# Posts by joseph

Total # Posts: 587

CHEMISTRY
The first-order reaction, SO2Cl2 ¨ SO2 + Cl2, has a rate constant equal to 2.20 ~ 10-5 s-1 at 593 K. What percentage of the initial amount of SO2Cl2 will remain after 6.00 hours?

chemistry
The first-order reaction, SO2Cl2 ¨ SO2 + Cl2, has a rate constant equal to 2.20 ~ 10-5 s-1 at 593 K. What percentage of the initial amount of SO2Cl2 will remain after 6.00 hours?

chemistry
decomposition of H2O2 to water and O2

chemistry
why is temperature of H2O2 measured in the graduated cylinder?

Math

Math Word Problem
The question is poorly worded. But that is the way I got the answer.

science
Balancing redox reactions Balance in acid solution 1. PH3+ I2 -> H3PO4 + I- 2. ClO3- + Cl- -> Cl2 Balance in basic solution Se -> Se2- + SeO3^2- BrO- + Cr(OH)4^- -> Br- + CrO4^2-

science
I need help with balancing redox reactions Balance in acid solution: 1) PH3+ I2 --> H3PO4+ I- 2) ClO3- + Cl- --> Cl2

phys
“There are many social and cultural contexts you interact with that strongly influence development. These contexts include people you interact with daily, neighborhood factors, and larger scale social and cultural variables. In order to fully understand how the ...

science
Balance in acid solution PH3+ I2-> H3PO4+ I-

chemistry
write the net ionic equation for the following : 2CuCl(aq)-> CuCl2(aq)+ Cu(s) 4NaCl(aq)+2H2SO4(aq)+MnO2(s)-> 2Na2SO4(aq)+2H2O(l)+Cl2(g) 3KOH(aq)+Fe(NO3)3(aq)->Fe(OH)3(s)+ 3KNO3(aq)

Science
ok, i got them. just want to make sure the answer are correct. thanks

Science
Give the conjugate acid of the following bases: a) NH2-, b) CO3 ^2-, c) HS-, d) OH-

Science
Is it O2(S) is denser right? Because it's solid

Science
thanks, i typed it wrong

Science
The normal melting and boiling point of O2 are -218C and 49.8atm. a)Sketch the phase diagram for O2. b) Which is denser, O2(S) or O2 (l)? explain.

science
Could I use STP( 760 torr and 273K) to plug in the equation ?

science
The equation require 2 pressure but there is only 1 in this problem

science
On top of one of the peaks in Rocky Mountain National Park the pressure of the atmosphere is 500.torr. Determine the boiling point of water at this location. The heat of vaporization of water is 40.7 kJ/mol? Show work for me please! Thank you

science
which would have a lower melting point, C3H6 or CH30H? explain please!

science
NH2-,NH3, and NH4+ have H-N-H bond angles of 105, 107, and 109. Explain this variation in bond angles

science
NH2-, NH3, and NH4+ have H-N-H bond angles of 105, 107 and 109. Explain this variation in bond angles.

science
which would have a lower melting point, C3H6 or CH30H? explain.

Science
Consider the following reaction: 2Na + Cl2  2NaCl ΔH = -821.8 kJ (a) Is the reaction exothermic or endothermic? (b) Calculate the amount of heat transferred when 5.6 g of Na reacts at constant pressure. (c) How many grams of NaCl are produced during an enthalpy ...

chemistry
I don't get which one is Tfinal, and Tinitial for both of them can you explain it? thank you

chemistry
A small “coffee cup” calorimeter contains 110. g of H2O at 22.0°C. A 100. g sample of lead is heated to 90.0°C and then placed in the water. The contents of the calorimeter come to a temperature of 23.9°C What is the specific heat of lead?

Chemistry
A gaseous mixture of O2, H2, and N2 has a total pressure of 1.50 atm and contains 8.20 g of each gas. Find the partial pressure of each gas in the mixture They don't give you Volume and Temperature. Please explain it to me, thank you!

chemistry
Sterling silver, an alloy of silver and copper, contains 7.5 percent copper by mass and has a density of 10.3 g/cm3. How many copper atoms are in a sterling silver sphere whose radius is 2.0 in?

chemistry
Calculate the molarity of the solution produced by mixing (a) 50.0 ml of 0.200 M NaCl and 100.0 ml of 0.100 M NaCl;

Chemistry
how many hours are in a day? 12! So... just take the 6 as the numerator and the 12 as the denominator (6/12) and if you simplify so it will be (1/2) and if you turn that into s percentage it will be %50. THE ANSWER IS AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAaa

math
what is 15% of 35?

english
write a pargraph of about 50 words on the topic job seeking is a task that needs courage as well as patience

chemistry
find the mass of solute needed. 3.0 liters of 2.0 M NaOH. or 500ml of 1.5 M NaCl?

