Friday
August 29, 2014

Posts by derek


Total # Posts: 241

Chemistry
Just out of curiosity, how would you figure out the delta g if you didn't know the delta h? I don't think it is possible, is it? And also, can you explain how you knew it was exothermic?
May 27, 2014

Chemistry
When magnesium hydrogen carbonate reacts with sulfuric acid, would you consider that an exothermic reaction because it forms CO2 (gas)?
May 27, 2014

math
(4.3 x 10-8) (1.5 x 109) Compute and write in scientific notation
March 17, 2014

Math
If a metal bar at a temperature of 20 degree celcius is dropped in boiling water how long will it take for the bar to reach 98 celcius at a rate of 2 degrees per second
February 21, 2014

math
$8000 is shared between 3 schools in the ratio of 2:3:5, how much will each school get?
February 9, 2014

chemistry
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
February 5, 2014

chemistry
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
February 5, 2014

chemistry
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
February 5, 2014

chemistry
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
February 5, 2014

chemistry
I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
February 5, 2014

Algebra, 0110 HELP!
Including 5% sales tax, an inn charges $210.00 per night. Find the nightly cost at the inn before tax is added. (a) Write an equation to model the problem. Let x represent the nightly cost before tax. (b) Solve the equation to find nightly cost before tax. (Note: Your answer ...
September 7, 2013

Math
Denise took a total of 80 calls on her shift at work today. Of those 80 calls, 55% were resolved, 15% escalated to a supervisor, and 10% required that a technician be sent out to the customer's house. What is the total number of calls that Denise resolved on her shift ...
August 20, 2013

physics
After sliding down a snow-covered hill on an inner tube, Ashley is coasting across a level snowfield at a constant velocity of +2.8 m/s. Miranda runs after her at a velocity of +4.8 m/s and hops on the inner tube. How fast do the two of them slide across the snow together on ...
June 30, 2013

Math (HELP PLZ)
Thanks, I wasn't so sure at first, I guess I just forgot
June 3, 2013

Math (HELP PLZ)
The glass in Lee’s window needs replacing. It is 30 inches wide and 24 inches long. What is the area (A) of the glass Lee should buy? A. A = (2 × 30) + (2 × 24) = 108 in. B. A = 30 × 24 = 720 in2 C. A = 2 × (30 + 24) = 108 in2 D. A = 30 + 24 = 54 in.
June 3, 2013

comp
Which of the following contains a pronoun error? (Points : 2) Neither Jane Austen nor Mary Shelley is known for their poetry. As the curtain rises, everyone in the audience settles into his or her seat and waits for the play to begin. The book sale that is held in the spring ...
May 28, 2013

Math
A fence is 20 ft long. it has posts at each end and at every four feet along its length. how many fence posts are there? Draw a picture.
May 20, 2013

math
what is the y-intercept of the line of 35.00 + 8.00x if the slope is 8
April 26, 2013

Computer (Visual Basic)
You are in the process of selecting the BackColors and ForeColors for you new application. When you originally learned to use Visual Studio, you were only aware of one of the palettes that was available to you, but your developer colleague informs you that you have more ...
April 9, 2013

Math
Distributive property 9x
March 31, 2013

Advanced Algebra
Write the equation for the depreciation of the value of your car for t years at 14% per year.
March 28, 2013

launguage
Read the following excerpt from “All Together Now”: What can parents do? We can put our faith in young people as a positive force. I have yet to find a racist baby. Babies come into the world as blank as slates and, with their beautiful innocence, see others not as ...
March 12, 2013

Programming (Visual Basic)
Im seem to be having trouble with this Exercise. Would you mind helping me please? How do i do this Visual Basic program? Instructions say: Fix the following code: Dim dblRegularPay As Double Dim dblOvertimePay As Double intRegularPay = 783.87 intOvertimePay = 105.92 lbl ....
March 5, 2013

algebra
Is v=s2 a quadratic relation?
March 3, 2013

Physics
Roughly how high could a 340 K copper ball lift itself if it could transform all of its thermal energy into work? Assume specific heat for copper equal to 386 J/kg·K.
March 3, 2013

