Friday
October 31, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry
If 56 mL of 1.93 M hydrochloric acid is mixed with water to create a solution with a concentration of 0.9 M , how many liters of water were added?
Saturday, May 31, 2014 at 7:18pm

Chemistry
Fish breathe the dissolved air in water through their gills. Assuming the partial pressures of oxygen and nitrogen in the air are to be .20 atm and .80 atm respectively, calculate the mole fractions of oxygen and nitrogen in the air dissolved in water at 298 k. The ...
Saturday, May 31, 2014 at 6:50pm

Chemistry
Chemistry and engineering topics how chemistry relates to engineering for my 10 page research paper
Saturday, May 31, 2014 at 6:00pm

Chemistry
How many moles of KF are contained in 244 mL of 0.135 m KF solution? The density of the solution is 1.22 g/mL.
Saturday, May 31, 2014 at 5:16pm

Chemistry
At 20°C, an aqueous solution that is 18.0% by mass in ammonium chloride has a density of 1.0512 g/mL What is the molarity of ammonium chloride in the solution?
Saturday, May 31, 2014 at 4:44pm

Chemistry
the solubility of 1-butanol in water is 7.9g per 100g of water. What is the maximum amount of 1-butanol that will dissolve in 5.9g of water
Saturday, May 31, 2014 at 3:57pm

Chemistry
a sulfuric acid solution that is 65.0 h2so4 by mass has a density of 1.55 g/mL. What is the molality of sulfuric acid in this solution
Saturday, May 31, 2014 at 3:18pm

Chemistry
What is the mass percent of an aqueous sodium hydroxide solution in which the molality of NaOH is 6.25m? The density of the solution is 1.2219 g/mL
Saturday, May 31, 2014 at 1:45pm

Chemistry
A sulfuric acid solution that is 65.0% H2SO4 by mass has a density of 1.55 g/mL at 20°C. What is the mass of h2so4 per liter of solution?
Saturday, May 31, 2014 at 1:09pm

chemistry
What volume would the gas occupy if P2 = 0.29 P1? Answer in units of mL
Friday, May 30, 2014 at 8:42pm

chemistry
A gas has a volume of V1 = 565 mL. If the temperature is held constant, what volume would the gas occupy if P2 = 16 P1? Answer in units of mL
Friday, May 30, 2014 at 8:39pm

chemistry
You react 25.0 liters of oxygen gas at STP with 50.0 ml of ethanol liquid. Ethanol has a density of 0.789 g/ml. After actually running the reaction you determined the percent yield was only 78.5%. How many LITERS of CO2 did you make? (Must put CO2 in answer la
Friday, May 30, 2014 at 11:07am

chemistry
A solution of Al2 (SO4) 3 {d=1.253gm/ml } contain 22% salt by weight. The molarity, normality, and molality of the solution is?
Friday, May 30, 2014 at 4:28am

chemistry
you wish to combine two samples, one sample contains is solid water at 0 degree celsius.The other sample contains liquid water at 0 degree celsius,you want to combine both raise the temperature to 100 degree celcius but boil off only 50 ml to gas phase keep the rest as liquid....
Friday, May 30, 2014 at 1:06am

chemistry
you wish to combine two samples, one sample contains is solid water at 0 degree celsius.The other sample contains liquid water at 100 degree celsius,you want to combine both raise the temperature to 100 but boil off only 50 ml to gas phase keep the rest as liquid.How much ...
Friday, May 30, 2014 at 12:51am

chemistry
you wish to combine two samples, one sample contains is solid water at 0 degree celsius.The other sample contains liquid water at 100 degree celsius,you want to combine both raise the temperature to 100 but boil off only 50 ml to gas phase keep the rest as liquid.How much ...
Friday, May 30, 2014 at 12:20am

Chemistry
A sample of hydrogen gas is collected by water displacement at 20.0'C when the atmospheric pressure is 99.8kPa. What is the pressure of the dry hydrogen, if the partial pressure of water vapour is 2.33kPa at that temperature?
Friday, May 30, 2014 at 12:07am

