Monday
March 30, 2015

Posts by anonymous


Total # Posts: 79,540

Chemistry
Please help! If equal volumes of the following are combined, would they form buffered solutions? Why or why not? .1M HF and .05M NaF I'm am a bit confused about how I can figure out if these will form buffers or not, so I'd really appreciate it if someone could explain...
January 19, 2015

ap calc
the original should be ((x^2-4)^2)^(1/2) dx
January 19, 2015

ap calc
then how would I solve because the derivative of x^2-4 =2x and in the original there is only a dx.
January 19, 2015

ap calc
integrate ((x^2-4)^2))^(1/2) Would the 2 and the 1/2 cancel
January 19, 2015

Chemistry
If equal volumes of the following are combined, would they form buffered solutions? Why or why not? 1) .1M NaC2H3O2 and .1M HF 2) .1M HF and .05M NaF I'm am a bit confused about how I can figure out if these will form buffers or not, so I'd really appreciate it if ...
January 19, 2015

chem/stats
Find the absolute error for the answer of the following equation: square root of 3.24 plus-minus 0.08 end root equal 1.80 plus-minus ?
January 19, 2015

analytical chem
You have a bottle labeled “53.4 (±0.4) % w/w NaOH” with a density of 1.52 (±0.01) g/mL. You use 16.7 (± 0.2) mL of the NaOH to prepare 2.00 (±0.02) L of 0.169M NaOH. Report the absolute error for the 0.169M of NaOH. You may assume ...
January 19, 2015

Anal Chem
A method for the analysis of the drug diazepam in blood consistently produces results that are low by -5.4%. If the measured concentration of diazepam in a patient’s blood sample is 2.02 ppm, what must be the actual concentration in their blood (in ppm)?
January 19, 2015

Analytic Chem
You have a bottle labeled “53.4 (±0.4) % w/w NaOH” with a density of 1.52 (±0.01) g/mL. You use 16.7 (± 0.2) mL of the NaOH to prepare 2.00 (±0.02) L of 0.169M NaOH. Report the absolute error for the 0.169M of NaOH. You may assume ...
January 19, 2015

Science
Is "how did our planet form" a scientific question?
January 19, 2015

math
A survey of students determined that 14 drove to school, 28 took the bus, 8 walked, 35 shared a ride and 15 had another means of transportation to school. On a pie chart, the slice representing students who took the bus would be approximately _______ degrees.
January 19, 2015

Science
How does cell differentiation connect to other branches of science or STEAM (science, technology, engineering, art, mathematics)
January 19, 2015

ap calc
ok thanks
January 19, 2015

ap calc
where does the one half come from in F(x)
January 19, 2015

ap calc
If f(x)= (2x+7)^(1/2), where F'(X)=f(x) and F(1)=7, then F(x)=? I know I need to use integration but I do not know how to take the anti derivative of the equation
January 19, 2015

calc
if f'(x)=3x^2-2x+1 and the graph of f(x) contains the point (2,2). find f(x). Please help I know I need to use integration
January 19, 2015

arithmetic
0.2[5.28-(0.7)=
January 19, 2015

mathematics
Arrange the following fractions in ascending order 7/15,5/12,3/7
January 19, 2015

English
okay thank you!!
January 19, 2015

English
okay, but what does it mean?
January 19, 2015

English
What do you think is meant by "linguistic playfulness" ?
January 19, 2015

chem
What volume of 0.0658 M calcium hydroxide is required to neutralize 45.10 mL of 0.0242 M nitric acid?
January 19, 2015

chemistry
When hydrochloric acid reacts with magnesium metal, hydrogen gas and aqueous magnesium chloride are produced. What volume of 4.8 M is required to react completely with 2.60 g of magnesium?
January 19, 2015

geometery Indirect Measurement
For triangle MNP shown, find the value of x and the measure of each of the three angles.
January 19, 2015

Calculus
a student is drinking a milkshake with a straw from a cylindrical cup with a radius of 5cm. if the student is drinking at a rate of 3.5cm^3 per second, how fast is the level of a milkshake dropping?
January 19, 2015

