Tuesday
February 9, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
51J of heat added to an aluminum can with a mass of 25.5 g what is temperature change if specific heat capacity is 0.903 J/ g degrees Celsius?
Friday, January 29, 2016 by Anonymous

Chemistry
Can enzymes be called Polymers ?
Friday, January 29, 2016 by Miicchi

Chemistry
Dr.Bobb222 please help balance the following oxidation-reduction reactions, which occur in acidic solution, using the half-reaction method. (Use the lowest possible coefficients. Include states-of-matter under the given conditions in your answer.) (a) NO3−(aq) + Pb(s) &#...
Friday, January 29, 2016 by Joanaleine Ferrera

chemistry
If 20 mole of potassium react with an excess of lithium sulfate , how many moles of potassium sulfate can you expect to form. porassium phosphate to potassium sulfate: 20 x 2 kaso4 x 174.259 / 212.267 /2 = 16.4188498448 lithium sulfate to potassium sulfate: 62 x 2kaso4 x 174....
Thursday, January 28, 2016 by Boberto

chemistry
if 10.3 lithium sulfate react with an abundant amount of potassium phosphate, what mass of lithium phosphate can you expect to isolate? lithium sulfate to lithium phosphate : 10.03 x 3 li3PO4 x 115.79 Lipo4 / 109.94 liSo4 / 3 LiSo4 = 10.9016179159 potassium phosphate to ...
Thursday, January 28, 2016 by Boberto

chemistry
How much water could you make? blanced equation : 4 C7H5N3O6 + 5 O2 = 6 N2 + 12 CO2 + 10 H2O + 16 C.
Thursday, January 28, 2016 by Boberto

Intro to Chemistry
2 Na + 2 H20 --> 2 NaOH + H2 is this the balanced equation? and How do I find calulate the % yield of the products?
Thursday, January 28, 2016 by Kimmy

Intro to Chemistry
Balanced Equation C3H8 + 5 02-->3 CO2+ 4H20 Calculate the % yield of the products. How do I do this?
Thursday, January 28, 2016 by Kimmy

chemistry
Consider the reaction Select a possible mechanism for the reaction. Step1:2X2Y+Z2→2X2YZ (slow)
Thursday, January 28, 2016 by Tayebeh Asadi

chemistry
Consider the reaction Select a possible mechanism for the reaction. Step1:Step2:2X2Y⇌X4Y2 (fast)X4Y2+Z2→2X2YZ (slow)
Thursday, January 28, 2016 by Tayebeh Asadi

chemistry
Consider the reaction Select a possible mechanism for the reaction. Step1:Step2:X2Y+Z2→X2YZ2 (slow)X2YZ2→X2YZ+Z (fast)
Thursday, January 28, 2016 by Tayebeh Asadi

chemistry
Consider the reaction Select a possible mechanism for the reaction. Step1:Step2:X2Y+Z2→X2YZ+Z (slow)X2Y+Z→X2YZ (fast)
Thursday, January 28, 2016 by Tayebeh Asadi

chemistry
Consider the reaction Select a possible mechanism for the reaction. Step1:Step2:Step3:Z2→Z+Z (slow)X2Y+Z→X2YZ (fast)X2Y+Z→X2YZ (fast)
Thursday, January 28, 2016 by Tayebeh Asadi

chemistry
Consider the reaction 2 X2Y+Z2 ⇌ 2 X2YZ which has a rate law of rate= k[X2Y][Z2] Select a possible mechanism for the reaction.
Thursday, January 28, 2016 by Tayebeh Asadi

Analytical chemistry
The hydrogen sulfide in a 79.168 g sample of crude petroleum was removed by distillation and collected in a solution of CdCl2. The precipitated CdS was then filtered, washed and ignited to create CdSO4. Calculate the percentage of H2S in the sample if 0.122 grams of CdSO4 was ...
Thursday, January 28, 2016 by Sam

