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Hannah

Questions and answers by Hannah, page 10

Questions (2,007)

The vapor pressure of the liquid HF is measured at different temperatures. The following vapor pressure data are obtained.Temper
1. 5 answers
2. 832 views
The lower frequency limit for human hearing is usually considered to be 20.0 Hz. (a) What isthe speed of sound in m/s if the air
1. 3 answers
2. 1,354 views
Calculate the distance traveled in 6.00 s as a given sound moves through (a) water at 25.0ºCin m/s; (b) water at 25.0ºC in
1. 3 answers
2. 1,534 views
What is the frequency of the electromagnetic radiation from outer space that reaches theearth with a wavelength of 1 x 105 m,
1. 1 answer
2. 462 views
The following information is given for ether, C2H5OC2H5, at 1atm:boiling point = 34.6oC Hvap(34.6oC) = 26.5 kJ/mol melting point
1. 3 answers
2. 1,302 views
Which aqueous solution below is expected to have the lowest freezing point? Assume 100% dissociation for ionic species.1)0.25m
1. 9 answers
2. 670 views
1) In comparing the phase diagram for water with that of a solution of sugar in water, all of the following decrease excepta)
1. 4 answers
2. 1,316 views
1)For electrolyte solutions, the _____ the concentration of the electrolyte and the ____ the ion charges, then the ____ the
1. 3 answers
2. 479 views
1) The molecular mass of a substance was determined by the freezing point depression technique. The minimum data required for
1. 2 answers
2. 593 views
1) If exactly 100.0 grams of NaCl (mm=58.44g/mol) are dissolved in 300 grams of water (mm=18.02g/mol), the mole fraction of NaCl
1. 6 answers
2. 541 views
when 7.50 grams of iodine (I2) is added to 48.7grams of carbon tetrachloride (CCl4), the iodine dissolves and a solution is
1. 2 answers
2. 659 views
1) The molecular mass of a substance was determined by the freezing point depression technique. The minimum data required for
1. 6 answers
2. 1,993 views
Which aqueous solution below is expected to have the lowest freezing point? Assume 100% dissociation for ionic species.1)0.25m
1. 5 answers
2. 1,792 views
Which of the following contributes to the bubbling from a cold can of soda when left standing at room temperature. Choose all
1. 3 answers
2. 765 views
If all ionic substances completely ionized, the aqueous solution with the lowest freezing point would be1)0.25m NH4NO3 2)0.30m
1. 7 answers
2. 667 views
1) Benzene freezes at 5.45 degrees celsius. The Kf for benzene is -5.07C/m. What would be the freezing point of a 0.210m
1. 4 answers
2. 677 views
How many grams of water are needed to dissolve 27.8g of NH4NO3 (80.0 g/mol) in order to prepare a 0.452 m (molal) solution?27.8g
1. 7 answers
2. 3,244 views
A solution was made by dissolving 62.07 grams of a compound in 500g of water. The compound was not ionic. The freezing point of
1. 4 answers
2. 789 views
How would I find the molality of NaCl with the following information?initial temperature= 98degrees celsius final temp=100
1. 1 answer
2. 1,056 views
1) The molecular mass of a substance was determined by the freezing point depression technique. The minimum data required for
1. 4 answers
2. 901 views
The vapor pressure of chloroform is 173.11 mm Hg at 25 degrees celsius. A nonvolatile, nonelectrolyte that dissolves in
1. 2 answers
2. 976 views
I had to perform an experiment using a coffee-cup calorimeter to determine the enthalpies of two separate reactions. For part 1
1. 10 answers
2. 767 views
I had to perform an experiment using a coffee-cup calorimeter to determine the enthalpies of two separate reactions. For part 1
1. 2 answers
2. 578 views
For the equation:deltaHrxn = qrxn / mol substance to calculate deltaH per mole what does the mol substance mean? Does this mean
1. 1 answer
2. 537 views
