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July 29, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry
What is the difference between biochemical, pharmaceutical, and diagnostic chemical reactions in healthcare? What is a specific example that exists for each of these chemical reaction types above and why might it be of importance to healthcare professionals? List a balanced ...
Friday, May 16, 2014 at 3:13am

Chemistry
What effect would be on the normality of unknown acid? Explain why. a) if NaOH solution is pipetted into a conical flask containing some distilled water b) if an air bubble is out from the burette c) if too much acid is ran out during both titrations although the volumes of ...
Thursday, May 15, 2014 at 6:07pm

chemistry
The level of water in an Olympic size swimming pool (50.0 meters long, 25.0 meters wide, and about 2 meters deep) needs to be lowered 5.0 cm. If the water is pumped out at a rate of 4.7 liters per second, how long will it take to lower the water level 5.0 cm?
Thursday, May 15, 2014 at 4:51pm

chemistry pls help me asap
2.08g of metal Y react with 0.96g of oxygen to form a metal oxide.The empirical formula of the metal oxide is Y2O3.What is the relative atomic mass of metal Y.
Thursday, May 15, 2014 at 5:17am

chemistry
The decomposition of N2O5 proceeds according to the following equation 2 N2O5(g) → 4 NO2(g) + O2(g). The rate constant, k, for the reaction at 298 K is 2.20 x 10-3 min-1. If a reaction is set up in a vessel at 298 K, with an initial concentration of 0.343 mol L-1; what ...
Thursday, May 15, 2014 at 12:53am

chemistry
Given the thermochemical equation: 2 Al(s) + 3/2 O2(g) > Al2O3(s) ΔH = -95.7 kJ find the heat of reaction, ΔH, for the following reaction: 2 Al2O3(s)> 4 Al(s) + 3 O2(g) Select one: a. -95.7 kJ b. +95.7 kJ c. -47.8 kJ d. +47.8 kJ e. +191.4 kJ
Thursday, May 15, 2014 at 12:03am

chemistry
find the heat of reaction deltaT = -95.7KJ 2 Al2 O3(s) > 4Al (s) + 3 O2 (g) a. - 95.7kj b. +95.7kJ c. -47.8 KJ d. +47.8KJ e. +191.4KJ
Wednesday, May 14, 2014 at 11:40pm

chemistry
The administration of 100mg or more of morphne (molar mass 283) to a patient would be lethel. which of the following would you consider to be a safe dose. a. 1ml of a 1 percent solution (w/v) b. 1ml of a 0.05 M solution c. 1ml of a 100ml/mg solution d. 0.5ml of a 1M solution e...
Wednesday, May 14, 2014 at 11:01pm

chemistry
The administration of 100mg or more of morphne (molar mass 283) to a patient would be lethel. which of the following would you consider to be a safe dose. a. 100ml of a 20 percent solution (w/v) b. 50ml of a 2 M solution c. 25ml of a 10g/100ml solution d. 0.5ml of a 1M ...
Wednesday, May 14, 2014 at 10:41pm

Chemistry
Suppose a patient is given 140mg of I−131, a beta emitter with a half-life of 8.0 days. Assuming that none of the I−131 is eliminated from the person's body in the first 4.0 hours of treatment, what is the exposure (in Ci) during those first four hours? Express...
Wednesday, May 14, 2014 at 9:38pm

Chemistry
Tarnish on iron is the compound FeO. A tarnished iron plate is placed in an aluminum pan of boiling water. When enough salt is added so that the solution conducts electricity, the tarnish disappears. Imagine that the two halves of this redox reaction were separated and ...
Wednesday, May 14, 2014 at 9:23pm

Chemistry
Ni2+(aq)+Mg(s)→Ni(s)+Mg2+(aq) Indicate the half-reaction occurring at Anode. Indicate the half-reaction occurring at Cathode.
Wednesday, May 14, 2014 at 8:11pm

