# CHEMISTRY (WEBWORK)

1,475 results, page 2
1. ## math

If cos(3 x)6Ó14 x e^2 y=0, find [ dy/dx] using implicit differentiation. In this problem, you should differentiate both sides of this equation with respect to x. First, using implicit differentiation, differentiate the left side of the equation with
2. ## Chemistry

Assuming that the smallest measurable wavelength in an experiment is 0.330 fm(femtometers), what is the maximum mass of an object traveling at 157 m·s^–1 for which the de Broglie wavelength is observable? mass = ? kg Chemistry - DrBob222, Monday,
3. ## Chemistry

Assuming that the smallest measurable wavelength in an experiment is 0.330 fm(femtometers), what is the maximum mass of an object traveling at 157 m·s^–1 for which the de Broglie wavelength is observable? mass = ? kg Chemistry - DrBob222, Monday,
4. ## English

Hello! I will type 2 exercises from the lesson I am teaching on Wednesday-english as a foreign language - 8th graders ( it will be graded) I need you to help me with some ideas. It says: LEAD- IN: A Here is a list of some natural sciences: BIOLOGY
5. ## math

Elin estimates her probability of passing French 0.6, passing chemistry is 0.8, (a)determine the probability that elin will pass French but fail chemistry (b) pass chemistry but fail French (c) pass both classes (d)fail both classes
6. ## Chemistry(Please respond)

Calculate the pH of an aqueous solution of 0.15 M potassium carbonate. I know that pH = -log(H30+) but I am not sure how to start this problem. Chemistry(Please help) - DrBob222, Saturday, April 14, 2012 at 11:09pm Hydrolyze the CO3^2-. CO3^- + HOH ==>
7. ## chemistry

Effusion/Diffusion Chemistry Help!!! If 4.83mL of an unknown gas effuses through a hole in a plate in the same time it takes 9.23mL of Argon, Ar, to effuse through the same hole under the same conditions, what is the molecular mass of the unknown gas?
8. ## math

In a class of 50 student 28,22,20 of them offer physics,chemistry and biology respectively also,4 of them offer physics and chemistry but not biology,3 offer physic and biology but not chemistry,6 offer biology and chemistry but not physics if 13 of them

Based on the question topic posted by Britney below titled:In your opinion (your answer to this reminded me of something) (I posted the same thing there but I thought it was improper to piggyback on that post so I posted this under a new topic) I don't
10. ## CHEMISTRY

1.Chemistry Question: A 0.1 M solution of acetic acid is titrated with 0.05M solution of NaOH. What is the pH when 60% of the acid has been neutralized? The equilibrium constant (Ka) for acetic acid is 1.8x10^-5 2. Chemistry question: On average, how far
11. ## chemistry

Hi, Does anybody know any good websites that can teach me step-by-step basic chemistry (through power points) to AP chemistry? I would greatly appreciate it! Since this is not my area of expertise, I searched Google under the key words "AP chemistry
12. ## planning

Ms. Sue, you told me last time to search up my college to see what courses are required for hygienist, and so this is what I got. 2. The course choices that I make today lead to the fulfillment of this dream by them providing all the knowledge that I need
13. ## Math

First student bought art, math and history books for \$72. a+m+h=72 Second student bought art, chemistry and history books for \$80. a+c+h=80 Third student bought chemistry, math and history books for \$61. c+m+h=61 Fourth student bought art, math and
14. ## Chemistry

I need to calculate the molecular mass of ehtylene glycol based on the freezing point depression. The teacher said that for glycol i=1 and to use the equation m=delta T / Kf X i Kf = -1.86C/m so I did -2.5C / -1.86 X 1 = 1.344 I know that 1.344 can't be
15. ## statistics

Leslie took two midterm exams and earned the following scores: 82 on the chemistry exam (class distribution: μ = 75, σ = 6.25) and 63 on the physics exam (class distribution: μ = 59, σ = 3.57). Rounding to two decimal points, on which exam should
16. ## Chemistry

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 5.35 = 2.00^m I guess this is not correct because I do not know a whole number that will give you 5.35. Chemistry - DrBob222,
17. ## math

Emily surmises that the probability that she will pass math or chemistry is .95, the probability of her passing math is .7, and the probability of passing both is .55. Find her estimate of the probability of passing chemistry?
18. ## math

A textbook store sold a combined total of 462 biology and chemistry textbooks in a week. The number of biology textbooks sold was two times the number of chemistry textbooks sold. How many textbooks of each type were sold?
19. ## math

