Thursday

August 21, 2014

August 21, 2014

Total # Posts: 917

**Chemistry**

To what Celsius temperature must 44.5 mL of methane gas at 43.0°C be changed so the volume will be 63.0 mL? Assume the pressure and the amount of gas are held constant. I have already tried T1V1=T2V2
*May 2, 2010*

**Chemistry**

NH3(g) + O2(g) NO2(g) + H2O(g) Consider the above unbalanced equation. What volume of NH3 at 950. mm Hg and 33.5°C is needed to react with 190. mL of O2 at 485 mm Hg and 143°C? =? mL
*May 2, 2010*

**Chemistry**

To what Celsius temperature must 44.5 mL of methane gas at 43.0°C be changed so the volume will be 63.0 mL? Assume the pressure and the amount of gas are held constant.
*May 2, 2010*

**Chemistry**

Which of the following increase the melting point of an ionic compound? decreased charge on the ions increased size of the ions increased charge on the ions decreased size of the ions increased amount of the compound
*April 28, 2010*

**Chemistry**

What effect does lowering the pressure on the surface of water have on the boiling point? It increases the boiling point It decreases the boiling point the boiling point remains the same
*April 28, 2010*

**Chemistry **

As ice melts at standard pressure, its temperature remains at 0°C until it has completely melted. Its potential energy: increases decreases remains the same
*April 28, 2010*

**calculus**

Consider the infinite series of the form: (+/-)3(+/-)1(+/-)(1/3)(+/-)(1/9)(+/-)(1/27)(+/-)...(+/-)(1/3^n)(+/-)... (A) Find x and y from: x(</=)(+/-)3(+/-)1(+/-)(1/3)(+/-)...(</=)y.
*April 24, 2010*

**calculus**

Consider the infinite series of the form: (+/-)3(+/-)1(+/-)(1/3)(+/-)(1/9)(+/-)(1/27)(+/-)...(+/-)(1/3^n)(+/-)... (A) Find x and y from: x(</=)(+/-)3(+/-)1(+/-)(1/3)(+/-)...(</=)y. (B) Can you choose the signs to make the series diverge? (C) Can you choose the signs to ...
*April 22, 2010*

**calculus**

Consider the infinite series of the form: (+/-)3(+/-)1(+/-)(1/3)(+/-)(1/9)(+/-)(1/27)(+/-)...(+/-)(1/3^n)(+/-)... (A) Find x and y from: x(</=)(+/-)3(+/-)1(+/-)(1/3)(+/-)...(</=)y. (B) Can you choose the signs to make the series diverge? (C) Can you choose the signs to ...
*April 22, 2010*

**Calculus**

Consider the infinite series of the form: (+/-)3(+/-)1(+/-)(1/3)(+/-)(1/9)(+/-)(1/27)(+/-)...(+/-)(1/3^n)(+/-)... (A) Find x and y from: x(</=)(+/-)3(+/-)1(+/-)(1/3)(+/-)...(</=)y. (B) Can you choose the signs to make the series diverge? (C) Can you choose the signs to ...
*April 21, 2010*

**12th grade agebra 2**

for the first one, all real roots are 2, -2, and the square root of 2. i'm not sure of the second one. hope this helps.
*April 20, 2010*

**Chemistry**

How do I decide whether something is polar or not?
*April 15, 2010*

**Chemistry**

When the Kelvin temperature of an enclosed gas doubles, the particles of the gas ____. a) strike the walls of the container with less force b) move faster c) decrease in volume d) decrease in average kinetic energy
*April 14, 2010*

**Chemistry**

nevermind, the temperature increase
*April 14, 2010*

**Chemistry**

What happens to the temperature of a gas when it is compressed?
*April 14, 2010*

**math 221**

1. Using Excel, find the z-score that corresponds to the following Confidence Levels: a. 80% b. 85% c. 92% d. 97% 2. Using Excel, find the t-score that corresponds to the following Confidence Levels and Sample Sizes: a. 95% with n = 25 b. 96% with n = 15 c. 97% with n = 21 d. ...
*April 6, 2010*

**chemistry**

For each trial, enter the amount of heat gained by the chemical system of ammonium nitrate, qrxn. The specific heat of water is 4.184 J/goC. Report your answer using 4 digits. The information given is: Trial # Tiwater Tf Masswater #1: 21.2 10.8 24.990 #2: 20.8 9.50 25.000 #3: ...
*April 6, 2010*

**Chemistry**

Which of the following electron configurations represent an excited state? 1s22s22p1 1s22s22p63s2 1s1 1s22s12p63s1 1s12s22p63p3 1s22s22p23d1 1s22s22p64s1
*April 1, 2010*