Chemistry
Consider the following reaction: CaCO3(s)→CaO(s)+CO2(g). Estimate ΔG∘ for this reaction at each of the following temperatures. (Assume that ΔH∘ and ΔS∘ do not change too much within the given temperature range.) A) 310K B) 1070K C) 1470K ...
Wednesday, May 14, 2014 at 8:07pm

Chemistry
Suppose a patient is given 140mg of I−131, a beta emitter with a half-life of 8.0 days. Assuming that none of the I−131 is eliminated from the person's body in the first 4.0 hours of treatment, what is the exposure (in Ci) during those first four hours? Express...
Wednesday, May 14, 2014 at 8:02pm

chemistry
1) According to Bronsted-Lowry theory acids are _________ bases are _________
Wednesday, May 14, 2014 at 7:07pm

chemistry
A disc of wax has several hot metal sampes placed on it. The samples are of diffrent metals. They are all at the same temperature and have the same mass and contact area with the wax. How will the heat capacity of each metal sample afect the rate at which it melts the wax
Wednesday, May 14, 2014 at 6:40pm

chemistry
calculate the mass percent of the following solutions 1.25 g CaCL2 in 35.0 g H2O I am not sure if i have the correct set up (1.25g CaCl2/1.25 g CaCl2 + 35.0 g H20)*100
Wednesday, May 14, 2014 at 5:51pm

chemistry
how many joules of energy are needed to change 275 g of water from 15 degrees C to steam at 100 degrees C
Wednesday, May 14, 2014 at 5:31pm

Chemistry
What are the three essential parts to make a battery? Cell reducing agent acid fuse porous barrier or salt bridge voltage regulator oxidizing agent
Wednesday, May 14, 2014 at 3:39pm

chemistry
Write the balanced equation for the neutralization reaction between H3PO4 and NaOH in aqueous solution. Phases are optional.
Wednesday, May 14, 2014 at 2:53pm

Chemistry
How many milliliters of 4.25 M H2SO4(aq) are needed to react completely with 45.9 g of BaO2(s)?
Wednesday, May 14, 2014 at 2:39pm

Chemistry
In the reaction C(s) + 2S(s) ¨ CS2(l), the change of enthalpy (ƒ¢H) is 89.3 kJ. Calculate the amount of heat absorbed when 6.33 g of carbon disulfide is formed.
Wednesday, May 14, 2014 at 11:40am

Chemistry
How many kilojoules of heat are absorbed when 1.2 L of water is heated from 24oC to 86oC?
Wednesday, May 14, 2014 at 11:36am

chemistry
The complete combustion o​f propane, C3H8(g), is&nb​sp;represented by the equ​ation: C3H8(g) + 5 O2(g) &#​8594; 3 CO2(g) + 4&n​bsp;H2O(l) ΔH° ...
Wednesday, May 14, 2014 at 5:04am

Chemistry
calculate the heat liberated when 15.0 g glucoseis metabolized to CO2 and H2O
Wednesday, May 14, 2014 at 2:57am

Chemistry
A student places a zinc electrode in a 0.80 M Zn2+(aq) solution which is connected by an electrolyte to a 1.30 M Ag+(aq) solution containing a silver electrode. (Note that the solution concentrations are not standard). Determine the initial voltage of the cell at 298 K. Show ...
Tuesday, May 13, 2014 at 11:53pm

Chemistry
1) Using a table of standard electrode potentials (such as the one in your textbook), calculate the standard cell potential for a cell made by placing a zinc electrode in a Zn2+(aq) solution which is connected by an electrolyte to a Ag+(aq) solution containing a silver ...
Tuesday, May 13, 2014 at 11:52pm

Chemistry
1) Using a table of standard electrode potentials (such as the one in your textbook), calculate the standard cell potential for a cell made by placing a zinc electrode in a Zn2+(aq) solution which is connected by an electrolyte to a Ag+(aq) solution containing a silver ...
Tuesday, May 13, 2014 at 11:52pm

