Questions Asked on
June 19, 2010

chemistry
Convert 3.01 x 1023 molecules of C2H6 to moles.
asked by HELP!!! 
physics
A thin 2 kg box rests on a 6 kg board that hangs over the table. the length of the board on the table is 30 cm and the length of the board hanging off the table is 20 cm. How far can the center of the box be from the end of the table before the board
asked by Anonymous 
chemistry
How many atoms does 2.0 moles of He represent?
asked by HELP!!! 
chemistry
How many grams of NaCl will be produced when 22.85 g of HCl are neutralized by an excess of NaOH according to the equation below? HCl + NaOH ¨ H2O + NaCl
asked by andrea. 
Geography
A circulating current of warmer material(such as magma) P.S It is 2 words and they are _ _ _ _ _ _ _ _ _ _ / _ _ _ _ _ _ _
asked by Alex 
Chemistry
Air entering the lungs ends up in tiny sacs called alveoli. It is from the alveoli that oxygen diffuses into the blood. The average voume of the alveoli is .00000000078 L. Assuming that the pressure in the alveoli is 1.0 atm and the temperature is 37
asked by Anonymous 
chemistry
Nitrogen monoxide reacts with oxygen according to the equation below.. 2NO + O2 > 2NO2... How many moles of NO are required to produce 5.0 moles of NO2 in excess oxygen?
asked by Monica 
Chemistry
Determine the molar mass of a gas with a density of 1.3786 g/L at 80.00 degress celsius and exactly 1 atm.
asked by Joann 
Calculus  URGENT EXAM
I HAVE AN EXAM REVIEW QUESTION AND I REALLY NEED HELP. An airplane has an air speed of 330km/h and is heading in a direction of N30E when it encounters a wind from the north. The resultant ground velocity has a direction of N40E. How long does it take for
asked by Santha 
chemistry
pls explain your answer Which of the following solutions would be expected to be the best conductor of an electric current at room temperature? a. 1.0 M CH3COOH b. 0.10 M CH3COOH c. 0.10 M CO(NH2)2 d. 0.10 M Na2SO4 e. 0.10 M NaCl thanks
asked by Mohamad 
chemistry
How many grams of aluminum would react completely with 17.50 grams of copper (II) chloride according to the following equation? Al(s) + CuCl2(aq) > AlCl3(aq) + Cu(s
asked by andrea. 
Maths
A square has an area of S^2 and a regular hexagon has a perimeter of T. If p is the perimeter of the square and h is a side of the hexagon, then find h+p in terms of S and T.
asked by Mark 
chem
sorry . Can you please help me with this questions If you know? Oxalic acid is a relatively strong diprotic acid with Ka1 = 5.6 ´ 102 and Ka2 = 5.1 ´ 105. What is the C2O42 concentration in a solution that is 0.10 M in oxalic acid and 1.0 M in HCl?
asked by khin 
math
A test is composed of six multiple choice questions where each question has 4 choices. If the answer choices for each question are equally likely, find the probability of answering 3 OR 4 questions correctly. 0.131836 0.032959 0.004639 0.164795
asked by molly 
math
A certain aircraft can fly 768 miles with the wind in 4 hours and travel the same distance against the wind in 6 hours. what is the speed of the wind?
asked by Anonymous 
Calculus
A travel agency currently has 80plp signed up a tour. The price of a ticket is $5000 per person. The agency has chatered a plane seating 150 plp at a cost of $250000. Additional costs to the agency are incidental fees of $300 per person. For each $30 that
asked by Adeola 
chemistry
what is the oxidizing agent in the equation 8H(aq)+ 6Cl(aq)+ Sn(s)+ 4NO3(aq)yields SnCl6(aq)+ 4NO2(g)+ 4H2O
asked by Ellie 
Math
The cost C, in dollars, to produce graphing calculators is given by the function C(x)=57+4500, where x is the number of calculators produced. How many calculators can be produced if the cost is limited to $129,900?
asked by Anonymous 
physics
Two masses are hanging over a frictionless, massless pulley as shown blocks_pulley_aMass m1 is 5.0 kg and mass m2 is 7.0 kg
asked by bill 
science
the atomic mass of N is 14 u and that of Ca is 40 u. the proportion of n by mass in the compound Ca3N2 is what?
asked by Frank 
chem
A solution that is formed by combining 600. mL of 0.20 M NaOH with 400. mL of 0.40 M HNO3 has an H+ concentration of
asked by leona 
chemistry
How many grams of potassium nitrate are required to produce 5.00 g of potassium nitrite according to the equation below? 2KNO3(s) > 2KNO2(s) + O2(g)
asked by andrea. 