**math**

your first step is to isolate b. to do that, you minus 17 from both sides. so you'd get 5b = (8-17). (do the work yourself, it's pretty simple). so you have 5b still, and your goal is to isoalte b. so you'd divide 5b by 5. and if you do that, you have to divide the...
*March 31, 2010*

**Statistics for Decision**

2.22/84 3.53/84 4 57/84=0.6785 5.18/84 6.18/21 8. indepent high cal have 18/84 and high fiber have 53/84
*March 27, 2010*

**Statistics for Decision**

Calorie Level Fiber Type High Calorie Low Calorie Totals High Fiber 18 4 22 Medium Fiber 23 6 29 Low Fiber 12 21 33 Totals 53 31 84 1. What is the probability that the cereal would be high calorie? In other words, what is P(high calorie)? 2. What is the probability that the ...
*March 27, 2010*

**Chemistry**

If 20.00mL of a solution that contains oxalate ion requires 10.00mL of 0.020M MnO4- solution in a titration, what was the molarity of the oxalate solution? 5C2O42- + 2MnO4- + 12H+ --> 2Mn2+ + 10CO2 + 8 H2O
*March 23, 2010*

**Chemistry**

How do I find the emperical formula of 16.9% Fe3+ 39.7% C2O42- 43.4% H2O
*March 23, 2010*

**4th Grade Math**

Ms. Ross's class has 24 students.2/3 of her students have brown hair.The rest have blonde hair.How many students have blonde hair?
*March 23, 2010*

**3rd grade math**

Write an expression that equals 468 that includes a combination that adds up to 100
*March 16, 2010*

**chemistry**

How many miles of sodium hydrogen carbonate would be needed to react with 150.0 g of sulferic acid?
*March 10, 2010*

**Chemistry**

If 15.0 kJ are released when 1.40 g of F2 reacts with an excess of SiH4, complete the thermochemical equation below. SiH4(g) + 2 F2(g) SiF4(g) + 4 HF(g) ÄHrxn = ?kJ
*March 8, 2010*

**Chemistry**

Several of my classmates and I use this website. I use my own name.
*March 8, 2010*

**Chemistry**

94.0 g of a metal at 88.0°C are added to 55.0 g of water at 26.0°C. When the system reaches constant temperature, the temperature is 39.3°C. What is the specific heat of the metal? The specific heat of water is 4.184 J/g·°C.
*March 8, 2010*

**Chemistry**

What is the specific heat of a substance if 35.5 kJ are required to raise the temperature of 345 g of the substance from 69.0°C to 150.0°C?
*March 8, 2010*

**Chemistry**

Copper has a specific heat of 0.387 J/g·°C. How much energy is required to raise the temperature of 140. g of copper from 17.5°C to 154.0°C?
*March 8, 2010*

**Chemistry**

A 5.80 g sample of SiH4 and an excess of oxygen were placed in a reaction container surrounded by 3.40 kg of water. The initial temperature of the water was 14.10°C. At the end of the reaction, the temperature of the water was 48.90°C. Assume the heat was completely ...
*March 8, 2010*

**math cont.**

i forgot one of the questions to the math question i just asked. calculate your yearly salary after six years as a veterinary tech.
*March 2, 2010*

**math**

what? i did. ive already done this question twice and my teacher said i did it wrong both times
*March 2, 2010*

**math**

at the start of your school year as a veterinary tech, you receive a raise of $750. you expect to receive the same raise every year. your total yearly salary after your first raise is $18,000 per year write an equation that models your total salary (s) in terms of the number ...
*March 2, 2010*

**Linear Equations**

Solve the following system of equations by the substitution method. 8x = 2y + 5 3x = y + 7
*March 2, 2010*

**college**

TiO2(s) + H2(g) Ti(s) + H2O(g) (a) Consider the unbalanced equation above. What is the maximum mass of titanium that can be produced when 2.65 g of TiO2 and 3.40 g H2 react? = ?g Ti (b)Assume the reaction in part (a) goes to completion. Calculate the mass of excess reactant. =?g
*February 28, 2010*

**precalculus**

The question is...find the radian measure of the central angle of a circle of radius r that intercepts an arc of length s. Then it gives the radius r of 27 inches and an arc length s of 6 inches. How do I do that?
*February 28, 2010*

**calculus**

what he said
*February 21, 2010*

**3rd grade math**

13
*February 18, 2010*

**English 101, Politics**

Thank you for that. I will continue trying to figure this out.
*February 16, 2010*

**English 101, Politics**

I would like a starting point, I really don't understand the question. I am not good with politics at all. I've been researching it but I'm still at a loss.
*February 16, 2010*

**English 101, Politics**

This is for my English 101 class, I have to write a 3 page paper. Why did the recent history of liberalism and neoconservatism curiously mirror and parallel the modern African American civil rights movement?
*February 16, 2010*

