chemistry! URGENT

59,905 results, page 22


What is another name for mole in Chemistry


What does a slash (/) mean in chemistry?

Biology URGENT!!!!

I need to know if flagella are on plant or animal cells. I need to know the same for cilia. THIS IS DO TOMMOROW!! Thank you go to google and type in flagella and cilia


I'm doing a Chemistry project on the element Potassium. I need some sort of color theme to apply to my project because creativity counts. Does anyone have suggestions?


What effect would a sweaty person have on the pool chemistry? Would the reaction tend to be forced to the right or to the left? Any help is greatly appreciated!


My question is I need to change to symbol on sodium ion, \rm Na^+, followed by the formula of a sulfate ion, \rm SO_4{}^{2-} Its my first time in chemistry class.

Math Help 2 Questions Urgent!

1. The Pythagorean Theorem can be used to find distances between two points on a grid. But what about finding distances in three-dimensional space? Consider a rectangular box, which has length l, width w, and height h. What is the distance from one corner to the opposite ...

URGENT! Last calculus question!

Hey! So, I was wondering if someone could answer this. I am mad studying for my exam and I still have a few questions left that I just don't have time to answer, and the assignment is due tomorrow. Thanks and here is the question: Use calculus and algebraic methods to do a ...

Chemistry A.P.

Hi there, I need some help with my homework problem for chemistry, What is the balanced thermochemical equation for glucose (C6H12O6) and O2 gas form CO2 gas and liquid water?


What is the chemistry behind caffeine extraction with Na2SO4, CH2CL2 and NaCO3. I know that Na2SO4 some how aborbs the water from a solution leaving the undissolved soilds or something...


In studying the chemistry and qualitative analysis of anions, why wouldn't HCl be a good acid to use to determine the solubility of a silver precipitate in acid solution?

Chemistry Help Please!!

What effect would a sweaty person have on the pool chemistry? Would the reaction tend to be forced to the right or to the left? Any help is greatly appreciated!


At 1 atm, how much energy is required to heat 67.0 g of H2O(s) at –14.0 °C to H2O(g) at 115.0 °C? Please explain, I'm not very good at Chemistry and this problem is giving me a headache. Thank you!


List three advantages and three disadvantages of improvised apparatus in teaching 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 is a molecule of air ...


Calculate the standard free-energy change for the following reaction at 25 C degrees. 2Au^3+(aq)+3Ni(s) <-- --> 2Au(s)+3Ni^2+(aq) Ni2+(aq) + 2e- -> Ni(s) E=-0.26 Au3+(aq) + 3e- -> Au(s) E=+1.498 G= ? KJ Would it be G=1.758? •Chemistry - DrBob222, Sunday, March 31...


1. Chemistry is the study of the composition, structure and properties of substances.- F? 21. Which is found in the nucleus-- Protons or neutrons? 27. Copper metal is: a. poor conductors b. brittle c. malleable C? 44. What is the charge on most polyatomic ions? - Negative ...


what number should be placed in the blank to balance the equation C 3 H 8 + 50 2 --> 3 CO 2 ___ H 2 O I have been working on this Q for four hours and it is driving me CRAZY please HELP i hate chemistry or anything with numbers in it as a matter of fact.

Physics (URGENT!)

-vehicle 1: 2,060lbs -vehicle 2: 5,800lbs -both roads are 45mph -The cars were impacted at right angles -roadway was dry, 69 degrees -friction between tire & road: .60=mu -skid marks (PRIOR to impact): v1=20ft, v2=7ft. *you can find the entire problem w/ more info online if ...


can someone explain the leveling effect in chemistry or provide a good link please? in my chem book it says something like HNO3<H2SO4<HCl<HBr<HI<HClO4 but i don't get why they are greater/smaller


This is for grade 11 chemistry, balancing equations. Help asap? I'd like to get it done by tonight, if possible. Type of reaction: Predict product in words: Write Balance equation: Heres the question. Aluminum+ Zinc Sulfide =


(1) The inputs for cellular respiration are: A) Nutrients and carbon dioxide B) Energy and carbon dioxide C) Nutrients and oxygen D) Energy and oxygen ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ My Answer: B ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ (2) The outputs for cellular respiration are A) ...


Could you please check these few sentences? Thank you. It's urgent! 1) Though you are not a qualified Spanish teacher, I'll be happy to have conversation classes with you during my stay in Madrid. 2) I hope we can meet around 5 p.m. every day starting from 5 August. 3) I would...


The Houston Rockets and San Antonio Spurs will play a "best two out of three" series. Assume that Houston has a probability of 1/3 of winning any game. a. Draw a probability tree showing possible outcomes of the series. Label the branches with appropriate probabilities. b. ...