Chemistry
A tank of chlorine gas contains 25.00 kg of pressurized liquid chlorine. If all the chlorine is released in its gaseous for at 17'C and 0.98atm, what volume does it occupy?
Friday, May 30, 2014 at 12:04am

chemistry
you wish to combine two samples, one sample contains is solid water at 0 degree celsius.The other sample contains liquid water at 100 degree celsius,you want to combine both raise the temperature to 100 but boil off only 50 ml to gas phase keep the rest as liquid.How much ...
Thursday, May 29, 2014 at 11:59pm

chemistry
If the mass of copper wire used in your reaction was only 0.012 grams, but the amount of silver nitrate used was unchanged, then how many grams of silver metal could be produced?
Thursday, May 29, 2014 at 7:25pm

Chemistry
Which of the following explains why there are so many differences in the properties of peptides and proteins? A) several amino acid sequences are possible for proteins and peptides B) some proteins are enzymes while others are not C) proteins and peptides include nitrogen D) ...
Thursday, May 29, 2014 at 5:42pm

Chemistry
indium-115 has a half life of 4.5 hours, if you start with a 12.0mg sample of indium-115, how much will remain after 13.5 hours
Thursday, May 29, 2014 at 5:37pm

Chemistry II
How long would it take to consume 13 mg of magnesium in 4.2 mL of 1.25 M HCl? Explain.
Thursday, May 29, 2014 at 5:26pm

Chemistry II
How long would it take to consume 13 mg of magnesium in 4.4 mL of 1.25 M HCl? Explain.
Thursday, May 29, 2014 at 3:56pm

Chemistry
A sample of gas at a pressure of 1.5 atm has a volume of 22.4 L. What is the new volume if the pressure is lowered to 0.75 atm?
Wednesday, May 28, 2014 at 9:35pm

Chemistry
Did I break this up correctly? NaHclO3 breaks into Na+ and HClO3-, and that further breaks into H+ and ClO3-
Wednesday, May 28, 2014 at 9:21pm

chemistry
what will be the pH of a solution NaOH with the concentration 2,2.10mol
Wednesday, May 28, 2014 at 5:56pm

chemistry
NaHclO3 breaks into Na+ and HClO3-, and that further breaks into H+ and ClO3-, is that right?
Wednesday, May 28, 2014 at 5:06pm

chemistry
I say unsaturated. Am I right?
Wednesday, May 28, 2014 at 4:51pm

chemistry
) A chemist dissolves 1.000 x 103 g of potassium hydroxide in enough water to make 1.5 L of stock solution. The chemist later wants 2.00 x 102 mL of 0.10 M potassium hydroxide. How much stock solution does the chemist need in order to make this second solution?
Wednesday, May 28, 2014 at 10:16am

chemistry
CH4+2O2====>2H2O+CO2.calculate the mass of CO2 and H2O formed by combustion of 64g of CH4.
Wednesday, May 28, 2014 at 12:41am

Chemistry
At a temperature of 23.0 degrees celcius, and a pressure of 2.25 bar what volume would 23.0 g of a compound in the gaseous state with a molecular mass of 207 g/mol occupy?
Tuesday, May 27, 2014 at 9:38pm

Chemistry
When magnesium hydrogen carbonate reacts with sulfuric acid, would you consider that an exothermic reaction because it forms CO2 (gas)?
Tuesday, May 27, 2014 at 9:05pm

chemistry
Something that will lower the freezing point of water to -3.7 degrees Celsius if one mole were placed in 1000 grams of water? To solve this I know I have to use the equation Tf= IKfm, Tf= 3.7, but how I go about the problem there if I don't know Kf or the the mole of ...
Tuesday, May 27, 2014 at 8:50pm

chemistry
If 4.8 liters of a 2.8 M solution of NaCl then the solution will have *Blank* moles of NaCl dissolved in it.
Tuesday, May 27, 2014 at 8:27pm

Chemistry
The motor is connected from it's battery and used as a generator.On the axes(vertical is amps and horizontal is time) show the type of current it provides when it is rotated through 2 complete revolutions
Tuesday, May 27, 2014 at 8:17pm