Physics
Roughly how high could a 340 K copper ball lift itself if it could transform all of its thermal energy into work? Assume specific heat for copper equal to 386 J/kg·K.
March 3, 2013

Math
2/3/3= A. 2/9 B. 1/9 C. 1 D. 2
March 2, 2013

Math
a banner requires 1 1/2 sections of plastic. How many banners can be made from 12 sections of plastics? A.7 B.8 C.9 D.15
March 2, 2013

English
so is it sell or bargain?
March 2, 2013

English
So your saying the answer is Bargain?
March 2, 2013

English
buying and selling
March 2, 2013

English
Are you sure thats correct because someone told me the answer is Sell or Bargain
March 2, 2013

English
Which of the following words is different from the others? A. Sell B. Trade C. Barter D. Bargain
March 2, 2013

health
A client comes in and asks for a pregnancy test. What do you do?
February 22, 2013

hardware
A driver is a blank that interacts with a particular device or special (frequently optional) kind of software?
February 20, 2013

Computer (Hardware Support)
What types of devices use USB ports?
January 17, 2013

Finance
A company wishes to issues bonds with a coupon rate of 5%. The company wishes to raise 100 million dollars net of commissions (5% of total sales). Each bond has a face value of $1,000 and matures in 10 years. Interest is to be paid semi-annually. Using the following conditions...
December 12, 2012

physics
An object is located 16.8 cm in front of a convex mirror, the image being 11.5 cm behind the mirror. A second object, twice as tall as the first one, is placed in front of the mirror, but at a different location. The image of this second object has the same height as the other...
November 14, 2012

physics
Two parallel plate capacitors are identical, except that one of them is empty and the other contains a material with a dielectric constant of 4.2 in the space between the plates. The empty capacitor is connected between the terminals of an ac generator that has a fixed ...
November 13, 2012

Calculus
An open top bos with a square base is to be constructed from 192 sq ft of material. What should be the dimensions of the box if the volume is to be a maximum? What is the maximum volume?
October 29, 2012

Physics
need help with this problem :/ A circular coil (980 turns, radius = 0.078 m) is rotating in a uniform magnetic field. At t = 0 s, the normal to the coil is perpendicular to the magnetic field. At t = 0.027 s, the normal makes an angle of 45o with the field because the coil has...
October 28, 2012

physic
A charge of -2.73 μC is fixed in place. From a horizontal distance of 0.0465 m, a particle of mass 9.50 x 10-3 kg and charge -9.56 μC is fired with an initial speed of 97.2 m/s directly toward the fixed charge. What is the distance of closest approach?
October 11, 2012

MATH URGENT
I MEAN AN EVEN SORRY!
September 11, 2012

MATH URGENT
SRRY I MEANT AN EVEN INTEGER HAS BEEN REMOVED LOL
September 11, 2012

MATH URGENT
AN INTEGER IS RANDOMLY SELECTED AND PERMANENTLY REMOVED FROM THE SET OF 100 INTEGERS (1,2,3,...100). WHAT IS THE MINIMUM NUMBER OF TIMES THIS REMOVAL PROCEDURE WILL HAVE TO BE DONE TO GUARANTEE THAT AN INTEGER HAS BEEN REMOVED?
September 11, 2012

math *IMPORTANT
oops 0 is 0 111111 its 6 tally marks
September 10, 2012

math *IMPORTANT
HENRY PROGRAMMED A CALCULATOR TO RANDOMLY DISPLAY A DIGIT FROM 0 THROUGH 9. THE RESULTS OF THE FIRST 50 DISPLAYS ARE SHOWN ON THE TABLE BELOW. WHAT IS THE POSITIVE DIFFERENCE BETWEEN THE THEORETICAL PROBABILITY AND EXPERIMENTAL PROBABILITY FOR GETTING A 9 IF EACH DIGIT HAS AN ...
September 10, 2012

