Wednesday
February 10, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
How much hydrogen gas (mL) would be rpoduced at 25 degreez C and 1.34 atm if 5.5 grams of zinc reacts with 25mL of 0.05 M hydgrchloric acid? Please respond with how u found the answer
Saturday, May 25, 2013 by mb

chemistry
how much heat would be required to warm the earth's oceans by 1 degree celcius if the volume of the earths oceans is 137x100000000km3 and the density of the seawater is 1.03g/cm3
Saturday, May 25, 2013 by Kay

Chemistry
what is the molarity of 28.9 g of cacl2 dissolved in water to make 0.78 l of solution
Saturday, May 25, 2013 by Fred

Chemistry
If 10g of NO react with 20g of O2, what is the maximum amount of NO2 that can be produced? My answer is Mol NO = 10/30 = 0.333 mols Mol O2 = 20/32 = 0.625 mols To react all the O2 you would need 2 NO*0.625 moles of NO/1mole O2 =1.25 O2? but, we just have 0.333 mols, so NO is ...
Saturday, May 25, 2013 by Timofey

Chemistry
If 1.20g of steam at 100.0 celcius condenses into 38.5 g of water, initially at 27 celcius what is final temperature of water
Saturday, May 25, 2013 by Rich

Chemistry
A solution contains 40.0 g of sodium chloride and 200.0 g of water. Calculate the NaCl concentration as a a) mass percentage, b) molality, c) mole fraction. I have trouble finding mole fraction. I believe I've got the other two, but I'm not 100% sure.
Friday, May 24, 2013 by Mike

Chemistry
Calculate the osmotic pressure at 22 °C of a 0.25 M solution of a) dextrose, b) magnesium chloride.
Friday, May 24, 2013 by Mike

Chemistry
Describe the subatomic structure of the nucleus, including the structure of each nucleon. Draw a picture. Describe the forces that hold the nucleus together and draw them on your diagram. Explain how beta emission works.
Friday, May 24, 2013 by Paige

Chemistry
Compare and contrast the processes of nuclear fission and fusion, showing similarities and differences. Describe which, if any, of these processes is naturally occurring. If so, where?
Friday, May 24, 2013 by Joanna

Chemistry
Estimate the number of moles of gas (and mass of gas assuming that it is all N2) inside your family car (or a friends if you don't have one). If the amount of gas was compressed at constant temperature to fit inside a coke can what would the pressure inside the coke can be...
Friday, May 24, 2013 by Timoefy

Chemistry
How many grams would you need to weigh out in order to have 2.7 x 1021 formula units of LiCl? i am so confused :(
Friday, May 24, 2013 by Yasmen

Chemistry
Calculate the volume occupied by 200g of steam at 200 °C and 0.5 atm. is my answer correct: PV = nRT V = nRT/P V = gRT/mm P V = (200g H2O)(0.0821 liters atm/1mole K)(473 K)/ (18g H2O/1mole )(0.5 liters atm) = 863 liters
Friday, May 24, 2013 by Timofey

Chemistry -- DrBob222
A gas initially at STP is heated to 50°C keeping the volume constant. What is its new pressure? I used this formula: P1 = 1 atm T1 = 273 K T2 = 323 K solve for P2 P2 = P1 (T2/T1) But, where do I use the 50 degrees C? Also, is my answer correct: P2 = 1atm x 323K/273K = 1.18...
Friday, May 24, 2013 by Timofey

Chemistry
A .25 g chunk of sodium metal is cautiously dropped into a mixture of 50g of water and 50 g of ice both at 0 C 2Na(s) + 2h2o(l) -> 2naoh(aq) + H2 Delta H = -368 kj Will the ice melt ..
Friday, May 24, 2013 by Diep

chemistry
Oxygen vapor combines with hydrogen gas to produce liquid water. If 50.0 g of oxygen combines with 105 L of Hydrogen gas (at STP) how many grams of water could be produced?
Thursday, May 23, 2013 by Mary

Chemistry
How many liters of oxygen are required to react completely with 5.9 L c3H8?
Thursday, May 23, 2013 by Mary

