Questions Asked on
June 20, 2009

chemistry
what do you observe in the displacement reaction of zinc and lead nitrate? also, what is the symbol equation for this reaction?
asked by Nabiha 
chemistry
A mixture of hydrogen peroxide, H2O2, and hydrazine, N2H4, can be used as a rocket propellant. The reaction is: 7 H2O2(g) + N2H4(l) ® 2 HNO3(aq) + 8 H2O(l) a) How many moles of H2O2 react with 0.477 mol N2H4? [1] ___________ b) How many grams of HNO3 can
asked by dan 
Organic chemistry
compound with a molecular formula C8H16O has the following Hnmr spectrum: 3H triplet at 0.90, 1.0 to 1.6 8H multiplet, 2.05 3H singlet, 2.25 2H triplet. What is the structure of this compound? I think it is 2octanone but not sure
asked by jeff 
physics
can you show me how to do this mathematically A car traveling 90 km/h is 100 m behind a truck traveling 75 km/h. How long will it take the car to reach the truck?
asked by Physics 
University math grade 11 Trig
A very tall light standard is swaying in an eastwest direction in a strong wind. An observer notes that the time difference between the vertical position and the furthest point of sway was 2 seconds. The pole is 40 metres tall. At the furthest point of
asked by Liza 
Chemistry
If you add Na2CO3 and AgNO3 together in a test tube what exactly would you observe and what would be the equation for the equilibrium system? If you then add HNO3 to the solution what exactly would you observe and what would be the equation for that
asked by Sylvia 
economics
Explain this statement: the most unlikely problem of the national debt is that the government will go bankrupt.
asked by Karry 
Math
Use the substitution method to find solution sets (x,y) for the following systems of equations: 3x5y=11 6x+2y=26
asked by Scott 
medical billing and coding from Penn Foster
I am writing a research paper for HIPAA, I beleive I have most of the information to do the paper. I do not understand what it means by writing it in proper MLA/APA citation style? Could someone please explain this to me and show me a small example of what
asked by Shannon 
mat115
A rectangular picture window is 6 ft by 4 ft. Polly wants to put a trim molding around the window. How many feet of molding should she buy?
asked by wayne 
chemistry
what exactly would you observe and see at the end of the reaction of zinc and lead nitrate? include in formation about colour changes and bubbles. you can use the following equation to help; zinc+lead nitrate(arrow) zinc nitrate+lead
asked by Nabiha 
chemistry
A 10.0 mL sample of 3.00 M KOH(aq) is transferred to a 250.0 ml volumetric flask and diluted to the mark. It was found that 38.5 ml of this diluted solution was needed to react the stoichimetric point in a titration of 10.0 mL of a phosphoric acid, H3PO4,
asked by dan 
chemistry
does this sound right for what happens with the zinc and lead nitrate reaction? could i add anything else? The zinc displaces the lead. You can observe the lead preipitating on the zinc surface. The zinc changes to black crystals which dissolve in the
asked by Nabiha 
Physics
The last stage in the fusion of hydrogen to form helium in the Sun involves the formation of an alpha particle (4He) from two 3He nuclei: 3He + 3He 4He + p + p The binding energy for 3He is 2.57 MeV per nucleon and that for 4He is 7.07 MeV per nucleon.
asked by Angie 
maths
make the letter in the bracket the subject of the formulae: v=u3t (t) a=b4c (c)
asked by Nabiha 
Physics
You are told that the volume of a sphere is given by V=(sqrt)d^3/4, where V is the volume and d is the diameter of the sphere. Is this equation dimensionally correct?
asked by Greg 
chemistry
why does zinc and lead nitrate react?
asked by Nabiha 
Physics
Would someone check this please? A circular loop of wire of radius 0.10 m and of resistance 2.0 x 10^−3 ohms is in a region where there is a uniform magnetic field B. The field is at 30deg to the normal to the plane of the wire loop as shown in Figure 3.
asked by charlie 
Math
Name the property that justifies each step. [(2x100)+(3x10)]+[(1x100)+(5x10)] = (2x100)=[(3x10)+(1x100)]+(5x10) I think this is Commutative = (2x100)+[(1x100)+(3x10)]+(5x10) I think this is Distributive property =[(2x100)+(1x100)]+[(3x10)+(5x10)] I think
asked by B.B. 
analysis and design
5.2 Project Risks [Use this section to list at least five risks factors and their potential impacts for the project.] # Risk Area Likelihood Risk Owner Project ImpactMitigation Plan 1 [Project Risk] [High/Medium/Low] [Replace this text with a description
asked by Becky 
Phoenixuniversity
How did you come up with answers to Comprehensive Grammar Checkpoint
asked by Sara 
Literature Help quick question
In the book you don't know me by david klass does anyone know what John's stepfather name was? I think it was Stan but I'm not sure.