General Chemistry
I have been going at part B of this problem for a few hours. I've completed an ice table and calculated the total number of moles based off pressure but am still unable to come up with the partial pressures. If someone could provide the steps for solving I would appreciate...
Thursday, January 28, 2016 by Duke

Chemistry 101
A spherical bass has a diameter of 1.00 inch and a mass of 2.00 grams. Will the ball float or sink water? Remember that if the ball's density if greater than 1.00 g/mL the density of water, the ball will sink. Also remember to use dimensional analysis.
Thursday, January 28, 2016 by Lilly

Chemistry 101
A piece of metal weighing 10.65 grams releases 3450 joules of heat energy when it is cooled from 99.9c to 28.5c. Wheat is the specific heat capacity of the metal in J/g c..
Thursday, January 28, 2016 by Lilly

Chemistry 101
A rectangular prism has these dimensions and mass: length = 12.6 cm,, width = 1.256 feet, and thickness = 456 mm. Its mass is 1.2347 pounds. Determine its density in g/cm^3.
Thursday, January 28, 2016 by Lilly

chemistry
A given mass of gas has a volume of 7.5dm at 250k and 80kmm3,calculate the pressure at which it will have a volume of 7.2dm3 at 270k?
Thursday, January 28, 2016 by Blessing

Chemistry
A student has placed a mixture of CaO and CaO, 4.88 g of dough into a flask containing 1.46 L of carbon dioxide at 35 ° C and 746 mmHg. After completing the reactions, it found that CO2 pressure had decreased to 353 mmHg.Calcule the percentage composition of the mixture
Thursday, January 28, 2016 by Emma

Chemistry
If 0.812g of calcium reacts in a coffee-cup calorimeter that contains 400.0g of water/ The initial temperature of the water is 17.9°C, the final temperature is 26.0°C. Calculate the standard molar enthalpy change for this reaction.
Thursday, January 28, 2016 by Gem

Chemistry
Construct a Born Haber cycle for the formation of calcium oxide showing clearly using equations, the steps of the enthalpy stages involved
Thursday, January 28, 2016 by Demario

Chemistry
Question from text: "The reaction between phosphorus and chlorine is described by the equation, P4(s) + 6 Cl2(g) ↔ 4 PCl3(l). At equilibrium, the concentration of Cl2 is found to be 0.87 M. Calculate Keq." Keq = [PCl3]^4 / [P4] [Cl2]^6 I am not seeing how to ...
Thursday, January 28, 2016 by Jennifer

Chemistry
What is the volume of the container needed to store 0.8 moles of argon gas at 5.3 atm and 227°C? (Given: R = 0.08205 l · atm/mol · K)
Thursday, January 28, 2016 by Abigail

Chemistry
What is the temperature of a 100 liter container having 1 mole of an ideal gas at a pressure of 20 kilopascals? (Given: R = 8.314 l · kPa/K · mol)
Thursday, January 28, 2016 by Abigail

Chemistry
Xenon tetrafluoride gas is placed in a 3 liter container at 80°C. The pressure of the gas is found to be 0.117 atm. How many moles of the gas are in the container?
Thursday, January 28, 2016 by _

Chemistry
Given that ΔH (fusion) of water is 6025 J/mol, Cp,m(ice) = 37.7 J K–1 mol–1, and Cp,m(water,liquid) = 75.3 J K–1 mol–1, calculate ΔG (in J) for the freezing of 89 moles of water at 1 atm pressure and the constant temperature T = 14.4 °C. I got...
Thursday, January 28, 2016 by Brian

Chemistry
Crystal of Sodium form Cubic unit cell with edge length 430pm.Find the no.of atoms present per unit cell and also the type of unit cell. P.S. No radius or density is given so its a lil bit tough dan the rest... Plz Help ASAP !!
Wednesday, January 27, 2016 by Minhye

chemistry
A graduated cylinder was used to measure out 5.3 mL of a sample of a liquid into a pre-weighed 100-mL beaker (mass of the beaker = 24.568 g) at 25oC. The total mass of the beaker and alcohol was 29.568 g. what is the actual volume transferred from the graduated cylinder to the...
Wednesday, January 27, 2016 by clememnce