Grade 12 English - College Assignment
job seeking and courage

cos x sin x

stats
A statistics practitioner formulated the following hypothesis: H0 : ì = 200 against H1 : ì < 200 and learned that x = 190 n = 9 and ó = 50. The p– value of the test is (1) 0.6 (2) 0.2743 (3) 0.7743 (4) −0.2743 (5) Cannot be found with ...

stats
A bakery stated that the average number of breads sold daily is 3000. An employee thinks that the actual value might differ from this and wants to test this statement. The correct hypotheses are: (I think it is 1) (1) H0 : ¦Ì = 3000 H1 : ¦Ì not= ...

stats
A statistics practitioner wishes to test the following hypothesis: H0 : ì = 600 against H1 : ì < 600 A sample of 50 observations yielded the statistics: mean x = 585 and standard deviation sx = 45. The test statistic of a test to determine whether there is ...

ciopanam

calculus
D) would actually be approximately 9.23 seconds. 1362/16=85.125

Math209
Selling shirts. If a vendor charges p dollars each forrugby shirts, then he expects to sell 2000 - 100p shirts ata tournament. a) Find a polynomial R(p) that represents the total revenuewhen the shirts are p dollars each. b) Find R(5), R(10), and R(20). c) Use a bar graph to ...

maths
The plane is flying at an altitude of 8 miles and is 175 miles from the runway, as measured from the ground. What angle will the plane's path make with the runway? Round your answer to the nearest hundredth.

Physics
Hi, I have the following question: 1. The index of refraction for a prism is given by the equation: n = 1.58 − (6.41 x 10^4)λ where λ is the wavelength in meters. Light is incident at 28°. Find the exit angle ß for light of a) 800 nm b) 633 nm c) 540 ...

accounting
What is the Journal Entry for: Sold goods to Smithsons for \$700 that costs \$300. Terms of n/30 were offered. As a courtesy to Smithsons, \$125 of frieght was added to the invoice for which cash was paid directly to the UPS by Opals, INC? Need This answer ASAP!

Physics
The typical resistance of the tungsten filament of a 60 watt incandescent light bulb when it is turned off is 24 ohms and its resistance when operating from a 120 volt power source is 240 ohms. Generally, an incandescent light bulb filament is most likely to “burn out&#...

Math 116 algebra
plug in the x values in the equation to find the y values.

Physics
No, this is all of the information that is provided.

Physics
The nominal resistance R of the resistor used in this experiment was printed on the resistor by the manufacturer. According to the manufacturer, the actual resistance of the resistor should not differ from its nominal value by more than 1%. Does your most accurate measured ...

Physics

math
use a calculator!

chem
Benzaldehyde, C6H5CHO}, has a normal boiling point of 179.0 C and a critical point at 422 C and 45.9 atm. Using a phase diagram, estimate its vapor pressure at 125 Degrees (I'm putting this back up again. Since I still didn't understand it but the answer to it was 171 ...

chem
Heat of vap. is 38.9 KJ/mol

chem
How much heat is required to raise the temperature of 200 g CH3OH from 20 to 30 degrees and then vaporize it at 30 degrees. The molar heat capacity of CH3OH is 81.1 J/Mol/K. Okay...the answer is approximately around 254. It was a homework problem. The question is how do you ...

Chemistry
thank you very much. my chemistry is very rusty so i need a refresher.

Chemistry
1.) A vapor volume of 1.17 L forms when a sample of liquid CH3CN absorbs 1.00 KJ of heat at its normal boiling point (81.1 C and 1 atm). What is the heat of vaporization in KJ per moles of CH3CN? 2.) The vapor pressure of water at 25 C is 23.76 torr. If a 1.25 g sample of H20 ...

chemistry
How much heat is required to raise the temperature of 200 g CH3OH from 20 to 30 degrees and then vaporize it at 30 degrees. The molar heat capacity of CH3OH is 81.1 J/Mol/K. Okay...the answer is approximately around 254. It was a homework problem. The question is how do you ...

chemistry
Btw what do I do about the molar heat capacity

chemistry
hm...I don't remember posting this problem but thank you again dr.bob, I can definetly always count on you

chemistry
How much heat is required to raise the temperature of 200 g CH3OH from 20 to 30 degrees and then vaporize it at 30 degrees. The molar heat capacity of CH3OH is 81.1 J/Mol/K. Okay...the answer is approximately around 254. It was a homework problem. The question is how do you ...

chem
The normal melting point of copper is 1357 K and heat of fusion of Cu is 13.05 KJ. How much heat, in kilojoules, is evolved when a 3.70 kg sample of of molten Cu freezes?

Chem.
nevermind i had it right the whole time. thank you

Chem.
Benzene has a heat of vaporization of 30.72 kj/mol and a normal boiling point of 80.1 degrees celcius. At what temperature does Benzene boil when the external pressure is 440 torr? Since...I didn't get the right answer. I'll just show my work and see if anyone can help...

