chemistry! URGENT

60,487 results, page 99

chemistry

what is the rate law for NO+O3=NO2+O2 in second order reaction if [NO] Doubled

chemistry

What is the % of a solution containing 18.0g of NaCl in 65 ml of water 18.0/65 * 100 = 27% Right? Wrong?

chemistry

How much heat is produced by the complete reaction of 5.91kg of nitromethane?

Chemistry

How much heat is required to boil 90.0g of water at its boiling point?

chemistry

the wavelength(nm)of a ball bearing with a mass of 10g, and a velocity of 10cm/s is what?

chemistry

In generating the synchronous spectrum, it is not necessary to specify the wavelength range, why?

chemistry

calculate the solubility in grams of KCL3(s) per 100 ml of water

Chemistry

Determine Qsp if 8.7 ml of 2.1 M AgNO3 is added to 1.7 ml of 1.5 M CaCl2 .The Ksp of AgCl is 1.77 x 10^-10.

Chemistry

Determine the pH of a buffer made from 250 ml of 0.50M HF and 150 ml of 0.75 M NaF.

Chemistry

What special precautions should be taken when generating hydrogen gas?

Chemistry

What happens when a burning candy is placed in a jar of carbon(iv) oxide?

Chemistry

What volume of 1.45 H2SO4 is required to neutralize .050L of .75M KOH?

chemistry

Why does acetone evapourate faster than water in terms of intermolecular forces

Chemistry

Determine the pH of a buffer made from 250 ml of 0.50M HF and 150 ml of 0.75 M NaF.

Chemistry

If 125 g of ice at 0.0°C is added to 1.95 L of water at 90 °C, what is the final temperature of the mixture?

chemistry

109% of carbon,18,2% of hydrogen and 73% of oxygen how do i calculate emperical formular?

chemistry

How can I change ca(hco3)2+cl(aq)=cacl2(aq) + co2(g) + h2O in to ironic equation?

Chemistry

Did Dalton and Thomson believe that the atom was made of solid mass?

Chemistry

analyze and describe the different types of genetic mutations and their effects

Chemistry

Balance TeO3^3- + N2O4 --> Te +NO3^- using oxidation numbers

college chemistry

Calculate the molarity (M) of 156.2g of H2SO4 in 1.275L of solution.

chemistry

Which of the following numbers is most significant (a)2000 (b)2.00033 (c)6.67×10 (d)0.000122

Chemistry

How energy is needed to vaporize 100 g of ethanol from its boiling point?

Chemistry

For an equation N2(g)+3H2(g) double arrowed to give 2NH3(g) what is the catalyst?

chemistry

Why can't lead chloride be directly prepared by adding hydrochloric acid?

chemistry

find the molar mass of 7.5gm of a gas occupying 5.8 lt volume at s.t.p.

chemistry

What volume of 0.5M H2SO4 will exactly neutralise 20cm3 of 0.1MNaOH solution?

chemistry

How many grams of table sugar (C12H22O11) will be needed to make 3.5 L of a 11.5 M solution?

AP Chemistry

The formula for rust can be represented by Fe2O3. How many moles of Fe are present in 24.6 g of the compound?

Chemistry

How many joules of heat are required to raise the temperature of 550 g of water from 12°C to 18°C

Chemistry

How many joules of heat when a 640 g piece of copper cools from 375° C to 26° C

Organic chemistry

What type of alcohol is used in the production of alcoholic beverages?

chemistry

how much grams of cao is produced by oxidation of 1gm of calcium

Chemistry

How many moles of acetic acid are present in 10.00 mL if the concentration is 0.500M HC2H3O2?

chemistry

Balance by partial methods P4 + hno3 = h3po4+ no2+h2o

Chemistry

A compound contains 84% carbon and 10% hydrogen.find the emperical formula.

chemistry

vapour density of gas is 11.2 volume occupied by 22.4gms at STP?

Physical Chemistry

If 5.00 mL of 3% H2O2 is decomposed, how many mL of gas will be produced at 1.01 bar and 25C?

Chemistry

For the combustion of 100. gm of methane, how much heat would be generated?

Chemistry

Calculate the amount of hydrochloric acid in 25cm3 of 0.100M HCl

Chemistry

If you have light that has a frequency of 2.88 x 10 to -9 power Hz, what is the wavelength? I don't know how to do this and what formula to use.

organic chemistry

the color change at the endpopint should persist for 30 second why

Chemistry

How do halogens (Cl2, Br2, I2) react with halides (Cl-, Br-, I-)? Can we explain this reactivity?

chemistry

What is the mass percent of nitrogen in ammonium carbonate, (NH4)2CO3?

chemistry

The density of an elemental gas is 2.14 kg/m3 at STP. What is its approximate molecular weight?

chemistry

Name a metal which is found in liquid state at ordinary temperature?

Chemistry

How much KNO3 will dissolve in 200ml of water at 50 degrees Celsius?

Chemistry

List Sn , Sn2+, Sn4+ in order of decreasing ionization energy

Chemistry

How can I tell from a graph of temperature vs. time if a reaction is endothermic or exothermic?

