Wednesday

August 24, 2016
Total # Posts: 497

**Chemistry**

25.0 mL of an H3BO3 solution were titrated with 29.15 mL of a 0.205 M LiOH solution to reach the equivalence point. what is the molarity of the H3BO3 solution?
*August 23, 2016*

**Science - Please Look!**

Thanks so much! :)
*August 22, 2016*

**Science - Please Look!**

The senses are used to make which of the following? inferences predictions evaluations ((**observations**)) You walk into the kitchen and see a broken egg on the floor. Which of the following is an inference you can make based on this observation? ((**The egg rolled off the ...
*August 22, 2016*

**Chemistry**

use combined gas laws
*June 16, 2016*

**all**

someobody plz helpppppppppp
*June 16, 2016*

**all**

anyone have some good tips on how to study for bio phys and chem
*June 16, 2016*

**Math**

ooohkay, thank you!! i needed this so bad :D
*June 7, 2016*

**Math**

THANK YOU REINY!!! however, what does RS mean?
*June 7, 2016*

**Math**

Prove that the following Trigonometric Identity is valid: 1/(sin(y)-1)-1/(sin(y)+1)=-2sec^2 (y) Please any help or clues on how to do this is needed. I have a sheet that tells me valid identities but nowhere on it has info on -2sec^2 (y) I am sooo clueless here :(
*June 7, 2016*

**Chemistry**

The molar solubility of silver iodide in a 0.186 M potassium iodide solution is __________ M.
*May 27, 2016*

**Chemistry**

Write a balanced net ionic equation to show why the solubility of Ca(OH)2(s) increases in the presence of a strong acid and calculate the equilibrium constant for the reaction of this sparingly soluble salt with acid.
*May 27, 2016*

**Chemistry**

The mass of lead bromide that is dissolved in 250 mL of a saturated solution is____ grams.
*May 27, 2016*

**Chemistry**

The solubility of Mg(OH)2 is measured and found to be 9.25×10-3 g/L. Use this information to calculate a Ksp value for magnesium hydroxide
*May 27, 2016*

**Chemistry**

When it comes to something being spontaneous, what does it mean? I know its something that goes out without no outside force or something like that but what are example of something that is spontaneous ?
*May 25, 2016*

**Chemistry**

What is the change in enthalpy of the following reaction? 2NaBr(aq) + PbCl2(aq) 2NaCl(aq) + PbBr2(aq) Given: NaCl: ∆H = -411 kJ NaBr: ∆H = -360 kJ PbCl2: ∆H = -359 kJ PbBr2: ∆H = -277 kJ Im lost with this. Everytime I try to do it, it doesn't come ...
*May 25, 2016*

**Physics**

I'm confused about this question: "A car traveling at 60 mi/h stops in 6 seconds. How far does it travel during this time?" I can't figure out what formula to use, or how to begin solving this.
*May 24, 2016*

**Chemistry **

The diagram shows an electrochemical cell with a gold strip (left) and aluminum glasses (right). In your response, do the following: • Label the cathode and the anode, including the charge on each. • Show the flow of electrons. • Describe what type of ...
*May 13, 2016*

**Chemistry**

3. The diagram shows an electrochemical cell with a gold strip (left) and aluminum glasses (right). In your response, do the following: • Label the cathode and the anode, including the charge on each. • Show the flow of electrons. • Describe what type of ...
*May 13, 2016*

**chemistry**

Cu2+ + 2e- -> Cu Oxidation reaction Cu -> Cu2+ + 2e Reduction Reaction Do I have these right, or are they backwards?
*May 9, 2016*

**Electroplating in Chem**

Today I began an electroplating lab between a copper strip and a coin in electrolyte solution with a battery. I am struggling to figure out the copper half-reactions that occured, and whether they are reduction or oxidation. I only need two, and one is Cu2+ + 2e- -> Cu ...
*May 9, 2016*

**Algebra **

Does the data in the table represent a direct variation or an inverse variation? x 1 3 4 7 y 5 15 20 35 Write an equation to model the data in the table
*May 2, 2016*