For the equation:deltaHrxn = qrxn / mol substance to calculate deltaH per mole what does the mol substance mean? Does this mean
1. 9 answers
2. 670 views
Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g) delta H1?MgO(s) + 2HCl(aq) ->MgCl2(aq) + H2O(l) delta H2? To make these equations add up
1. 5 answers
2. 5,776 views
A solution was made by dissolving 62.07grams of a compound in 500g of water. The compound was not ionic. The freezing point of
1. 2 answers
2. 622 views
I had to perform an experiment for the freezing point depression in which we had to determine the frezzing points of water as a
1. 7 answers
2. 647 views
How would I find the molality of NaCl with the following information?initial temperature= 98degrees celsius final temp=100
1. 3 answers
2. 836 views
The vapor pressure of chloroform is 173.11 mm Hg at 25 degrees celsius. A nonvolatile, nonelectrolyte that dissolves in
1. 2 answers
2. 1,366 views
The vapor pressure of chloroform is 173.11 mm Hg at 25 degrees celsius. A nonvolatile, nonelectrolyte that dissolves in
1. 7 answers
2. 639 views
A reaction has a rate law, rate = k times A times B squared. What is the overall order of the reaction.I think that the order is
1. 4 answers
2. 659 views
The vapor pressure of diethyl ether is 463.57 mm Hg at 25 degrees celsius. How many grams of aspirin C9H8O4, a non volatile
1. 3 answers
2. 1,018 views
The units of a rate constant for zero, first, and second order reactions are given in the textbook. If the time units are
1. 2 answers
2. 543 views
1) The reaction A + B + C = products has a rate law rate = k times A times C squared. Which of the following will result in an
1. 10 answers
2. 566 views
1. Nitric oxide reacts with bromine gas at elevated temperatures according to the equation,2 NO(g) + Br2(g) = 2 NOBr(g) The
1. 4 answers
2. 915 views
Bauxite ore contains aluminum oxide Al2O3(s) which is decomposed using electricity to produce aluminum metal and oxygen gas.
1. 4 answers
2. 2,746 views
I had to perform an experiment for the freezing point depression in which we had to determine the freezing points of water as a
1. 3 answers
2. 1,046 views
The vapor pressure of chloroform is 173.11 mm Hg at 25 degrees celsius. A nonvolatile, nonelectrolyte that dissolves in
1. 3 answers
2. 959 views
The vapor pressure of diethyl ether is 463.57 mm Hg at 25 degrees celsius. How many grams of aspirin C9H8O4, a non volatile
1. 4 answers
2. 706 views
The common laboratory solvent diethyl ether (ether) is often used to purify substances dissolved in it. The vapor pressure of
1. 2 answers
2. 826 views
The initial concentration of a reactant in a first order reaction is 0.620 molar. What will be its concentration after 3
1. 4 answers
2. 1,793 views
1)For the reaction, A = B + C, the rate law is k(A). If it takes 80.0 seconds for 70.0% of a 10.0 gram sample of A to be
1. 2 answers
2. 580 views
The decomposition of an aldehyde solution in carbon tetrachloride is a first order reaction with a rate constant of 1.20 x 10-3
1. 3 answers
2. 3,053 views
8. The half-life of a reaction was found to be inversely dependent on the concentration of the starting material. Thus, we can
1. 2 answers
2. 662 views
For the reaction, 2 XO + O2 = 2 X02, some data obtained from measurement of the initial rate of reaction at varying
1. 2 answers
2. 542 views
I am trying to find th e# of moles of NaCl but I am not sure of the units.3.914g NaCl / mm=58.44 so is it 3.914g/mol divided by
1. 4 answers
2. 308 views
I had to perform an experiment for the freezing point depression in which we had to determine the frezzing points of water as a
1. 9 answers
2. 1,230 views
For the reaction, 2 XO + O2 = 2 X02, some data obtained from measurement of the initial rate of reaction at varying
1. 4 answers
2. 665 views
I am trying to find th e# of moles of NaCl but I am not sure of the units.For my answer I get 0.0669. Should I leave it like
