Saturday
February 13, 2016

Posts by DANNY

Total # Posts: 813

chemistry
ΔS is positive for which one of the following reactions? Ag+(aq) + Cl- (aq) = AgCl(s) N2(g) + 3H2(g) = 2NH3(g) CaO(s) + CO2(g) = CaCO3(s) 2SO3(g) = 2SO2(g) + O2(g) H2O(l) = H2O(s)
February 7, 2015

chemistry
Suppose you have a reaction that has a ΔH of +80 kJ and a ΔS of 215 J/K. At what temperature will this reaction change from being not spontaneous to spontaneous? 31 C 99 C -18 C 25 C 53 C
February 7, 2015

Physics
huihillll
February 5, 2015

chemistry
Given the following values of ΔH, ΔS and T, calculate ΔG (in kJ). The values are: ΔH = 23.0 kJ, ΔS = 125 J/K, and temperature = 85.0 C.
February 5, 2015

chemistry
Given the following values of ΔH, ΔS and T, calculate ΔG (in kJ). The values are: ΔH = -95.0 kJ, ΔS = 217 J/K, and temperature = 160 C.
February 3, 2015

chemistry
How many core electrons are there in a ground state phosphorus atom?
February 3, 2015

chemistry
Given: Equation #1: 4NH3(g) + 5O2(g) = 4NO(g) + 6H2O; ΔH of reaction = -1170 kJ Equation #2: 4NH3(g) + 3O2(g) = 2N2(g) + 6H2O; ΔH of reaction = -1530 kJ Then what is the ΔH of reaction for: N2(g) + O2(g) = 2NO(g)? Enter a numerical value below and be sure to ...
January 31, 2015

chemistry
Calcium carbide (CaC2) reacts with water to form acetylene (C2H2) gas and calcium hydroxide (Ca(OH)2). If the ΔH for: CaC2(s) + 2H2O(l) = Ca(OH)2(s) + C2H2(g) is -127 kJ, then what is the enthalpy of formation for calcium carbide? The ΔH of formation for H2O(l), Ca(...
January 31, 2015

chemistry
Suppose that your morning shower is 7 minutes long and uses 4 gallons of water per minute that is a nice 102 F in temperature. How much energy (kJ) must be used to heat the water for your shower if the water coming into your house is at 60 F? The heat capacity of water is 4....
January 31, 2015

chemistry
Suppose you add 92 ml of dilute acid to 46 ml of water. Both the water and acid were at room temperature (22 C) before being mixed. The temperature of the solution increased to 39 C. How much energy (in kJ) was released by the dissolution of the acid if the specific heat ...
January 31, 2015

chemistry
In the reaction below, ΔH°f is zero for ___________. Ni(s) + 2CO(g) + 2PF3(g) = Ni(CO)2(PF3)2(l) Ni(s) CO(g) Ni(CO)2(PF3)2(l) both CO(g) and PF3(g) PF3(g)
January 31, 2015

chemistry
The enthalpy change for the following reaction is -483.6 kJ: 2H2(g) + O2(g) = 2H2O(g) Therefore, the enthalpy change for the following reaction is _______ kJ: 4H2(g) + 2O2(g) = 4H2O(g)
January 31, 2015

chemistry
What is the specific heat capacity of ethanol (C 2H 6O) if a 18.3 g sample increased 12.3 C upon the addition of 553.0 J? The units are J/(g ·K)
January 31, 2015

chemistry
The radiator in your car uses either water or ethylene glycol (anti-freeze) to remove heat from the engine and dissipate it to the outside air. If the water recirculation rate is 17.0 kg per minute of water and the water temperature leaving the engine and entering the ...
January 31, 2015

chem
What is the specific heat capacity of aluminum if a 8.4 g sample increased 21.1 C upon the addition of 159.0 J? The units are J/(g ·K). q=cpxMxT is the equation my answer i got is 401.65 is that right bec i feel thats wrong
January 29, 2015

chemistry 116
What is the specific heat capacity of aluminum if a 8.4 g sample increased 21.1 C upon the addition of 159.0 J? The units are J/(g ·K). q=cpxMxT is the equation my answer i got is 401.65 is that right bec i feel thats wrong
January 29, 2015

chem
The value for ΔH° for the reaction below is -72 kJ. How many kJ of heat are released when 1.0 mol of HBr is formed in this reaction? H2(g) + Br2(l) = 2HBr(g)
January 28, 2015

physics
What is the mass of 5.00L of pure water?
January 28, 2015

Math.
Guys, I am a witness to kid and Summer Moriarty telling you guys the wrong answers. The answers to this quick check 1.B 2.D 3.A 4.C 5.C I got a 100% on this quiz. Anonymous is right when he/she says it's B and D. The answer to number 2 is not A. Don't listen to Summer ...
January 28, 2015