asked by Rita 
maths
make v the subject of the formulae: v=2v+3u
asked by Nabby 
physics
the speed of a car can be measured in s^1 m right... it could be said that a speed of a car the velocity was 15 s^1 m which is perfectly acceptable... by definition 15 s^1 m can also be written as 15 Hz m just by definition... what on earth does that
asked by Physics 
Helth
700 words paper evaluating the financial aspects of the Wic Program How do they fund their programs? o How reliable are their funding sources? o Do they implement financial accountability measures to ensure that funds are being used properly? o What
asked by Fay 
math
Show that any positive odd integer is of the form 6q+1, 6q+3 or 6q+5, where q is any positive integer
asked by priya 
chemistry
Long but quick chemistry lab that I need confirmation on answers if possible? OK so I have this lab that went pretty quick and smooth and I have an online assessment that I needed to put all my figures in. I am all complete but am having trouble with 3
asked by Capacino 
Physics
A racecar driver in an 825kg car accelerates from rest to a velocity of 21.5 m/s in 0.55 s. What is the net force acting on the car? I found out using A=v/t that the horizontal acceleration is 39.1 m/s^2. My problem now is this... Is the net force just
asked by Hannah 
analysis and design
My project is upgrading a bathroom and this is what I need help with: Project Risklist 5 factors and their potential impact for the project. Project Constaintsex: triple constaints variable (cost,time/schedule and scope)are there any possible limitations
asked by Becky 
Math
What does relative to math?
asked by Liza 
math
b. A number is divisible by 8 if it is divisible by 4 and divisible by 2.
asked by chandice 
Business
Which government entities regulate the securities that Verizon issues?
asked by Linda 
Business
Which investment bank does Verizon use to issue stock?
asked by Linda 
Business
Which two lenders does Verizon use?
asked by Angel 
math
If a number is divisible by 4 and 6, it must be divisible by 24
asked by chandice 
elementry math
How do the ideas of divisibility and multiples relate to the study of fractions?
asked by jessica 
Algebra
Given that f(x) = x^23 and g(x) = 2x+1 find each of the following if it exists. (g/f) (1/2)
asked by Rachale 
lewis structure for molecules
HELLO, I AM LOOKING FOR ONLINE EXERCISES/WORSHEETS TAT I CAN USE TO PRACTISE HOW TO DRAW lewis structure for molecules. I AM LOOKING FOR RELABLE SOURCES, I DON'T WANT TO USE JUST ANY WEBSITE BECAUSE I'M AFRAID THEY WILL CONTAIN ERRORS? COULD SOME ONE
asked by ME 
re
what is the miracle of Lourdes? is it about the young girl called Bernadette? thanks
asked by niv 
Math
Can someone help me with this problem? Evaluate the numerical expression on a calculator. Round the answer to the nearest whole number. ( 34*15) (364)  *  (5) (52) Here is what I figured: (510) (364)  *  (5) (52) = (185640) 
asked by B.B. 
Maths ...
Hi Can anyone help with this little problem , I have to compare the percentage change for the following numbers from a graph (Tonnes) Comparing the lower years with the year 2050 Year 2050 = 14672.873 2046 = 14745.197 1990 = 6096.0 I have worked out the
asked by Gary 
Algebra
Please Help! Confused! I got an answer but it is not correct. Can someone help? Thanks! Given that f(x) = x^2  3 and g(x) = 2x + 1, find each of the following, if it exists. (gf) (1/2)
asked by Jen 
Physics
when trying to find uncertanty percent error and your given the number  15 s^2 m with a implied uncertanty of +/ 1 s^2 m and you try to find the percent uncertanty and you do this ( 15 s^2 m)^1 1 s^2 m (100 %) is the percent negative or positve also
asked by Physics 
designs
nice henna/mehndi designs....? didn't find any interesting ones on google
asked by y912f 
math
Show that any positive integer is of the form 4q, 4q+2, where q is any positive integer.
asked by priya 
Algebra
y = (1+x)/(1x) How do I rearrange that equation to be: x = (y1)/(y+1)
asked by Sean 
english
on an exam if you are given an essay to read & then deconstruct.....how do you do this Thanks
asked by SCOTT 
health care
Where do you think health care quality will be ten years from now?
asked by april 
math
The following conjectures were made by students. Which do you think are false? Give a counterexample for each conjecture if possible. a. Only half of the nonzero even numbers up to 100 are divisible by 4.
asked by chandice 
math
c. If 12 divides a number, 6 also divides the number.
asked by chandice 
math
A customer wants to make a teepee in his back yard for his children. He plans to use lengths of PVC plumbing pipe for the supports on the teepee, and he wants the teepee to be 12 feet across and 8 feet tall. How long should the pieces of PVC plumbing pipe
asked by Kay 
Sci275
I am doing my final project on energy conservation.What are some good resources on energy conservation?
asked by sam 
math115
a sales person drove 238
asked by Anonymous 
algebra
what is the snswer to this sum a x 4 = d
asked by Rosiebee