Calculus
When air expands adiabatically (without gaining or losing heat), its pressure P and volume V are related by the equation PV^{1.4}=C where C is a constant. Suppose that at a certain instant the volume is 530 cubic centimeters and the pressure is 97 kPa and
asked by Thomas 
chemistry
How many moles are represented by 16.0g of ethanol, C2H5OH?
asked by kourtney 
Thermochemistry
A 1.00g sample of solid calcium was burned in fluorine to give a 1.95 g sample of pure CaF2. The energy given off in this reaction was 30.3 kJ. Given this information, we can say that the heat of formation of 1 mol of CaF2 is
asked by joan 
Hayden
Chloroacetic acid has a relatively large equilibrium constant, so at low acid concentrations it is necessary to use the quadratic equation in order to calculate the concentrations of the aqueous species. Ka for ClCH2COOH is 1.4 ´ 103. For the problems
asked by leona 
English
1. Bob is 4 cm shorter than Emily. 2. Mr. Pitt is 16 kg heavier than Emily. 3. Emily is 1 year younger than Bob. 4. Bob weighs 4kg more than Emily. (Are the expressions correct grammatically?)
asked by rfvv 
Maths 3u trig
If sinA = 1/3 and cosA
asked by Jenny 
Chemistry
A precipitate will be formed when an aqueous carbonic acid soution is added to what other aqueous solution? A. ammonium chloride B. calcium hydroxide C. Sodium Chloride D. Potassium carbonate E. Nitrous acid
asked by Ellie 
geometry
A spherical water tank has a diameter of 10 feet. How much water does it hold when half full (use 3.14 for , and round to the nearest hundredth)?
asked by dan 
chemistry
calculate the density of helium in a helium balloon at 21.7 degress celsius. (Assume that the pressure inside the balloon is 1.15 atm.)
asked by Joann 
trig
Solve for [0, 360) 2sinxcosx + cosx =0 2sinxcosx = cosx 2sinx = cosx/cosx sinx = 1/2 {210, 330) Is this correct?
asked by Sara 
Chemistry
what is the net ionic equation for NaOH + H2SeO3?
asked by Ellie 
math
The cost in millions of dollars, to remove x%of pollution in a lake is mideled by C=6.000/2002x. A.) What is the cost to remove 80% of the pollutant? Remember that the cost is in millions of dollars. B.) For what value is the equation undefined? What does
asked by Taylor 
chem101
A 7.2 ´ 103 M solution of acetic acid is 5.0% dissociated. In a 7.2 ´ 104 M solution, the percentage of dissociation would be Value A. The same. B. >5%. C.
asked by shahd 
Algebra
Evaluate the exponential equation for three positive values of x, three negative values of x, and at x=0. Transform the second expression into the equivalent logarithmic equation; and evaluate the logarithmic equation for three values of x that are greater
asked by Sol 
chemistry
what is the volume of 4.37 moles of an ideal gas at 26.5 degrees celsius and 1.00 atm?
asked by Amanda 
Business Negotiations
What are the five types of power? I don't know what the five types are and everytime zi search there is something different per, doctorol, attorney, etc... this is 5 types of power in business or negotiations. Based on your experience with a negotiation,
asked by BC 
Marketing
The ____ area of the marketing mix is concerned with decisions about getting the right product to the target market when and where it is wanted. a)People b) product c) place d) promotion
asked by Pam 
Algebra
16. Going into his final exam, John has a total of 72 points out of 90 possible in his history class. His final exam is worth 10 points. How many points must he get on his final exam to end the class with an 80%? 8? 17. Joan actually likes 30% of her male
asked by mysterychicken 
maths  trigonometry
I've asked about this same question before, and someone gave me the way to finish, which I understand to some extent. I need help figuring out what they did in the second step though. How they got to the third step from the second. [sinx + tanx]/[cosx + 1]
asked by anonymous 
chemistry
How many total atoms are in 1.0 moles of H2O ?
asked by HELP!!! 
Teaching as a Profession
• Write a 200 to 300 word paper in which you list 3 to 5 factors that define teaching as a professional career. Elaborate on how these factors are employed by teachers on a daily basis. Here is what I have thus far. i was having trouble elaborating on
asked by Anonymous 
science
balance any 25 chemical equation and write the name of the reactant and the product. mention the catalist when ever required.
asked by priya 
soc120
which agents of socialization are most important at certain stages of human development? for example, discuss how the family is important to moral development or how peer groups are important to personality development .
asked by bud 
Calculus
If f(x) = 4ln(5 x+ 4ln(x)), find f'( x ).