The Houston Rockets and San Antonio Spurs will play a "best two out of three" series. Assume that Houston has a probability of 1/3 of winning any game. a. Draw a probability tree showing possible outcomes of the series. Label the branches with appropriate probabilities. b. ...

Physics URGENT!!!

Gayle runs at a speed of 9.00 m/s and dives on a sled, initially at rest on the top of a frictionless, snow-covered hill, that has a vertical drop of 20.0 m. After she has descended a vertical distance of 4.00 m, her brother, who is initially at rest, hops on her back, and ...


IS THERE ANY MUSIC TEACHERS THAT CAN HELP ME PLEAS??? ITS REALLY URGENT yes do you know what singing points are please? Ok, try this. A point can be defined as the subject of a fugue. In the piece you're analyzing, is there a part that more than one voice sings? For instance, ...

Science, very urgent please help

An experiment is set up to test whether a particular insect prefer a dark or a bright environment. A chamber with a gradient in light intensity from one end (dark) to the other (bright) has been made. The experimental hypothesis is: “There will be a large difference between ...

science very urgent need help

An experiment is set up to test whether a particular insect prefer a dark or a bright environment. A chamber with a gradient in light intensity from one end (dark) to the other (bright) has been made. The experimental hypothesis is: “There will be a large difference between ...


it is about the system R or R programme. Can anyone help me about the question? Urgent! Let X denote the concentration of calcium carbonate (CaCO3) in milligrams per liter. Following are 20 observations of X: 130.8 129.9 131.5 131.2 129.5 132.7 131.5 127.8 133.7 132.2 134.8 ...

General Chemistry Project Ideas?

Hi I'm a high school science teacher and I teach General Chemistry when we learn how chemistry relates to our everyday lives. Right now were learning about some common compounds. I need projects ideas regarding some common compounds relating to their everyday lives.


Chemistry - Danielle , Wednesday, February 11, 2009 at 7:24pm The density of a 22.0% by mass ethylene glycol (C2H6O2) solution in water is 1.03 g/mL. Find the molarity of the solution. Answer in M

Dr.Bob - Question

I'm know I'm interested in the chemistry field. The problem is that I have to further narrow down my field of interest. I was curious to know what type of chemistry did you specialize in in the past. -christina

Chemistry-Dr. Bob

Please help me in any way to relate the concepts of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. I appreciate any direction or info you could provide, Dr. Bob Thank you

chemistry ............chemistry

if you had to design a firework show for a Christmas celebration , what elements would you include in the fireworks ? why ? I knew u post answer for me , but i can't find it . May you answer for me? Thank you so much !!

physical chemistry

This question is about a lab called Heats of Ionic Reaction in my Physical Chemistry class. I need to know why there should be a large percentage error in deltaH4


Can someone please tell me what to expect from Beginner High School chemistry? Is it mostly applying mathematics like physics? Or basically memorizing like biology? Thank you!


Where can i find the quanity measured by each of of the seven SI base units and the SI symbol of the unit. Here: thanks

Math [urgent]

1. The sum of three numbers is 301. The second number is 3 less than twelve times the first number. The third number is 4 more than seven times the number. Find the three numbers. ~~~~~~ 2. Two friends live 15 miles apart. One day they decide to jog and meet each other. Tanya ...

In-class presentation URGENT history

Hi Look, I'm stuck. I've been trying to get an idea all week. The last thing that I want to do is use a powerpoint as my visual aid. In fact i've removed it from even being considered. At one point I thought about doing a video confrence or asking people-on-the-street what ...


Please check my answers if it is correct.thanks a lot.GOD BLESS U ALWAYS. •Being independent – not dependent Independent can stay and live alone without anybody’s help. Can be able to survive for whatever things occurred whether bad or good. •Being decisive – not ...


What is the hydrogen ion concentration, in mol dm−3, when 2.00 g of sulfuric acid is dissolved in water to give 0.400 dm3 of solution? could you explain in a simple and clear way please because im not very good at chemistry. thanks in advance

Microeconomics help please (urgent)

I just want an idea on how to do this, so will only post one example: For each of the following situations, decide whether the bundle Lakshani is thinking about consuming is optimal or not. If it is not optimal, how could Lakshani improve her overall level of utility? That is...

AP Chemistry

What is meant by minimum and maximum energy problems. Are there different equations to find them. What does this conceptually mean? * This is dealing with quantum chemistry such as plancks equation, and debroglie equation.


