chemistry! URGENT

60,827 results, page 92

chemistry

how many half-lives of radon-222 have passed in 11.46 days?

chemistry

Malarity is to moles of solute over liters of solution as molality is to

Chemistry

In Zinc blend structure (r[zn2+]+r[s2-]) is equal to? (if edge lenght is a)

Chemistry

Complete each of the following nuclear equations: a. 239/92U - ? + o/-1e b. 11/5B - 7/3Li + ? thank you!

chemistry

What are the effects on chemical equilibrium of following; Temperature , Concentration and Pressure.

chemistry

why the thermal stability decreases across the period in s-block elements ?

chemistry

What is the concentration of a solution containing 25g of NaCl in a 250mL sample?"

Chemistry

How many grams of Mg are needed to react completely with 3.80 L of a 2.50 M HF solution? Mg + 2HF MgF2 + H2

Chemistry

Name the three products formed when tin(II) nitrate is heated. Thank you.

Organic Chemistry

What will be the result when ketone is added with ethylene glycol and TsOH?

chemistry

What volume does 627 cm3 of a gas at 14°C occupy at 40°C, if the pressure does not change?

chemistry

how much hydrogen gas evolves on electrolysis of 1 liter of water?

chemistry

what is the experimental errors in determining the formula unit of zinc chloride?

chemistry

is energy considered a chemical reaction that is important to a healthcare professional

Chemistry

How many milliliters of 1.237 M HCl are required to react with 27.02 grams of MgCO3 ?

Chemistry

When 320.62 grams of Bi2O3 react with excess of C, how many moles of Bi form?

Chemistry

For the reaction HNO3+HCl=NO2Cl+H20 What is the equilibrium constant at 25 C and 75 C

chemistry

What is [H+] concentration in a 4M aq solution of acetic acid (Ka= 1.8 E-5)? what formula do you use to get the answer?

chemistry

can O3, AsH3 and H2Se act as a lewis acid? please explain.

chemistry

can O3, AsH3 and H2Se act as a lewis acid? please explain.

chemistry

what is an ionic compound that forms an acid-base neutralization reaction?

Chemistry

I need help writting a formula for: AgNO3(l) + PbNO3(l) + HgNO3(l) + HCl (l)

chemistry 101

How many grams of oxygen are in 40.1 g of calcium hydroxide? options: 17.3 g 8.64 g 20.1 g 0.541 g 11.2 g

chemistry

a gasoline tank has a mass of 60 kg and a density of .752 gcm^3 what is the volume

Chemistry

What is the molarity of a solution containing 40 grams of NaOH in 100 ml of soution

chemistry

Explain how the addition of a solute affects the vapor pressure of the solvent.

Chemistry 111

What is the mass of 7080 moles of magnesium chloride (MgCl2)?

chemistry

How many grams of KMnO4 should be used to prepare 2.00 L of a 0.500M solution?

chemistry

What volume of 0.25M solution can be made from5.0 gof KCl?

chemistry

How many grams of CuCl2 are required to make 75 mLof a 0.20M solution?

chemistry

1-why should the maximum percent yield never be above 100%?

chemistry

A level teaspoon may contain 4.0 grams of NaHCO3. How many moles does this represent?

chemistry

why do you use Na2Co3 extract solution tor the analysis of anions

chemistry

an example of a transition element having completely filled d-orbital is zn Ti v Cr

chemistry

which of the following correctly compare the rate of diffusion of oxygen to that of hydrogen 1) 1:4 2) 4:1 3) 16:1

chemistry

how can I prepare sebacoyl chloride from sebacic acid with excellent yield?

chemistry

What happens to the physical properties as the strength of intermolecular forces increases?

chemistry

explain fisrt ionization energy across period three

chemistry

give a balanced equation between phosperuos and sodium hydroxide

chemistry

What will be value of molarity and strength %w/v respectively 30V H2O2 solution

chemistry

calculate the number of moles of sodium carbonate in one dm3

Chemistry

What is the chemical reaction between Phosphoric Acid and Disodium Phosphate?

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?

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