Chemistry
CH3−CH2−CH2−O−CH​2−CH2−CH2−CH2−CH​3 Spell out the full name of the compound
Tuesday, May 27, 2014 at 6:34pm

Chemistry
Complete and balance the following (CH3)2NH(aq)+CH3COOH(aq)→ CH3CH2NH2(aq)+HBr(aq)→ CH3NH2(aq)+HCOOH(aq)→
Tuesday, May 27, 2014 at 6:33pm

Chemistry
I seriously need help. 1) What is the pOH of a strong acid with a pH of 2? 2)What is the molarity of a strong acid equal to?
Tuesday, May 27, 2014 at 5:25pm

Science
Can anyone help me with some topics to write about on what chemistry has to do with mechanical engineering. Anyone's help would be appreciated because I really need to finish this 10 page research paper.
Tuesday, May 27, 2014 at 3:23pm

general chemistry
how to calculate molarity?
Tuesday, May 27, 2014 at 2:41pm

chemistry
Balance the following equation by partial equation method:- P4 + HNO3= H3PO4 + NO2 + H2O
Tuesday, May 27, 2014 at 1:14pm

chemistry
which complementary functional group from dopamine would need to be present in the receptor for the interaction to occur.
Tuesday, May 27, 2014 at 9:39am

chemistry
How much naoh and hno3 is needed to make nano3?
Monday, May 26, 2014 at 10:57pm

Chemistry HELP
you have 12.56 g of a mixture made up of sodium chloride and barium chloride. explain how you could use a precipitation reaction to determine how much of each compound the mixture contains
Monday, May 26, 2014 at 9:24pm

Chemistry
What is the hybrid ization? SP 1,2,3 What is #sigma and #pi? Thank you so much for your help!! 😄
Monday, May 26, 2014 at 8:43pm

Chemistry
Describe in detail how light is produced. (Hint: energy levels) Thank you so much for your help!! 😊
Monday, May 26, 2014 at 8:41pm

Chemistry
Dr bob for this question :Calculate the molar solubility of manganese II hydroxide in ph 12.85 solution. The Ksp is 2.1 x 10^-13 but I can't solve for x thanks.
Monday, May 26, 2014 at 6:47pm

Chemistry
A compound of chlorine and fluorine, ClFn, reacts at about 75oC with uranium metal to produce uranium hexafluoride, UF6 and chlorine monofluoride, ClF (g). A quantity of uranium produced 3.53g UF6 and 343 mL ClF at 75oC and 2.50 atm. What is the formula (n) of the compound?
Monday, May 26, 2014 at 6:37pm

Chemistry
Manganese trifluoride, MnF3,can be prepared by the following reaction. 2 MnI2 (s) + 13 F2 (g) ---> 2 MnF3(s) + 4 IF5(l) What is the minimum number of grams of F2 that must be used to react with 12.0 g of MnI2 if the overall yield of MnF3 is no more than 75% of theory?
Monday, May 26, 2014 at 6:10pm

Chemistry
Calculate the molar solubility of manganese II hydroxide in ph 12.85 solution.
Monday, May 26, 2014 at 5:49pm

Chemistry
What element(s) are more polarizable than oxygen? How can you tell? Wouldn't fluorine be most polarizable, because it is the most electronegative?
Monday, May 26, 2014 at 5:20pm

chemistry
A is a solution of HCL containing 7.30g/dm3.B is a solution ofX2CO3 containing 10.6g/dm3.assume that average volume of acid is 2.81cm3 and the volume of base is 25.00cm3.from your result and information .calculate (I)concentration of A in mol/dm3(ii)concentration of B in mol/...
Monday, May 26, 2014 at 5:15pm

chemistry
Calculate the mass of oxygen (in mg) dissolved in a 5.00 L bucket of water exposed to a pressure of 1.13 atm of air. Assume the mole fraction of oxygen in air to be 0.21 and the Henry's law constant for oxygen in water at this temperature to be 1.3 x 10-3 M/atm.
Monday, May 26, 2014 at 3:45pm

chemistry
identify the type of reaction:- FeSO4 + heat ----------> Fe2O3 + SO2 + SO3
Monday, May 26, 2014 at 6:53am

chemistry
X is a solution,of dibasic of H2X. G is a solution containing 1.00g of NaOH in 250cm3 of solution . 24.60cm3 of solution F required 25.00cm3 of solution G . From your result and information provided above. (I)concentration of G in mol/dm3 (ii) concentration of F in mol/dm3 (...
Sunday, May 25, 2014 at 3:28pm