Chemistry
Calculate the mass percent of water in the hydrate Al2(SO4)3·18H2O to four sig. figs. I got this answer 60.23, but I just am confused on how to correctly write the units
Wednesday, January 27, 2016 by Anonymous

chemistry
Describe the circumstances in which the following processes could be used to separate the components of a mixture. -sublimation -crystallization -evaporation of a solvent from a solution -dissolving of an impure substance in a solvent
Wednesday, January 27, 2016 by cara

Chemistry
Culd i get a reference to the formulae used in Solid State ?? (Like the no.of atoms in a face centred cubic cell is 4 Etc )
Wednesday, January 27, 2016 by Minhye

Chemistry
Which of the following has the lowest conductivity when dissolved ? F2, H2O, MgO, or LiCl
Wednesday, January 27, 2016 by Anonymous

Chemistry
How much oxygen is needed to form 50 grams of water?
Wednesday, January 27, 2016 by Majaliwa

Chemistry 102
Using your average value for Kc (6.92x10^2) and the concentrations provided for the reactants (0.00111mol/L for both), determine the absorbance expected when a 16.00mL of Fe3+ is reacted with 10.00ml of SCN and measured in a 1.00cm cuvette.
Wednesday, January 27, 2016 by Taylor

Chemistry
Assuming that the Bohr model is valid, what is the kinetic energy of a photoelectron liberated by a photon with a the given wavelength from a state with given Z and n? If the available energy is insufficient to break the tether, enter 0. λ=320 nanometers from a state with...
Wednesday, January 27, 2016 by Kaitlyn

Chemistry
If each balloon is filled with carbon dioxide gas at 20 degrees C and 1 atmosphere, calculate the mass and the number of moles of carbon dioxide in each balloon at maximum inflation. Use the ideal gas law in your calculation. The volume of the balloon at maximum inflation is ...
Wednesday, January 27, 2016 by Cindy Avalos

Chemistry
If each balloon is filled with carbon dioxide gas at 20 degrees C and 1 atmosphere, calculate the mass and the number of moles of carbon dioxide in each balloon at maximum inflation. Use the ideal gas law in your calculation. Someone please let me know the answer! Thank you so...
Wednesday, January 27, 2016 by Cindy Avalos

Chemistry
I have been plagued by this question for a good half an hour, whilst doing past papers I came across it- ' EXPLAIN why the value of Kw increases as the temperature increases' as far as I can tell, it is about the excess production of OH- and H+ from le chateliers ...
Wednesday, January 27, 2016 by A

Chemistry 101
A chemist needs 2.00 grams of a liquid compound with a density of 0.785 g/cm^3 density. what volume of compund is required?
Wednesday, January 27, 2016 by Lilly

Chemistry
how do you make 400 ml pf 2 Osm solution of Mg CL2?
Wednesday, January 27, 2016 by dee

Chemistry 101
if an organic liquid has a density of 1.11 g/mL and has a measured volume of 500. mL, what mass of liquid is present?
Wednesday, January 27, 2016 by Lilly

Chemistry 101
A chemist needs 2.00 grams of a liquid compound with a density of 0.785 g/cm^3 density. what volume of compund is required? Mass= Volume X Density 2.00g x 0.785 g/Cm^3 = 1.57g/cm^3 Not sure is this is correct......
Wednesday, January 27, 2016 by Lilly

Chemistry
aCETYLENE REACTS WITH OXYGEN GAS TO PRODUCE CARBON DIOXIDE GAS AND WATER VAPOR
Wednesday, January 27, 2016 by Brandon

chemistry
if 100g of calcium carbonate on heating produces 44g of carbon dioxide,how much calcium oxide will be formed?
Wednesday, January 27, 2016 by suja

Chemistry
[10:58am]: Wn 4.5g of liquid water was formed by burning hydrogen gas in oxygen,-72kj of heat was given off.calc d standad heat formation of water
Wednesday, January 27, 2016 by Hayur

