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February 10, 2016

Posts by anonymous

Total # Posts: 91,485

Chemistry
-11385 J
November 17, 2015

Chemistry
If you have a 578 g of fat (tristearin) stored in your body, how much heat will be produced when it is metabolized? tristearin is C57H110O6 The chemical reaction: C57H110O6(s) + O2(g) --> CO2(g) + H2O (l) DHf: C57H110O6(s) -390.70 O2(g) 0 CO2(g) -393.5 H2O(l) -285.840 I don...
November 17, 2015

Physics
If 7.20 kg of ice at -5.00°C is added to 12.0 kg of water at 30°C, compute the final temperature.
November 17, 2015

general chemistry
Determine the concentrations of Na2CO3, Na , and CO32– in a solution prepared by dissolving 2.57 × 10–4 g Na2CO3 in 1.50 L of water. Express all three concentrations in molarity. Additionally, express the concentrations of the ionic species in parts per million...
November 17, 2015

PHYSICS
A spring is hung from the ceiling. A 0.477 -kg block is then attached to the free end of the spring. When released from rest, the block drops 0.153 m before momentarily coming to rest, after which it moves back upward. (a) What is the spring constant of the spring? (b) Find ...
November 17, 2015

PHYSICS
A block of mass m = 0.889 kg is fastened to an unstrained horizontal spring whose spring constant is k = 89.4 N/m. The block is given a displacement of +0.128 m, where the + sign indicates that the displacement is along the +x axis, and then released from rest. (a) What is the...
November 17, 2015

Algebra
WHAT IS IT
November 17, 2015

Algebra
40=30/8(26+8)
November 17, 2015

Algebra
i don't get it
November 17, 2015

Algebra
why can't anybody answer this?!?!?!?
November 17, 2015

Algebra
Can someone please answer the question, like, today
November 17, 2015

Algebra
is someone not going to answer this
November 17, 2015

Algebra
what's the answer
November 17, 2015

Algebra
A college football coach wants to know if the is a correlation between his players' leg strength and the time it takes for them to sprint 40 yards. he sets up the following test and records the data: Every day for a week, he counts how many times each player can leg press ...
November 17, 2015

Chemistry
Sorry, but I didn't write the question, my teacher did. I did deltaH/T=deltaS, and I got 17.81cal/Kmol Is the conversion factor for cal to J 4.1858? If so I used that and got 74.5 (answer 5?)
November 17, 2015

Chemistry
The standard entropy change for 1.00 moles of Ar as it evaporates at -185.7 °C (∆H°-185.7 = 1558 cal mol-1) is? 1. 17.8 J mol-1K-1 2. 87.5 J mol-1K-1 3. 15.0 J mol-1K-1 4. 46.0 J mol-1K-1 5. 74.5 J mol-1K-1 6. none of the previous answers I thought I would use ...
November 17, 2015

PHYSICS
Water flowing out of a horizontal pipe emerges through a nozzle. The radius of the pipe is 1.5 cm, and the radius of the nozzle is 0.42 cm. The speed of the water in the pipe is 0.68 m/s. Treat the water as an ideal fluid, and determine the absolute pressure of the water in ...
November 17, 2015

PHYSICS
The truck in that example is traveling at 19 m/s. The density of air is 1.29 kg/m3. By how much does the pressure inside the cargo area beneath the tarpaulin exceed the outside pressure?
November 17, 2015

PHYSICS
A duck is floating on a lake with 22% of its volume beneath the water. What is the average density of the duck?
November 17, 2015

AP Lang
epigram
November 17, 2015

scale drawing
given that the scale on a map is 1:0000 (a)calculate the actual distance between 2 points if the distance an map is 6.5cm (b)calculate the distance on the map that will represent an actual distance of 45km
November 17, 2015

U.s history
How two main constitutional compromises dealt with the various sectional differences between the states ?
November 17, 2015

Biology
What does synthesize mean in biology
November 17, 2015

math
a ball of string is 50 yards long. a shipper uses 5 yards of string to tie packages, the remaining string is then cut into 7 equal pieces. what is the lengths of each of the 7 pieces of string?
November 17, 2015

Biology
how does a plant store the carbohydrates it produces in photosynthesis
November 17, 2015