1. 1 answer
2. 307 views
1) Given this data in a study on how the rate of a reaction was affected by the concentration of the reactantsInitial Rate, RUN
1. 2 answers
2. 1,277 views
had to perform an experiment for the freezing point depression in which we had to determine the frezzing points of water as a
1. 1 answer
2. 501 views
For 0.06697mol / 0.1kg = 0.6697 mol/kg does my answer have the correct amount of sig figs?Same for 0.1004mol / 0.1kg =
1. 1 answer
2. 373 views
I have to find the calculation of Van't Hoff factor "i" for NaCl and sucrose. The directions say to use the equationdelta Tf =
1. 7 answers
2. 1,159 views
I need to calculate the molecular mass of ehtylene glycol based on the freezing point depression.The teacher said that for
1. 5 answers
2. 447 views
Suppose your power company charges $1.00 per kWh as its power rate. (a) What is thepower in kW for an air conditioner that pulls
1. 1 answer
2. 429 views
1) For a freezing point depression experiment we had to create an ice bath and add salt to the ice. I have to answer the
1. 1 answer
2. 724 views
I need to calculate the molecular mass of ehtylene glycol based on the freezing point depression.The teacher said that for
1. 1 answer
2. 495 views
After performing a freezing point depression experiment I had to find the molecular weight of glycol. Now I have to answer the
1. 3 answers
2. 498 views
Balance this equation:I2+HNO3 = HIO3+NO2+H2O
1. 2 answers
2. 674 views
Chem Help! Limiting and excess reagent?Identify the limiting and excess reagent for each of the following scenarios involving
1. 1 answer
2. 483 views
I need to convert these 5 values of time into minutes.1)1.07 1min 7 seconds 2) 6.00 3) 5.02 4) 1.32 5) 25.5 seconds The example
1. 4 answers
2. 402 views
I had to perform an experiment for rate of reaction.I have to calculate the concentration of Na2S2O3 in the reaction solutions
1. 3 answers
2. 470 views
1) The reaction: A + 3B = D + F was studied and the following mechanism was finally determinedA+B=C (fast) C+B=D+E (slow) E+B=F
1. 3 answers
2. 1,217 views
1) A catalyst alters the rate of a reaction bya. changing the products in the reaction. b. increasing the activation for the
1. 1 answer
2. 493 views
4x+y=-17-3x+y=4 Please help me solve each system of equation and show your work.
1. 1 answer
2. 366 views
1) The decomposition of hydrogen peroxide in solution and in the presence of iodide ion was studied in laboratory, and the
1. 1 answer
2. 661 views
I had to perform an experiment for rate of reaction.The point of the experiment was to show how changes in reactant
1. 7 answers
2. 1,042 views
A ball is dropped from 27.0 feet above the ground. Using energy considerations only, what is the velocity of the ball prior to
1. 2 answers
2. 740 views
how many seconds will elapse between seeing lightning and hearing the thunder if the lightning strikes miles away and the
1. 4 answers
2. 1,214 views
1) The decomposition of hydrogen peroxide in solution and in the presence of iodide ion was studied in laboratory, and the
1. 1 answer
2. 868 views
1) The decomposition of hydrogen peroxide in solution and in the presence of iodide ion was studied in laboratory, and the
1. 1 answer
2. 637 views
I had to perform an experiment for rate of reaction.The point of the experiment was to show how changes in reactant
1. 3 answers
2. 1,642 views
I have to convert 1 minute 25 seconds into just seconds. Im not sure what to do.Thank you!!
1. 1 answer
2. 341 views
(2.50mL)(0.10M) / 75.00mL = 0.003333Im not sure how many sig figs to use. Would it 3.33e-3?
1. 1 answer
2. 378 views
I have to calculate the concentration of I2 produced (# of moles of I2 produced / L) based on the stoichiometric ratio in the
1. 5 answers
2. 1,090 views
(0.80M)(5.00mL) = c2 (75.00mL)c2 = 5.33e-2 M Is the correct amount of sig figs?