There is a ball with a mass of 1000 lbs. It's turned into wire with a diameter of 3.12 x 10^-1 How long is the wire? This is my crazy chemistry teacher's idea of a test...and I don't even think there's a solution. HELP ME


What volume would be occupied at 0°C and 1 atm by 3 mol CO₂(g)? I just might need someone to help me work this out, I would greatly appreciate it! I don't understand this chemistry problem.


Moles chemistry? Calculate the mass of solute required to prepare ib the solution 200cm^3 of solution containig 0.50 mol dm ^-3 cl-iond prepared by dissolving cacl2.6h2o in water.

physics- vry urgent

A human wave. During sporting events within large, densely packed stadiums, spectators will send a wave (or pulse) around the stadium (Fig. below). As the wave reaches a group of spectators, they stand with a cheer and then sit. At any instant, the width w of the wave is the ...


Name 3 careers where you are required to know PHYSICAL Chemistry, and why those careers require it.

chemistry ----------- chemistry

on the atomic level , how are physical changes and chemical changes different ?


how can different steps in the analytical process help in solving probs in Analytical Chemistry

Science! URGENT

How might sexual reproduction decrease an organisms chance of survival? A. If the offspring inherits a genetic combination that includes a harmful trait, it could decrease the organisms chance of survival. B. If the offspring inherits the exact sane genetic information as its ...


In the following sentence, which words should be in quotation marks? Did you read the chapter Chemical Reactions in our science textbook, Understanding Chemistry? A. chapter Chemical Reactions B. Chemical Reactions C. Understanding Chemistry I think the answer is B, as it is a...

Physics Urgent!

1.You are driving at the speed of 28.7 m/s (64.2138 mph) when suddenly the car in front of you (previously traveling at the same speed) brakes. Considering an average human reaction, you press the brakes 0.427 s later. Assume that the brakes on both cars are fully engaged and ...

Chem Urgent Help ?

I have a lab dis monday .. plz someone help .. Lab Title is (( Recrystallization of a Solid )) Pre-Lab Questions.... Explain the purpose of the following in this experiment. a) using hot filtration b) not cooling (chilling) the hot filtered solution immediately c) washing the ...

Choosing High School Courses

I want to major in something English or History related, probably Secondary Education, International Studies, or Journalism. I am currently enrolled in chemistry and I am doing horribly. Would colleges rather see me take chemistry and get a bad grade, or would they prefer me ...


what is suspension in chemistry? will you please give me a very long explanation about it now.....? I really need it for my project.plz?????? Write your own long explaination, and I will be happy to critique it.

Science, HELP!!! URGENT!

a) If the silty clay loam soil profile is 1 meter deep, how much plant available water (cm) can potentially be held in the upper meter of soil? b) If the silty clay loam profile is 40 inches deep, how many inches of plant available water can potentially be held in the upper 40...

CALCULUS-URGENT- no one will respond!!!

we know the series from n=0 to infinity of c(sub n)*3^n converges 1. TRUE OR FALSE the series from n=0 to infinity of c(sub n)*2^n must converge 2. TRUE OR FALSE The series from n=0 to infinity of c(sub n)*4^n must converge 3. TRUE OR FALSE the series from n=0 to infinity of c...


Calculate the pH of a potassium phosphate buffer if the pKa of KH2PO4 is 7.2 and the acid-base ratio is 2:1 I took Chemistry 7 years ago and am in a review for a Biochem course I am takin. I do not remember the basics so any help with how to get started or what equations to ...

chemistry class

i have a Chemistry lab (level 2) final exam soon. our teacher told us that we would have % transmittance problems, can someone show me an examples (maybe from an online test) or a made up one, of what i might expect to find on my chemistry lab final? like an examples of a % ...

Chemistry - URGENT

So, I go to high school in Texas and we have this AP Chem lab due online tomorrow night by midnight and I need some serious help on these questions:   Lab Temp 0.2°C   Experiment Trial Time in seconds Trial 1 Trial 2 Average Time   1 1 2 256 275 268   2 1 2 215 226 ...

Physics URGENT!!!

A luggage carousel at an airport has the form of a section of a large cone, steadily rotating about its vertical axis. Its metallic surface slopes downward toward the outside, making an angle of 21.0° with the horizontal. A 37.0 kg piece of luggage is placed on the carousel, ...

accounting please help urgent

pls.hep me to solve tjis problem.. is anyone willing to solve please. PROBLEM 1: On Jan 1, 2011, the Rhiri, Brit & Keisha partnership is formed. Rhiri and Brit contribute cash of $30,000 and $20,000 respectively, while Keisha contributes assets with the following fair values: ...

