chemistry! URGENT

60,378 results, page 92

Chemistry

How many grams of bromine liquid are needed to make 6 moles of KBr?

Chemistry

What is the mass of 36.0mL of a liquid if its density is 2.70g/mL? is the right answer 97.2 g?

CHEMISTRY

may i please get some notes on stoichiometry because i don't seem to be getting anything.

chemistry

A can of soda has 1.50x10^2 calories. Convert this energy to units of joules.

chemistry

what mass of Ca is needed to completely react with 5.0M of .250ml Copper I Phosphate?

Organic Chemistry

What are the theoretical moles and grams obtainable when 53.9g of ethanol is dehydrated?

Organic Chemistry

What are the theoretical moles and grams obtainable when 53.9g of ethanol is dehydrated?

Organic Chemistry

What are the theoretical moles and grams obtainable when 53.9g of ethanol is dehydrated?

Ap Chemistry

HOw much energy is required to ionize a mole of Hydrogen atoms?

chemistry

how do you calculate density of a substance with a mass of 100g and a volume of 48ml

Chemistry

The media you need has .9% NaCl and 2% glucose. How would you make 1 L of this solution?

chemistry

How much energy (in kilojoules) is released when 21.0 of ethanol vapor at 94.5 is cooled to -19.0?

chemistry

pls. explain why the copper element has two ion charge?

chemistry

calculate the freezing point of 0.1m of a)NaCl (b) glacial acetic acid

lab chemistry

what is the boiling point of 2-propanol at the top of pike's peak

chemistry

If the equilibrium constant for the carboxyl group of glycine is 2x10^-3, what is the pk value?

chemistry

Calculate the number of grams of Fe found when 0.400kg of Fe2O3 reacts

chemistry

How many grams of Al(NO3)3 are needed to prepare 25.0 mL of a 0.750 M aqueous solution.

chemistry

What would be the result if 5.0 L of hydrogen was burned with 2.0 l of oxygen in a closed container?

Chemistry

Calculate the pH of 0.0115M acetic acid solution at 25 degrees celcius with Ka=1.75*10^-5

Chemistry

How many moles of ions are released when this sample dissolves in water? 26.4 g of Ba(OH)2·8H2O

chemistry

If a solution containing 0.22 M Cl -, Br -, I -, and CrO42- is treated with Ag+, in what order will the anions precipitate?

chemistry

how do you get to the ionic equation for sodium hydroxide (aq) reacting with sulphuric acid.

chemistry

how do you get to the ionic equation for sodium hydroxide (aq) reacting with sulphuric acid.

Chemistry

What volume will 12.0 grams of neon gas occupy at 25 degrees C. and 3.05 atmospheres?

chemistry

how to you find the partition coefficient of the benzoic acid in CH2Cl2 in water

chemistry

How many grams of water should you add to 33.0 of sucrose, , to get a 0.795 solution?

CHEMISTRY

WHAT ARE FACTOR FAVOURING THE FORMATION OF A COVALENT BOND SHORT NOTE?

Chemistry

Why is it necessary to correct the pressure of a gas that is collected over water?

Chemistry

If the pressure on a balloon were quadrupled what would happen to the balloons volume?

Chemistry

How many CO2 molecules can be made with 0.500 mol of oxygen atoms?

Chemistry

calculate the mass of 8.766 x 10^ 25 molecules of acetic acid , HC2H3O2

Chemistry(Please check)

What is the oxidation number of chromium in K2Cr2O7 so k=+1 (2) = 2 O=-2(7) = -14 2x + 1 +(-14) = 0 2x-12=0 x=6 so Cr is 6 Is this correct?? Thank you!!

Chemistry

Write a balanced equation for copper oxide + Ethanoic Acid

chemistry

34.42mL of 0.1013 M NaOH is used to titrate a 25.00 mL sample of H2SO

chemistry

The total number of atoms in 0.111 mol of FeCO3(PH3)2...?

Chemistry

how many ions and moles does 113 mL of .490 M aluminum chloride have?

chemistry

What is the pH of a solution prpared by mixing 50.0 ml of .200 M HCLO4 with 10.0 ml of .100 M KOH

chemistry

What is the pH of a solution prpared by mixing 50.0 ml of .200 M HCLO4 with 10.0 ml of .100 M KOH

Chemistry

Explain why it is necessary to form a double bond in the Lewis structure.

organic chemistry

(x/15)/[(1.5-x)/45]=5.8 how do I move these around to find x partition coefficient equation

organic chemistry

(x/15)/[(1.5-x)/45]=5.8 how do I move these around to find x partition coefficient equation

chemistry

describe the neutralisation reactions that take place on everyday basis

chemistry

Account for the increase in reaction rate brought about by a catalyst.

chemistry

Find the normalization constant for the wave function (e^-bx).(e^+bx)(one dimension)

Chemistry

At what temperature (oC) will a gas sample occupy 9.8 L if it originally occupies 14.2 L at 25.9oC?

Chemistry

What would be the number of elements in the fourth row of the periodic table?

Chemistry

Write an equation showing the bicarbonate ion acting as an acid.

chemistry

what will happen when you drop a ball of naphthalene in a 25ml gasoline.will it dissolve or not?

chemistry

how many milliliters of concentrated NaOH(19.3 M) are needed to make 8.00 L of 0.25 M base solution?

chemistry

Calculate [H3O ], [ClO4–], and [OH–] in an aqueous solution that is 0.130 M in HClO4(aq) at 25 °C.