Organic Chemistry
What ketone or aldehyde would be reduced to produce each alcohol, respectively: a. 3,3-Dimethyl butan-2-ol b. 3-Methyl butan-1-ol c. Benzyl alcohol
Saturday, May 24, 2014 at 11:36pm

chemistry
aspirin, Sodium bicarbonate, and Salicylic acid. From these examples, select one acid, one base, and one salt and describe specifically how and where they are used in therapeutic processes.
Saturday, May 24, 2014 at 8:30pm

chemistry
how many molecules of h2o if formed from this equation Al2O3 + 3H2 ->2Al + 3H2O
Saturday, May 24, 2014 at 5:37pm

CHEMISTRY
given this balance equation, C2H5OH+3O2=3H2O+2CO2 HOW MANY GRAMS OF CO2 ARE PRODUCED FROM 18.5 GRAMS OF OXYGEN GAS?
Saturday, May 24, 2014 at 4:13pm

Calculation in chemistry
8.0g of mettalicoxide were reduced by hydrogen to give a metal of 2.0g. Calculate the mole of d metal that will combined with 0.5moles of oxygen.
Friday, May 23, 2014 at 4:53pm

Chemistry
How many moles of silver will be deposited from a silver(i)trioxonitrate(v)solution by 16g of copper (Ag=108, Cu=64).
Friday, May 23, 2014 at 4:26pm

chemistry
Use the systematic treatment of equilibrium to determine the pH and concentrations of species in 1.00 L of solution containing 0.065 mol citric acid (H3A), 0.025 mol 8-hydroxyquinoline (HB), and 0.040 mol KOH. Consider just acid-base chemistry. Ignore ion pairing and activity ...
Friday, May 23, 2014 at 1:46pm

Chemistry
Determine the final pressure of a gas that has initial pressure of 1.00 atm and is heated from 20.0 C to 30.0 C in a container with a fixed volume.
Friday, May 23, 2014 at 12:35pm

chemistry
What is the monomer and polymer structure of DNA?
Friday, May 23, 2014 at 1:22am

Chemistry
The mechanism for the reaction described by No2+CO--->CO2+NO is suggested to be (1)2NO2--->NO3+NO (2)NO3+CO--->NO2+CO2 Assuming that [NO3] is governed by steady-state conditions, derive the rate law for the production of CO2(g) and enter it in the space below. rate of...
Friday, May 23, 2014 at 12:43am

Chemistry
Balance Redox using reactions by the 1/2 reaction method. NaIO3 (aq) + KI (aq) -->„³ I2 (s)
Thursday, May 22, 2014 at 9:52pm

chemistry
I say unsaturated. Am I right?
Thursday, May 22, 2014 at 9:22pm

chemistry
If 75 g of NaNO3 is dissolved in 100 g of H2O at 10°C, is the solution saturated, unsaturated or supersaturated?
Thursday, May 22, 2014 at 9:20pm

Chemistry
Why would copper (II) sulfate solution react with iron to produce 3 CuSO4(aq) + 2 Fe (s) = 3 Cu (s) + Fe2(SO4)3 (aq)
Thursday, May 22, 2014 at 6:50pm

Chemistry
Can anyone help me with some topics to write about on what chemistry has to do with mechanical engineering. Anyone's help would be appreciated because I really need to finish this 10 page research paper.
Thursday, May 22, 2014 at 4:06pm