Accounting urgent

Whistle manufactures referee whistles. At the end of February, Whistle has 2,000 pounds of steel for whistles inventory. Whistle expects to produce and sell 50,000 whistles in March. Each whistle requires a standard quality of .2 lbs of steel. Whistle wants to have 5,000 ...

Accounting urgent

Ellis Co. sold merchandise to Rather Co. on account, $7,150, terms 2/15, n/30. The cost of merchandise sold is $4,290. Ellis Co. issued a credit memo for $850 for merchandise returned and later received the amount due within the discount period. The cost of the merchandise ...


Products are often marketed as "organic" or "natural". What do these terms mean when applied to consumer goods? Discuss how these terms may be used to mislead a public that is not knowledgeable in chemistry. Support your opinion with references.

organic Chemistry

In my Organic chemistry lab, the calculated enantiomeric excess was over 100% . Is this possible? and If not, what sort of error could have been made? *the observed optical rotation was read correctly

College Chemistry

This is my first time taking chemistry and I am VERY confused on the steps foe this problem! Kilocalories to condense 82g of steam at 100 degress C, cool the liquid and freeze it at 0 degress C.

chemistry ......chemistry

what does Planck mean when he states that energy in quantized? Ans: plank's theory proposes that the energies absorbed or emitted by atoms are quantized ,which means that their values are restricted to certain quantities. is this O.K?

chemistry to MathMate

Chemistry - CJ, Tuesday, March 31, 2015 at 10:53pm I am experiencing a major block.... I can't say.... 1micrometer= 1000nm 5micrometer= x..... because I'll get back the same thing So please help me, tell me the answer please.

Clarify (URGENT!!)

Create strategies and possible dialogue (min. 1 per topic) for communicating in the following situations: Saying no to sexual involvement Discussing whether or not to become sexually active Talking with a partner about using protection Discussing with a friend or parent your ...

Physics: urgent help needed

i have a test on monday 1 A beach ball is thrown straight up with a speed of 10m/s from a point 2 m above the ground a) Assuming no air reistance, calculate how far up the ball will go b)At what speed will the ball eventually hit the ground? c) If the air resistance exerts a ...

math sets

out of 320 students at a university,190 taking math,235 taking chemistry and 120 taking physics.125 are taking both chemistry and math,95 taking both chemistry AND PHYSIC,55 TAKING BOTH MATH AND PHYSICS.HOW MANY ARE TAKING ALL THE THREE SUBJECTS


Thank you for your corrections. I'm still doubtful on a few things. I did some corrections myself. Can you please tell me if they are possible? it's really urgent. 1)My name is Michele and I was born in Torino on 23 March 1997. When I was three years old, I moved with my ...

SAT Math

All of the students who took chemistry at Groveton High School last year were juniors or seniors, as shown in the table below. If 80% of the students who took chemistry passed, then what fraction of the students in the combined junior and senior classes took chemistry? Class ...


a boat moves through still wather at x kilometers(km) per hour. it travels 24km up stream against a current of 2km per hour and then returns with the current. The rate upstream is x-2 because the boat moves against the current and the rate downstream is x+2 because the boat ...

Science (URGENT#2)

Select any four of the physical properites listed in Table 1.1 on page 22 and use them to describe: gold, sugar, water. I don't quite understand what this question is asking. Here is the table of physical properties as mentioned. State - solid, liquid, gas Colour - colour ...


I need to be able to tie in acetic acid and boric acid. To decipher properties of acid-base chemistry and how they adhere to Le Chatelier’s principle. I appreciate any input....


Maxine is studying about electrolytes in her chemistry class. The teacher asks her to test 4 different solutions to determine how well each one conducts electricity. which solution will best conduct electric current? a) HC2H3O2 b) C2H5OH c) KOH d) H2O2


Maxine is studying about electrolytes in her chemistry class. The teacher asks her to test 4 different solutions to determine how well each one conducts electricity. which solution will best conduct electric current? a) HC2H3O2 b) C2H5OH c) KOH d) H2O2


cohol and Driving The concentration of alcohol in a person’s bloodstream is measurable. Suppose that the relative risk R of having an accident while driving a car can be modeled by the equation R = e kx where x is the percent of concentration of alcohol in the bloodstream ...

ms.pls help me urgent and thanks a lot to you

ms sue thank you so much. and please help me again for this answer so that i can submit to my teacher in english. . “Spoken language was the first form of communication between human beings, it came along with the written language, and writing is the transcript of speech not...


can someone reply to my previous chemistry thread please?

Chemistry- volumn

chemistry: 50mL HNO3 + 50.5mL HaOH = volumn?