MATH *IMPORTANT
well i get that but i just dont c what the answer is becuase it takes forever to do this problem u have to use numbers ubtil you have them all. i am in mathcounts and it is totally competition i cant be up doing a problem like that isnt there a possible way to do it faster and...
September 10, 2012

Calculus
Find the maximum area of a rectangle that lies above the x axis and below y=9-x^2
June 27, 2012

Calculus
Find the maximum and minimum product of 2 numbers who sum is 5
June 27, 2012

Calculus
If y= (x^2+20)/(x-4) Find all critical Numbers. After get f' i got the answer -5/4. What did i do wrong or is that the critical number?
June 27, 2012

math
If y= (x^2+20)/(x-4) Find all critical Numbers. After get f' i got the answer -5/4. What did i do wrong or is that the critical number?
June 27, 2012

recreation travel
Sorry I was not more clear. The airline has stated that A container can be carried but must not exceed 158cm in total. eg. LxWxH The container I need to take is a tube that must be 118cm long. I need to know what diameter the tube can be to meet the overall total of 158cm. Thanks
June 14, 2012

recreation travel
I need a tube that is 118cm long. The total allowance is 158cm by Multiplying the LxWxH. What circumference can the tube be.
June 14, 2012

Physics
If you could reach absolute zero then? A) The system falls into quantum ground state B) The system will have an entropy of zero C) Molecules will not overlap, D) Particles will continue to move E) There is still zero-point energy Are all of these true?
June 1, 2012

college math
Celsius= 5/9*(Fahrenheit-32) Celsius= 5/9*(72-32) Celsius= 22.22 degrees celsius
May 29, 2012

Geometry
The height of a parallelogram is 10 feet more than its base. If the area of the parallelogram is 120 square feet, find its base and height.
April 18, 2012

Geometry
How many different integer values of n satisfy the inequality 1/13 < 2/n < 1/10? F. 1 G. 2 H. 3 J. 4 K. 5
April 16, 2012

math
238
April 16, 2012

Physics 30
A point charge q=+4.7nC is placed at each corner of an equilateral triangle with sides of 0.21m in length. a) What is the magnitude of the electric field at the midpoint of the three side of the triangle? b) Is the magnitude of the electric field at the centre of the triangle ...
April 5, 2012

statistics
0.4108 0.6892
March 29, 2012

Chemistry
How much heat is required to warm 1.50 kg of sand from 20.0 C to 100.0 C?
March 20, 2012

science
A proton (mass m = 1.67 multiplied by 10-27 kg) is being accelerated along a straight line at 2.2 multiplied by 1015 m/s2 in a machine. The proton has an initial speed of 2.4 multiplied by 107 m/s and travels 3.8 cm. (a) What is its speed? m/s (b) What is the increase in its ...
January 20, 2012

algebra
sorry that answer was wrong tis is the right one 3x(43+82/3)*(879/615=y78)
January 20, 2012

algebra
54x3y
January 20, 2012

geometry
4 square root 56y8
January 19, 2012

calculus
Solve the following differential equation: f"(x)=sinx, x(0)=0, x'(0)=1
December 6, 2011

psychology
In psychology, the study of personality focuses on: change. stability. external factors. learned factors
November 25, 2011

geometry
a large square has sides of 24 units, midpoints of its sides are connected to create a smaller square. what is the area of the smaller square
October 30, 2011

Math
1,5,10,10,5,1
October 27, 2011

Math
1,10,10,1
October 27, 2011

3rd grade math
venn diagram circle a numbers:838,848,868,878 circle b numbers:403,509,600,702 What number would you write where the circles overlap?
October 27, 2011

Physics
A projectile is fired from the origin with an initial velocity V₁=100m/s at an angle θ₁=30⁰. Another is fired from a point on the x-axis at a distance x₀=60m from the origin with initial velocity V₂=80m/s at an angle of θ₂. It is ...
September 22, 2011