Chemistry
Which of the following results from the presence of a solute in a given solvent? A. The vapor pressure of the solution is lower than that of the pure solvent. B. The boiling point of the solution is lower than that of the pure solvent. C. The freezing point of the solution is ...
Thursday, May 22, 2014 at 3:22pm

Chemistry
If the solubility of a gas in water is 1.22 g/L at 2.75 atm, what is its solubility (in g/L) at 1.0 atm? A. 0.44 g/L B. 3.97 g/L C. 2.25 g/L D. 3.36 g/L I think the answer is C.. i did 2.75 x 1.0 = 2.75 / 1.22 = 2.25 but people say the answer is A... why? i think the answer is...
Thursday, May 22, 2014 at 2:22pm

CHEMISTRY
WHICH IS LIMITING REAGENT IN FOLLOEING REACTION 3Mg +N2 =Mg3N2
Thursday, May 22, 2014 at 12:51pm

CHEMISTRY
.4g sample of monobasic acid requires 16cm3 of .1 mol dm 3 of NAOH for complete neutralization what is relative mass of acid
Thursday, May 22, 2014 at 12:36pm

chemistry
balance the charge in the two half reactions by multiplying the half reactions by the correct multiplication factors
Thursday, May 22, 2014 at 11:56am

Chemistry
5C(s)+2SO2(g)->CS2(I)+4CO(g) A-) if you have 6.78 g of C and 7.54 g of SO2, how many grams of CO can be created? B-) what is the limiting reagent from A? C-) how much of the excess reagent is left after reaction? D-) if only 5.89 of CO was actually created, what is the ...
Thursday, May 22, 2014 at 9:04am

Chemistry
Suppose that coal of density 1.5 g/cm3 is pure carbon. (It is, in fact, much more compli- cated, but this is a reasonable first approxima- tion.) The combustion of carbon is described by the equation C(s) + O2(g) −→ CO2(g) ∆H◦ = −394 kJ What is ...
Thursday, May 22, 2014 at 8:01am

Chemistry
The heat of combustion of methane is -890 kj per mole. How much heat will be produced in the combustion of 6.25 mol of methane?
Thursday, May 22, 2014 at 2:46am

Chemistry
The solubityof a compound in water is 6.8g/100ml at 0degreesC and 0.33g/100ml at 25degreesC.calculate the amount of water required to crystallize 10g of the compound.If the compound is collected at 25degreesC what is the maximum possible yield present?
Thursday, May 22, 2014 at 2:43am

Science(chemistry) please help me fast
When you take a block of butter out of the fridge,it is hard.however,after 15 minutes at room temperature it is soft enough to spread.use kinetic theory to explain the above observation
Thursday, May 22, 2014 at 1:16am

Science(chemistry)
When you take a block of butter out of the fridge,it is hard.however,after 15 minutes at room temperature it is soft enough to spread.use kinetic theory to explain the above observation
Thursday, May 22, 2014 at 1:15am

analytical chemistry
A solution containing 0.40 M B (a weak base) and 0.20 M BH+ (the salt of the weak base) has a pH = 10.30. What is the pH after 25 mmol of HCl is added to 250 mL of this solution?
Thursday, May 22, 2014 at 1:01am

chemistry
initially 1 mol each of gaseous carbon dioxide, co2(g) and hydrogen h2(g) is inhected into a 10.0L reaction chamber at 986 degrees. What is the predicted concentration of each entity at equilibrium? the equation is as follows: co2(g)+ h2(g)= co(g)+h20 (g) k=1.60 at 986 degrees
Thursday, May 22, 2014 at 12:03am

chemistry
Calculate the current in ampheres required to produce 15.0g in 2 hrs.
Wednesday, May 21, 2014 at 5:32pm

Chemistry
Suppose that coal of density 1.5g/cm3 is pure carbon. The combustion of carbon is described by the equation C+O2---> CO2 ∆H◦ = −394 kJ What is the value of q (heat) a ump of coal the size of 7.5cm*7cm*6.5cm is burned? answer in kJ what mass of water can be...
Wednesday, May 21, 2014 at 4:25pm