**Physixs**

In my homework example, it says that there are 234 nucleons (140+94) bound in the products of this reaction: n-1 + U-235 ---> Ba-141 + Kr-92 + 3n-1 Where are they getting that number??? I though you added up the protons and neutrons to find how many nucleons there are, but ...
*May 1, 2016*

**SS**

Just a helper is right got 100% thank you
*April 26, 2016*

**chemistry**

Write and balance the equation for the reaction between nitric acid and potassium iodide. The products are potassium nitrate, iodine, nitrogen monoxide, and water. 2HNO3 + KI = KNO3 + I + 2NO + H2O (Did I write the equation correctly?)
*April 14, 2016*

**Chemistry**

O.k So would this be correct? K=(4.00 mol/L)(1.25 mol/L) /(1.75 mol/L)2 (3.00 mol/L) K=0.544 mol/L
*April 13, 2016*

**Chemistry**

I can plut the numbers into the equation but do I need to do anything with the 25*C?
*April 13, 2016*

**Chemistry**

For the reaction: 2NO(g) + H2(g) <=> N2O(g) + H2O(g) + energy Write the equilibrium constant expression for the reaction. I wrote: [N2O][H2O] / [NO]2 [H2] This reaction takes place at 25°C. At this temperature the concentration of NO is found to be 1.75 mol/L, the ...
*April 13, 2016*

**Science**

For the reaction: 2NO(g) + H2(g) <=> N2O(g) + H2O(g) + energy Write the equilibrium constant expression for the reaction. This reaction takes place at 25°C. At this temperature the concentration of NO is found to be 1.75 mol/L, the concentration of H2 is 3.00 mol/L, ...
*April 13, 2016*

**Chemisty**

For the reaction: 2NO(g) + H2(g) <=> N2O(g) + H2O(g) + energy Write the equilibrium constant expression for the reaction. This reaction takes place at 25°C. At this temperature the concentration of NO is found to be 1.75 mol/L, the concentration of H2 is 3.00 mol/L, ...
*April 13, 2016*

**Chemisty**

For the reaction: 2NO(g) + H2(g) <=> N2O(g) + H2O(g) + energy Write the equilibrium constant expression for the reaction. This reaction takes place at 25°C. At this temperature the concentration of NO is found to be 1.75 mol/L, the concentration of H2 is 3.00 mol/L, ...
*April 13, 2016*

**chemistry**

(7 points) 1. The reaction that you just witnessed in while doing your titration was: HCl + NaOH H2O + NaCl. This equation is balanced. Your unknown solutions contained HCl solutions of unknown concentrations, and your titrant was a 0.75 M solution of NaOH. Use the ...
*March 21, 2016*

**Language Arts**

I think it's a but I'm not sure!!! it might be d?
*March 18, 2016*

**intro to computers**

You create a formula in A8 that adds up the numbers listed in A1 through A7. You copy the formula and paste it into C8. What happens in C8? A. The sum of cells A1 through A8 appears. B. The sum of cells C1 through C8 appears. C. The sum of cells A1 through B8 appears. D. The ...
*February 20, 2016*

**Chemistry**

An aqueous solution is composed of 7.50 g NaCl (MM = 58.44 g/mol) diluted to 0.100 L. Calculate the osmotic pressure of the solution at 298 K a. 5.83 atm b. 9.22 atm c. 18.3 atm d. 62.8 atm
*February 6, 2016*

**Social Studies Quiz, Please help!**

You have all of them right!
*January 29, 2016*

**Math**

Grade 11 Unversity Functions. The question was part of the final "Thinking" category for our periodic functions test.
*January 24, 2016*

**Math**

The diameter of a car's tire is 60cm. While the car is being driven, the tire picks up a nail. At what times in two complete cycles is the nail at a height of 1cm above the ground. So far, I have calculated the circumference of the wheel (188.5) and I do not know the next ...
*January 24, 2016*