physics
A typical multivitamin tablet can contain 2.00mg of vitamin B2 (riboflavin), and the RDA is 0.0030 g/day. How many such tablets should a person take each day to get the proper amount of this vitamin, assuming that he gets none from any other sources?
January 28, 2015

chemistry 116
The thermite reaction demonstrated in class requires high temperatures to start the reaction. A simple open flame is not enough to start the reaction. Once the reaction is going, then it generates enough heat to keep the reaction going. According to the literature on thermite...
January 28, 2015

chemistry 116
A 36.0 g piece of copper at 130.0 C is placed in 50.0 g of water at 20.0 C. What is the temperature (in C) of the water once the system reaches equilibrium? The molar heat capacity of copper is 24.5 J/(mol·K). The specific heat capacity of water is 4.18 J/(g·K...
January 27, 2015

chem
so i did 17000 x4.18x(86-46)=284 is that what you meant
January 27, 2015

chem
The radiator in your car uses either water or ethylene glycol (anti-freeze) to remove heat from the engine and dissipate it to the outside air. If the water recirculation rate is 17.0 kg per minute of water and the water temperature leaving the engine and entering the ...
January 27, 2015

chem
thank you i got 801.1678 is that correct
January 27, 2015

chem
If you burn 13.7 g of methane (CH4) burns in oxygen, then 686 kJ is evolved. What is the amount of heat produced per mole of methane burned?
January 27, 2015

chem
Suppose you mix hydrogen, CCl4, CO2, NO2 and fluorine gases together and allow them to reach an equilibrium temperature. Which gas has the SLOWEST average molecular (or atomic) speed?
January 26, 2015

LA
Hey everyone I just took this and the first four of his answers are correct, but the only change is that 5 is c. I got a 5/5 on this with his first 4 answers and then Austin saying it was C. Which is correct.
January 26, 2015

History
Really far north it would be september?
January 21, 2015

History
What time of year does snow come to the far north?
January 21, 2015

Math
I'm less than a hundred, the sum of my digits 17, I am a even number
January 15, 2015

Art
Was the answer B?
January 15, 2015

ART PLEASE HELP!!!!
I'm just a girl that has no friends is correct. Just got a 100
January 14, 2015

chemistry Drbobz222
How do i convert mols CaCl2 to AgCl
January 12, 2015

biology
What role does the lilac flower play in its natural ecosystem? What is its niche in the food web Are there any ecological issues surrounding the lilac flower(e.g. are its populations decreasing, is it spreading uncontrollably..)
December 23, 2014

Physics
is there a site that can also help me
December 20, 2014

Physics
my question is: What is the purpose of the resonator of a stringed instrument
December 20, 2014

Physics
What is the purpose of the resonator stringed instrument
December 20, 2014

History
July 4, 1776
December 16, 2014

chemistry
What is the final concentration of 35.7mL of 52.0% m/m solution that is diluted to 65.9ml? i am not sure how to caluclate this... but i know the formula is C1V1=C2V2
December 16, 2014

chemistry
What is the mass of 4.3 × 10 to the power of15 atoms of nickel (Ni)?
December 7, 2014

Chemistry
I don't understand.. under Sam
November 21, 2014

Chemistry
A sample of toluene, C7H8 has a mass of 74.5 g. How many moles of benzene does it contain? How many molecules does the sample contain? How many carbon atoms does it contain?
November 21, 2014

physics
The block of mass 1.43443 kg has an acceleration of 3.6 m/s^2 as shown. What is the magnitude of F? Assume the acceleration due to gravity is 9.8 m/s^2 and the surface is frictionles
November 13, 2014

science
A 5.0 kg model vehicle travelling at 14 m/s experiences a rocket boost of 85 N ( in the direction of motion) for 20 s What is the resulting speed? The answer is 350 but i dont know how to get to that answer
November 6, 2014

Chemistry
Yo mama
November 5, 2014

Math
I dont get this eather i really would like to know how people get the answer
November 5, 2014

chemistry
Complete and balance the following reactions, where applicable. If no reaction occurs, write N.R. Li + H2O ---> KCI + F2 ---> Au + HNO3 ----> CI2 + NaF ---> Li + Fe(NO3)3 --->
November 3, 2014

chemistry
Why is it important to make sure that the volume of water and the starting temperature are the same in each trial ?
October 28, 2014

physics
A boy runs 18.4 blocks North, 12.9 blocks Northeast, and 19.7 blocks West. a)Determine the length of the displacement vector that goes from the starting point to his final position. b)Determine the direction of the displacement vector. Use counterclockwise as the positive ...
October 16, 2014

physics asap!!! thank you
A boy runs 18.4 blocks North, 12.9 blocks Northeast, and 19.7 blocks West. a)Determine the length of the displacement vector that goes from the starting point to his final position. b)Determine the direction of the displacement vector. Use counterclockwise as the positive ...
October 16, 2014

physics
The pilot of an aircraft wishes to fly due west in a 50.0 km/h wind blowing toward the south. The speed of the aircraft in the absence of a wind is 228 km/h. a) How many degrees from west should the aircraft head? Let clockwise be positive. Answer in units of degrees. b) What ...
October 15, 2014