Chemistry
You have 10.5 moles of C5H12, how many moles of C do you have?
Wednesday, January 27, 2016 by cici

Chemistry
If each balloon is filled with carbon dioxide gas at 20 degrees C and 1 atmosphere, calculate the mass and the number of moles of carbon dioxide in each balloon at maximum inflation. Use the ideal gas law in your calculation. Someone please let me know the answer! Thank you so...
Wednesday, January 27, 2016 by Cindy Avalos

Chemistry
Combusting 44.8L of H2 with 22.4 L O2 (both at STP) results in the formation of 44.8 L of H2O if the reaction is maintained at the same conditions (STP) and goes to completion. Given the heat of formation of water (= -241.8 kK/mol) calculate a) the PV work b) the heat evolved ...
Tuesday, January 26, 2016 by Sanaya

Chemistry
How many moles of oxygen will be produced by 0.27 moles of potassium chlorate? 2 KCLO3 = 3 O2 + 2 KCL 0.27 x 3 O2 / 2KCL = 0.405?
Tuesday, January 26, 2016 by Boberto

Chemistry
The normal hormone adrenaline concentration (C9H13NO3) in blood plasma and 6,0x10^-8g / L. How adrenaline molecules are contained in 0.5L of plasma sanguine?
Tuesday, January 26, 2016 by Nadia

Chemistry
Write the equation for the dissolution of NH4NO3 in water. If 4.98 mol of NH4NO3 are dissolved, how many total moles of ions are produced?
Tuesday, January 26, 2016 by Hannah

Chemistry
Balance the equations for oxide reduction method: KMnO4 + KCl ---> MnCl2 + Cl2
Tuesday, January 26, 2016 by Julia

Chemistry
Consider that: the tetravalent cation of an isotope has 78 electrons and 128 neutrons; Nuclear relative mass of the same cation is 1.44% higher than the relative nuclear mass of its most common isotope based on these data, calculate the number of neutrons isotope
Tuesday, January 26, 2016 by William

Chemistry
Determine the number of grams present in 3.11x 10^23 atoms of water
Tuesday, January 26, 2016 by Carlton New England

Chemistry
What is the percentage of gas (C2H2) formed when 2.66g of calcium carbide (CaC2) reacts completely with 50g water?
Tuesday, January 26, 2016 by Bill

Chemistry
What mass of calcium carbonate reaction with hydrochloric acid yields 44L of the gas at 27 ° C and 1520 mm Hg?
Tuesday, January 26, 2016 by Nadia

Chemistry
Consider that: the tetravalent cation of an isotope has 78 electrons and 128 neutrons; Nuclear relative mass of the same cation is 1.44% higher than the relative nuclear mass of its most common isotope based on these data, calculate the number of neutrons isotope.
Tuesday, January 26, 2016 by William

Chemistry
How does the molecular wight of the gas affect the k-value?
Tuesday, January 26, 2016 by Alice

Chemistry
What is the pOH of a 0.2M buffer solution of NH 4 + 0.2M NH4NO3 at 25 ° C. PKP = 4.74
Tuesday, January 26, 2016 by Nayara

chemistry
An oxygen gas with a volume of 50 mL at a pressure of 1.5 atm . This gas is compressed up to 35 mL volume at constant temperature . Determine the final gas pressure
Tuesday, January 26, 2016 by bruge

chemistry
A gas at a temperature of 600C and 1ATM has a volume of 120 L. So what is the volume of the gas at a temperature of 400C at a constant pressure ?
Tuesday, January 26, 2016 by bruge

Chemistry
Examples of Molecules having Chiral Centres but having Achiral Structures.
Tuesday, January 26, 2016 by Minhye

Chemistry
How could I tell if an element is stable or unstable? One of the examples is 89/42 Mo The only rule I know entirely is that if the atomic number is greater then 83 then it is unstable. Thanks
Monday, January 25, 2016 by Ana