Chemistry
Using a table of standard electrode potentials (such as the one in your textbook), calculate the standard cell potential for a cell made by placing a zinc electrode in a Zn2+(aq) solution which is connected by an electrolyte to a Ag+(aq) solution containing a silver electrode...
Tuesday, May 13, 2014 at 11:47pm

Chemistry
A student places a zinc electrode in a 0.80 M Zn2+(aq) solution which is connected by an electrolyte to a 1.30 M Ag+ (aq) solution containing a silver electrode. (Note that the solution concentrations are not standard). Determine the initial voltage of the cell at 298 K. Show ...
Tuesday, May 13, 2014 at 11:43pm

Chemistry ASAP
Using a table of standard electrode potentials (such as the one in your textbook), calculate the standard cell potential for a cell made by placing a zinc electrode in a Zn2+(aq) solution which is connected by an electrolyte to a Ag+ (aq) solution containing a silver electrode...
Tuesday, May 13, 2014 at 11:43pm

Chemistry
What is the pressure, in torr, of a gas whose density is 8.0 g/L at a temperature of 25 C above standard temperature and whose molecular weight is 75 g/mol?
Tuesday, May 13, 2014 at 9:48pm

chemistry
if 21.54 grams of caco3 is added to an ecxess of HCl in the equation Cacl3+2Hcl produces Cacl3+co2+H20, what mass does co2 produce?
Tuesday, May 13, 2014 at 9:04pm

Chemistry
How many mL of concentrated HCl would be required to make 200mL of a 4M solution? Specific gravity = 1.2, assay = 40%
Tuesday, May 13, 2014 at 8:36pm

college chemistry
if 75 g of ice at 0.0 degrees C were added to 1.5 L of water at 75 degrees C what would be the final temperature of the mixture
Tuesday, May 13, 2014 at 8:00pm

chemistry
Upon heating 125g MgSO4 • 7 H2O: a) how many grams of water can be obtained?
Tuesday, May 13, 2014 at 7:44pm

chemistry
45.3 m + 12.344 m + 1000m - 1.34 m = ________________________ is 1 056.304 m the answer?
Tuesday, May 13, 2014 at 7:26pm

chemistry
I got the molecular formula is NaHCO3+H2SO4=Na2SO4+CO2+H2CO3 and i got the total ionic formula is NaOH+H2CO2(aq)= Na2CO3 + HOH but i am having trouble finding the net ionic formula can you please help me thank you
Tuesday, May 13, 2014 at 7:04pm

chemistry
1. 35cm + 8.3m + 75.341 km + 80,000 mm = ____________ 2.(43.7m + 39.3cm) ÷ 25.332 m/s = _____________ * focus on significant figures
Tuesday, May 13, 2014 at 6:22pm

Chemistry
A sample of 8 grams of NaOH is dissolved into 599 mL of aqueous 0.250 M NaOH (assume no volume change). This solution is then poured into 1.68 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution? ...
Tuesday, May 13, 2014 at 6:18pm

chemistry
convert : 1. 25.25 cm to Tm: 2. 1 zm to Zm: 3. 25 m3 to cL: 4. 1.23 x 10^4 L to m3: 5. 1000 cm3 to L: 6. 8,000,000 km to nm:
Tuesday, May 13, 2014 at 5:49pm

chemistry
Light travels at 3.00 x 10^8 m/s. If the starlight from the Unicorn galaxy takes 1 year 47 days and 2 hours to reach us. How far away is it in kilometers?
Tuesday, May 13, 2014 at 5:23pm

Chemistry
if you dissolve 25.5 g of KBr in enough water to make 1.75 L of solution, what is the molarity of the solution
Tuesday, May 13, 2014 at 2:49pm

Chemistry
Calculate the volume of NaOH 0.5 mol/L necessary to neutralize 300 mL of HCl 0.2 M. na= how do I calculate this? Ma= 0.2 M Va= 0.300 L nb= 0.5 mol Mb= 0.5 M Vb= ?
Tuesday, May 13, 2014 at 2:10pm

