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Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

ap chemistry
Ammonia decompose upon intense heating to produce nitrogen and hydrogen elemental products. Write a balanced equation and then use stoichiometry problem solving to determin the mass of nitrogen product that can form if exactly 25.50g of ammonia is fully decomposed.

chemistry
Ammonia decomposes upon heating to produce nitrogen and hydrogen elemental products. Write a balanced equation and then use stoichiometry problem solving to determin the mass of nitrogen product that can form if exactly 25.50 grams of ammonia(NH3) is fully decomposed.

chemistry
A major component of gasoline is octane C8H18. When octane is burned in air, it chemically reacts with oxygen gas O2 to produce carbon dioxide CO2 and water H2O. What mass of octane is consumed by the reaction of 8.8g of oxygen gas? Round your answer to 2 significant digits.

ap chemistry
use dimensional analysis to find how many moles of nitrate ions are in 40.0 mL of a 0.75 M aqueous solution of aluminum nitrate

Chemistry
Define normality

Chemistry
If 0.500 mol of each of the following solutes is dissolved in 2.0 L of water, which will cause the greatest increase in the boiling point of the solution? A. KI B. CO2 C. Na2SO4 D. NaCl

Chemistry
If 0.500 mol of each of the following solutes is dissolved in 2.0 L of water, which will cause the greatest increase in the boiling point of the solution? A. KI B. CO2 C. Na2SO4 D. NaCl

Chemistry
If 152 grams of ethane (C2H6) are reacted with 231 grams of oxygen gas, what is the excess reactant? 2C2H6 + 7O2(g) → 4CO2(g) + 6H2O(g)

chemistry
how many representative particles are there in 5 mole h2o

chemistry assignment
A laboratory instructor gives a sample of amino acids powder to each students,1,2,3and4,and they weigh the samples.The true. value is 8.72g.Their results for three trials are 1:8.72g,8.74g,8.70g 2:8.56g,8.77g,8.83g 3:8.50g,8.48g,8.51g 4:8.41g,8.72g,8.55g.(a)calculate the ...

chemistry
which acid produces brown fume on heating?

Chemistry
Consider the following reaction between sulfur trioxide and water: SO3(g)+H2O(l)→H2SO4(aq) A chemist allows 61.5 g of SO3 and 11.2 g of H2O to react. When the reaction is finished, the chemist collects 51.0 g of H2SO4. Determine the percent yield for the reaction.

Chemistry
Equal weight of methane and hydrigen are mixed in an empty container at 25°C. The fraction of the total pressure exerted by hydrogen is

Chemistry
How many grams of NaCl are presented in 250g of salt solution containing 9% NaCl?

Chemistry
100g of calcium carbonate was decomposed by heating to produce 45g of calcium oxide and carbon dioxide, using the equation given, calculate the Percentage Yield of Calcium Carbonate. CaCO3 -------> CaO + CO2 Please help me i tried working out but kept on getting stuck after...

Chemistry
Lipoprotein is a technique for removing fat deposits from various areas of the body. How many liters of fat would have to be removed to result in a 5.0 IB weight loss? The density of human fat is 0.94 g/mL.

chemistry
why is helium considered a noble gas?

Analytical Chemistry
This question pertaining to buffer systems! How would you prepare 10.0mL of 0.0100M phosphate buffer, pH = 7.4 0, from stock solution of 0.100M KH2PO4 and 0.250M K2HPO4, pKa of KH2PO4 is 7.20. Please help me in figuring out how I even start this problem...as well as attempting...

chemistry
calculate the mass of potassium hydrogen phthalate needed to prepare a 0.1M solution in a 250 ml volumetric flask given that the molar mass of potassium hydrogen phthalate is 204,23g/mol

Chemistry
Death Valley in California is 86 m below sea level. Will the partial pressure of oxygen in Death Valley be the same, lower or higher than the partial pressure of oxygen at sea level? A. higher B. impossible to tell without additional information C. the same

Chemistry
The gas in a cylinder has a volume of 8 liters at a pressure of 108 kPa. The pressure of the gas is increased to 224 kPa. Assuming the temperature remains constant, what would the new volume be?: _______L How would I go about solving this particular problem? Thanks! :)

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

Chemistry
Rearrange the titration calculation to find Mb in a solution. If I put 13.2 mL of NaOH and 0.3 mL of phenolphthalein in 25 mL of KHP, what is the Mb of the solution? The original solution of NaOh is 100 mL and is composed of 1.069e-15 moles of H+, 9.445e-2 moles of OH-, and 9....

