Saturday

April 19, 2014

April 19, 2014

Total # Posts: 2,499

**Chemistry**

John forgot to add the few drops of water resulting in the presence of some Mg3N2 in the final solid product. Will her reported magnesium to oxygen mole ratio be reported too high or too low? Explain. Hint: The Mg: N mass ratio is 1:0.38, and the Mg:O mass ratio is 1:0.66.

**Chemistry**

In a hurry to complete the experiment, Josh did not allow all the magnesium to react. Will his reported magnesium to oxygen ration be reported too high or too low? Explain

**Chemistry**

The burning of the magnesium becomes uncontrolled (it burn brightly. Oops! How will this procedural error affect the reported mole ratio of magnesium to oxygen in the analysis? Explain.

**Biology**

In the course of performing and interpreting daily !@#$%^&l lavages in a rat, a rat that had previously been exhibiting regular 4 day cycles starts a prolonged period of acyclicity which is dominated by cornified epithelial cells. A male rat also co-habits her cage, but is ste...

**geometry**

how do you do list the following elements in proper set notation. Place the elements in numerical order within the set. *0*123*4*34* 1

**eth/125**

I have also downloaded the RiverPoint Writer and it is a very useful tool, it will help you format papers in APA standards.

**eth/125**

These organizations have done very little on reducing tribal poverty and encouraging prosperity. As noted in our text: Today’s Native Americans are the “most undernourished, most short-lived, least educated, least healthy.” The BIA was organized to be in charge ...

**math**

what is a polynomial with a single root at x=-5 and a triple root at x=3

**Chem**

Is sodium benzoate soluble in HCl? I put yes What about NaOH? It's supposed to be created from a reaction with benzoic acid and NaOH What about NaHCO3? And aq. sodium benzoate plus HCl? And aq. sodium benzoate plus NaOH?

**Chemistry**

Is Glucose soluble in HCl, NaOH and NaHCO3 because it's soluble in water? - I put soluble for all because it dissolves in water. Is p-toluidine soluble in HCl, NaOH, and NaHCO3? I put soluble in HCl, insoluble in NaOH and insoluble in NaHCO3. Is benzoic acid soluble in HCl...

**math**

nick had 1 3/4 gallon of milk. how many pints of milk does nick have?

**ethnicity**

These organizations have done very little on reducing tribal poverty and encouraging prosperity. As noted in our text: Today’s Native Americans are the “most undernourished, most short-lived, least educated, least healthy.” The BIA was organized to be in charge ...

**calculus**

Now we prove Machin's formula using the tangent addition formula: tan(A+B)= tanA+tanB/1-tanAtanB. If A= arctan(120/119) and B= -arctan(1/239), how do you show that arctan(120/119)-arctan(1/239)=arctan1?

**Bio Please Help**

it's for a biology lab ...in physiology. I really don't even understand the question.

**Bio Please Help**

For high quality representation of an analog waveform that varies between 10Hz and 100Hz, a digital data acquisition system will have to record data at what minimum frequency? a. 1000 sps b. 5000 sps c. 200 sps d. 100Hz e. 50Hz

**Chemistry**

Describe the process by which adding potassium hydroxide to a saturated aluminum hydroxide solution reduces the concentration of aluminum ions. Write the solubility equilibrium equation and solubility product constant expression for a saturated aqueous solution of aluminum hyd...

**Civics**

How does someone become a supreme court justice?

**Civics**

what three rulings can result from a case in a federal appeals court?

**Civics**

How do federal district courts and federal appeals court differ?

**Civics**

describe how the current federal court system originated

**Physiology**

If the R waves of leads I and II are both 4mV, what is the value of lead III? a. 8mV b. 1mV c. -4mV d. 0mV e. -8mV

**Physiology**

If the R waves of leads I and II are both 4mV, what is the value of lead III? a. 8mV b. 1mV c. -4mV d. 0mV e. -8mV

**writing**

So, you need to write a paper,or an "essay." You probably need to write five paragraphs, unless your rubric tells you otherwise.Pick an interesting topic, even if you don't know a lot about it because you can always search it on the computer. It can be really fun...