Chemistry
A car travels at 28 miles per gallon. How many kilometers will it travel per liter of gasoline?
Monday, January 25, 2016 by Micheal

Chemistry
In which of the examples is there an error in either the name OR the formula? silver(I) nitrate -AgNO3 correct iron(III) oxide - Fe2O3 correct sodium bicarbonate - Na2HCO3 - incorrect. calcium phosphate - CaPO3 in correct. rubidium phosphate - Rb3PO4 correct. strontium sulfide...
Monday, January 25, 2016 by Boberto

chemistry
If you began with 24 moles of Fe2O3, approximately how many moles of pure iron would be formed as a product?
Monday, January 25, 2016 by Boberto

Chemistry
How many grams of CO2 (Mm = 44.0 g/mol) are produced in the combustion of 31.0 g of C4H10 (Mm = 58.1 g/mol)?
Monday, January 25, 2016 by Kaitlyn

chemistry
7.20 moles of C3H8 are burned in a room with excess oxygen gas. How many moles of carbon dioxide are released into the atmosphere during this process ?
Monday, January 25, 2016 by Boberto

Chemistry
A compound on analysis as 87:8% c,12:2%h determine its empirical formular&molecular formular given mass=56gmol
Monday, January 25, 2016 by Samuel

chemistry
a 15g sample of gold-198 decays in 3g in 6 days. how much will be left after 8 days?
Monday, January 25, 2016 by chief

Chemistry
Digoxin 150 mcg is ordered IVP every a.m. The vial contains 0.5 mg in 2 mL. How many mL will you give?
Monday, January 25, 2016 by Nayara

chemistry
A gas at a temperature of 600C and 1ATM has a volume of 120 L. So what is the volume of the gas at a temperature of 400C at a constant pressure ?
Monday, January 25, 2016 by bruge

chemistry
An oxygen gas with a volume of 50 mL at a pressure of 1.5 atm . This gas is compressed up to 35 mL volume at constant temperature . Determine the final gas pressure .
Monday, January 25, 2016 by bruge

chemistry
Sulfur dioxide ( SO2 ) is a gas that causes acid rain . At the disposal of the fumes found 24 L found in the SO2 gas pressure of 200 torr . If the pressure is changed to 500 torr at a constant temperature , what is the volume of SO2 gas now ?
Monday, January 25, 2016 by bruge

chemistry
Sulfur dioxide ( SO2 ) is a gas that causes acid rain . At the disposal of the fumes found 24 L found in the SO2 gas pressure of 200 torr . If the pressure is changed to 500 torr at a constant temperature , the volume of SO2 gas berapakan now ?
Monday, January 25, 2016 by bruge

chemistry
How much energy is absorbed to change 7.25 g of ice at -3 C to 25.5C?
Monday, January 25, 2016 by chris

Chemistry
In the complete combustion of C3H8 (propane), how many liters of CO2 are produced from 10 liters of O2?
Monday, January 25, 2016 by Ellie

Chemistry 101
A sample containing 0.0750 pounds of metal pellets is poured into a graduated cylinder initially containing 22.4 mL of water. The water level rises to 31.3 mL. calculated the density of the metal.
Monday, January 25, 2016 by Lilly

Chemistry 101
Convert 115 miles to feet, inches, centimeters, millimeter, and kilometers. Show set-ups.
Monday, January 25, 2016 by Lilly

Chemistry 101
A rectangular prism measuring 12.5 in by 1.134 ft by 11.7 cm has a density of 7.89 g/cm^3. How much does the object weight in grams, kilograms, and pounds?
Monday, January 25, 2016 by Lilly

Chemistry 101
A spherical ball has a diameter of 1.00 inch and a mass of 2.00grams. Will the ball float or sink in water? Remember that if the balls's density is greater than 1.00 g?mL (the density of water), the ball will sink.
Monday, January 25, 2016 by Lilly