Chemistry
What kind of compound is table salt and how does it dissolve in water? Would salt dissolve in vegetable oil? Why or Why not?
Tuesday, May 13, 2014 at 12:43am

chemistry
what is the final temperature of amixture containning 25 grams of ice at -20 degree celciusadded to water at room temperature 22oC mass of water is 50g followed the steps given by you but not getting the answer (0degree celsius) ice at -20 to ice at 0 degree=mcdelta T=25*2.06*...
Monday, May 12, 2014 at 11:49pm

Chemistry
Predict which compound will have the higher boiling point and explain how you made your choice by including intermolecular forces. 1. H2O or CH2O 2. CS2 or CH4
Monday, May 12, 2014 at 11:46pm

chemistry
what is the final temperature of amixture containning 25 grams of ice at -20 degree celciusadded to water at room temperature 22oC mass of water is 50g followed the steps given by you but not getting the answer (0degree celsius) ice at -20 to ice at 0 degree=mcdelta T=25*2.06*...
Monday, May 12, 2014 at 10:45pm

chemistry
what is the final temperature of amixture containning 25 grams of ice at -20 degree celciusadded to water at room temperature 22oC mass of water is 50g followed the steps given by you but not getting the answer (0degree celsius)
Monday, May 12, 2014 at 9:06pm

Chemistry
Consider a chromium-silver voltaic cell that is constructed such that one half-cell consists of the chromium, Cr, electrode immersed in a Cr(NO3)3 solution, and the other half-cell consists of the silver, Ag, electrode immersed in a AgNO3 solution. The two electrodes are ...
Monday, May 12, 2014 at 6:27pm

Chemistry
Suppose a patient is given 140mg of I−131, a beta emitter with a half-life of 8.0 days. Assuming that none of the I−131 is eliminated from the person's body in the first 4.0 hours of treatment, what is the exposure (in Ci) during those first four hours? Express...
Monday, May 12, 2014 at 6:26pm

Chemistry
Calculate ΔG∘ at 298 K for the following reactions. A) Ca(s)+CO2(g)+12O2(g)→CaCO3(s) B) 2KClO3(s)→2KCl(s)+3O2(g) C) CO(g)+H2O(g)→H2(g)+CO2(g)
Monday, May 12, 2014 at 6:25pm

Chemistry
Consider the following reaction: CaCO3(s)→CaO(s)+CO2(g). Estimate ΔG∘ for this reaction at each of the following temperatures. (Assume that ΔH∘ and ΔS∘ do not change too much within the given temperature range.) A) 310K and is it ...
Monday, May 12, 2014 at 6:24pm

chemistry
a piece of iron measures 10.5cm by 5.25cm by 10.2mm and the density of theiron is 7.86g/cm cubed. what is the mass of the iron?
Monday, May 12, 2014 at 12:23pm

science
can u suggest 5 advantages and 5 disadvantages of diffusion in chemistry
Monday, May 12, 2014 at 12:02pm

chemistry
An ideal solution of 5.00 mole benzene and 3.25 mole toluene. At 298 K, the vapor pressure of the pure benzene and toluene were 96. Torr, and 28.9 Torr, respectively. At what pressure does the vapor phase appear first, if the pressure above this solution is reduced from 760 ...
Monday, May 12, 2014 at 5:55am

chemistry
preparation of N/10 NaoH
Monday, May 12, 2014 at 3:58am

chemistry
Radioactive decay is a process that follows first-order kinetics. The half-life of 32P is 0.03920 years; how long (in minutes) would it take for the amount of 32P to decrease to 53.25% of its initial amount? I don't understand at all what to do here
Sunday, May 11, 2014 at 9:29pm

Chemistry 104
The pH of 0.3 HSO3- is: (How can this problem be solved?) The final answer is 4.41 However, I keep getting 3.76
Sunday, May 11, 2014 at 8:02pm

