Thursday
May 26, 2016

Posts by kat

Total # Posts: 480

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

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

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
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

Physics
A 330.0 g block is dropped onto a vertical spring with a spring constant k = 234.0 N/m. The block becomes attached to the spring, and the spring compresses 0.26 m before momentarily stopping. A) While the spring is being compressed, what what is the change in the objects ...
September 7, 2014

algebra 2
wait I think it would be 0.94 not 0.96 . the answer would be 90,000
September 4, 2014

algebra 2
0.96 x = 84,600 x = 84,600/0.96 x = $ 88,125 selling price
September 4, 2014

algebra 2
89,676 but I thought I had to set up problem as an algebraic?
September 4, 2014

algebra 2
Sonia is selling her house through a real estate agent whose commission is 6% of the selling price. What should be the selling price so Sonia can get $84,600?
September 4, 2014

algebra 2
How many gallons of milk containing 5% butterfat must be mixed with 90 gallons of 1% milk to obtain 2% milk?
September 4, 2014

Business/Finance
A $120,000, 5% 200-day note dated June 6 is discounted on October 8. The discount period is _______ days. a. 142 b. 67 c. 124 d. 76 C is wrong
August 31, 2014

Criminal Organization
Write a 1,050- to 1,750-word paper, using definitions, principles, and theories from previous assignments, in which you establish a thesis regarding the control of organized crime. I am just not understanding what my instructor is asking.... Please help!!!!!!
August 17, 2014

Precalculus
A small business owner buys a truck for $20,000 to transport supplies for her business. She anticipates that she will use the truck for 5 years and that the truck will be worth $10,000 in 5 years. She plans to claim a depreciation tax credit using the straight-line ...
August 2, 2014

geometry
Points D, E, and F are the midpoints of sides \overline{BC}, \overline{CA}, and \overline{AB} of \triangle ABC, respectively, and \overline{CZ} is an altitude of the triangle. If \angle BAC = 71^\circ, \angle ABC = 39^\circ, and \angle BCA = 70^\circ, then what is \angle EZD+\...
July 23, 2014

geometry
Points D, E, and F are the midpoints of sides \overline{BC}, \overline{CA}, and \overline{AB} of \triangle ABC, respectively, and \overline{CZ} is an altitude of the triangle. If \angle BAC = 71^\circ, \angle ABC = 39^\circ, and \angle BCA = 70^\circ, then what is \angle EZD+\...
July 23, 2014

math
Using the shadow method, Norman finds the height of a tree as follows: He measures the shadow of the measuring stick (4ft) and the tree (20ft). He then uses similar triangles to find the tree's height. If the measuring stick is 3 feet long, how tall is the tree? 4 feet ...
July 10, 2014

math
George has been hired to paint the smith's house. He needs to be sure his ladder will reach the highest part of the house, so he decides to use the shadow method. The measuring stick is 3 ft., and tits shadow is 5 feet. The shadow of the house is 45 feet. The shadow of the...
July 10, 2014

math
e. Felix Baumgartner is a daredevil famous for breaking the sound barrier during a freefall on October 14, 2012. Aided by a weather balloon, he climbed to a height of 128,100 feet. More than 24 miles in the air, he was so high up that he could see Earth’s curvature. He ...
June 17, 2014

Physics
A seagull can fly with a speed of 12.5 m/s (relative to the air). (a) How long will it take the gull to fly from his perch 420. m east to the carcass of a dead fish floating in the water if the wind is from the east at a speed of 2.70 m/s? (b) Having eaten lunch (nicely aged, ...
May 29, 2014

intro to computers
1GB actually equals 4GB 2GB is 8GB
May 24, 2014

English
What is the subject and the verb of the sentence : A police officer stepped into the street and stopped cars .
May 21, 2014

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