Biology
You have a stock solution of 100mg/100ml methylene blue and you need 6.0 ml of final solution at 2mg/100ml. Design a serial dilution using volumes between 0.1 and 10 ml. Final volume must be 6ml.
January 19, 2015

Biology
You have a bacterial suspension and you need to dilute it to 0.0010 of the initial concentration so that you can determine the number of colonies per milliliter. The volumes must be between 0.1 and 2 ml. Your final volume must be 1 milliliter.
January 19, 2015

Biology
You need 25ml of 2% milk solution (v/v. How much milk and water will you need?
January 19, 2015

Biology
You have been asked to make 200ml of 50% detergent solution (v/v). How would you do it?
January 19, 2015

Biology
You need to prepare 270ml of a 20% sucrose solution (w/v). Sucrose has a molecular formula of C12H22O11. How would you prepare this solution?
January 19, 2015

Math
0.5 ≤ y __ 8
January 19, 2015

Math
Does (2+5i)+(-2-4i) equal to 0+1i, or i?
January 18, 2015

Math
You can cross-multiply 5 -- * 2800 7 5 -- * 400 = ???? 1 Or Divide 5 by 7 and multiply the product by 2800.
January 18, 2015

physics
You're sailboarding at 6.1m/s when a wind gust hits, lasting 6.8s accelerating your board at 0.49m/s2 at a 35∘ to your original direction. 1. Find the magnitude of your displacement during the gust. Express your answer using two significant figures. 2. Find direction...
January 18, 2015

Physics
Thanks! One question: Do I have to convert km/h to m/s at the beginning? Will I get the same answer if I convert at the end?
January 18, 2015

Calc
Find the point on the parabola x+y^2=0 that is closest to the point (0,-3).
January 18, 2015

physics
A car, initially going eastward, rounds a 90 ∘ curve and ends up heading southward. If the speedometer reading remains constant, what is the direction of the car's average acceleration vector? Express your answer using three significant figures.
January 18, 2015

physics
Write an expression for a unit vector at 45∘ clockwise from the x-axis. Express your answer in terms of the unit vectors i^ and j^.
January 18, 2015

physics
You're sailboarding at 6.1m/s when a wind gust hits, lasting 6.8s accelerating your board at 0.49m/s2 at a 35∘ to your original direction. 1. Find the magnitude of your displacement during the gust. Express your answer using two significant figures. 2. Find direction...
January 18, 2015

physics
An object is moving in the x-direction at 1.1m/s when it undergoes an acceleration a⃗ =0.56j^m/s2. Find its velocity vector after 4.8s . Express your answer as a comma-separated pair of components. Express your answer using two significant figures
January 18, 2015

PED 121
Question 3. 3. Lesson plans should be infused with local, state and national standards in order to support (Points : 1
January 18, 2015

Math
How do you write a quadratic equation with information saying that it opens upward, has a pattern of 1, 3, 5, and a vertex of (-4,5)?
January 18, 2015

Mathematics arithmetic sequence
14-3n
January 18, 2015

statistics
The 2003 Statistical Abstract of the United States reported the percentage of people 18 years of age and older who smoke. Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of .32. a. How large a ...
January 18, 2015

chemistry
Lol
January 18, 2015

physics
A car, initially going eastward, rounds a 90 ∘ curve and ends up heading southward. If the speedometer reading remains constant, what is the direction of the car's average acceleration vector? Express your answer using three significant figures.
January 18, 2015

physics
Write an expression for a unit vector at 45∘ clockwise from the x-axis. Express your answer in terms of the unit vectors i^ and j^.
January 18, 2015

physics
A model rocket is launched straight upward. Its altitude y as a function of time is given by y=bt−ct2, where b = 80m/s , c = 4.9m/s2 , t is the time in seconds, and y is in meters. 1. Use differentiation to find a general expression for the rocket's velocity as a ...
January 18, 2015

chemistry
The combustion of a compound which contains only C and H yields 2.58 g of CO2 and 0.53 g of H2O. What is the empirical formula of the compound?
January 18, 2015