Math
Samantha has homework in five subjects tonight. She has 15 minutes of science, 20 minutes of math, 30 minutes of reading, 20 minutes of writing, and 15 minutes of geography. If her mom walked in randomly while she was doing her homework, what subject would she most likely see ...
November 17, 2015

science
C2H4O2
November 17, 2015

Pre-Algebra(please help ASAP!!!!!)
(a/4.9) = 8.33 To solve for a, multiply both sides by 4.9 On the left side the 4.9's will cancel and will leave you a. On the right side you will have 8.33x(times)4.9 Then a = 8.33x4.9
November 17, 2015

Chemistry
Fuel values, reported in units of KJ/g, are useful in comparing the efficiency of various energy sources on a mass basis. Determine the fuel value of the glucose and the tristearin. Which one, carbohydrates or fats, have the highest fuel value (and hence is the most efficient ...
November 17, 2015

chemistry
1 is D!
November 17, 2015

chem
for others facing these problems, 1.A 2.D 3.B 4.A 5.C
November 17, 2015

Social Studies (Ms. Sue) Please Proofread
Thanks! This was awesome for checking my answers and therefore i got 100%
November 17, 2015

Chemistry (Help)
-35120 exothermic?
November 17, 2015

Chemistry (Help)
-75520 exothermic?
November 17, 2015

Chemistry (Help)
Calculate the DHrxn of C57H110O6 (s) + O2(g) --> CO2(g) + H2O(l) with DHf. C57H110O6(s) -390.70 O2(g) 0 CO2(g) -393.5 H2O(l) -285.840 I balanced the equation: 2C57H110O6 (s) + 163O2(g) --> 114CO2(g) + 110H2O(l) and my work: DHrxn = [224mol(-393.5+(-285.840))] - [165mol(-...
November 17, 2015

Chemistry (Check)
or -2551.916?
November 17, 2015

Chemistry (Check)
-2816 Exothermic?
November 17, 2015

Chemistry (Check)
Calculate the DHrxn of C6H12O6 (s) + O2 (g) --> CO2 (g) + H2O (l) with DHf. C6H12O6(s) -1260.04 O2(g) 0 CO2(g) -393.5 H2O(l) -285.840 I balanced the equation: C6H12O6 (s) + 6O2 (g) --> 6CO2 (g) + 6H2O (l) and my work: DHrxn = [12mol(-393.5+(-285.840))] - [7mol(-1260.04+0...
November 17, 2015

chem
can anyone help please
November 17, 2015

chem
can anyone help please
November 17, 2015

chem
anyone know how to work out these problems?
November 17, 2015

chem
anyone know how to work out these problems?
November 17, 2015

chemistry
no one knows these :(
November 17, 2015

Algebra
15 hours overtime
November 17, 2015

chemistry
How many milliliters of water has been dispensed if the initial buret reading was 0.45 mL and the final is 20.33 mL?
November 17, 2015

Science
Okay....Thank you for clarifying!
November 17, 2015

Science
How do the circulatory system and the endocrine system interact in helping to maintain homeostasis in humans? A. The endocrine system produces hormones that are transported by the circulatory system to target cells when changes are needed. B. The circulatory system provides a ...
November 17, 2015

Health
1. D 2.false 3.A
November 17, 2015

Health
The answers are 1.d 2.false 3.a
November 17, 2015

Health
What are the answers?
November 17, 2015

math
A number cube is rolled 24 times and the results are recorded as follows: 2 ones, 10 twos, 6 threes, 3 fours, 1 five, and 2 sixes. What is the experimental probability of rolling an even number?
November 17, 2015

math
hmm CHEATER. if you look on his name 90% of posts is cheater wow. hypocret
November 17, 2015

college algebra
To get the reciprocal of a function switch x & y values. F(x) = (3x-5)/(x-2) becomes (x-2)/(3x-5)
November 16, 2015

Algebra
5b-7
November 16, 2015

Chemistry (Check)
Calculate the DHrxn of C57H110O6 (s) + O2(g) --> CO2(g) + H2O(l) with DHf. C57H110O6(s) -390.70 O2(g) 0 CO2(g) -393.5 H2O(l) -285.840 I balanced the equation and my work: DHrxn = [224mol(-393.5+(-285.840))] - [165mol(-390.70+0)] = -87706.66 KJ/mol Is this right? If not, ...
November 16, 2015