Chemistry
Determine the mass of 100mL of vinegar if the density of vinegar is 1.09 g/mol
Thursday, May 23, 2013 by Nicole

chemistry
What is the balanced equation for a reaction of iron with chlorine?
Thursday, May 23, 2013 by Beth

chemistry
What volume (in liters) of 0.94 M KOH solution should be added to a 0.090 L solution containing 9.1 g of glutamic acid hydrochloride (Glu, FW=183.59; pka1=2.23, pka2=4.42, pka3=9.95) to get to pH 10.20?
Thursday, May 23, 2013 by Decisice 2

chemistry
Ignoring activities, determine the molar solubility (S) of Zn(CN)2 in a solution with a pH = 3.63. Ksp (Zn(CN)2) = 3.0 × 10-16; Ka (HCN) = 6.2 × 10-10. I'm completely lost help please!
Thursday, May 23, 2013 by Linda

Chemistry
Would the VSEPR notation of CH3Cl be AX4?
Thursday, May 23, 2013 by May

chemistry
in fcc crystal system with unit cell of an edge 200pm calculate its density if 200grams of this element contains 24*10E23
Thursday, May 23, 2013 by ananya

Chemistry
40.0 g of magnesium chloride (MgCl2) in 250.0 g of water at 22 °C.Calculate a) the vapor pressure of this solution, b) the freezing point, c) the boiling point. I know it is something like this, but I continue to get the incorrect answer. A) 40.og Mgcl2*(1mol mgcl2/ 95.2 ...
Thursday, May 23, 2013 by Jasmine

chemistry project please help really need it
help me out in choosing a topic for my project it should be anyhow related to chemistry help me please
Thursday, May 23, 2013 by aditi

Chemistry
What happens if you add more solute to a saturated solution?
Wednesday, May 22, 2013 by Timofey

chemistry
If you add a metal piece to excess acid, what of listed factors below will increase, decrease, or have no impact on how fast a reaction happens? a) lower molarity (concentration) of a solution b) higher molarity (concentration)of a solution c) increase volume of a solution (...
Wednesday, May 22, 2013 by K

Chemistry
If 10g of NO react with 20g of O2, what is the maximum amount of NO2 that can be produced? How do I know exactly which is limiting and which is excess, is there a calculation that shows this?
Wednesday, May 22, 2013 by Timofey

Chemistry
What is the intermolecular force for BaCO3?
Wednesday, May 22, 2013 by Katie

Chemistry
The volume of a gas sample is 200 L at 740 torr. What is its volume at 760 torr?
Wednesday, May 22, 2013 by Terry

Chemistry
What is the mass of a sample of acetylene gas (C2H2)that contains 4.44 x 1034 atoms of carbon? Also, Im not sure how to convert from moles of C to moles of C2H2.
Wednesday, May 22, 2013 by Timofey

Chemistry
The volume of a gas sample is 200 L at 740 torr. What is its volume at 760 torr?
Wednesday, May 22, 2013 by Terry

chemistry
(a)how much energy in KJ/mol is released when an electron makes a transition from n=5 to n=2 in a hydrogen atom?
Wednesday, May 22, 2013 by hardi

chemistry
sodium vapor lamps, used for public lighting, emit 489nm yellow light. what energy is emitted by: (a) an excited sodium atom when it generates a photon? (b) 1 mol of excited sodium atoms at this wavelength?
Wednesday, May 22, 2013 by hardi

Chemistry
Write a procedure to demonstrate the effect of higher concentrations of HCl on its rate of reaction with antacid tablets. I have HCl with a concentration of 1.0 mol/L. This is what I have so far. Are my concentrations correct for this procedure? E is my control and, a,b,c,d ...
Wednesday, May 22, 2013 by Carolyn

Chemistry
What is the normality of a solution which contains 4.03-g of sodium carbonate in 300.-mL of solution?
Wednesday, May 22, 2013 by Megan

Chemistry
what volume of oxygen is needed to react with solid sulfur to form 6.20 L of sulfur dioxide according to the reaction S(s) + O2(g) yield SO2(g)
Wednesday, May 22, 2013 by Anonymous

chemistry
A solute is added to water and a portion of the solute remains un-dissolved. When equilibrium between the dissolved and un-dissolved solute is reached, the solution must be
Wednesday, May 22, 2013 by berta

Chemistry
Do alloys have the same properties as their individual elements?
Wednesday, May 22, 2013 by herp_derp

Chemistry
Say you have a question asking to rank the oxidizing strength of several different metals. When you look at the reduction table to determine the strength, there are metals with different oxidation states. For example: Fe3+ + 3e- => Fe ; Eo = -.04 Fe2+ + 2e- => Fe ; Eo...
Tuesday, May 21, 2013 by jamie