**AP Physics**

A 25 degree incline sits on a 1.2 meter high table. a ball rolls off the incline with a velocity of 4 m/s. how far does the ball travel across the room before reaching the floor?
*January 18, 2016*

**English12**

In Pope's essay on Man, how does the speaker cast humankind's relationship to both God and His creation?
*December 9, 2015*

**English12**

What do the speakers of Sir Thomas Wyatt's "Whoso List to Hunt" and Edmund Spenser's "Sonnet 30" have in common? How are they different?
*December 8, 2015*

**Math**

Sam is 2 years and his mother is 28 years old. In how many years will Sam's mother be 3 times as old as he will be?
*December 6, 2015*

**science**

Specific heat capacity of solid ethanol is 2.419 J/g C. Melting point temperature of ethanol is -114.4 C/ 158.8 K. Enthalpy of fusion of ethanol is 106.4 J/g. Specific heat capacity of liquid ethanol is 2.440 J/g C. 44.0 g of solid ethanol at -134.4 C is dropped into a Dewar ...
*November 23, 2015*

**Math**

Joe borrowed $2000 from the bank at a rate of 7% simple interest per year. How much interest did he pay in five years?
*November 17, 2015*

**science, biology**

is my answer correct ? Both genetics and the environment contribute to the height of a plant. Plants attain their traits from their parents like humans. A plants offspring comes from somewhere, and that somewhere is the parent plant. The parent plant then has traits it ...
*October 22, 2015*

**science, biology**

1. What is/are the main factor(s) that determine(s) that your plants will grow into bean plants (or other fast-growing plants that you used for your experiment) and not some other type of plant (genetics, environment, or both)? Explain your answer.
*October 22, 2015*

**algebra **

I don't quiet know where to start can anyone help guide me? Bonnie has a container in the shape of rectangular pyramid. The formula for the surface area of the enclosed space is S=lw+0.5Ph. Solve for P? P= S - lw- 0.5h P= S + lw + 0.5h P= S-lw/ 0.5h P= S/lw + 0.5h
*October 5, 2015*

**Math**

1.7 x 10^-3 = (0.0015 - x)^2 / (0.025 +1/2x) (0.025 + 1/2x) solve for x
*October 2, 2015*

**Oklahoma History**

What are the four principal mountain ranges in Oklahoma? 1.) Ouachita Mountains 2.) Wichita Mountains 3.) Arbuckle Montains 4.) _______________
*September 30, 2015*

**physics **

Knowing that in most all movement situations the mass of the system stays constant, how do you get the momentum of a system to change?
*September 20, 2015*

**physics **

Add the following vectors: 440 N at 100 degrees 905 N at 160 degrees A.1187.7 N at 128.7 degrees B.1010.4 N at 48.2 degrees C.1345 N at 130 degrees D.1013.5 N at 149 degrees
*September 20, 2015*

**science**

2 is A
*September 14, 2015*

**Commonwealth connections academy**

Yes Im right.
*September 8, 2015*

**Commonwealth connections academy**

Just did this one 1. D 2. A 3. A 4. B 5. D
*September 8, 2015*

**physics**

A car (m = 1870 kg) is parked on a road that rises 12.1 ° above the horizontal. What are the magnitudes of (a) the normal force and (b) the static frictional force that the ground exerts on the tires?
*August 12, 2015*

**Managerial Accounting**

Doughboy Bakery would like to buy a new machine for putting icing and other toppings on pastries. These are now put on by hand. The machine that the bakery is considering costs $78,000 new. It would last the bakery for ten years but would require a $9,000 overhaul at the end ...
*August 1, 2015*

**Managerial Accounting **

Direct materials: 7 microns per toy at $0.32 per micron Direct labor: 1.2 hours per toy at $6.80 per hour During July, the company produced 4,600 Maze toys. Production data for the month on the toy follow: Direct materials: 70,000 microns were purchased at a cost of $0.31 per ...
*July 31, 2015*