A textbook store sold a combined total of 315 physics and chemistry textbooks in a week. The number of physics textbooks sold was two times the number of chemistry textbooks sold. How many textbooks of each type were sold?
20. ## Chemistry - Science (Dr. Bob222)

Posted by Ana on Saturday, May 3, 2014 at 11:23am. A zinc-copper battery is constructed as follows (standard reduction potentials given below): Zn | Zn2+ (0.10 M) || Cu2+ (2.50 M) | Cu Zn2+ + 2 e- → Zn(s) Eº = -0.76 V Cu2+ + 2 e- → Cu(s) Eº = 0.34 V
21. ## Chemistry

Which aqueous solution below is expected to have the lowest freezing point? Assume 100% dissociation for ionic species. 1)0.25m MgBr2 2)0.30m Na2SO4 3) 0.50m KCl 4) 1.0m sucrose 5) 0.40m Cr(NO3)3 I think that the answer is 0.30NaSO4 but I am not positive.
22. ## Science

How does the silly putty made up of glue gel differ from the silly putty made of soap in terms of texture ? How would the touch be different and why? Chemical structure? .....? Science:Chemistry - bobpursley, Friday, February 21, 2014 at 9:53pm Have you
23. ## Chemistry

Hi you guys please help me with my chemistry homework, i need to find all these items and take them to my class in a ziploc bag *a hydrocarbon with a molecular mass greater than 100g/mol *2 porpanol *an aromatic compound(not the common usage of "aromatic"
24. ## math

In a class of 80 students,53 study Art,60 study biology,36 study art and biology,34 study art and chemistry,6 study biology and 18 study biology but not chemistry.Determine the number of students who study =Art only =Chemistry only
25. ## physics

doing webwork when i came across this question. sure i had it right but apparently im not. The weightless horizontal bar in the figure below is in equilibrium. Scale B reads 4.20 kg (N.B. as you know, the scale should read N, but no one told the
26. ## DrBob222

I know I posted this but you didn't answer! Please help!!!! Consider the following reaction at 298 K: C(graphite) +2Cl2 (g) -----> CCl4(l) Calculate the following quantities. Delta H: -139 kJ/mol deltaS(sys)=? J/mol*K deltaS(surr)=? J/mol*K deltaS(univ)=?
27. ## Chemistry

Can someone please help me on this two Chemistry questions...they are from my lab....the lab was on Acids and Bases using Red Cabbage Indicator. Q1- How consistent was the cabbage juice indicator for this lab? Discuss the limitations of using red cabbage
28. ## chemistry

I am enrolled in analytical chemistry after a 4 year break from any chemistry. I was recently given a problem set and I need some help on the following: A 0.899g sample containing epsom salt, MgSO4 & 7 H2O, and other non-hydrated materials was dehydrated
29. ## MATHS

in a class of 60 students,the number of students who pass biology is 6 more than the number who pass chemistry.every student passed at least one of the two subject.how many pass in only biology.how many pass in only chemistry.

Please can you give me what are the products , the colour of the flame, how does it react when : 1- Zinc reacting with oxygen Zinc reacting with air 2- Iron filings with oxygen Iron filings with air 3- Copper reacting with oxygen Copper reacting with air
31. ## chemistry

I'm sorry, but this is a re-post. I couldn't find the original post;-( so, does anyone have any suggestions for helping a student make a passing grade in college chemistry? She took it twice and didn't pass. Any suggestions would be appreciated. I thought
32. ## chemistry

how many grams of sodium carbonate are needed to prepare 0.250 L of an 0.100 M aqueous solution of sodium ions? well normally you go moles=grams/molar mass than M= moles/L but when looking for grams? what do you do........multiple .250 by .100 than divide
33. ## Chem

if the pressure was increased in this reaction : 2NO(g)+ O2 =====> 2NO2
34. ## Chemistry

Fluorine reacts with oxygen to yield oxygen difluoride. 2 F2(g) + O2(g) 2 OF2(g) What is the value of K if the following concentrations are found at equilibrium: [O2]= 0.200 mol/L, [F2]=0.0100 mol/L, and [OF2]=0.0633 mol/L Chemistry - DrBob222, Thursday,
35. ## MARKETING

Mr. Pennymarch, the advertising manager for Chemistry Today magazine, is responsible for selling advertising space in the magazine. The magazine deals primarily with chemical processing technology and is distributed solely by subscription. Major
36. ## science

What are 3 chemical properties of iron and 2 chemical properties of sodium? http://chemistry.allinfoabout.com/periodic/fe.html http://chemistry.allinfoabout.com/periodic/na.html Thanks. That helped a little.
37. ## chemistry