Chemistry
Does NaHCO3 form an acidic aqueous solution?
Tuesday, May 21, 2013 by Anonymous

chemistry
explain why a balloon with 1.00 mol xe gas in it has the same volume as balloon with 1.00 mol he gas in it
Tuesday, May 21, 2013 by joe

Chemistry
Do the properties of a newly formed chemical compound tend to differ from or be the same as the properties of the individual elements that compose it?
Tuesday, May 21, 2013 by John

chemistry
calculate the number of milliliters of 0.10 M cupric sulfate solution that must be diluted to prepare 10mL of a 0.015M cupric sulfate solution.
Tuesday, May 21, 2013 by Atticus

Chemistry
Calculate the grammes of oxygen which would involved on heating 5g of potassium trioxochlorate(v)
Tuesday, May 21, 2013 by Nkpume

Chemistry
Calculate the grammes of oxygen which would involved on heating 5g of potassium trioxochlorate(v)
Tuesday, May 21, 2013 by Nkpume

Chemistry
How many grams of fluorine are required to react with 100g of NaBr in the following reaction: F2 + 2NaBr --> 2NaF + Br2 Also, does this show 1 F2 molecule or 2 F2 molecules and how will i write it with the conversion factors with units?
Tuesday, May 21, 2013 by Timofey

Easy Chemistry
is 2 molecules of fluorine the same as 2 fluorine molecules? if so then how/why
Tuesday, May 21, 2013 by Timofey

chemistry
CH3BR+_->_+C2H6
Tuesday, May 21, 2013 by afifa

Chemistry
Water boiled contained 16. 2g of calcium hydrogen carbonate.Calculate the mass of CaCO3 formed?
Tuesday, May 21, 2013 by Ruth mwelepete

chemistry
how many moles of nh3 are produced from 16 grams of n2 ?
Tuesday, May 21, 2013 by jojo

chemistry
Explain how dispersion forces, dipole-dipole forces, and hydrogen bonds (intermolecular forces) affect the 2 states of matter using phase changes and heating curves. What is the effect on vapor pressure with dispersion forces, dipole-dipole forces, and hydrogen bonds?
Monday, May 20, 2013 by K

CHEMISTRY
1.List all the ions that cause a red flame and produce a precipitate in the presence of hydroxide ions. 2.List all the cations that could cause the red flame and produce a precipitate in the presence of sulfate ions. 3.
Monday, May 20, 2013 by NEED help PLEEASE!!

Chemistry
If 50 mL of a saturated solution of KClO3 at 55¡ÆC is cooled to 15¡ÆC, calculate the mass of precipitate that will form
Monday, May 20, 2013 by LOL

chemistry
When a 4.00-g sample of KCN is dissolved in water in a calorimeter that has a total heat capacity of 1.797 kJ·K–1, the temperature decreases by 0.400 K. Calculate the molar heat of solution of KCN.
Monday, May 20, 2013 by kitor

Chemistry
Oxygen gas and hydrogen gas are used to synthesize dihydrogen monoxide. A lab group utilizes 1.00 liters of oxygen and 1.01 liters of hydrogen to create 0.75 grams of product. How many milliliters of product should the group have expected to get? What will the [H+] ...
Monday, May 20, 2013 by Nick

inorganic chemistry
silt is an example of ........ Hydride
Monday, May 20, 2013 by isaac

Chemistry
Is electroplating an industrial electrochemical process? What would be an industrial electrochemical process?? electric generator or electrolysis?
Monday, May 20, 2013 by scilover

Chemistry
Oxygen gas and hydrogen gas are used to synthesize dihydrogen monoxide. A lab group utilizes 1.00 liters of oxygen and 1.01 liters of hydrogen to create 0.75 grams of product. How many milliliters of product should the group have expected to get? What will the [H+] ...
Monday, May 20, 2013 by Adam

chemistry
When 3.54 g of a nonelectrolyte solute is dissolved in 675 mL of water at 24 °C, the resulting solution exerts an osmotic pressure of 913 torr.
Monday, May 20, 2013 by kitor

Chemistry
If a 0.1 mol/L solution is diluted to 0.01 mol/L, the: a) concentration of hydrogen ions increases b) pH decreases c) acidity constant decreases d) the acidity constant does not change I would think the ph decreases? no?
Monday, May 20, 2013 by scilover