**Criminal Justice**

I am trying to explain: Assess the impact of globalization on the U.S. criminal justice system. Compare and contrast international criminal justice systems (Civil Law, Common law, and Islamic Law and Socialist Law traditions). Discuss the impact that cyber crime and technology...
*June 20, 2015*

**CHEMISTRY**

50 ML OF ACID AT 1.836 SPECFIC GRAVITY HOW MANY GRAMS OF ACID?
*May 20, 2015*

**Math**

113.04
*May 19, 2015*

**Math**

5400
*April 30, 2015*

**Calculating and Reporting Healthcare Statistics**

How do you: Calculate the total inches of documents filed per day for all clerks. Calculate the total documents filed per day for all clerks. Calculate the weekly total inches of documents filed per clerk (round to two decimal points). Calculate the weekly total documents ...
*April 23, 2015*

**linear algebra**

oh its just the transpose . nevermind
*April 21, 2015*

**linear algebra**

sorry its a little displaced but that should be a 3X3 matrix
*April 21, 2015*

**linear algebra**

Find the inverse of each of the following orthogonal matrices. A= [1 0 0 0 cos(theta) sin(theta) 0 -sin(theta) cos(theta)]
*April 21, 2015*

**Physics**

an object falls from a 3m height what is the speed of the object just before it touches the ground?
*April 6, 2015*

**Algebra 2**

A car’s headlight contains a parabolic reflector. A special bulb with two filaments is used to produce the high and low beams. The filament placed at the focus produces the high beam and the filament placed off-focus produces the low beam. The equation of the reflector ...
*March 31, 2015*

**art**

Sid.V is right 100% 1.d 2.B 3.C
*March 31, 2015*

**social studies**

Berlin
*March 31, 2015*

**Math**

At the local grocery store, 6 bananas and 3 oranges cost $10. Also, 3 bananas and 5 oranges cost $12. What is the combined cost of one banana and one orange at the local grocery store? Round to the nearest cent.
*March 12, 2015*

**Astro**

A newly discovered planet orbits a distant star with the same mass as the Sun at an average distance of 118 million kilometers. Its orbital eccentricity is 0.5. A.Find the planet's orbital period. B.Find the planet's nearest orbital distance from its star. C.Find the ...
*March 4, 2015*

**math**

Consider a slide shaped like a right triangle. The base of the slide is 45 feet away from the ladder. The top of the slide is 20 feet high. a) What is the slope of the slide. b) write an equation for the line that the slide would form. c) Lets say you were standing at the ...
*February 19, 2015*

**English check**

enderman is 100% right
*February 19, 2015*

**math**

Consider a slide shaped like a right triangle. The base of the slide is 45 feet away from the ladder. The top of the slide is 20 feet high. a) What is the slope of the slide. b) write an equation for the line that the slide would form. c) Lets say you were standing at the ...
*February 19, 2015*

**math**

Sally is buying 6 identical shirts. The original price for one shirt is 39.99. The store is having a "buy one get one half off" sale and Sally has a coupon for an additional 25% off. The sales tax rate is 4 3/8. What is the total cost for the items Sally purchased. ...
*February 10, 2015*

**Social Studies**

how are religion and culture connected?
*January 22, 2015*

**Chemistry**

In a titration experiment involving an unknown concentration of HCl and a 0.100M solution of NaOH(aq), it was determined that it took 12.5mL of NaOH to neutralize 20.0mL of the HCl(aq). Write a balanced chemical equation for this reaction and determine the concentration of the...
*January 22, 2015*

**Chemistry**

Calculate the pH and concentration of H3O of a 0.285M HCl solution.
*January 22, 2015*

**Chemistry**

Calculate the pH and concentration of H3O+ of a 0.285M oxalic acid solution.
*January 22, 2015*

**Chemistry**

That was super helpful, thanks!
*January 22, 2015*

**Chemistry**

What is the pH of the resulting solution when 25.0mL of 0.100 HNO3(aq)are reacted with 20.0 mL of 0.175M NaOH(aq)? Is the resulting solution acidic or basic in nature?
*January 22, 2015*