Chemistry 101
A student using a 100mL graduated cylinder that contained 50.00mL of water. Th volume of the water increased to 57.50mL. The density of the object was 7.85 g/cm^2. How many grams did the metal object weigh?
Monday, January 25, 2016 by Lilly

Mathematics,Science(physics,chemistry and biology)
Two similarly charged identical ping pong balls are suspended from the common support with the help of two threads.Calculate angle between the two threads and also calculate the tension in two strings.
Monday, January 25, 2016 by Shhd

chemistry
A tank volume of 40 liters containing 2.5 kg of oxygen gas at a pressure of 10 atm . How much air should be included in the tank so that the pressure to 15 atm ?
Monday, January 25, 2016 by bruge

chemistry
complete and balance chemical equation for each of the foll A CH3_CHOH_CH3 --H2SO4--> B CH3_CHBr_CH3+koH-->
Monday, January 25, 2016 by rebu

chemistry
complete and balance chemical equation for each of the foll A CH3_CHOH_CH3 --H2SO4--> B CH3_CHBr_CH3+koH-->
Monday, January 25, 2016 by rebu

chemistry
complete each of the following and name the product a CH3CH2CH=CH2+HCl gives b CH3CH2CH=CH2+Br2 gives c CH3CH2CH=CH2+H2o-H+gives d CH3CH2CH=CH2 alkalin and kMno4 gives as
Monday, January 25, 2016 by beku

chemistry
A gas has a mass compostion of 20.8% nitrogen, 25.8% oxygen, 28.4% carbon dioxide and 25 % hydrogen. Determine its average molecular weight.
Monday, January 25, 2016 by sami

Chemistry
I am stuck on b)... Reacting 1 L of H2(g) with 1 L C2H2(g) (both at STP) results in the formation of 1 L of C2H4(g) if the reaction is maintained at the same conditions (STP) and goes to completion. If this reaction produced 6.3 kJ of heat (absorbed by the surroundings), ...
Monday, January 25, 2016 by Sanaya

chemistry
In a tank volume of 50 liters of gas contained oxygen at a temperature of 57º C and a pressure of 75 atm . What is the mass of the gas ?
Sunday, January 24, 2016 by bruge

Chemistry
If you mix 50.0 mL of a 0.500 M solution of calcium nitrate with 150. mL of a 0.250 M solution of potassium nitrate, what would be the resulting molarity of nitrate ions in the final mixed solution ?
Sunday, January 24, 2016 by colin

chemistry
why is there no pop of pure oxygen and pure hydrogen?
Sunday, January 24, 2016 by alex

Chemistry
How do I convert Mol/L to Mol/mL?
Sunday, January 24, 2016 by Nayara

chemistry
what mass of lead (ii) trioxonitrate (v)will be required to yield, 22g of lead, (ii)chloride on the addition of excess potassium chloride solution
Sunday, January 24, 2016 by favour

chemistry
A certain volume of a gas at 298k is heated such that its volume and pressure are now four times their original value.what is the new temperature
Sunday, January 24, 2016 by Adams j

chemistry
A certain volume of a gas at 298k is heated such that its volume and pressure are now four times their original value.what is the new temperature?
Sunday, January 24, 2016 by Adams

Chemistry
2mole of CH3OOH and 1mole of ethanol were mixed in 1dm3 flask until an equillibrium was established.if the equillibrium constant for the reaction is 4.what is the amount of ethanoate in the equillibrium mixture?
Sunday, January 24, 2016 by Magaji

math
In a class of 50 student 28,22,20 of them offer physics,chemistry and biology respectively also,4 of them offer physics and chemistry but not biology,3 offer physic and biology but not chemistry,6 offer biology and chemistry but not physics if 13 of them offer physics only how...
Sunday, January 24, 2016 by dapo

  1. Pages:
  2. <<Prev
  3. 1
  4. 2
  5. 3
  6. 4
  7. 5
  8. 6
  9. 7
  10. 8
  11. 9
  12. 10
  13. 11
  14. 12
  15. 13
  16. 14
  17. 15
  18. Next>>

Homework Help: Science