Chemistry (Check)
668.2 KJ/mol? Endothermic
November 16, 2015

Chemistry (Check)
Calculate the DHrxn of C6H12O6 (s) + O2 (g) --> CO2 (g) + H2O (l) with DHf. C6H12O6(s) -1260.04 O2(g) 0 CO2(g) -393.5 H2O(l) -285.840 I balanced the equation and my work: DHrxn = [14mol(-393.5+(-285.840))] - [7mol(-1260.04+0)] = -690.48 KJ/mol Is this right? If not, what ...
November 16, 2015

Chemistry (Check)
The bond strengths of the compounds HF, HCl, HBr, and HI are as follows: compound bond strength, kJ/mol HF 569.87 HCl 431.62 HBr 366.35 HI 298.407 Briefly explain why the bond strengths are ranked in this order. My guess is: They are ranked in this order because of the ...
November 16, 2015

Algebra 2
in february you have a balance of $80 in your bank account. each month yu deposit $20. let january = 1, february =2, and so on. writhe an equation for this situation. use the equation to find the balance in december
November 16, 2015

physics
A 4 . 7 kg mass weighs 39 . 95 N on the surface of a planet similar to Earth. The radius of this planet is roughly 6 . 2 × 10 6 m. Calculate the mass of of this planet. The value of the universal gravitational constant is 6 . 67259 × 10 − 11 N · m 2 / ...
November 16, 2015

Biology
Chemical Formula: 6CO2 + 12H2O + light --> C6H12O6 + 6H2O + 6O2
November 16, 2015

Biology
What is the overall chemical formula for photosynthsis? 6Co2+6H2O--->C6H12O6+6O2 Where does the energy come from in photosynthesis? From Sunlight? What is the relationship between photosynthesis and respiration Photosynthesis makes the glucose that is used in cellular ...
November 16, 2015

Spanish
Conjugate the verbs in the two sentences: 1. Mis padres me compraron un coche que __________ (ir; yo) a usar para la universidad. 2. Llamé a todas las personas que ___________ (poder) para notificarles del cambio.
November 16, 2015

Spanish
Would these phrases use the indicative or subjunctive? Explain why? Thank you!! 1) Puedes hacer lo que ______________ (querer). 2) El equipo que ____________ (ganar) el Superbowl tendrá después una entrevista con el presidente de los EEUU. 3) Ellos harán ...
November 16, 2015

algebra
the sum of 12 and twice my age
November 16, 2015

Math
Estimate using a rate per 100 19% of 288 =
November 16, 2015

Math
9.5 !! Thanks Miss Sue
November 16, 2015

Math
A group of friends went on a hiking trip. They planned to hike a total of 38 miles. They want to complete 25% of the hike by the end of the first day. About how many miles should they hike the first day?
November 16, 2015

Math
the perimeter of a rectangular garder is 100 feet the length of the garden is 8 feet longer than twice the width I need 2 linear equations
November 16, 2015

Quick English check- ms sue
Select the term that is best evoked by each of the scenarios below. Use complement, contend efficacious, emulate, engross, exploit, facile, implicit, industrious, replicate. 1. The representatives appeal for aid for the disaster victims was so effective that aid literally ...
November 16, 2015

Geography
Who were the boat people
November 16, 2015

PHYSICS
The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. A swimming polar bear climbs onto a piece of floating ice that has a volume of 5.70 m3. What is the weight of the heaviest bear that the ice can support without sinking completely beneath the water?
November 16, 2015

PHYSICS
A dentist's chair with a patient in it weighs 2180 N. The output plunger of a hydraulic system begins to lift the chair, when the dentist's foot applies a force of 73.6 N to the input piston. Neglect any height difference between the plunger and the piston. What is the...
November 16, 2015

Geography
Shared by many people?
November 16, 2015

Geography
Yes about Paris. First question : Enhance their security Second question : Peace will not prevail unless people take action to stop these tragedies from happening such as better security? Third question : Try and locate the movement of ISIS?
November 16, 2015

Geography
What should Europeans and the USA do to prevent tragedies such as this? Will healing and peace prevail or more bloodshed?What should the world do now to combat ISIS?
November 16, 2015