Chemistry Who step by step
A 0.8870g sample of a mixture of nacl and nan03 is dissolved in water, and the solution is then treated with an excess of AGN03 to yield 1.913g of agcl. Calculate the percent by mass of the nacl in the mixture. 1.913g / 143 = 0.0133 x/58 ( 0.8870g -x) y/85 = 0.0133 0.01529 - 0...
Sunday, May 11, 2014 at 6:29pm

chemistry
Answer the following math questions focusing on significant figures a. 45.3L x 10 mol/L = b. 67.894 g ÷ 2.56 L = c. 45.3m + 12.344m + 1000m – 1.34m = d. 35cm + 8.3m + 75.341 km + 80,000 mm = e. (43.7m + 39.3cm) ÷ 25.332 m/s =
Sunday, May 11, 2014 at 5:45pm

chemistry
how many significant figures do the following numbers have? a. 1.2056 x 10^4 m: b. 1 x 10^89 km: c. 12,000 L: d. 0.000345 cm: e. 1.00036 mL: f. 0.2056000 m:
Sunday, May 11, 2014 at 5:34pm

(2-8) Chemistry - Science (Dr. Bob222)
Which of the following statements is correct? A) The internal energy of a system increases when more work is done by the system than the heat that flows into the system. B) The system does work on the surroundings when an ideal gas expands against a constant external pressure...
Sunday, May 11, 2014 at 3:59pm

Chemistry
if you produce 5.7 of H2O, how many liters of O2 will be required?
Sunday, May 11, 2014 at 2:32pm

Chemistry
How can I determine the overall electrochemical reaction that proceeds spontaneously? Cd2+ | Cd, Co2+ | Co 1. Cd+Co2+ −¨Cd2++Co 2. Co+Cd2+ −¨Co2++Cd (1. and 2. are answer choices)
Sunday, May 11, 2014 at 2:17pm

Chemistry
Given the Na+/Na and K+/K half-cells, determine the overall electrochemical reaction that proceeds spontaneously and the E0 value. Answer in units of V Can you please explain the steps?
Sunday, May 11, 2014 at 2:12pm

chemistry
What is the energy released when steam at 25 g of steam at 10 degree celcius is cooled to ice at-10 degree celcius work heat change for the following changes calculated 150 degree Celsius steam --150 degree water 150 degree water to 0 degree water 100 degreewater-- 0 degree ...
Sunday, May 11, 2014 at 1:52pm

Chemistry help
I am not to sure how to approach the problem... Hydrazine is used as a rocket fuel because its reaction with oxygen is extremely exothermic: N2H4(liquid) + O2(g) ==> N2(g) + 2H2O(liquid) ΔH(reaction) = -615 kJ mol-1 What is the enthalpy of this reaction if water were ...
Sunday, May 11, 2014 at 12:10pm

chemistry
A solution is made by dissolving 811.0 cg of barium hydroxide, Ba(OH)2, in 0.1137 kg of water. What is the concentration in parts per million? I know the equation is: ppm= (mass of solute/mass of solution)10^6 Does the mass need to be in g or kg?
Sunday, May 11, 2014 at 11:33am

chemistry
Consider the following system, which is at equilibrium, 3C(s) + 3 H2(g) mc020-1.jpg CH4(g) + C2H2(g) The result of removing some C(s) from the system is that a) more CH4(g) and C2H2(g) are produced to replace that which is removed. b) Kc decreases. c) more C(s) is produced. d...
Sunday, May 11, 2014 at 8:50am

chemistry, first year university
Solid NH4N3 decomposes explosively according to the following equation: NH4N3(s) ⇌ 2N2(g) + 2H2(g) A small amount of ammonium azide was placed in a sealed container and the air was removed. The sample was then detonated. At equilibrium the total pressure in the container...
Sunday, May 11, 2014 at 8:49am

chemistry
Write equations for the ionisation in water of : A) hydrobromic acid B) nitrous acid C) carbonic acid D) sulfuric acid
Sunday, May 11, 2014 at 7:32am

chemistry
Why is it recommended to carry out iodometric titration as quickly as positive and to get the first end point?
Sunday, May 11, 2014 at 1:10am

chemistry
Match the name or structure with its functional group. Each molecule has only one functional group. My choices are alkane, alcohol, alkyne, carboxylic acid, alkene, aldehyde, ketone, ester, and ether. 1. 2-propanol- alcohol 2. 2-methoxypentane- alkane 3. formaldehyde- aldehyde...
Saturday, May 10, 2014 at 9:15pm