Using this data, 2 NO(g) + Cl2(g) == 2 NOCl(g) Kc = 3.20 X 10-3 NO2(g) == NO(g) + ½ O2(g) Kc = 3.93 calculate a value for Kc for the reaction, NOCl (g) + ½ O2 (g) == NO2 (g) + ½ Cl2 (g) A. 20.2 B. 2.06 X 10-4 C. 4.49 D. 4.84 X 10-3 E. 0.223 eliminated
38. ## chemistry

Using this data, 2 NO(g) + Cl2(g) == 2 NOCl(g) Kc = 3.20 X 10-3 NO2(g) == NO(g) + ½ O2(g) Kc = 3.93 calculate a value for Kc for the reaction, NOCl (g) + ½ O2 (g) == NO2 (g) + ½ Cl2 (g) A. 20.2 B. 2.06 X 10-4 C. 4.49 D. 4.84 X 10-3 E. 0.223 eliminated
39. ## Chemistry

Hi! I'm in chem class and I don't know the answer to these questions I have several metal alloys and have to tell their general elements that make them up for example bronze - copper and tin What is the elements that make up Pewter? Also I was woundering
40. ## Chemistry

Find the value of delta H net for the following equation: SnBr2(s) + TiCl4(l) -> TiBr2(s) + SnCl4(l) I know that I already posted this once but I am still lost on what to do. I know that TiCl4=-804.2 and SnCl4=-511.3 but I thought that the values for SnBr2
41. ## algebra

in a class of 30 students , there are 22 students who study chemistry but not physics, 4 who study physics but not chemistry and who study neighter chemistry nor physics. how many students in the class study physics
42. ## Chemistry

If you add 0.35grams NaF to 150mL of a 0.30M HF, what is the pH of the resulting solution? To start off would I use the value of 1.4e-11 for F^-^ and 7.2e-4 for HF? Chemistry(Please help) - DrBob222, Tuesday, April 10, 2012 at 12:04am This is a buffer
43. ## Chemistry

1. Imagine that you work at a company that prepares chemical solutions. You are asked to label a solution to sell to different customers. One customer is a hospital, another is a chemistry lab at a university, and a third is a physics lab at a university.
44. ## chemistry

Carbon and silicon are both in Group 14 of the periodic table. (i) Identify compounds which illustrate similarities in the chemistry of carbon and silicon. (ii)Identify compounds which illustrate significant differences in the chemistry of carbon and
45. ## Chemistry

Convert a pressure of 23.8 in. Hg into kilopascal. Ok so I looked up kilopascal and it Said 1 Kpa = 1000 pa So I began to set it up like this 23.8 / 29.2 x1000 am I correct Chemistry - DrBob222, Thursday, October 13, 2011 at 1:48pm I don't think that will

delta Go = -431.16kJ/mol - (298k X 0.12529 kJ/K*mol) I am having trouble converting the units for delta H and delta s to match. I multiplied delta H by 1000 to get kJ but this didn't give me the correct answer. Chemistry(Please help) - Dev, Wednesday,

I have to calculate the concentration of I2 produced (# of moles of I2 produced / L) based on the stoichiometric ratio in the following equation. 2S2O3^2- + I2 -> 2I^- + S4O6^2- Chemistry(Urgent, please help) - DrBob222, Sunday, February 26, 2012 at 9:47pm
48. ## Organic chemistry: dehydrohalogenation

Hello. I know you guys don't do organic chemistry but because I got so much help from you guys in general chemistry, I was wondering if you guys can help me out again. :P Here's my question. In dehydrohalogenation, how do you know whether a reaction is E1
49. ## Chemistry

The energies, E, for the first few states of an unknown element are shown here in arbitrary units. n 1 E -11 n 2 E -5 n 3 E -2 n 4 E -1 n ... E ... n infinite E 0 A gaseous sample of this element is bombarded by photons of various energies (in these same
50. ## 11th grade

what exactly is chemistry?
51. ## MTI

what is chemistry
52. ## chem

need help on chemistry below
53. ## science

chemistry help
54. ## chemistry

in chemistry what is aq

chemistry
56. ## SCIENCE

WHAT IS MEAN OF CHEMISTRY?
57. ## chemistry

Where can I find the answers to these questions in my text, "fundamentals of analytical chemistry" by skoog, west, holler and crouch. 1. Why is acetylsalicylic acid analyzed using back titration? 2. Discuss the importance of simmering the tablet in the
58. ## Chemistry