**science**

How can computers predict the outcome of an election soon after the polls but before all the votes have been counted?

**math **

thank you for your help!!

**math **

No, when dealing with fractions, how do you fracture?

**math **

what is a fracture?

**chemistry**

that proportion solving for X doesnt give me a number listed as an option..I got 470

**chemistry**

if the ration of water drops to EDTA is 6.7 for the known sample and 10 for the unknown sample what is the concentration of the unknown sample? (The concentration of the known sample is 315 ppm) a. 150mg/L b. 210mg/L c. 280mg?L d. 320mg/L

**chemistry**

so would the answer be a. 10??

**chemistry**

what is the ratio of water drops to EDTA if 2 drops of EDTA was needed to change the color of 20 drops of water with unknown hardness? a. 10 b. 5 c. 0.1 d. 1.0 please explain..

**chemistry**

Bob pursle answered a very similar question this one has 2 drops and unknown hardness...

**chemistry**

what is the ratio of water drops to EDTA if 2 drops of EDTA was needed to change the color of 20 drops of water with unknown hardness? a. 10 b. 5 c. 0.1 d. 1.0

**chemistry**

what about this?? what is the ratio of water drops to EDTA if 2 DROPS of EDTA was needed to change the color of 20 drops of water with UNKNOWN HARDNESS? a. 10 b. 5 c. 0.1 d. 1.0

**chemistry**

what is the ration of water drops to EDTA (ethylenediamene tetraacetic acid) if 3 drops of EDTA was needed to change the color of 20 drops of water with known hardness?? a. 0.15 b. 1.0 c. 4.0 d. 6.7 am I missing something huge here??

**Pre-Algebra**

I need work the answer is 5 but i keep getting 4.5 if anyone can help me on the rest i got a page of work! 2y=20-4x*0

**chemistry**

which color of the visible region of the electromagnetic spectrum has the highest energy? a. red b. blue c. green d. violett

**chemistry**

which one of the following is a direct result of "hard water"? a. formation of a bathtub ring b. discoloration of clothers c. water spots on dishes d. maeks your skin feel slipper to the touch. I think its A but just wanted to double check.

**chemistry**

in any experiment does water in a beaker absorb or release energy in the form of heat?

**chemistry**

the answer I got is 1027 J/g.. right??

**nutritian**

which of the following food items should have the highest energy content? a. nuts b. popcorn c. marshmallow d. apple

**Chem 1LC**

Could someone please help me with this problem!!?!? Thanks you so much!!! The reduction potentials for the species involved in an electrochemical cell are as follows: M+ + e– M is 0.50 V J+ + e– J is 1.20 V. All solutions are 1.00 M and J+ J is connected to M+ M. A) ...

**math **

Can someone please help me I can't figure this out Find the center and radius of the circle. (x - 4)2 + (y + 6)2 = 16

**Algebra 2**

a) A population of 460 animals that increases at an annual rate of 15%. Write an exponential function to model. b) Write an exponential function to model. Predict the value of the function after 5 years(nearest whole number). A population of 430 animals that decreases at annua...

**6th grade math**

240

**Chemistry**

A pressurised can of whipped cream has an internal pressure of 1.33x105 Pa at 25.0 oC. If it is placed in a freezer at -15.0 oC, what is the new value for its internal pressure (in Pa)?

**Algebra II**

suppose you are biking down a hill at 24 mi/h. What is the angular speed, in radians per second, of your 27-inich-diameter bicycle wheel?

**science gr.5**

what 3 things would i miss the most if there were no pulleys and gears in the world?

**math **

The graph shows the y axis has a positive 5 on the top and a negative one the bottom. The X axis show the same the same thing

**math **

State the solutions, or estimated solutions, to each quadratic equation in Exercises 23–26 by examining the graph of the related quadratic function equation 2x2 - 3x - 4 = 0 and Graph:y=2x^2-3x-4 Can someone help me with this

**math**

Thank you so much

**math**

For which table(s) of values in Exercises 39–42 is the relationship linear? Tell how you decided. Write the equation for each linear relationship. x 5 10 15 20 25 30 y 20 30 40 50 50 50 I understand this is not linear function but what is it asking me to do next.