Chemistry
During an acid-base titration, 25 mL of NaOH 0.2 M were required to neutralize 20 mL of HCl. Calculate the pH of the solution for each: a) Before titration b) After adding 24.9 mL of NaOH c) At equivalence pt d) After adding 25. 1 mL of NaOH e) The pH of the equivalence pt ...
Saturday, May 10, 2014 at 7:58pm

Chemistry - Science (Dr. Bob222)
Liquid chloroform (CHCl3) is placed in a closed container and allowed to equilibrate with chloroform vapor. With the temperature held constant, additional chloroform is introduced into the system, and the vapor-liquid equilibrium is reestablished. Following this, the ...
Saturday, May 10, 2014 at 7:12pm

Chemistry
How would you write these chemical reactions?Can someone do one or two reactions for each problem, so I could get an idea of to them? ..I'm nit sure how most of the oeoducts wouls turn out..especially if it is a precipitate. 5. When Mn^2+ ions are separated from the ...
Saturday, May 10, 2014 at 5:33pm

Chemistry
Please explain how to set this problem: A solution has a density of 1.73 g/ml. If it's weighs 4.3 ounces, what is the volume. ?
Saturday, May 10, 2014 at 5:24pm

chemistry
This functional group can be generated by oxidation of an aldehyde. Oxidation is just the reaction with oxygen, but unlike combustion you are not producing carbon dioxide and water.
Saturday, May 10, 2014 at 5:15pm

chemistry
One kind of battery used in watches contains mercury(II) oxide. As current flows, the mercury(II) oxide is reduced to mercury. HgO(s) + H2O( ) + 2 e–  Hg( ) + 2 OH–(aq) If 2.3  10–5 amperes flows continuously for 1200 days, what mass of Hg( ) is ...
Saturday, May 10, 2014 at 4:47pm

chemistry
This type of functional group is often sweet smelling and may be used as a fragrance. When it reacts with water it will produce a carboxylic acid and an alcohol. I chose ester but it is wrong
Saturday, May 10, 2014 at 4:24pm

Organic Chemistry
A student obtains a yield of 79% from his salicylic acid. How many grams of salicylic acid will the student need to produce 135 g of aspirin?
Saturday, May 10, 2014 at 11:09am

(1-22)Chemistry - Science
Consider the following reaction: C(s) + H2O (g) ⇌ CO (g) + H2 (g) (Kp = 0.45 at 900 K) What is the equilibrium partial pressure of H2O when the initial partial pressure of water is 1.00 atm? a) 0.43 atm b) 0.58 atm c) 0.22 atm d) 0.52 atm e) 1.16 atm
Saturday, May 10, 2014 at 10:26am

(1-17)Chemistry - Science
Consider the reaction: SO2 (g) + NO2 (g)  SO3 (g) + NO (g) At T = 1000 K, where the reaction is exothermic with an equilibrium constant K = 9.00 If the reaction vessel is instead charged initially with SO3(g) and NO(g), each at a partial pressure of 0.500 atm, the ...
Saturday, May 10, 2014 at 10:24am

(1-16)Chemistry - Science
Consider the reaction: SO2 (g) + NO2 (g) ==> SO3 (g) + NO (g) At T = 1000 K, where the reaction is exothermic with an equilibrium constant K = 9.00 The reaction vessel is charged initially with all four gases, each at a pressure of 0.5 atm. After equilibrium is achieved, ...
Saturday, May 10, 2014 at 10:23am