**1st grade**

it breathes it eats it grows it moves it reproduces
*February 16, 2010*

**geometry**

X lies in the interior of <abc Name the two angles contained in <abc
*February 9, 2010*

**physics**

If you are initially 1.50 km [E] of home and 0.65 hours later you are 0.75 km [N 45 degrees E] of home, what is your change in displacement?
*February 8, 2010*

**physics**

If you are initially 1.50 km [E] of home and 0.65 hours later you are 0.75 km [N 45 degrees E] of home, what is your change in displacement?
*February 8, 2010*

**writing**

in acts of resistance what is the tone of scarry introductory paragraph?
*February 3, 2010*

**6th grade math**

(D)
*February 1, 2010*

**Finite**

Assume that the producer has 8 skits and 5 commercials available. In how many ways can the producer create a television show?
*January 24, 2010*

**science**

does an animal cell have a cell wall
*January 21, 2010*

**science**

parts of a animal cell
*January 21, 2010*

**maths**

what number is 40 more than 454?
*January 19, 2010*

**social studies**

What is the country that lies north of the eastern Canada?
*January 18, 2010*

**social studies**

what happens in the ending of the movie seasbiscuit and how does it reflect the struggles of the depression?
*January 12, 2010*

**music**

who was the lyrist of joesph and the technicolour dreamcoat
*January 4, 2010*

**Technology**

what is a insulator?
*January 2, 2010*

**Technology **

what is a conductor?
*January 2, 2010*

**Technology**

What is a electron?
*January 2, 2010*

**Literature**

I am taking the exact same class, and they sound perfect! (:
*December 29, 2009*

**Hospitality: food, shelter, and fun away from home**

Compare the “8 Things to Look for in a Franchise” on the Web page with the “Seven Basic Questions for a Prospective Franchisee” in the textbook. Discuss in detail the similarities and differences between the two.
*December 11, 2009*

**chemistry**

THANKS SO MUCH DRBOB!! I GOT THE CORRECT ANSWER!!!!!
*November 28, 2009*

**chemistry**

determine the percent by mass of all the elements in the compound magnesium sulfate heptahydrate? how do i start this? mg is 24.31 sulfur is 32.07 and 7 hydrogens for heptahydrate? add them up? 63.436. if i am doing this correctly what do i do next?
*November 28, 2009*

**chemistry**

yes paul i am. im having a blast trying to do this extra credit. how its it going for you?
*November 28, 2009*

**chemistry**

disregard the last post i meade. i submitted it and i realized i forget to add the87.56 into the work! Ba 137.33 2Cl 70.9 2O 32 = 240.23 2Cl 70.9/240.23 Xs 100= 29.51% 0.2951 X 87.56mg= 25.84mgCl 25.84 Xs 1mol/35.45= 0.729 X 6.022= 4.39 X 10 to the 23 power. is that correct?
*November 28, 2009*

**chemistry**

ok. so i have: Ba 137.33 2Cl 70.9 2O 32 = 240.23 2Cl 70.9/240.23 Xs 100= 29.51% i need mg not g so i convert it 29.51 in mg =0.02951 correct? if so i have 0.02951mgCl X 1mol/35.45 X 6.022 X 10 to the 23= 0.00083244 X 6.022= 0.005 X 10 to the 23 power. am i on the correct path?
*November 28, 2009*

**chemistry**

how many atoms of chlorine are ther in 87.56 milligrams of barium chlorite?
*November 28, 2009*

**Math**

Find the amount of money in an account after 12 years if $1000 is deposited at 5% annual interest compounded quarterly.
*November 20, 2009*

**5th grade Language**

yes Mrs. Sues answers are corecct I got an A+
*November 5, 2009*

**physics**

0.06
*November 4, 2009*

**Sixth Grade Social Studies**

Need help with finding the state capitals of the middle and southern colonies from the 1600's
*November 3, 2009*

**Histor**

What were low points in King Henry VIII's reign?
*October 27, 2009*

**math**

what kind of music do barbers and tailors play together?
*October 23, 2009*

**science**

The density of a 1.0 M solution of NaCl is 1.04 g/mL and its specific heat, c, is 3.06 J/C*g. How much heat is absorbed by 3.14 mL of this solution if the temperature rises from 18.6C to 29.7C? q=m*C*delta T (1.04g)(3.06)(11.1K)=35.32 is that right?
*October 22, 2009*

**science**

thanks
*October 22, 2009*

**science**

To What change of state does the term fusion apply? Gas??
*October 22, 2009*

**College Physics**

A boy of mass 64.1 kg is rescued from a hotel fire by leaping into a firefighters' net. The window from which he leapt was 7 m above the net. The firefighters lower their arms as he lands in the net so that he is brought to a complete stop in a time of 0.40 s. Ignore air ...
*October 15, 2009*