Chemistry
sample of silver metal is suspected to be contaminated with zinc. A 0.2365 g portion of this metal is dissolved in nitric acid and the silver ions precipitated with excess aqueous NaCl. After filtering and drying, the mass of the precipitate is found to be 0.2865 g. What was ...

Chemistry
Mercury has a melting point of - 38. 9°C. what would this read in degrees Fahrenheit the and kelvin

Chemistry
The following soluble salts are strong electrolytes. For each, write a balanced equation for their dissociation in water. NaBr BaBr2 Li3PO4

Chemistry
If the pH of a 0.46 M aqueous solution of a weak base is 9.2, estimate the Kb of the base:

analytical chemistry
what is the solubility of PbI2in g/L ,if the solubility product is 7.1 ?

analytical chemistry
the solubility product of Bi2S3 is 1.0 and that of HgS is 1.0. which one is the least soluble under a given temperature 6

chemistry
Consider the titration of 40.0 mL 0.250 M ethylamine, C2H5NH2, with 0.350 M HCl. Determine each of the following and sketch the titration curve. Kb of ethylamine = 5.6x 10-4 a. The volume of added acid required to reach the equivalence point. b. The initial pH. c. The pH when ...

chemistry
what amount of ammonium chloride that will separate out when 55g of its solution at 373k is cooled to 273k(solubility at 373k -55g and at 273k - 37g)

Chemistry
1.5mL of a 0.05M solution of calcium chloride (CaCl2) was diluted with water to a volume of 10L. What was the concentration of Cl- ions in the diluted solution in ppm.

Chemistry
What is Anta basic substance?

chemistry
In which direction, on ceiling, floor or walls, the pressure exerted by air in a room will be maximum. Justify your answer

Chemistry
An antifreeze solution is prepared containing 40.0 g of ethylene glycol (molar mass = 62.0 g/mol) in 60.0 g of water. Calculate the freezing point of this solutions A.-20.1°C B.0.518°C C.20.1°C D.120.1°C

Chemistry
Write chemical formulas for the compounds formed by the following positive and negative ions: Ba2+ and NO3-, Al3+ and Co3, and K+ and PO43-

Chemistry
If you start with 4.00 moles of C3H8 (propane) and 4.00 moles of O2, how many moles of carbon dioxide can be produced?

Chemistry
Electrochemistry In the electrolysis of aqueous copper(II) bromine CuBr2(aq, 1.00 g of copper is deposited at the cathode. How many grams of bromine are produced at the anode?

Chemistry
What are 2 allotropes of carbon? Could you please compare the physical and chemical properties....

Chemistry
How do you determine the polarity of a substance? Example?

Chemistry Theory
We are able to "see" the shapes of molecules with X-ray crystallography. However, even without this technology, there is a great deal of evidence that water, H2O, is a bent, polar molecule. Discuss this evidence and explain how it relates to our model of the water molecule.

chemistry
Using dissociation constants from Appendix D in the textbook, determine the value for the equilibrium constant for each of the following reactions. (Remember that when reactions are added, the corresponding equilibrium constants are multiplied.) (i) HCO−3(aq)+OH−(...

Chemistry
Downlad Project

Chemistry
if the solubilty of AgC2H3O2 is 5.0 x10^-2mol/L. What is the Ksp?

Chemistry
if 1.7L of a saturated solution of AgC2H2O2 is found to contain 14.1g of AgC2H3O2. What is the Ksp of AgC2H3O2?

Chemistry
A voltaic cell, with Ecell = 0.180 V at 298K, is constructed as follows: Ag(s)|Ag+(satdAg3PO4)||Ag+(0.135 M )|Ag(s) What is the Ksp of Ag3PO4?