**chemistry**

Calculate enthalpy change of reaction for the combustion of gaseous ethanol. C2H5OH + 3O2 >> CO2 + 3H2O. Using standard molar enthalpies of formation. C2H5OH -235.3 ( it's negative sign) CO2 -393.5 H2O -241.8 (1) Calculate the enthalpy change of reaction per mole of ...

**Chemistry**

given the true molar masses of CuSO4 and H2O how could you find the exact formula of the hydraye from your experimental data. Find the Value of X in the Formula CuSO4x XH2O

**Chmeistry**

given the true molar masses of CuSO4 and H2O how could you find the exact formula of the hydraye from your experimental data. Find the Value of X in the Formula CuSO4x XH2O

**5th grade math**

thanks....I haven't even been shown that way to figure it out. Thanks so much!

**5th grade math**

two numbers are reciprocals of each other and one of them is four times as large as the other. what are the two numbers?

**Math**

Try doing it with casework. Case: 1 1,9 x2 2,8 x2 3,7 x2 4,6 x2 2+2+2+2=8. That's it for case one since Diane only has one stamp for each. Case: 2 1,2,7 x6 1,3,6 x6 1,4,5 x6 2,3,5 x6 6+6+6+6=24. Case: 3 1,2,3,4 x24 The total answer is 8+24+24=56.

**math**

use fraction bars to find the quotient 2/9 divided by 1/6

**math**

Solve 2cosx-sin^x +2 =0 for all real values of x

**chemistry**

which of these salts is least soluble in water? 1. LiCl 2. RbCl 3. FeCl2 4. PbCl2

**7th grade**

just roll it and through it away

**english**

In the space provided, write a paragraph of cause and effect. You may use one of the topics below or one of your own choosing. Mention at least three causes and their three effects. friendship as a two-way street television and preschoolers vitamin deficiency in teenagers the ...

**college**

Determine the flux through a circular coil (diameter = 8.2 cm) when the magnetic field is 1.5 T and is oriented at 32.6 degrees with respect to the coil's normal.

**college**

what is the most important element for creating a magnetic field.

**physics**

what is the most important element for creating a magnetic field. and why? Moving charges..... right?

**Gen Chem**

Ok, how about this one? A solution contains ammonium ions and calcium along with some anions, how would you separate the ammonium ions from the calcium??

**General Chemistry**

Thank you DrBob222!!!

**General Chemistry**

if lead nitrate was added to sodium nitrate, how could one get the lead ions out of the sodium nitrate?

**Chemistry **

Hey guys I was wondering if you guys know the answer to this: Which of the following is NOT true of colligative properties? Colligative properties are... A. independent of the chemical identity of the solute. B. responsible for lowering the vapor pressure of a solution versus ...

**Chemistry**

[4 points] In a recent poll, 10 local students were asked how many beers they drink in a typical week. The responses, in no particular order, were: 4, 10, 6, 14, 12, 17, 30, 15, 12, 0 At a 90% confidence level, is there an outlier in the data given above? At a 95% confidence l...

**Chemistry**

2. [4 points] Serum cholesterol levels were monitored to investigate the effect of physical training. Prior to this training, blood samples were acquired from each of the 12 subjects and were tested for cholesterol level. After a week-long training period of daily running, the...

**Chemistry**

[6 points] You need to make a solution of Ca(NO3)2 for a class demonstration. First, you measure a quantity of the solid Ca(NO3)2 by weighing the reagent container before obtaining the sample (4.2540 ± 0.0003 g) and after taking some reagent (3.9440 ± 0.0003 g)....

**English**

I'm suppose to identify and label the Subject Compliments, Object Compliments, Direct Objects, and Indirect Objects in each of these sentences. I've got most of them already but I'm having trouble with just a couple. Please Help, 1. Accomplishments have no color. 2...