Chemistry

Which ion is more strongly hydrated , 1)Fe3+ and Fe2+? 2)Li+ and Na+ ? Thank for helping!

organic chemistry

what are the formulas of the salts that may precipitate when the reaction mxture is cooled?

Chemistry

What caroxylic acid and alcohol is needed to produce isopentyl propionate?

Chemistry

What carboxylic acid and alcohol is needed to produce propyl acetate?

Chemistry

What carboxylic acid and alcohol is needed to produce isobutyl propionate?

Chemistry

What caroxylic acid and alcohol is needed to produce isopentyl propionate?

Organic Chemistry

If a student extracts first with NaOH then with NaHCO3, what will be the result?

chemistry

a 0.296g of CO2 has a volume of 565ml and a pressure of 425mmHG, what is the temperature??????

chemistry

is this correct? making sure I did this right CH3CH2CH2CH2-Br ans: 1-bromobutane

Chemistry

So what do I do after I divide the mass by 2? Refer to previous question please

Organic chemistry - Nitration

Why does the amount of dinitration increase at high temperatures?

Chemistry

calculate the energy associated with a photon whose wavelength is 14.5*10^-8cm.

Chemistry

Calculate the mass ( in grams) of one mole of methane molecules (to .01 g)

chemistry-wavelengths

what is the wavelength in nm of radiation having a frequency of 2.45x10^9Hz

chemistry

Draw the lewis structure for: SiO3 -2 CNO- TeO4 -2 F2PPCl2 thanks!

chemistry

What is the boiling point of an aqueous solution that freezes at -6.7 degress C. Please help.

chemistry

what is the molarity of an aqueous solution that is 6.75% glucose by mass? Assume a density of 1.03 g/ml

Chemistry

Which of the following substances is capable of reducing bromine, Br2? Cl- H2 Ni or Au I think its H2

Chemistry

Calculate the pH of a solution made with 0.240 M H3PO3 and 0.480 M NaH2PO3.

Chemistry

Describe how you could make approximately 5 g of a 3% (w/w) ferrous ammonium sulfate solution

Chemistry

CH3CH2CH(BR)CH=C(BONDED TO A METHYL ON ONE SIDE AND AN ETHYL ON THE OTHER)

Chemistry

If an atom gains energy, is it in a more stable or unstable state?

chemistry

How many moles of sugar are required to react completely with 3.26 mol of oxygen?

chemistry

Sorryy but I still don't understand will you show the calculations for my previous question

Chemistry

For the reaction 2 N2O <===>O2 + 2 N2 what happens to the equilibrium position if the pressure is increased

Chemistry

Determine which is larger member of each pair A) Mg2+ or Al3+ B) N3- or O2-? Explain

Chemistry

HZ is a weak acid. A concentration of 0.020M in aqueous solution gives a pH of 4.93 what is the Ka?

chemistry

how many moles of Na2SO4 are present in 850cm3 of a solution which has a concentration of .6 mol d/m3

Chemistry

True or false? 1 mole of ozone has 1.8 x 10^24 atoms? correct if wrong THANK YOU!

Chemistry

Which of the two is the stronger base?Give your reason. (a) HPO4 2- or PO4 3- (b)HS- or S2-

Chemistry

Give two bronsted acid-base that are not Arrhenius bases.

Chemistry

Please help me arrange these elements in decreasing order of metallic property. I, Mg, Al, Rb, Ca Thank You

Chemistry

How many grams of C4H10O can be melted by 2.0 x 103 J? Given ÄHfus = 7.27 kJ/mol

chemistry

Determine the molarity of a 2.15-L aqueous solution containing 1.45 moles of KCl.

chemistry

how to prepare 1M,50ml buffer solution by taking Na2HPO4 and NaH2PO4.

Chemistry

Why does only one of these ions (Co, Cu, or Ni) produce a positive flame test?

chemistry

Which of the following does NOT have an angular shape? 1. NH2 - 2. ClO2 - 3. HOCl 4. S3 -2 5. N3 -

Chemistry

Rank the following atoms in terms of decreasing atomic radius. 1. Na, N, O, Mg, F 2. F, O, N, Mg, Na 3. F, Mg, Na, O, N 4. Na, Mg, N, O, F 5. F, O, N, Na, Mg

chemistry

Calculate the pH of an aqueous solution containing 1.6 x 10-2 M HCl, 2.0 x 10-2 M H2SO4, and 1.8 x 10-2 M HCN.

chemistry

Exactly define the number of hydrogen and hydroxide ions at pH 6. What about pH 8?

chemistry

25 G OF CALCIUM CHLORIDE IS DISSOLVED INTO 1500mml OF H2O. how can i set it up.

chemistry

How many grams of ammonia can dissolve in 100g of water at 22 degrees celsius?

chemistry

Conjugate base of acid H3PO4= I have H2PO-4 Is this correct?

Chemistry

What mass of KOH is necessary to prepare 799.2 mL of a solution having a pH = 11.65?

chemistry

here is a redox reaction Fe+ Cu2+„³ Fe2+ Cu Is Fe oxidized and Cu reduced ? and why. Thanks for the help:)

CHEMISTRY

if a beaker has a rated capacity of 100ml, does it mean that it has to be filled to the bream?

chemistry

What is the minimum volume of 2.6 required to completely dissolve 20.0 of potassium metal?

chemistry

Calculate the molarity of a 295 mL solution contain 45 g of ethanol (C2H5OH)

chemistry

why is it necessary to make up to the 250 ml mark while during dilution?

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