(1-15) Chemistry - Science
Assume a gas of molecular mass M g/molecule obeys the Maxwell Boltzmann distribution of speeds at temperature T. If u2> u1, the ratio of the number of molecules at speed u2 to the number at speed u1 a) is always less than one. b) is always greater than one. c) can be either...
Saturday, May 10, 2014 at 10:20am

(1-13) Chemistry - Science
Which of the following effects will make the ratio (PV) / (nRT) less than 1 for a real gas? a) The gas molecules are large enough to occupy a substantial amount of space. b) A large number of molecules have speeds greater than the average speed. c) The gas molecules have a ...
Saturday, May 10, 2014 at 10:19am

1-12. Chemistry - Science
At STP, 3.0 L of D2 reacts completely with 3.0 L of E, producing 1.5 L of a product. What is the formula of the product?
Saturday, May 10, 2014 at 10:17am

(1-11) Chemistry - Science (Dr. Bob222)
Liquid chloroform (CHCl3) is placed in a closed container and allowed to equilibrate with chloroform vapor. With the temperature held constant, additional chloroform is introduced into the system, and the vapor-liquid equilibrium is reestablished. Following this, the ...
Saturday, May 10, 2014 at 8:12am

chemistry
The vapour density of a gas is 22.4 and mass is. 22.4grams.what is the volume occupied the gas at N .T .P ?
Friday, May 9, 2014 at 4:56pm

Science, Chemistry
Hess's law ____. A) makes it possible to calculate ΔH for complicated chemical reactions B) states that when you reverse a chemical equation, the sign of ΔH does not change. C) determines the way a calorimeter works D) describes the vaporization of solids Highly ...
Friday, May 9, 2014 at 3:44pm

Chemistry
The pH of a .200M HBrO solution is 4.67. What is the acids Ka?
Friday, May 9, 2014 at 11:14am

Chemistry
What would be the freezing and boiling points of a solution prepared by dissolving 1.00g of benzoic acid (C6H5CO2H) in 10.0g of benzene?
Friday, May 9, 2014 at 8:07am

chemistry
What would be the freezing and boiling points of a solution of 5.00g of sodium chloride dissolved in 25.0g of water?
Friday, May 9, 2014 at 8:07am

chemistry
20 mL of 0.125 M potassium iodide solution is mixed with 10 mL of 0.1 g L–1 sodium thiosulfate solution and 0.2 g of solid iodine indicator is added. To this solution is added 20 mL of 0.025 M peroxodisulfate solution. After 46 seconds a blue colour appears, indicating ...
Friday, May 9, 2014 at 6:03am

chemistry
hydrogen may not be advantagous as a fuel because
Friday, May 9, 2014 at 1:14am

CHEMISTRY HELP !!!! CHECK !!!
Al3+ is reduced to Al(s) at an electrode. If a current of 2.75 ampere is passed for 36 hours, what mass of aluminum is deposited at the electrode? Assume 100% current efficiency. a. 9.2 x 10–3 g b. 3.3 x 101 g c. 9.9 x 101 g d. 1.0 x 102 g e. 3.0 x 102 g Answer 2.75 A for...
Thursday, May 8, 2014 at 11:54pm

CHEMISTRY HELP ! Check Please!
Calculate the cell potential, at 25 C, based upon the overall reaction Zn2+(aq) + 2 Fe2+(aq) -> Zn(s) + 2 Fe3+(aq) if [Zn2+] = 1.50 x 10-4 M, [Fe3+] = 0.0200 M, and [Fe2+] = 0.0100 M. The standard reduction potentials are as follows: Zn2+(aq) + 2 e– --> Zn(s) E&#...
Thursday, May 8, 2014 at 11:30pm

chemistry
If 80.6 pounds of alcohol are mixed with 42.7 pounds of water, what is the percent of water (by weight) in the mixture? Answer in units of %
Thursday, May 8, 2014 at 11:03pm

chemistry
If 59.4 pounds of alcohol are mixed with 28.3 pounds of water, what is the percent alcohol (by weight) in the mixture? Answer in units of %
Thursday, May 8, 2014 at 11:02pm

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