Math
Figure it out its hw so stop searching it up
October 7, 2014

Chemistry
A sprinter must average 24.0 mi/h to win a 100-m dash in 9.30 s. What is his wavelength at this speed if his mass is 84.5 kg?
October 5, 2014

physics
Cameron kicks a football with an initial vertical velocity of 18.5 m/s and an initial horizontal velocity of 18 m/s and there is a flight time of approximately 2.0 s. Will the field goal travel far enough to make the field goal from 29 m away (if the ball is high enough to ...
September 12, 2014

Physics
How long is Mayra, a ballerina, in the air when she leaps straight up with a speed of 1.23 m/s?
September 11, 2014

science pls help asap!!!
Anonymous is right with those answers. I got an 8/8 100%
June 5, 2014

science 1 question!!!
You people are some stupid as liars. Guys out there on this post right now if you want the real answers to this quick check here they are. I got a 3/4 listening to all of you guys. Your all wrong. These are the correct answers: 1. B. Believe it or not number 1 is actually B. 2...
June 5, 2014

Science
Yeah, Anonymous the key word here is instead. The question asks instead of using gasoline in car engines. Your focusing on the wrong thing. Therefore, the answer is C. Then, you have the nerve to say the first one is (a). Don't even get me started on that bull. Now you'...
May 29, 2014

Algebra 2
A+B
May 19, 2014

Algebra 2
Has to be 2.
May 19, 2014

Algebra 2
4.
May 19, 2014

Algebra 2
or 3 i think?
May 19, 2014

Algebra 2
c.
May 19, 2014

Algebra 2
Amanda surveyed 20 juniors and seniors at Delamar high school to find the number of hours per week they spend working at part-time jobs. Her results are shown below. Juniors: 20,10,20,10,15,0,0,10,20,15 Seniors: 20,20,10,10,0,0,0,10,0,10 which statement about the data is true...
May 19, 2014

Science
that's acdc your talking about. but the answers are all correct
May 19, 2014

science
The person above me that gave you the answers is right. I just got a 100%
May 14, 2014

math graphs
Mili is right.
May 5, 2014

Chemistry
If 689000 J of energy are added to 4.00 L of water at 284 K, what will the final temperature of the water be? Answer in units of K
March 19, 2014

Chemistry
Determine the specific heat of a material if a 34.7 g sample absorbed 45.2 J as it was heated from 293 K to 318 K. Answer in units of J/g · K Your answer must be within ± 2.0%
March 19, 2014

chemistry
Calculate the H3O+ concentration present in water under the following conditions. Enter your answer in scientific notation. a. [OH-] = 2.8 x 10-7 M b. [OH-] = 8.8 x 10-3 M c. [OH-] = 2.4 x 10-11 M everytime I do the problem In the calculator I get system error someone please ...
March 19, 2014

Chemistry
Calculate the pH of a solution in which a. [H3O+] = 7.8 x 10-7 M pH = b. [H3O+] = 5.1 x 10-6 M pH = c. [H3O+] = 6.1 x 10-5 M pH = d. [H3O+] = 9.3 x 10-4 M pH = I get 8.1 9.5 9.1 6.7 but its wrong please someone help!
March 19, 2014

Chem
Give the formula for the conjugate base of each acid. A.HSO4- B.H3PO4 C.HPO42- I have my answers as h2so4 h2po4 h2po4- my answrers are wrong, please help
March 18, 2014

Science
Same. I got 100% as well with the answers 1.A 2.D 3.A 4.A Good work guys!
March 3, 2014

science HELP ASAP!!!!!!!
Please, I need help with the same questions!
March 3, 2014

Help me with this math ms sue.
Mystery person is correct. I got a 100
February 27, 2014

science
Don't listen to Dave. Damon was right, the answer is D. I just took the test. I got this answer wrong thanks to Dave, but Damon is right. The answer is D, the intensity of the earthquake.
February 18, 2014