PLZ look at Chemistry Questions!!!

No chemistry questions are getting answered =(


1. two cards are drawn from a standard of 52 cards. Find the probability that the second card is a spade given that the first card is a club. 2. Suppose you draw 3 cards from a standard deck of 52 cards . Find the probability that the third card is a club given that the first ...


Chemistry - MathMate, Tuesday, March 31, 2015 at 2:56pm 1m = 1000 mm (millimeter) 1 mm = 1000 μm (micrometer) 1 μ = 1000 nm (nanometer) If the tube is 1 nm in diameter, then veryify that 5 μm = 5*1000 nm = 5000 nm = how many diameters? Chemistry - MathMate, ...


In a survey of 200 students of a school, it was found that 60% study mathematics, 45% study physics, 35% study chemistry, 20% study mathematics and physics, 15% study physics and chemistry, 25% study chemistry and mathematics and 10% none of these subjects. Find the number of ...


Please help me with this chemistry question? I am working on a lab report and I am stuck on this question: Use the concept of stoichiometry to explain why balanaced equations are necessary when performing calculations in chemistry. Propose a situation where precise amounts of ...

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 ==> HCO3^- + OH^- Do an ...

Science help URGENT

Muscles located in the walls of the small intestine help push digested material along. Muscles located in the walls of arteries help push blood along. Based on this information and your understanding of muscle types, which of the following statements is correct? Both sets of ...

Chemistry 130

Can someone please help me with this question? Could freezing point depression be used for substances that are not soluble in water? Please help me....can you explain why? Is there anywhere I can find this information because my chemistry book doesn't have any info. about this...

vocab URGENT!

what is an antonym of paraphernalia and a sentence using it? and i also need if it can be translated to a noun verb adjectvie and adverb thanks!!!! Thank you for using the Jiskha Homework Help Forum. Since you are working on vocabulary, be sure to have a good dictionary and ...


I'm posting you a paragraph I wrote containing phrasal verbs. This is more urgent than the previous one. Thank you. 1) My friend looked very upset so I thought she needed to brighten up. I invited her to the cinema and she accepted. I thought popcorns would cheer her up. 2) I ...

Help!! #3 (URGENT)

What is "internal fertilization" and how does it happen? What kind of animals use this method? List a few animals. give two advantages and two disadvantages. What is it: when a sperm cell and an egg cell unite outside the bodies of the parents. How does it happen: if a ...

Biology URGENT!!!!!!!!!

I can't find how Acrasiomycota and Myxomycota excrete and circulate. I have tried wikipedia and every other thing i could think of. Please Help.


Ok I don't understand how to find similar figures when using proportions. Can someone explain it to me? Two figures that have the same shape are said to be similar. When two figures are similar, the ratios of the lengths of their corresponding sides are equal. To determine if ...


I left out the following sentences. Thank you for your help. It's urgent 1) I must always bring all my books and exercise books to school (class?) I must do (my) homework every day. 2) How can I get to the school (or to school?) from here? Do you know how I can get to the ...


Look up the solubility of NaCl in both water and ethanol (in the CRC handbook of chemistry which i don't have access to, and any help would be appreciated) Consider the dissolution process, and competing intermolecular forces to account for the observed differences in solubility.


  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
  12. 12
  13. 13
  14. 14
  15. 15
  16. 16
  17. 17
  18. 18
  19. 19
  20. 20
  21. 21
  22. 22
  23. 23
  24. 24
  25. 25
  26. 26
  27. 27
  28. 28
  29. 29
  30. 30
  31. 31
  32. 32
  33. 33
  34. 34
  35. 35
  36. 36
  37. 37
  38. 38
  39. 39
  40. 40
  41. 41
  42. 42
  43. 43
  44. 44
  45. 45
  46. 46
  47. 47
  48. 48
  49. 49
  50. 50
  51. 51
  52. 52
  53. 53
  54. 54
  55. 55
  56. 56
  57. 57
  58. 58
  59. 59
  60. 60
  61. 61
  62. 62
  63. 63
  64. 64
  65. 65
  66. 66
  67. 67
  68. 68
  69. 69
  70. 70
  71. 71
  72. 72
  73. 73
  74. 74
  75. 75
  76. 76
  77. 77
  78. 78
  79. 79
  80. 80
  81. 81
  82. 82
  83. 83
  84. 84
  85. 85
  86. 86
  87. 87
  88. 88
  89. 89
  90. 90
  91. 91
  92. 92
  93. 93
  94. 94
  95. 95
  96. 96
  97. 97
  98. 98
  99. 99
  100. 100