BUSINESS
1.Nordstrom creates an open atmosphere, in which every associate’s sales figures are made available to everyone else. Explain the positive impacts.While this is intended to foster creative tension, how might it lead to unhealthy destruction?
September 15, 2011

MIS
what is WCA?
September 10, 2011

Linear programming
Yes, thank you so much.
June 26, 2011

Linear programming
Riverside Oil Company in eastern Kentucky produces regular and supreme gasoline. Each barrel of regular sells for $21 and must have an octane rating of at least 90. Each barrel of supreme sells for $25 and must have an octane rating of at least 97. Each of these types of ...
June 26, 2011

EMT-Basic
the answer i would say has to be reassuring him that you are going to take good care of his wife.
June 25, 2011

Chemistry
When 0.5963g of a sample containing NaNO2 and some inert material is allowed to react with excess HSO3NH2, the volume of N2 gas produced is measured. The volume of N2 gas corrected to 298.15K and 100kPa is calculated to be 0.146L. Find the mass percent of NaNO2 in the sample ...
May 25, 2011

Chemistry
NaNO2 + HSO3NH2 = NaHSO4 + H2O + N2
May 25, 2011

psychology
Actually I got it. Its psychoanalytic, humanistic, and behavior. So the question is describe three psychological models of mental illness (psychoanalytic, humanistic, and behavior) include etiological explanation and the principle therapeutic modality that evolved from the model
May 17, 2011

psychology
The problem is I can't find the name of each models
May 17, 2011

psychology
None of the links explain three models of mental illness
May 17, 2011

psychology
I have trouble understanding whats the three psychological models of mental illness include etiological explanation and the principle therapeutic modality that evolved from the model. Can anyone help me? Thanks
May 17, 2011

Physics
A gatling gun fires at a rate of 2000 rounds per minute. If the bullets travel at a speed of 800m/s, how far apart are the bullets?
May 1, 2011

physics
.98
February 20, 2011

Math
4x2squared +9 \3-(8+3)
February 14, 2011

english
k
January 3, 2011

english
no thats all it gave me and om stumpted because thats the same thing i came up with
January 3, 2011

english
A transitive verb with a direct object is in the ___ voice. a.active. b.passive. c.subjunctive.
January 3, 2011

english
they sort of help but there to long for me to read right now
January 3, 2011

english
The verbs to do , to have , and to be are verbs that can be used 1.as a main verb. 2.as an auxiliary verb. 3.as either a main verb or an 4.auxiliary verb.
January 3, 2011

chemistry
UGH! I've been working on this problem for about an hour now for my test tomorrow at WMU. No luck. =( My guess? Impossible. =P
November 15, 2010

physics
A 102.0 N grocery cart is pushed 13.0 m by a shopper who exerts a constant horizontal force of 54.0 N. If all frictional forces are neglected and the cart starts from rest, what is its final speed?
November 12, 2010

physics
a 0.1 kg mass is suspended at rest from a spring near the Earth's surface, the distance that the spring is stretched is measured to be 1.0 cm. What is the spring constant of the spring (remember the MKS units)? A mass of 2 kg is attached to a spring with constant 18 N/m. ...
November 10, 2010

physics
1. An object of mass m and initial speed v0 sliding on a horizontal frictionless surface encounters a frictionless ramp. To what vertical height will the object rise before coming to rest?
November 3, 2010

physics
An object of mass m=2kg travels up an incline to a vertical height of 3m. What is the work done on the object by gravity?
November 3, 2010

physics
Will the work done by friction on an object that moves through a positive displacement be positive of negative??? negative
November 3, 2010

physics
An object of mass m=2kg travels up an incline to a vertical height of 3m. What is the work done on the object by gravity?
November 3, 2010

Physics
0.17 kg point mass moving on a frictionless horizontal surface is attached to a rubber band whose other end is fixed at point P. The rubber band exerts a force F = bx toward P, where x is the length of the rubber band and b is an unknown constant. The mass moves along the ...
November 3, 2010

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