Chem.
nevermind. i got it. thank you dr. bob for showing me how to do it tho

Chem.
I solved it and got 42.94 torr, so by 2 sig figs i rounded it up to 43 torr. What did you get?

Chem.
Ethanol has a heat of vaporization of 38.56 KJ/Mol. And a normal boiling point of 78.4 degrees celcius. WHAT is the vapor pressure of ethanol at 18 degrees celcius?? Okay...I don't really get out to solve for it actually. ln (P2/760 torr)= -38560/8.3145 * (1/291.15 - 1/351...

Chem.
Benzene has a heat of vaporization of 30.72 kj/mol and a normal boiling point of 80.1 degrees celcius. At what temperature does Benzene boil when the external pressure is 440 torr?

Chem.
Thanks. But I'm still getting it wrong, cause maybe the sig figs are off by a little. What did you get for this problem?

Chem.
Ethanol has a heat of vaporization of 38.56 KJ/Mol. And a normal boiling point of 78.4 degrees celcius. WHAT is the vapor pressure of ethanol at 18 degrees celcius??

Computer Science
Haha yeah thanks i already figured it out. thank you tho

Computer Science
I tried the / but that didn't worked either =[

Computer Science
This is the problem: The following HTML code fragment contains a reference to an image file called frog.gif and with alternate text set to froggy, but the code as written contains a number of errors. Write the HTML line correctly. <IMG SCR=frog.gif ALT=froggy> (Note: ...

Literary Analysis and Composition
Are you sure this is a solid b+

math
pentagon

math
what do you call a closed figure made up of line segments?

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childcare

math
Sandra has eight coins witch total \$0.87. what coins does she have (Hint:make a chart or a list)

Essay
There are so many different tips and hints available online. Why don't you google? As well, you can check how can Supreme essay guys help you. They are real professionals in what they do. Give them a try. Best of luck!

how do i find antony for words in my weglish class.

math
write each decimal as a percent and as a fraction in the lowest terms

History
Federalist

essay writing
I guess all of them are important in some way. I would rather choose A. I don't think you still need help with it, anyway. That's why I would recommend you to contact Supreme essay service. Those guys are real professionals in what they do. So you can definitely give ...

gOVERNMENT
marbury vs madison mcculloch vs Maryland dred scott decision plessy vs ferguson brown vs board of education roe vs wade bowers vs hardwick mapp vs ohio bakke decisioN What amendments are these linked to and rights related to.

Science
how to find length volume and mass

essay writing
I can agree with Ms.Sue those three elements are really important. You can find an outline. rules for rewriting and some tips for writing an effective thesis statement available on the net. In case you would need some professional help, I would recommend you to contact Supreme...

sports puzzle
I have puzzle to solve on words from the world of sports.Do you know any web or side that can help .

algebra
What is the set of numbers belonging to an absolute number

Finance
Write a 200- to 300-word description of the four time value of money concepts: present value, present value of an annuity, future value, and future value of annuity. Describe the characteristics of each concept and give an example of when each would be used

biology
What is the outer edge of a cheek cell called? please urgent homework due tommorow

Literature (short story)
11. Twain's account of Colonel Rall's speech ("full of gunpowder and glory") is contrasted most vividly to the Marion Ranger's collective remorse over A. the strange affair at "Camp Desolation." B. the shooting of an unarmed rider. C. rebuffing ...

Essay Outline
Check how can Supreme essay guys help you. Those guys are real professionals in what they do. Introduction: Usually an introduction starts broad and narrows down to your specific topic, ending in the thesis. This is your opportunity to establish why readers might be curious ...

math
1) A gardener wants to plant flowers 10 feet form the base of a flag pole. When he has completed the task, describe in detail what geometric shape the planted flowers will form? 2) Describe the locus of points 5 units from the line whose equation is y=3 on a coordinate graph. ...

milkweed jerry spinelli what dop you think the fox-face furs with beady black eyes symbolize?

reding
milkweed jerry spinelli what do you think the black horse on the merry-go-round might have symbolized?

jerry spinelli milkweed what is the dramatic irony in the scene when misha accompanies janina`s family on their way to the ghetto? what is the effect of this device?

chemistry
CH=78g/mol but the relative atomic mass of C=12 and H=1 therefore the molecular mass would be (12+1)n=78 g/mol 13n = 78 g/mol n=6 the molecular formula is C6H6 .

algebra
Under what situation would one or more solutions of a rational equation be unacceptable? Give an example.

grammar
fourthly,he went fishing with his pal. correct grammar.

English-Ms.Sue
An argumentative essay uses reasoning and evidence—not emotion—to take a definitive stand on a controversial or debatable issue. The essay explores two sides of a topic and proves why one side or position is the best.Choose a specific issue to discuss. Research both ...

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