C7H5O2)=2.1x10^-4.

chemistry

how do i figure out grams/tablet if I am in units of mol/L? >_>

chemistry

60 gram of urea is dissolved in 250ml. Calculate the molarity

Chemistry

addition of conc H2SO4 to Ph-CH(CH3)OH gives product?????

Chemistry

How many grams of solute are present in 795 ml of 0.130m KBr?

chemistry

calculate the number of moles of Mg in 0.12g(relative mass of Mg=24)

chemistry 12u

how do i calculate this.. a solution of nitrous acid has a pH of 2.73 what is the [H3O+] ?

Chemistry

A solution is 25% by mass calcium nitrate and has a density of 1.21 g/mL what is the molarity?

Chemistry

Concentrated nitric acid is 70% HNO3 and 14.7 M. What is the density of the solution?

Chemistry

How can I make 100ml 0f 2N of HCl? purity is 35% and density is given as 1.18 g/mL

Chemistry

The bond angle of water is decreased from 109Degree 28' to 104Degree 24',why?

Chemistry

Why must not the condensed water drip into the flask?

chemistry

How many grams of CO2 are evolved on heating 200 g of CaCO3.

Chemistry

Which amount of heat is released when 75.0 g of water at 0° C is frozen to ice?

Chemistry

Define indicators giving four examples and their PH ranges

Chemistry

Using benzene as an example to illustrate substitution reaction

Chemistry

a 0.20 mol/l solution of weak base hpo4 has a ph of 9. find the Kb

Chemistry

Identify the compound and classify its functional group in the image H H H H H H H-C-C-C-O-C-C-C-H H H H H H H

Chemistry

a 0.20 mol/l solution of weak base hpo4 has a ph of 9. find the Kb

Chemistry

How many moles are in 7.5x10^24 molecules of carbon dioxide? Grams?

chemistry

what fraction of voids are occupied by sp3 carbon in diamond

Chemistry

Why ionic compounds have high melting points?

chemistry

calculate the normality of 5.56 grams of K2Cr2O7 dissolved in 500 mL

chemistry

caculate the molar concentration of 1ppm solution of NaCl?

chemistry

How many degenerate orbitals have the following name? 2s 3p 5d 4p 5s I don't get this question

Chemistry

What is the amount of oxygen needed to create output 20gm?

Chemistry

What is the kb of a 0.0200 m ( at equilibrium) solution of methyl amine, ch3nh2, that has a ph of 11.40?

chemistry

Calculate the pH of a solution containing 10 g / L of NH4Cl (Kb NH3 = 1.8x10-5

Chemistry

What is the test for ammonium formed on hubber process? i need your help

Chemistry

What volume of nitric dioxied at s.t.p from the below equestion N2+O2=2NO

chemistry

how much ml of oxalic acid is needed to standardize 0.1M NaoH

Chemistry

How much heat is produced by the complete reaction of 5.29 kg of nitromethane?

chemistry

How to solve CoCl2+HO2- ------> Co(OH)3+ Cl- by half reaction method

Chemistry

Describe how lead(II) iodide cen be prepared in the laboratory

Chemistry

The weight of a pure sample of KClO3 to be decomposed in order to get 0.96 of O2.

Chemistry

How many mL of 0.1 N NaOH are required to react with 100 mEq of H2SO4?

CHEMISTRY

Why is glass considered as a supercooled liquid? answer please!!!

chemistry

what is the concentration of na and co3 ions in 0.2M aqueous solution of na2co3

CHEMISTRY

CALCULATE THE DECREASE IN TEMPERATURE FOR 22.0 G SILVER THAT LOSES 625 J

math or chemistry

Check pls. 5.4 x 10^-2 by 2.5 x 10^-3 by 7.9 x10^-3 m volume = 107.44 x 10^-8 m^3

Chemistry

How does hybridisation of PCL5 change when it is decomposed to PCL3 and Cl2?

chemistry

When are more products of a reaction available initially than at equilibrium? A. K = 0 B. Q < K C. Q = K D. Q > K

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