**College Physics**

The graph shows the force exerted on an object versus the position of that object along the x-axis. The force has no components other than along the x-axis. If z is an increment of 25, then what is the work done by the force on the object as the object is displaced from 0 to 3...
*October 13, 2009*

**College Physics**

A spring fixed at one end is compressed from its relaxed position by a distance of 0.20 m. See the graph of the applied external force, Fx, versus the position, x, of the spring. (a) Find the work done by the external force in compressing the spring 0.17 m starting from its ...
*October 13, 2009*

**College Physics**

A record company executive is on his way to a TV interview and is carrying a promotional CD in his briefcase. The mass of the briefcase and its contents is 4.00 kg. The executive realizes that he is going to be late. Starting from rest, he starts to run, reaching a speed of 2....
*October 13, 2009*

**6th grade**

How do you know that the particles are moving in a solid?
*October 12, 2009*

**Medical Physics**

A block is acted on by a force that varies as (2.8*10^4 N/m)x for 0<=x<=.21m, and then remains constant at 5880 N for larger x. 1. How much work does the force do on the block in moving it from x = 0 to x = 0.30 {m}? 2. How much work does the force do on the block in ...
*October 2, 2009*

**science**

3. Makes bubbles when added to vingar
*October 2, 2009*

**Physics**

Jenny are there any numbers for forces?
*October 2, 2009*

**french**

so maybe imperfect? Je n'avais pas..?
*October 2, 2009*

**french**

Can someone help me with this sentence? Quelquefois, je me suis senti inadéquate parce que je n'ai pas acquis beaucoup d'expérience en dessin. my teacher circled "n'ai pas" i do not know what is wrong with it:(
*October 2, 2009*

**College Physics**

A cyclist starts from rest and pedals so that the wheels make 7.7 revolutions in the first 5.1 s. What is the angular acceleration of the wheels (assumed constant)?
*September 25, 2009*

**College Physics**

A turntable reaches an angular speed of 33.3 rpm, in 2.0 s, starting from rest. (a) Assuming the angular acceleration is constant, what is its magnitude? (b) How many revolutions does the turntable make during this time interval?
*September 25, 2009*

**College Physics**

A wheel's uniform angular acceleration is constant. Initially its angular velocity is zero. During the first 1.0 s time interval, it rotates through an angle of 86.0°. a) Through what angle does it rotate during the next 1.0 s time interval? (b) Through what angle ...
*September 25, 2009*

**College Physics**

A pendulum is 0.50 m long and the bob has a mass of 1.0 kg. At the bottom of its swing, the bob's speed is 1.6 m/s. What is the tension in the string at the bottom of the swing?
*September 25, 2009*

**College Physics**

A spy satellite is in circular orbit around Earth. It makes one revolution in 5.99 hours. (a) How high above Earth's surface is the satellite? (b) What is the satellite's acceleration?
*September 25, 2009*

**US History**

that isn't helpful at all sra!
*September 24, 2009*

**Physics**

A bobcat weighing 74.5 N jumps out of a tree. (Assume that "up" is the positive direction.) (b) What is the drag force on the bobcat when it falls at 70% of its terminal velocity? (d) What is the acceleration when it falls at 70% of its terminal velocity?
*September 23, 2009*

**Physics**

A paratrooper with a fully loaded pack has a mass of 119 kg. The force due to air resistance on him when falling with an unopened parachute has magnitude FD = bv^2 where b = 0.13 (N·s^2)/m^2. The force of air resistance acting on him is 516N up. (b) What is his ...
*September 23, 2009*

**Physics**

A car is speeding up and has an instantaneous speed of 14.2 m/s when a stopwatch reads 9.1 s. It has a constant acceleration of 1.8 m/s^2. (a) What change in speed occurs between t = 9.1 s and t = 12.6 s? (b) What is the speed when the stopwatch reads 12.6 s?
*September 23, 2009*

**Physics**

Two blocks are connected by a lightweight, flexible cord that passes over a frictionless pulley. If m1 is 3.4 kg and m2 is 9.1 kg, and block 2 is initially at rest 130 cm above the floor, how long does it take block 2 to reach the floor?
*September 23, 2009*

**Pre-Algebra**

I know the answers but I don't know the equations to match it to plz help 1. 33 5x+3 2. -26 9x+10 (that's all I know) 3. 40 4. -69 5.-16 6.12 7.-82 8.33 9.72 10.-43 11.99 12.-73 13.76 14.181
*September 15, 2009*

**5th grade**

Make a product to find each product of 2 x 2500
*September 9, 2009*

**Pre Calc**

Solve the equation on the interval [0,2pi). cos2x=(*2/2)
*August 27, 2009*

**Pre Calc**

Solve the equation on the interval [0,2pi). cos2x=(*2/2)
*August 26, 2009*

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