asked by Jason 
college
You're thinking of investing in a automation project to reduce cost of production. Investment in Fixed Assets: $900,000 at t=0; salvage value of $300,000 at t=6; straight line deprectiation over 6 years (assume book value is 0 at t=6) Investement in NWC:
asked by Dan 
Algebra
Totally lost here! Evaluate the exponential equation for three positive values of x, three negative values of x, and at x=0. Transform the second expression into the equivalent logarithmic equation; and evaluate the logarithmic equation for three values of
asked by Ally 
Chem
mass of empty cylinder is 87.470g 97.470g w/10mL of water 107.470g + 10mL of water 117.470g + 10 more mL of water need to know the total volume of water (in mL or cm3) total mass of water density of water calculate the average of the 3 densities of water.
asked by dra 
math
The cost in millions of dollars, to remove x%of pollution in a lake is mideled by C=6.000/2002x. A.) What is the cost to remove 80% of the pollutant? Remember that the cost is in millions of dollars. B.) For what value is the equation undefined? What does
asked by Taylor 
engineering
why exponential model may be better choice for modelling data than the linear model.
asked by Candy 
physics
a car of height H could negotiate a bend on a banked road of certain degree and of radius r with a maximum speed. is it possible for a truck of height 3H to negotiate that same bend with same speed at that same angle.show proof to back the condition
asked by sandra 
Chem
Using this formula.. pH = log(H^+) find the pH 1.6 x 10^(5)
asked by Zen 
soc120
• Due Day 4 (Thursday): Choose a family member or someone you know well who has experienced most adult life stages, such as a parent, grandparent, or an older brother or sister. Describe examples of how socialization occurred at different stages of this
asked by bud 
math
Can you give me step by step instruction on how to solve this problem Helium is pumped into a spherical balloon at a constant rate of 4cubic feet per second. How fast is the radius increasing after 3 minutes? At what time (if any) is the radius increasing
asked by Artis 
Economics
which country would rank as the best place to raise a child. Be sure to include comparisons such as Literacy rates, infant mortality rates, and any other comparison of a country that you feel might be important to your child.
asked by Kim 
math
How long is the side of a square picture that can fit inside a circular picture frame that has a diameter of 8 inches? Hint: Pythagorean Theorem
asked by jr 
algebra
4(2x+y)3(x5)
asked by Rose 
chemistry
with would be more convenient? (A) burn 1 mole of carbon with 2 moles of sulfur and mesure the energy yield (B) burn 602,000,000,000,000,000,000,000 atoms of carbon with 1,204,000,,000,000,000,000,000,000 atoms of sulfur and measure the energy yield.
asked by eriika 
Religion
I have read the chapter on Hinduism, in a book called Living Religion by Mary Fisher, but I am having difficulty finding the answer to the following question: What are the cultural and societal influences that have made Hinduism vital to the region in
asked by Tonni 
chemistry
How many moles of oxygen gas (O2) are in 448L at STP (273K and 1 atm of pressure)?
asked by kim. 
chemistry
Find the molar mass of Hg2Cl2
asked by ninki 
effective essay writing
Post your response to the following: Select one of the essays from the Examples of Effective Conclusions section in Effective Introductions and Conclusions. Which article did you choose? What kind of conclusion does the writer use? What is the impact of
asked by Anonymous 
Biology
Consider the following events: 1) The protein has sugar added to become a glycoprotein. 2) The protein is in the plasma membrane with the sugar modification facing outside the cell. 3) A membrane protein is synthesized in the rough endoplasmic reticulum.
asked by Patrice 
Government/Economics
Which of the following statements is incorrect? a.)Early representative parliaments were elected by the people. b.)The development of representative parliaments helped establish the principle of consent of the governed. c.)Representation is a crucial
asked by Ariel 
English
I am an English learner and I have a hard time in understanding the below sentences. "It's a dead issue. These days you can hardly get people to read about a live issue. People are issued out." dead issue= people stop talking about it? And what does "issue
asked by Anonymous 
computers
How do you think a presenter can find balance in providing information and using the PowerPoint as a "tool" to keep the audience's attention?
asked by terry 
chemistry
I know the answers for these questions, I just want to learn why 1 Use the table to determine which of the following species will convert Cd2+ to Cd. A. Fe3+ B. Pb2+ C. Zn D. Co2+ E. Sn 2 Which of the following salts will form an acidic aqueous solution?
asked by zidan 
computers
Hello everyone I have this homework about protection programs can you tell me wat these r. plz The Data protection act The Computer missuse act and one more which iv'e forgotten Can you tell me what that missing one is or wat those acts are all about.
asked by Alex 
GCSE geography
Examples of how has technology aided the spread of globalisation. thankyou
asked by dancer 
Algebra
Evaluate the logarithmic function for three values of x between zero and one, three values of x greater than 1, and at x=1. Show your work. Use the resulting ordered pairs to plot the graph. State the domain and the range of the function. g(x) = ln x + 2
asked by Zen 
Algebra
Can anyone tell me if this answer is correct? Solve the problem. Let's imagine that in 2001, a surgeon performs the first brain transplant, the only transplant performed that year. If in 2010, there are 983 brain transplants, find an exponential growth
asked by Xan 
english
can anyone tell me the indivituality displayed by othello in the play by shakespeare?