**Chemistry**

What is the pH of the resulting solution when 25.0mL of 0.100 HNO3(aq)are reacted with 20.0 mL NaOH(aq)? Is the resulting solution acidic or basic in nature?
*January 22, 2015*

**Gen Science 2**

lightning is actually an enormous display of the concept of? A) chemical heating B) solar energy C) magnetism D) groundind
*January 19, 2015*

**Math**

about 24.8 million people live in texas. about 0.6 million live in vermont. how many times as many people live in texas than in vermont. round to the nearest tenth if necessary. i got 41.333 (41) as my answer.am i correct
*January 14, 2015*

**Math**

Thanks
*January 14, 2015*

**Math**

P= 1.50
*January 14, 2015*

**Math**

Laney buys 3 containers of yogurt. She has coupons for $0.35 off the regular price of each container. After using the coupons, the total cost of the yogurt is $3.45. What is the regular price of a container of yogurt? ?????? No idea
*January 14, 2015*

**Biology check please**

1. Who most influenced Darwin's idea that life could change slowly over a long period of time? (1 point) Malthus Hutton and Lyell Lamarck livestock breeders and farmers 2. Who most influenced Darwin's idea that some offspring are better suited to survival than others...
*January 9, 2015*

**american history**

The puritan ______ became the governor of the Massachusetts bay colony A.roger Williams B.william bradfords C.john Winthrop D.Arnold hutchinson
*December 29, 2014*

**help asap **

7. Verify that parallelogram ABCD with vertices A(–5, –1), B(–9, 6), C(–1, 5), and D(3, –2) is a rhombus by showing that it is a parallelogram with perpendicular diagonals. (3 points)
*December 9, 2014*

**please check my english**

1. Which phrase, in "The Prisoner Who Wore Glasses," best describes Brille? (1 point) easygoing and generous with his friends intelligent, yet shortsighted in his political views intuitive and calculating in his appraisal of others quickthinking and quick...
*December 4, 2014*

**please help english**

1. Which phrase, in "The Prisoner Who Wore Glasses," best describes Brille? (1 point) easygoing and generous with his friends intelligent, yet shortsighted in his political views intuitive and calculating in his appraisal of others quickthinking and quick...
*December 4, 2014*

**math**

At the amusement park, you decide to ride the Ferris wheel, which has a maximum height of 80 meters and a diameter of 40 meters. It takes the wheel seven minutes to make one revolution. Write the sinusoidal function, f(t), that models the height of your chair at any time, t. I...
*November 21, 2014*

**Geometry**

It's snowing today therefore it is December.
*November 11, 2014*

**Psychologic**

All of the above
*October 26, 2014*

**Algebra**

You have been hired by a cell phone company to create two rate plans for customers, one that benefits customers with high usage. The cell phone rates may compare usage of minutes or usage of text messaging. At 500 minutes or 200 text messages, both plans should be within $5 of...
*October 24, 2014*

**algebra**

Samir begins riding his bike at a rate of 6 mph. Twelve minutes later, Chris leaves from the same point and bikes along the same route at 9 mph. At any given time, t, the distance traveled can be calculated using the formula d = rt, where d represents distance and r represents...
*October 17, 2014*

**Geometry**

the answer is #2
*October 9, 2014*

**physics**

a Baseball player throws a ball for the outfield horizontally such that it is released 1.5 meters above the ground. if the ball is to reach second base 20.0 meters away, how fast must the ball be thrown so that is does not bounce before reaching the base
*September 30, 2014*

**Pre-Calc (Point of Inter.)**

A diagonal of a cube is a line segment of maximum length whose endpoints are vertices of the cube. To the nearest degree, what is the angle of intersection Ѳ, 0 < Ѳ <= 90° between two distinct diagonals of the same cube?
*September 28, 2014*

**4th grade math**

4 is the GCM because 3x4=12 and 5x4=20 the gcm or greatest common multiple is the largest number that both the factors(in this case 12 and 20) have in common
*September 17, 2014*