1. 5 answers
2. 592 views
So I'm supposed to verify the solution of the differential equation. The solution is y=e^(-x). The differential equation is 3y'
1. 3 answers
2. 1,128 views
A ball is dropped from 27.0 ft above the ground. (a) Using energy considerations only, whatis the velocity of the ball just
1. 4 answers
2. 1,030 views
How many seconds will elapse between seeing lightning and hearing the thunder if the lightning strikes 2 mi away and the
1. 2 answers
2. 755 views
(0.50M)(3.50mL) = c2(75.00)c2= 2.3e-2 Is this correct?
1. 7 answers
2. 340 views
I have to calculate the concentration of I2 produced (# of moles of I2 produced / L) based on the stoichiometric ratio in the
1. 9 answers
2. 747 views
I have to calculate the concentration of I2 produced (# of moles of I2 produced / L) based on the stoichiometric ratio in the
1. 1 answer
2. 535 views
1 mintue 25 seconds converted into seconds.I know there are 60 minutes in an hour and seconds 60 in a minute. Am I just dividing
1. 1 answer
2. 446 views
For my rate of reaction experiment I have to answer the question "why did we ask you to measure the room termperature and
1. 3 answers
2. 720 views
I need to find the order of a reaction with respect to the reactants.I set up my equation like this: 5.33e-2 M / 2.66e-2M =
1. 2 answers
2. 809 views
I need to find the order of a reaction with respect to the reactants.I set up my equation like this: 5.33e-2 M / 2.66e-2M =
1. 1 answer
2. 344 views
I posted a question like this but my numbers were actually wrong. These are the correct ones.5.94e-3 / 1.11e-3 = 5.33e-2/2.66e-2
1. 4 answers
2. 352 views
I posted a question like this but my numbers were actually wrong. These are the correct ones.5.94e-3 / 1.11e-3 = 5.33e-2/2.66e-2
1. 1 answer
2. 464 views
If the reaction Cl2 (g) + O3 (g) = Cl2O (g) + O2 (g) occurred in just two steps, what would be the overall order of the reaction
1. 1 answer
2. 352 views
The equation A + 2 B = C + D describes an elementary reaction, which takes place in a single step. Thus, the rate law must be?My
1. 1 answer
2. 341 views
For H2(g) + Br2(g) -> 2HBr(g) k=64<- Ice table: H2 Br2 HBr I 0.10 0.10 0 C -x -x +2x E Solve for HBr at equilibrium I do not
1. 7 answers
2. 988 views
A particular reaction has an activation energy of 51.6kJ/mol-rxn. How much faster is the reaction at 50 degrees C versus
1. 4 answers
2. 440 views
I ahve to find the concentration of product, (Fe(SCN)^2+) at equilibrium.We have to use the equation k=A/C I have the value for
1. 5 answers
2. 373 views
2NO(g) + Br2(g) -> 2NOBr(g)What is the rate equation? My answer is k[NO]2[Br2] Is this correct? Thank you!!!!
1. 4 answers
2. 1,662 views
ln k2/2.34 = -103,000J/8.314J/Kol[1/339K - 1/359K]ln k2/2.34 = -2.035941063 I am not sure what to do now!!
1. 3 answers
2. 283 views
For the reaction, 2 SO2(g) + O2(g) == 2 SO3(g), at 450.0 K (Kelvin) the equilibrium constant, Kc, has a value of 4.62. A system
1. 3 answers
2. 899 views
The equilibrium constant, Kc for the system,CaO(s) + CO2(g) == CaCO3(s), is A. Kc = (CaO) (CO2) / (CaCO3) B. Kc = (CO2) C. Kc =
1. 4 answers
2. 2,459 views
The reaction, 2 SO3(g) == 2 SO2(g) + O2(g) is endothermic.Predict what will happen if the temperature is increased. A. the
1. 3 answers
2. 2,043 views
For the reaction system, 2 H2O(g) + O2(g) == 2 H2O2 (g), the equilibrium concentrations are(H2O2) = 0.120 M; (H2O) = 0.860 M;
1. 6 answers
2. 632 views

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