Chemistry 12th
How can you prepared to benzo phenol from phenyl magnetium bromide

Chemistry
Calculate the pH of the buffer formed by mixing 50.0mL of 0.200 F NaH2PO4 with 50.0mL of 0.120 F HCl

Chemistry
A 50.0 mL solution with analytical concentration of 0.100M in HClO4and 0.080M in formic acid is titrated with 0.200M KOH. Calculate the pH after addition of the following volumes of titrants: a) 0.0, b)20.0, c) 25.0, d)35.0, e)45.0, f)50.0

Chemistry
A glass of water contains 1.2 x 1024 molecules of water. An additional 4.0 moles of water are poured into the glass. How many moles of water are in the glass?

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

Chemistry
C2D3 has a solubility product constant of 9.14×10−9. What is the molar solubility of C2D3? Express your answer with the appropriate units.

Chemistry
How many grams of Nitrogen contains same number of neutrons as 6grams of 12C?

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

General Chemistry
what is the value of Kc if PbCl(s)=1.5g, [Pb2+]=1.6*10^-2 M and [Cl-] =3.2*10^-2 M at equilibrium? (The molar mass of PbCl(s) is 278 g/mol and its density is 5.85g/cm^3.)

Chemistry
What is the concentration of a monoprotic weak Acid if its pH is 5.50 and its Ka= 5.7 x 10^-10?

Chemistry Grade 12
If the concentration of I^-1 is found to be 2.4 x 10^-3 mol/L in a saturated solution of PbI2. What is the Ksp of PbI2?

Chemistry
Why wash water in experiment limiting reagent has to be kept warm at 80-90 degree celcius . Explain why

Chemistry
I need to draw a line angle structure of ibuprofen that shows hydrogen bonding and I am stuck. Can anyone help?

Chemistry
You discover a new cell type that contains measurable amounts of silver ions (Ag+) in it. You find that the concentration of Ag+ inside the cell is still 10 times lower than the concentration outside. Calculate the amount of membrane potential that results from this amount of ...

Organic Chemistry
Is helium considered a noble gas?

Chemistry Grade 12
If the concentration of CN1- is found to be 1.4 × 10-6 mol/L in a saturated solution of AgCN, what is the Ksp of AgCN?

chemistry
15gm of sodium chloride is present in one kilogram of solution.express the concentratiom in ppm and ppb

chemistry
what volumes of 6M hcl and 2M hcl should be mixed to get two litres of 3M hcl

Chemistry
If 0.896g of a gas occupies a 250mL flask at 20 degree celcius and 760 mmHg of pressure, what is the molar mass of the gas?

chemistry
what volume of a 0.5M solution of sulphuric acid is required to prepare 2 litres of a 0.4M solution of the acid

chemistry
15mg of sodium chloride is present in 1kg of solution. express the concentration in ppm and ppb.

Chemistry
Rank the following molecules in order of water solubility. ch3ch2ch2ch3, ch3oh, nacl, and ch3chohcooh

chemistry
Dissolve 50g of sodium hydroxide in 1 litres and determine the normality

Chemistry
How much H3PO4 is needed to neutralize 1 liter of a 0.75M solution of NaOH? (in moles)

Chemistry
Which value is most likely to be the pH of a salt that is formed by the reaction of a strong acid and a weak base

Chemistry
When zinc metal is reacted with hydrochloric acid, zinc chloride and hydrogen gas are produced. If 25ml of 0.2M HCl and 0.3g of zinc metal is used: a. how many M of zinc chloride will be produced? b. how many M of zinc chloride will be produced if 0.5M of HCl was used? c. how ...

Chemistry
What volume of nitrogen dioxide (in L) is produced from the complete reaction of 16.87 of lead (ii) nitrate at STP

Chemistry
How much oxygen will we get from 120 grams of KClO3?

Organic Chemistry
Why is helium considered a noble gas?

Chemistry
250ml solutions is prepared on dissolving 20g NaOH. Calculate the molarity of solution

12th grade Chemistry
BOND BREAKING AND BOND MAKING: Determine by calculations and energy level diagrams, to proof whether these two reactions are endothermic or exothermic reactions.. 1. Methane burns in oxygen 2. Nitrogen (II) reacting with oxygen producing nitrogen monoxide.. please anyone just...