Chemistry
In order to completely neutralize 0.985 mol of sodium hydroxide, 43.2 mL of an acid is required. The concentration of the acid is: a) 2.3 M b) 22.8 M c) 31.0 M d) 48.2 M Is it b?
Monday, May 20, 2013 by scilover

chemistry
How many grams of carbon dioxide will form if 4.4 g of propane reacts with 16.0 g of oxygen producing 7.2 g of water?
Monday, May 20, 2013 by Ron

Chemistry
how many ml of .5M HCL are required to neutralize 600 mg of Mg(OH)2?
Monday, May 20, 2013 by Aron

Chemistry
In the system A(g) + 2B(g)  2C(g) + 2D(g) H=21 kJ/mol, it is possible to increase the quantity of C by: a) adding a catalyst b) decreasing the [B] c) increasing the pressure d) increasing the temperature - I think it is b ? Am i right?
Monday, May 20, 2013 by scilover

chemistry
What is the hydrogen ion concentration, in mol dm−3, when 2.00 g of sulfuric acid is dissolved in water to give 0.400 dm3 of solution? could you explain in a simple and clear way please because im not very good at chemistry. thanks in advance
Sunday, May 19, 2013 by becky

Chemistry
A mixture of lead, magnesium, nitrate and chromate ions are present in a solution. What will the precipitate be? a) MgPb b) Pb(NO3)2 c) PbCrO4 d) MgCO3 I think its d)- am i right?
Sunday, May 19, 2013 by scilover

Chemistry
What happens if sodium acetate (CH3COONa) is added to the following reaction? CH3COOH  H+ + CH3COO- a) [H+] increases b) [H+] decreases c) a precipitate is formed d) [H+] does not change
Sunday, May 19, 2013 by scilover

chemistry
A certain weak base has a Kb of 7.80 × 10-7. What concentration of this base will produce a pH of 10.17?
Sunday, May 19, 2013 by Lana

chemistry
Write the half reaction and balanced equation for: Cl2(g) + H2(g) -> HCl(aq) so I got: 2e- + Cl2(g) -> 2Cl- H2(g) -> 2H+ + 2e- so Hydrogen is oxidized and Chlorine is reduced so for cell notation I put: Pt(s)|H2(g)|H+(aq)||Cl2(g)|Cl-(aq)|Pt(s)​ but the answer in...
Sunday, May 19, 2013 by Hugh

Chemistry
In the following unbalanced reaction, which atom is oxidized? HNO3 + HBr -> NO + Br2 + H2O Is the answer bromine?
Sunday, May 19, 2013 by Anonymous

chemistry
How many liters of 0.50M NaOH must be added to 125 mL of 0.75M HCL to neutralize it
Sunday, May 19, 2013 by KJ

Chemistry
NOCL(g) decomposes to from nitrogen monoxide gas and chlorine gas. The equation is 2NOCL ----> 2NO +Cl2 At a certain temperature the equilibrium constant is 1.60 x 10^-6. Calculate the equilibrium concentrations of all gases if 0.800 moles of NOCL are placed in a 2.00 L ...
Sunday, May 19, 2013 by Maeve

Chemistry
How many oxygen atoms are in a) 3.21 x 10^22 molecules CH3OH b) .250 mol C6H12O6 Is it a) 3.21 x 10^22 atoms b) 9.03 x 10^23 atoms
Sunday, May 19, 2013 by K

Chemistry
Suppose we are dealing with calcium chloride as opposed to the chemical in the video. If a solution contains 70 g of calcium chloride per 100 g of water at 25 degrees Celsius, is the solution unsaturated, saturated, or supersaturated?
Sunday, May 19, 2013 by Moise

Chemistry
A bracelet containing .200 mol of metal atoms is 75% gold. How many particles of gold atoms are in the bracelet?
Sunday, May 19, 2013 by K

Chemistry
What are the Oxidation and Reducation reactions for these equations : BaCl2 + NaHCO3 -> BaCO3 + NaCl + HCl (carbon is the reduction reaction, but I don't know what the oxidation reaction is) CaCO3 + HCl -> CaCl2 + CO2 + H2O
Sunday, May 19, 2013 by K