Chemistry

Why does the temperature in exothermic reactions increase, reach a maximum, and then decrease?

Chemistry

How many ml of water must be added to 40.0 ml of 2.50 m koh to prepare a solution that is 0.212 m?

Chemistry

Ion flame test Why is it important to not let the wooden splint burn ?

chemistry

Calculate the energy difference for the transition of n=6 to n=2 for 1.00 mol of hydrogen atom?

chemistry

How many grams of Ca(OH)2 can be dissolved in 550mL of a .0500 M NaOH solution. Ksp - Ca(OH)2 is 5.5 x 10-5

Chemistry

Does adding a proton to lithium-7 make it a positively charged ion?

Chemistry

Determine the number of grams of water in 7.00 g of copper(II) sulfate pentahydrate.

Chemistry

If 0.400ml CH3CO2H and 0.200ml of 0.100M NACH3COO What is the pH of the resulting solution.

Chemistry

How to I find the spectator ions of BaCl2+K2SO4->2KCl+BaSO4

chemistry

find the percentage by mass of nitrogen present in (NH4)2SO4

chemistry

how do you go about to find the grams that will react with 90g acetic acid

chemistry

The solubility of Na3(PO4) is 0.025 M. What is the Ksp of sodium phosphate?

Chemistry

Which element's 4+ ion would have the following electron configuration? [Kr]4d^10

ics

Chemistry,what is the k.e of 4 moles of nitrogen gas at 127 degree centigrade?

Chemistry

Predict the Order of increasing bond length for (i) H2(g) (ii) I2(g) (iii) F2(g) I don't know how I should know

Chemistry

What is the frequency of the photons emitted by hydrogen atoms when they undergo transition from n=4 to n=3?

Chemistry

2.0 gram of C2H4 is reacted withO2. What mass of water is produced?

Chemistry

Explain what would happen if a saturated solution of kno3 at 50°c is heated

Chemistry

CO(g) effuses at a rate that is ______ times that of Xe(g) under the same conditions.

Chemistry

What will happen if 100g of NaCl is placed in 200mL of water at 70C

Chemistry

How many miles of oxygen would it take to react with 1.0 moles of magnesium

Chemistry

How many joules are needed to change 163.34 g of water at 54.1 °C to steam at 100 °C?

chemistry

Calculate the molarity of a 6% solution of ammoniun nitrate of density 1.025 g/mL

chemistry

Which among hydride, methyl or phenyl shift is the most preferred?

chemistry

Report the preparation of stock solution of 0.04M of sulphoric acid

chemistry

report on the preparation of 0.004M stock solution of ethanoic acid

chemistry

How many grams do 6.2×1024 atoms of argon weigh? Answer in units of g.

chemistry

How many molecules are in 0.0700 mol NH3? Answer in units of molec.

Chemistry

How many grams of aluminum sulfate are produced if 15.7 g Al reacts with excess CuSO4?

Chemistry

What happens if we add 200 mg of calcium hydroxide in 100 g of water at 20 ° C?

chemistry

Ans me plxxx Identify the hydrogen bonding in DNA and ice......

chemistry

How does salt affect the boiling point of water? (in simple words)

Chemistry

Determine the number of grams present in 3.11x 10^23 atoms of water

Chemistry

Which of the following has the lowest conductivity when dissolved ? F2, H2O, MgO, or LiCl

Chemistry

In interhalogen compounds of the type Ab5 and AB7, B is invariably flourine,why ?

Chemistry

Why do argon and flourine not form compounds like Xenon Flourides?

Chemistry

in paramagnetic ions all the bonds formed between Mn and O are covalent,why?

Chemistry

the ka value of 0.001moldm-3 solution of a weak acid is 1.6*10-6 calculate the ph and the pka

Chemistry

concentration of H30+ in 0.0250 moldm-3 aqueous epuation of HCL

chemistry

volume of 0.5 N sodium hydroxide required to neutralize 20 ml of 0.1 N acetic acid ?

Chemistry

At what pressure would 0.150 mole of nitrogen gas at -23.0^o C occupy 8.90 L ?

Chemistry

If the density of a gas is 1.2g/L at 745.torr and 20 Celsius, what is the molecular mass?

Chemistry

Calculate the following and write your answer in scientific notation 6.6 x 10^6 (8.8 x10^2) x (2.5 x 10^3)

CHEMISTRY

find the concentrations of H+, HCO3-, CO3 2- in a 0.025M in H2CO3 solutions

chemistry

The formula for rust can be represented by Fe2O3. How many moles of Fe are present in 27.6 g of the compound?

Chemistry

A 0.10M solution of a certain monoprotic weak acid has a pH of 2.44. Calculate Ka.

Chemistry

How is 4FeS2 + 11O2 = 2Fe2O3 +8SO2 a single replacement reaction?

Chemistry

How much concentrated 12 M HCl is needed to prepare 200 ml of a 2.5 M solution?

Chemistry

Can you determine the limiting reactant just by comparing the masses of the reactants?

Chemistry

what mass of NaCl do you need to make a 500mL of a 0.10M solution?

Chemistry

C + HNO3 = CO2 + NO2 + H2O oxidation, reduction and balancing

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