Physics
i don't understand how u did this??
November 16, 2015

Physics
three cars accelerate while moving in the positive direction rank the cars in order of increasing acceleration from most negative to most positive. *car 1 speeds up from 25 m/s to 35 m/s in 10 sec * car 2 speeds up from 0 to 30 m/s in 15 sec *car 3 slows down from 32 m/s to 12...
November 16, 2015

Physics
the winner of the drag race was traveling with a speed of 140.3 m/s (313.9 mph) at the end of the quarter mile course the car started from rest and had an average acceleration of 30.4 m/s^2. what was the winning time for this race v=140.3 m/s a=30.4 m/s^2 t=? 140.4/30.4= 4.6 m/s
November 16, 2015

Physics
so the answer is v= 3.96?
November 16, 2015

Physics
A chameleon extends its tongue to capture a tasty insect. The tongue accelerates at 33 m/s2 for 0.12 seconds to make the capture. what is the speed of the chameleons tongue when it grabs the insect?
November 16, 2015

Geometry
If line segment WP is an angle bisector, m<HWA=(7s+16), m<PWA=15 find s, and m<HWA.
November 16, 2015

Science
btw, all my answers were right
November 16, 2015

Science
Which of the following gases was most likely present in Earth's earliest atmosphere? A. nitrogen B. hydrogen* C. argon D. oxygen Which of the following statements accurately describes the development of the geologic time scale? A. Scientists developed the geologic time ...
November 16, 2015

Algebra
I got it already but thanks anyways Steve :)
November 16, 2015

Algebra
In a table, how do you tell if y varies directly with x and write an equation if it does?
November 16, 2015

SS
What is an example of a person in history who broke soceital rules?
November 16, 2015

SS
What is an example of a criminal or bad person in Babylon?
November 16, 2015

Science CHECK ANSWERS PLZ
Which of the following gases was most likely present in Earth's earliest atmosphere? A. nitrogen B. hydrogen* C. argon D. oxygen Which of the following statements accurately describes the development of the geologic time scale? A. Scientists developed the geologic time ...
November 16, 2015

math
3*13 - 2 - 10 + 12/2
November 16, 2015

Algebra
assuming the same tax bracket, etc. (3030/5200)*(57/52)
November 16, 2015

algebra
100
November 16, 2015

Physics
a boy runs 10m/sec at 10m/sec and he walks for 30 sec at 10m/sec what is the average of speed of the boy ? A\ 5M/S B/ 20M/S C/15M/S D/10M/S E/ None
November 16, 2015

10th grade
Ravi resigned----------illness
November 16, 2015

math
Could someone please check my answer to this question: Evaluate the expression [(x^n)(y) + (y^n)] ^-2n for x=-2, y=3 and n=-1 =[(x^-1)(y)+(y^-1)]^-2(-1) =[(x^-1)(y)+(y^-1)]^2 =[(x^-2)(y^2)+(y^-2) =y^2/x^2(y^2) =3^2/(-2)^2(3^2) =9/4(9) =9/36 =1/4
November 15, 2015

Algebra 1
Evaluate: 1 5 9 × 1 8 Give your answer in its simplest form.
November 15, 2015

Physics HELP
How would I solve this problem? A plane travels 4300 m at an angle of 49 degrees to the ground, then changes direction and travels 6500 m at an angle of 21 degrees to the ground. What is the magnitude and direction of the planes tot displacement?
November 15, 2015

SOC 320
Which of the following is among the Courts’ means of influencing implementation? (Points : 1) Judicial review of administrative rules and rule making Direct oversight of executive branch agencies Routine judicial review of appropriations Intervening in policy cases they ...
November 15, 2015

Chemistry
I'm confused. Why do you use log and why do you do 1/H2SO4? I found this equation in our textbook: Ecell=Eocell-(RT/nFl)nQ When I use that equation I get 2.00, when I use the equation you've given I get 2.05. I know it's a small difference but why? Thank you
November 15, 2015

Chemistry
Given: PbSO4 + 2e− Pb + SO42− E° = -0.356 V PbO2 + 4H+ + SO42− + 2e− PbSO4 + 2H2O E° = 1.685 V Determine the cell voltage of the lead storage battery when the concentration of sulfuric acid is 4.00 M. Where do I start, thank you
November 15, 2015

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