Chemistry
Find the polar coordinate of the following. (0,-6) I know r = sq.root of 6 but tan theta = -6/0 doesn't exist so how will I find the degree? Thanks
Sunday, May 19, 2013 by Shadow

chemistry
Complete the mass balance expression for a saturated solution of Ag2CO3. Note at least one blank is a numeric coefficient. (Note: Ignore any subsequent reactions of Ag .)
Sunday, May 19, 2013 by Lana

chemistry
hydrogen gas can be produced by reacting aluminum with sulfuric acid .How many L hydrogen gas are produced by reacting 15.0 mol of sulfuric acid with 15.0 mol of aluminum at STP?
Sunday, May 19, 2013 by may

chemistry
What is the primary standard for the preparation of silver.
Sunday, May 19, 2013 by Ade otunba naim

chemistry
What is the primary standard for the preparation of silver.
Sunday, May 19, 2013 by Ade otunba naim

chemistry
What is the primary standard for the preparation of silver.
Sunday, May 19, 2013 by Ade otunba naim

chemistry
What is the primary standard for the preparation of silver.
Sunday, May 19, 2013 by Ade otunba naim

chemistry
Describe the preparation of 2litre of 0.05molar silver from the primary standard grade solid.
Sunday, May 19, 2013 by Ade otunba naim

Chemistry
How many grams of phosgenite can be obtained from 10.0 g of PbO and 10.0 g of NaCl in the presence of excess water and carbon dioxide
Saturday, May 18, 2013 by heather-please help due by midnight!!!

Chemistry
what is the total molar concentration of all the ions in .040 M solutions of the following salts in water? .040 M KCL .040 M CuSO4 .040 M CaCl2
Saturday, May 18, 2013 by Kelly-Please help!!

Chemistry
How many grams of phosgenite can be obtained from 10.0 g of PbO and 10.0 g of NaCl in the presence of excess water and carbon dioxide
Saturday, May 18, 2013 by Kelly

Chemistry
a .6800g sample of carboxylic acid is burned in oxygen, producing 1.212 g of CO2 and .4991 g of H2O. determine the empirical formula of the carboxylic acid
Saturday, May 18, 2013 by Kelly

Chemistry
A 12% solution is diluted 1:60. What is the volume and concentration of the final solution? I started off with this 12(1/60) = 0.2% However, how do I get the final volume and concentration? Thanks
Saturday, May 18, 2013 by freelance

Chemistry
A solution of NaCl and glucose gives a freezing point of -0.95°C. It contains 140 mOsmol glucose/L. Give concentration of NaCl in milliosmoles per liter and molarity. Thanks
Saturday, May 18, 2013 by freelance

chemistry
how many liters of oxygen are necessary for the combustion of 340 g of ethanol (c2h5OH) assuming the raction occurs at STP? no idea how to work this out
Saturday, May 18, 2013 by parker

Chemistry
the reaction of 6.62g of carbon with excess oxygen yields 13.40g of CO2. what is the percent yield of this reaction
Saturday, May 18, 2013 by Kelly

M.m.m.campus (chemistry)
Laboratory preparation of carbon dioxide?
Saturday, May 18, 2013 by Lalan patel

Chemistry
how many outer shell electrons does a carbon atom have using periodic table?
Saturday, May 18, 2013 by Timofey

Chemistry
In basic solution disproportionate to bromited bromide ions. Use the half reaction method to balance the equation.
Saturday, May 18, 2013 by Praise

chemistry
which orbitals have centre of symmetry
Saturday, May 18, 2013 by kuldeep

chemistry
what is the normality and nature of the mixture obtained by mixing 0.62 gram of na2co3.h2o to 100 ml of 0.1N h2so4
Saturday, May 18, 2013 by aditi

chemistry
will linear polybutadiene or branched polybutadiene have a higher molar volume?
Saturday, May 18, 2013 by himani.

Chemistry
How much 3M H2SO4 can be made from 20ml of 12N H2SO4?
Saturday, May 18, 2013 by freelance

Chemistry
How many grams of CaCl2 are needed to make 100ml of a 15% solution in water if only the dihydrated (CaCl2 •2H20) salt is available?
Friday, May 17, 2013 by student123

  1. Pages:
  2. <<Prev
  3. 123
  4. 124
  5. 125
  6. 126
  7. 127
  8. 128
  9. 129
  10. 130
  11. 131
  12. 132
  13. 133
  14. 134
  15. 135
  16. 136
  17. 137
  18. Next>>

Homework Help: Science