Chemistry
Why Fe(III) can be estimated in acidic medium by dicromet not by permanganet? — please give answer basis on value of reduction potential

Chemistry
Determine by calculation and diagrames to proof whether these two reactions are endothermic or exothermic .. 1. Methane burns in oxygen 2. Nitrogen (II) reacting with oxygen producing nitrogen monoxide.

chemistry
pH of 1.0 x 10-8 M RbOH

chemistry
Nylon 88 is made from the monomers H2N(CH2)8NH2  and  HOOC(CH2)6COOH.  So, would you characterize nylon 88 as rather an addition or a condensation polymer? Please explain your answer

chemistry
Vanadium is an environmental pollutant originating from some types of steel, but also from the combustion of fossil fuels. The amount of V2+ in an unknown sample is determined by potentiometric titration by 7.62 mM permanganate ion, MnO4 - . 25.00 mL of unknown was titrated ...

chemistry
You can temporarily receive relief from acid indigestion by using an antacid that contains a base. Why is it not a good idea to use an antacid routinely? (2 reasons)

Analytical Chemistry
I am having major issues with this problem and I no clue where to start. It also doesn't help that the professor never taught us how to calculate mass % from data like this... Students in the analytical chemistry class were given a sample of spinach to determine its iron ...

Chemistry
A solution of 0.211 M NaOH is used to titrate 24.0 mL of a H2SO4 solution. If 19.0 mL of the NaOH solution is required to reach the endpoint, what is the molarity of the H2SO4 solution? H2SO4(aq)+2NaOH(aq)→2H2O(l)+NaSO4(​aq)

Chemistry
Static charge can interfere with the production of plastic products by attracting dust and dirt. to reduce it, manufacturers expose the area to polonium-210, which has a half-life of 138 days. How much of a 25.0-g sample will remain after one year (365 days)? N = N0(1/2)t/T...

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

chemistry
molar solubility of nitrogen at 25 degree celcius

Math
In a group of 500 students, 150 are studying physics, 220 are studying biology, and 100 are studying chemistry. At least 25 students are studying more than one of these sciences. What is the greatest possible number of these students that might NOT be studying any of these ...

Chemistry
For two questions below, first write and balance the equation for the chemical reaction.  Please, also review the material in Chapter 8, if you will feel you might need it in order to answer the questions.  Next, please answer the following questions: (a) What substance is...

Chemistry
Express each aqueous concentration in the unit indicated. 45 ppm NO3 -, as molarity of nitrate ion in [mol NO3 - /L].

Chemistry
The atmosphere contains about 5.2 x1015 t of air.  What mass in metric tons of carbon dioxide is in the atmosphere if the concentration of CO2 is 395 ppm?

Chemistry
For the system, H2(g) + X2(g) <--> 2HX(g), Kc = 24.4 at 300 K. A system was charged with 2.00 moles of HX in a 3.00 liter container. The catalyst was introduced using a remote unit, and the system was allowed to come to equilibrium. How many moles of H2(g) will be ...

chemistry
Assuming all gases are at the same temperature and pressure, how many milliliters of hydrogen gas must react to give 41.0 mL of NH3? 3H2(g)+N2(g)→2NH3(g)

Chemistry
How many grams of hydrogen peroxide (H2O2) must be added to 1,500 ml of water to produce a concentration of 1.33 m (molal solution)?

Chemistry
For the teaction system, 2SO2(g) + O2(g) <--> 2SO3(g), Kc has a value of 4.62 at 450.0K. A system, at equilibrium, has the following concentrations: [SO3] = 0.254 M, [O2] = .00855 M. What is the equilibrium concentration of SO2(g)? The correct answer is 1.28M, but I don'...

Chemistry
The human body obtains 885 kJ of energy from a chocolate chip cookie. If this energy were used to vaporize at 100 degree Celsius, how many grams of water could be vaporized? The heat of vaporization of water at 100 degrees Celsius is 40.7 kJ/mole.

chemistry
The compete oxidation of 2g of an aldehyde A by acidified potassium chromate produces 2.1g of carboxylic acid B which is dissolved in 50 ml of distilled water . The obtained solution reacts with exactly 1.05 g of solid lime to form salt C a) Write the equation of the reaction ...

Chemistry
How many liters of HCl acid needed to dissolve at 1 ton of carbon and how long would it take?

Chemistry
How many grams of O2 are there in a 50.0L tank at 21*C when the pressure is 1.19x10^4mmHg?

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