HELP! HELP! HELP! Physics
The surface density of a thin rectangle varies as: σ(x,y)= 14.0 kg/m2 + 9.00 kg/m4(x2+y2) The rectangle has a length L = 0.500 m and a width W = 1.500 m. Calculate Iz, the moment of inertia about the z-axis.
February 12, 2014

Help - physics
A block of mass 0.74 kg is suspended by a string which is wrapped so that it is at a radius of 0.060 m from the center of a pulley. The moment of inertia of the pulley is 0.0061 kg·m2. There is friction as the pulley turns. The block starts from rest, and its speed ...
February 12, 2014

Physics Help..
The surface density of a thin rectangle varies as: σ(x,y)= 14.0 kg/m2 + 9.00 kg/m4(x2+y2) The rectangle has a length L = 0.500 m and a width W = 1.500 m. Calculate Iz, the moment of inertia about the z-axis.
February 12, 2014

physics
A block of mass 0.74 kg is suspended by a string which is wrapped so that it is at a radius of 0.060 m from the center of a pulley. The moment of inertia of the pulley is 0.0061 kg·m2. There is friction as the pulley turns. The block starts from rest, and its speed ...
February 12, 2014

math --- 2 questions!
Trust these answers because I just did this and got a 5/5 100% A. 1. D 2. C 3. B 4. C 5. B
January 30, 2014

Algebra 1
I think I figured out a few of them the fist is given second is distributive third is Commutative and I am not sure about the rest
January 18, 2014

Algebra 1
Give the reason (property) for each step in the simplification. 8(a+b)-3a (8a+8b)-3a (8b+8a)-3a 8b+(8a-3a) 8b+5a
January 18, 2014

Physics
A train traveling at a speed of 110 km/h uniformly decelerates for 20 seconds. During that time it travels 450m. A) What is the acceleration? (m/s^2) B) What is its speed after deceleration? (km/h) A ANS = -.805m/s^2 B ANS = 52km s = 450m t = 20 seconds u = 110km/h*1000m/km /...
January 11, 2014

Kensignton Park
I have to find two numbers the quotient is between. 393
January 8, 2014

Physics
A train traveling at a speed of 110km/h uniformly decelerates for 20 seconds. During that time it travels 450m a) what is the acceleration m/s square? b) what is its speed after the deceleration? (km/h) Could really use some help. Thank you.
January 1, 2014

Math
100 cm = 1 meter Is 172.500 kN correct?
December 26, 2013

Math
The air pressure in a tire is 150.000 kPa. The internal surface area of the tire is 1150.000 cm^2. Determine the total force applied by the air to the tire. (Round to 3 decimal places) Answer = kN 150.000 kPa x 1000 = 150000 Nm 1150.000 cm / 100 cm = 11.5 m Force = Pressure x ...
December 26, 2013

Math
The air pressure in a tire is 800.000kPa.The internal surface area of the tire is 550.000cm^2. Determine the total force applied by the air to the tire. (Round to 3 decimal places). ANS = 44.000kN Force = Pressure x Area = 800.000kPa x 550.000 = 440000.000N = 440.000kN I keep ...
December 26, 2013

Math
Thank you very much.
December 21, 2013

Math
Where do you get the 1.18 from. Confused a little.
December 21, 2013

Math
A spring is 25 cm long when stretched. The spring was stretched by 18% of its original length. Determine the original length.
December 21, 2013

Science :)
ok so there seems to be a lot of confusion with certain answers. Particularly number 4 and 1. I think everyone is confused because you have different questions for number 4, but if you have the question on number 4 that goes something like this... 4. How does an increase in ...
December 18, 2013

calculus
Imagine making a tent in the shape of a right prism whose cross-section is an equilateral triangle (the door is on one of the triangular ends). Assume we want the volume to be 2.2 m3, to sleep two or three people. The floor of the tent is cheaper material than the rest: assume...
December 10, 2013

physics
a uniform (in density and shape) stick is balanced by one end on the ground and the other tied to a massless horizontal rope attached to a wall as shown in the figure. The stick's mass is 10kg and its length is 5m. a. Calculate the tension on the rope b. Calculate the ...
November 21, 2013

grammar
Which part of speech is the capitalized words in this sentence? Four score and seven years ago our fathers brought forth on this continent, a NEW nation, conceived in Liberty, and DEDICATED to the proposition that all men are created equal. Now we are engaged in a great civil ...
November 17, 2013

physics1111
Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a total of 14 rubs a distance of 7.50 cm each and with a frictional force averaging 30.0 N, what is the temperature increase? The mass of tissue warmed ...
November 12, 2013

Math
If p^2-q^2=12, and p+q=4 What is the value of p?
November 2, 2013

PHSYICS!
I solved it and I'm pretty sure it comes around 5.7168.
October 31, 2013

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