Physics
the coefficient of friction between block A and the horizontal surface is 0.43. What must be the weight of teh hanging block B if this block is to descend at constant speed once it has been set into motion? Mass of block A is 5.0 kg
January 18, 2015

Alcohols,phenolsðers
I asked this question & wanna know ANS
January 18, 2015

Alcohols,phenolsðers
How2 convert CH3OH into CH3CH2OH
January 18, 2015

Calculus
1. The radius of a sphere is expanding at a rate of 14 in/min. a) Determine the rate at which the volume is changing when the radius is 8 in. b) Determine the rate at which the surface area is changing when the radius is 8 in. 2. A particle moves along a path described by y=4-...
January 18, 2015

French
Is "vieil homme" or "homme vieil" correct? I think it is the former because it describes age.
January 18, 2015

Science
guys, please give me any ideas for a investigatory project in physics ???
January 17, 2015

math
thank you so much Ms.Sue :))
January 17, 2015

math
• what is statistics • Perspective statistics • inferential statistics • Data statistics • Example of a Quantitative data • Example of a Qualitative data • What is population •what are the different scale of measurement • what are ...
January 17, 2015

Calculus
1. The radius of a sphere is expanding at a rate of 14 in/min. a) Determine the rate at which the volume is changing when the radius is 8 in. b) Determine the rate at which the surface area is changing when the radius is 8 in. 2. A particle moves along a path described by y=4-...
January 17, 2015

engineering
In an electric car, regenerative braking is used to recharge batteries. The principle of regenerative braking involves converting the kinetic energy of the vehicle into energy stored in a battery. If a car is traveling at a speed of 30 km/h and is stopped completely by braking...
January 17, 2015

AP CHEMISTRY
an unknown metal reacts with chlorine to produce 6.84 g of metal chloride. when metal chloride dissolves in 100 mL of solvent the metal ion concentration is 0.43 M. What is the unknown metal?
January 17, 2015

algebra
the picture will be hung on a wall where the distance from the floor to ceiling is 8 feet. The center of the picure must be 5 1/4 feet from the floor. Determine the distance from the ceiling to the top of the picture frame.
January 16, 2015

Math
Miguel is 5 feet 10 inches tall. On a sunny day he casts a shadow 4 feet 2 inches long. At the same time, a nearby electric tower casts a shadow 8 feet 9 inches long. How tall is the tower? How do I set this up into ratios to figure out the tower height?
January 16, 2015

Math
A blue rope is three times as long as a red rope. A green rope is 5 times as long as the blue rope. If the total length lf the three ropes is 508.26 meters, what is the length of the blue rope?
January 16, 2015

math(5th grade)
Pls help me
January 16, 2015

physics
A person is standing on and facing the front of a stationary skateboard while holding a construction brick. The mass of the person is 89.0 kg, the mass of the skateboard is 4.10 kg, and the mass of the brick is 2.50 kg. If the person throws the brick forward (in the direction ...
January 15, 2015

Biology
You need to prepare a 0.25 M solution of NaCl but you only need 50 ml of this solution. How many grams of NaCl would you need?
January 15, 2015

Biology
How many grams of glucose are needed to make 500ml of a 3.0M solution of glucose?
January 15, 2015

Biology
You need to make 2.5L OF 3M H2SO4. H2SO4 comes as a stock solution in a concentration of 18M. How many ml of stock H2SO4 would you need to make the new solution?
January 15, 2015

5th grade science
How might the history of the United states be different if the first European settlements had occurred on the west coast instead of the east coast
January 15, 2015

Math
When a tire is labeled "185/70/14" that means it is 185 mm wide, the sidewall height (from the rim to the road) is 70% of its width, and the wheel has a diameter of 14 in. What is the tire's sidewall height?
January 15, 2015

science
Fertilizers and pesticides applied to farm fields in Pennsylvania have made their way to Chesapeake Bay Maryland, this is an example of _____________ pollution.
January 15, 2015

SS
Did the Spanish come to the Americas with Columbus, or did they come later?
January 15, 2015