1. How could a chemistry student change NaOH(s) to NaOH(aq)? s= solid aq= aqueous 2.) How could a chemistry student change NaOH(s) to NaOH(l) s= solid l= liquid
59. ## maths

In a class of 60 students,the number of students who passed biology is 6 more than the number who passed chemistry.Every student passed at least one of the two subjects.i.how many students passed biology ii.how many students passed chemistry iii.how many
60. ## Chemistry

Sorry, just asking a question on chemistry.
61. ## chemistry

What does a slash (/) mean in chemistry?
62. ## chemistry

why is chemistry so important
63. ## chemistry

Does Chemistry have anything to do with meteorology?
64. ## chemistry

i need help with chemistry homework
65. ## Chemistry

why is chemistry needed
66. ## Chemistry

What is another name for mole in Chemistry
67. ## Science

List all of the things that are physical property. You will find some listed here. http://nobel.scas.bcit.ca/chem0010/unit2/2.2_properties_physical.htm There are very many others, but they would require a lot of effort to explain what they mean. Isn't
68. ## chemistry

Under the appropriate conditions, NO forms NO2 and N2O: 3NO(g) N2O(g) + NO2(g) Use the values for delta G naught for the following reactions to calculate the value of Kp for the above reaction at 500.0 C 2NO(g) + O2(g) 2NO(g) delta g=-69.7 kJ 2N2O(g)
69. ## Chem

A carless chemistry student pours 200 grams of methanol, a flammable substance into the sink. Another careless chemistry student causes the bad situation to get even worse by dropping a lit match into the sink. The metanol burns completely with 300 grams
70. ## Biology

Why do you you need to perform dilution(s)in chemistry?
71. ## physics

What model is the basis for chemistry?
72. ## previous chemistry.

can some one reply to my last chemistry post? thanks.
73. ## Drbob222

Can you please help me with some questions I have on my Chemistry lab?
74. ## AP CHEMISTRY

Someone please answer my question below in AP CHEMISTRY.
75. ## unt

chemistry ---- 77=25 to the x power. Can anyone assist.

Can someone please help with the chemistry problems? I need them to study.
77. ## PLZ look at Chemistry Questions!!!

No chemistry questions are getting answered =(
78. ## chemistry

Abstract 4 chemistry of starch
79. ## chemistry

Chemistry Suspension Examples...
80. ## chemistry

Chemistry Suspension Examples...]
81. ## science

write aout chemistry
82. ## Chemistry

What is weighted average in chemistry?
83. ## Research paper topics

I NEED TOPICS AVOUT CHEMISTRY !
84. ## CHEMISTRY

WHAT RELATION DOES CHEMISTRY HAVE TO ART?
85. ## Chemistry

Road map in chemistry ?
86. ## chemistry

what topics are under periodic chemistry?
87. ## chemistry

which topics are under periodic chemistry II?
88. ## Chemistry

What are the parts of a calorimeter used in chemistry?
89. ## DrBob222

I really need help on these chemistry problems. Can you please help me work them. Please?
90. ## Geography

What is the relation between geography and chemistry
91. ## Chemistry

In which direction will the net reaction proceed X(g)+Y(g)Z(g) Kp=1.00 at 300k for each of these sets of initial conditions? a) [X]=[Y]=[Z]=1.0 m net reaction goes to the left net reaction goes to the right reaction is at equilibrium I chose 3 for a. b)
92. ## Chemistry

At what initial concentration would a solution of acetic acid (ka=1.8x10^-5) be 2% ionized? Thanks Responses Chemistry - DrBob222, Thursday, February 12, 2009 at 10:00pm Let's call acetic acid HAc. Then the ionization is HAc ==> H^+ + Ac^- We will call the
93. ## Chemistry

Thank you for your help. I did want to clarify why you are only calculating the Molar Mass for H2 and not the molar mass for H2O (or even H2O2). I'm not sure why you did this. Please clarify. See below: The following reaction represents the decomposition
94. ## ap chemistry

WHERE CAN I TAKE AP CHEMISTRY ONLINE DIAGNOSTIC TEST?
95. ## AP chem

is there anyway that i could also get help with the chemistry problem that eric posted?
96. ## 11th grade

how do you solve a dilution problem, this is chemistry
97. ## chemistry

what is chromatography? Its history,purpose in chemistry.
98. ## Chemistry lab

List 10 equipment use in the chemistry lab and their uses
99. ## biology

how does concepts of chemistry affect biology?
100. ## Chemistry

Why would a firefighter or a reporter need to understand chemistry?