asked by ray 
health care
Develop a unique proposal that describes a new health care system. Consider the current U.S. health care system’s strengths, weaknesses and challenges.
asked by jonny 
chemistry
If you have a mole of eggs, how many eggs do you have?
asked by eriika 
chemistry
How many moles of NaCl are in 16.0 grams of NaCl?
asked by kourtney 
Chemistry
Under constamtpressure conditions a sample of hydrogen gas initially at 93 degress celcius and 8.1 L is cooled until its final volume is 1.7 L. What is the final temperature?
asked by Amanda 
Equation
4x (little 2) =0 Not sure what name the technique means. I know this is a Quadratic Equation.
asked by Lisa 
college biology
Consider the following events: 1) The protein has sugar added to become a glycoprotein. 2) The protein is in the plasma membrane with the sugar modification facing outside the cell. 3) A membrane protein is synthesized in the rough endoplasmic reticulum.
asked by Patrice 
psyhology
identify the relation of psyhology to other science
asked by Anonymous 
Music
Which one of the following is characteristic of Brahms's compositions? A. Hollow sounds and dissonant melodies B. Wellorganized and welldeveloped themes C. Feeling of selfpity and despair D. Radical innovations i think the answer is (B) or (D)im leaning
asked by Ringa 
Math help
what does a and b represent in linear regression Y=aX+b.
asked by Tim 
Math help
Hi again how can i get the growth factor by using exponential regression from the function Y = a(b^x) and i have calculated the value of a and b.
asked by Tim 
Geography
What do the crust and upper mantle form?
asked by Alex 
Geography
A type of Wave P.S It's _ _ _ _ _ _ _ and it's not tsunami
asked by Alex 
chemistry
What is the concentration of the propionate ion at the equivalence point?
asked by random 
Communication and Gender Studies
What are some male stereotypes and the role language had in shaping these stereotypes?
asked by Audrey 
gcse science
how would you get iron from iron oxide?
asked by harry 
Algebra
Need help with this: 39. Money in a bank account that compounds interest by some percentage acts _____ a. linearly b. exponentially c. negatively d. like a fraction I'm stuck between A or B... Thanks MC
asked by mysterychicken 
Algebra
How to solve for 3n = 5 ? I know it has to do with log, but I'm not sure how to find the answer. Thank you so much in advance ^^
asked by Lynn 
College Math
I have been struggling with this problem I cannot get the right answer. Please give me the steps to solve this problem. Let f(x)= (2x9)(x^2 + 6) (A) Find the equation of the line tangent to the graph of f(x) at x=3 (B) Find the values(s) of x where the
asked by Ronnie 
english
What journey did othello go through both physical and emotional in the play ?
asked by marina 
English
If anyone has read the novel the power of one can you tell me the individuality peekay displayed in the novel?
asked by marina 
physics
An object is thrown down with a speed of 80 m/s. What is its speed 2 s later?
asked by Brittani 
english
select the sentence in which the verb correctly agrees with the subject.
asked by Laurie 
math
The annual Salary of an electrical engineer is given in terms of the years of experience by the table below. Find the equation of linear regression for the above data and obtain the expected salary for an engineer with 45 years of experience. Round to the
asked by molly 
medical billing and coding
how will employees in the medical office have to be trained regarding privacy
asked by soad 
Math
^4sqr1296
asked by Anonymous 
chemistry
4. If you have a mole of copper atoms, how many copper atoms do you have?
asked by eriika 
chemistry
calculate the number of atoms of C of 25.0g C?
asked by ana 
chemistry
Find the molar mass of AlCl3
asked by kim. 
chemistry
Find the molar mass of Na2Al2(SO4)4
asked by ninki 
Chem
how do you find the total volume of water total mass of water and density of water?
asked by dra 
chemistry
how di i use PV=nRT for: How many moles of oxygen gas (O2) are in 448L at STP (273K and 1 atm of pressure)? need help!
asked by kim. 
algebra
(ab)¯³ a³ x b³ = 1/a³ x 1/b³= 1/a^2b^2 why is the exponent changed to 2 and does not remain 3? Thanks
asked by Chrysanne 
Algabra
I need to know step by step how to complete the square to this problem: x^212x
asked by Marlo 
Scientology
Does anyone know anything or have an opinion on Scientology (religion) I have chosen this as my final topic it is 2500 words and I only have 1500 I have been to the sites, I have done the research, but I have yet to ask people what they think or know of
asked by BC 
Chemestry
What is the pH? 1.6 x 10^(5)?
asked by Kate