Chemistry
Hey guys so I was absent for my class and my teacher STILL wants me to figure out how to do limiting reactant and theoretical yield I tried Khan academy and it was no use. So basically the first question is : My data is : Mass of lead nitrate = 5.03g and Mass of Potassium ...
Wednesday, May 21, 2014 at 4:16pm

Chemistry
Ammonia is produced when Nitrogen gas reacts with Hydrogen gas, as shown by the equation below: N2 + 3H2 --> 2NH3 If the percentage yield is 90%, what would be your experimental yield of NH3 if 145.8g of N2 react? 2) 2Mg + O2 --> 2MgO A) If 50g of Mg reacts with 50g of ...
Wednesday, May 21, 2014 at 3:55pm

Chemistry
Ammonia is produced when Nitrogen gas reacts with Hydrogen gas, as shown by the equation below: N2 + 3H2 --> 2NH3 If the percentage yield is 90%, what would be your experimental yield of NH3 if 145.8g of N2 react? 2) 2Mg + O2 --> 2MgO A) If 50g of Mg reacts with 50g of ...
Wednesday, May 21, 2014 at 3:55pm

Chemistry
A sample of H2 is collected over water such that the combined hydrogen–water vapor sample is held at a pressure of 1 standard atmosphere. What is the partial pressure of the H2 if that of the water vapor is 2.5 kPa? A. 103.8 kPa B. 98.8 kPa C. 2.5 kPa D. 101.3 kPa B or C???
Wednesday, May 21, 2014 at 3:19pm

Science(chemistry)
Give one word/term for the following descriptions during this type of reaction,the appearance,colour or shape of a substance is changed
Wednesday, May 21, 2014 at 2:58pm

chemistry
How many grams of magnesium metal will react completely with 5.2 liters of 4.0 M HCl? Show all of the work needed to solve this problem. Mg (s) + 2 HCl (aq) yields MgCl2 (aq) + H2 (g)
Wednesday, May 21, 2014 at 2:24pm

Chemistry
How many grams of iron metal do you expect to be produced when 245 grams of an 80.5 percent by mass iron (II) nitrate solution reacts with excess aluminum metal? Show all of the work needed to solve this problem. 2 Al (s) + 3 Fe(NO3)2 (aq) yields 3 Fe (s) + 2 Al(NO3)3 (aq)
Wednesday, May 21, 2014 at 2:21pm

chemistry
The volume of a gas is 150 mL at 240.0 kPa pressure. What will the pressure be when the volume is reduced to 100.0 kPa, assuming the temperature remains constant?
Wednesday, May 21, 2014 at 2:04pm

Science(chemistry)
Give one word/term for the following description in any given chemical compound,the elements always combine in the same proportion with each other
Wednesday, May 21, 2014 at 1:55pm

chemistry
Calculate a value for the solubility of (NH4)2C2O4H2O in g/100 cm3 at 298 K
Wednesday, May 21, 2014 at 9:10am

chemistry
i need to find the enthalpy for COF2 F2 (g) + CO (g) --> COF2 (g) i found -507 but i am not sure if it is correct
Wednesday, May 21, 2014 at 7:12am

Chemistry
Stoichiometry; Find the percent yield of solid calcium carbonate made when 5.0 mL of 1.0 M Sodium Carbonate reacts with 0.40g Calcium Chloride Balanced Equation; Na2(CO3)+CaCl2-->2NaCl+CaCo3 could you please help me step by step to find the theoretical yield as well as the ...
Wednesday, May 21, 2014 at 12:28am

Chemistry
A 1N solution of NaOH is diluted 4/20 then rediluted 1:50. What is the final normality? How many grams of NaOH are present in 100ml of the final solution? I sort of understand the basic concept, but I don't really know how to do normality problems.
Tuesday, May 20, 2014 at 9:50pm

Chemistry
If 150 mg of aspirin are rinsed with three portions of 10 mL of water at 25 degrees Celsius, how much aspirin is recovered? Solubility of aspirin in water at 25 degrees Celsius is one gram of aspirin per 300 mL of water.
Tuesday, May 20, 2014 at 9:33pm

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