SS
But did he ever come to know of the truth?
January 15, 2015

SS
Did Columbus come to know that he was not in India when he reached the Caribbean? I find mixed answers online.
January 15, 2015

alegbra 1
x+y=5 x-3y=3
January 15, 2015

math
cost of levelling of circular ground @ 25 paisa/square meter is 2500.Help me find the radius of this ground
January 15, 2015

solid mensuration
a high way curve is to be laid out on a circle. what radius should be used if a trailer truck is to change direction by 28 degrees in a distance of 112 meters?
January 15, 2015

solid mensuration
a certain city block is in the form off parallelogram. two of it's side are each 225 meters long, the other two sides are each 145 meters long. if the distance between the first two pair is 80 meters. find the area of the land in the block and the length of the diagonals.
January 15, 2015

Math
When Minnesota became a state in 1858 there were approximately 150,000 people living here. in the 2010 census the population for Minnesota was 5,303,925 people. Find a model that would apprxoimate the population in Minnesota between 1858 and 2010. Let t=0 correspond to 1858. ...
January 14, 2015

health
if a client is working on reducing stress what should the fitness professional suggest as a first step
January 14, 2015

Logarithms
Prove that log base a of x divided by log base a/b of x is equal to 1+log base a of(1/b) Where do I start?
January 14, 2015

Calculus POwer RUle
If the slope of the curve y=−kx^3+ 3k at x=-2 is 3, then what is the value of k?
January 14, 2015

School
Okay, Thanks to both of you!
January 14, 2015

School
Like for example when he talks about Eli Whitney and Interchangeable parts we have a little section in the notes that we have to fill in but we do it after he's done talking. Even though he'll tell us what goes in the blank, I miss information he tells us beforehand
January 14, 2015

School
Yeah he usually gives us printed notes where we just fill in blank spaces. He tells us what to fill it in with after he's done talking about the topic. But before we fill in the notes, he usually explains to use the topic which where I drift off
January 14, 2015

School
Because I'm not the type of learner who can just sit there and remember the information so I just hope there are some tips
January 14, 2015

School
I have a question.. So my teacher just talks the whole class about information and the thing is.. I'll be listening but then after awhile I'll accidentally wander off and just miss information I needed to know. Are there good tips for me to just stay focused the whole ...
January 14, 2015

history
thanks!
January 14, 2015

history
Which of the following was neither part of the Confederacy nor th eUnion? A. Minnesota b. Texas C. Michigan D. Colorado Minnesota? On second thought, Michigan???
January 14, 2015

science
I grand daughter has this fill in the blank: Electically__________ objects push or _____________ on other electrically charged objects. This produces___________. Please fill in the blanks please. Because we don't know... Thanks!!!!
January 14, 2015

Math
So that means d wasn't correct?
January 14, 2015

Math
Mr. Jenkins is going to buy museum tickets for a class trip. The museum director quotes him the following prices: • 20 tickets cost a total of $250. • 30 tickets cost a total of $375. • 50 tickets cost a total of $625. a. Based on these prices, is the cost of ...
January 14, 2015

Physics
Two identical objects of the same mass and at the same initial temperature cool off. If object A cools off faster than object B, what can you say about the specific heats of the two objects?
January 14, 2015

math
thank you yes it is hard to explain
January 14, 2015

math
Ms. Sue can you please help?
January 14, 2015

math
I just want to see if my answers are correct and if no, can you please show your work and explain how to do it? Thank you. A. (x^1/2)^4√x^6 I got an answer of x^2x B. √x^4y^12 I got an answer of xy C. 3√a^6b^3 I got an answer of a^2b D. (x^1/3y)^3√x^2y^...
January 14, 2015

Law
many attorneys pose issues beginning with the word: a. "here" b. "now" c. "whether" d. "whatever" My answer: C
January 14, 2015

math
whats 9+10
January 14, 2015

math
You need to hire a part-time associate to work 30 hours a week in your store. You have $250 in labor budget for the new associate each week. You just interviewed an excellent candidate for the position who has requested to be paid $9.00 per hour. Your average part-time ...
January 14, 2015

accounting
n kjj
January 13, 2015

Pages: <<Prev | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | Next>>

Members