**English**

I'm suppose to identify and label the Subject Compliments, Object Compliments, Direct Objects, and Indirect Objects in each of these sentences. I've got most of them already but I'm having trouble with just a couple. Please Help, 1. Accomplishments have no color. 2...

**English**

I'm suppose to identify and label the Subject Compliments, Object Compliments, Direct Objects, and Indirect Objects in each of these sentences. I've got most of them already but I'm having trouble with just a couple. Please Help, 1. Accomplishments have no color. 2...

**Math (fractions)**

2 8/9 + 1 1/2 2 16/18 + 1 9/18 52/18 + 27/18 79/18

**Calculus**

You need to use the multiplication rule: y = 2 sinx cosx y' = 2 d/dx (sinx * cosx) y' = 2 [ (sinx * -sinx) + (cosx * cosx) ] y' = 2 [ -sin^2 x + cos^2 x ] y' = 2cos^2 x - 2sin^2 x

**Math**

A company is increasing production at the rate of 25 units per day. The daily demand function is determined by the fact that the price (in dollars) is a linear function of q. At a price of $70, the demand is 0, and 100 items will be demanded at a price of $60. Find the rate of...

**ALGEBRA**

3x + x(x-1)=0 3x + x^2 - x = 0 x^2 + 2x = 0 x (x - 2) = 0 x=0 x=2 There are two answers, x=0 and x=2 To find the y intercepts, set x = 0: y = 3x + x(x-1) y = 3(0) + 0(0-1) y = 0 + 0 y = 0 So the y intercept is at 0

**math**

Trapezoid?

**math **

a^2+k^2=j^2 a^2 = j^2 - k^2 a = square root ( j^2 - k^2 )

**chemistry**

I am using Na2S2O3.5H2O. By large amount i mean about 15 grams

**chemistry**

why is sodium thiosulfate readily soluble in water? how can a large amount of it be dissolved into only 3 ml of water?

**Calc 2, Series/Sequences**

Explain clearly in detail the difference of the summation of n=1 to infinity of 1/n^2; and the integral of 1/x^2dx with the limit of 1 to infinity, as well. Part 2: Explain the natures of the two expressions and explain why the summation is greater than the integral test. The ...

**To Alex - re Math**

thank you

**Math**

To measure the height of a building,two sightings are taken a distance of 50 feet apart. Of the first angle of elevation is 40 degrees and the second is 32 degrees, what is the height of the building?

**math**

A pendulum swings through an angle of 20 degrees each second. If the pendulum is 40 inches long, how far does its tip move each second?

**math**

what happens to the 16 inches and 14 inches.

**math**

The radius of each wheel of a car is 16 inches. At how many revolutions per minute should a spin balancer be set to balance the tires at a speed of 90 miles per hour? What is the setting for a wheel of radius 14 inches?

**Trig.**

The bearing would be 360-17.14= 342.86 due to the fact that the bearing scale is different than the unit circle.

**Math**

In each case, determine whether the situation calls for a discrete or continuous random variables and explain your answer.

**Math**

find each quotient, using long division (5x^4+14x^3+9x) / (x^2+3x+1)

**4th grade math**

got it. i just started mulitplying small numbers(like 3 & 4) by the numerator and denominator of 14/3(cause 14/3 is what you get when you turn mixed numders of 4 2/3 into improper fractions. so i got 42/9 & 56/12. correct?

**4th grade math**

ok but how do you get those?

**4th grade math**

write 3 different improper fractions that equal 4 2/3

**chemistry**

what is an example of autocatalysis? what will the graph of the rate of an autocatalytic reaction versus time look like?

**physics**

A series RLC circuit has a resonant frequency of 6.00 kHz. When it is driven at 8.00 kHz, it has an impedance of 1.00 k(ohm)and a phase constant of 45 degrees. What are the R (resistance), L (inductance), and C (capacitance) of the circuit?

**Global History**

Hitler translated his hatred into a program of genocide. How do ethnic, racial, and religious hatreds weaken society? is the answer because people believe race can create conflicts towards different gropus of race

**Global History**

Last question i promise. Describe Hitler's blitzkrieg tactics.

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