Thursday

September 29, 2016
Total # Posts: 1,444

**Chemistry**

given 9.5 g of KBr (molar mass is 119 g/mol) dissolved in water to make a 175 mL solution, what would the molarity be?

*May 24, 2012*

**Chemistry**

thanks a bunch!

*May 24, 2012*

**Chemistry**

2 Fe (s) + 6 HCl (aq) -> 2 FeCL3 (s) + 3 H2 (g) Given 16 g of HCl and 10g Fe react with how many grams of FeCl3 are produced (limiting reactant)?

*May 24, 2012*

**Chemistry**

thank you!

*May 24, 2012*

**Chemistry**

2 Fe (s) + 6 HCl (aq) -> 2 FeCL3 (s) + 3 H2 (g) What is the mole ratio of Fe reacted to FeCl3 produced?

*May 24, 2012*

**Chemistry**

thanks!

*May 24, 2012*

**Chemistry**

2 Fe (s) + 6 HCl (aq) -> 2 FeCL3 (s) + 3 H2 (g) How many liters of H2 would be formed if 200 g of Fe completely reacted with HCl at 40 degrees Celsius and 1.5 atm?

*May 24, 2012*

**Chemistry**

thank you!

*May 24, 2012*

**Chemistry**

2 Fe (s) + 6 HCl (aq) -> 2 FeCL3 (s) + 3 H2 (g) 12.2 grams of Fe reacts with excess of HCl. how many grams of FeCl3 will be produced?

*May 24, 2012*

**Chemistry**

thank you!

*May 22, 2012*

**Chemistry**

a 2.0M solution of Hbr will have what pH?

*May 22, 2012*

**Chemistry**

ooh okay, thank you DrBob222!

*May 22, 2012*

**Chemistry**

HBrO3 has a Ka of 3.6 x 10^-6. What is the pH of a 2.0M solution?

*May 22, 2012*

**Chemistry**

thank you so much!

*May 22, 2012*

**Chemistry**

Propanoic acid has a Ka of 1.3 x 10^-5. What is the % ionization in a 3.0M solution?

*May 22, 2012*

**Chemistry**

thank you!!

*May 22, 2012*

**Chemistry**

The PH of a 1.3M HF solution is 3.18. What % of the acid ionized?

*May 22, 2012*

**Math**

the probability of a team winning is 65%. The team played four games in a row. What is the probability of winning 4 games in a row?

*May 10, 2012*

**geography**

why communities have an interest in the urban growth and decline

*April 30, 2012*

**college Calculus Help!**

i got it, it correct answer is f'(x)=-x^5.

*April 17, 2012*

**college Calculus Help!**

but thanks

*April 17, 2012*

**college Calculus Help!**

what about f ' (x)? i did with (1/6)(x^6-21^6) but its wrong f(x)=∫(21,x) t^5 f'(x)= x^5 i font know

*April 17, 2012*

**college Calculus Help!**

If f(x)= ∫(21,x) t^5 dt then f'(x). my answer was 1/6 (21^6-x^6) it said it's wrong.

*April 17, 2012*

**math**

Sonya spent 3/8 of her money and then had $15.00 left. How much money did Sonya originally have?

*April 16, 2012*

**COLLEGE CALCULUS. HELP!**

Evaluate the definite integral ∫(0,2) (x-1)^25 dx.. thats how i got stuck u=x-1, then du=dx =∫(0,2) u^25du =(1/26)u^26. i dont know what to do with integral (2,0)..

*April 14, 2012*

**Algebra**

0.16 times 360.

*April 9, 2012*

**ms. sue**

How did you know it was me?

*March 31, 2012*

**writing**

i just had a question. if i write down an essay a sort one can someone read it and tell me if its in the level that i want it to be in and/or give me some suggestions on how to improve it? Please answer because im applying for a program and need all the help i can get.

*March 28, 2012*

**Math**

The scale on a map is 1/4 inch = 25 miles. The Distance Between two cities on the map is 2 and 3/4 inches. What is the Actual Distance , in miles, between the two cities?

*March 22, 2012*

**Algebra2**

How do I solve this rational exponent equation? (2x)^1/2 = x - 4 Thanks in advance ^^

*March 13, 2012*

**Alg2**

How how I write the first six terms of this sequence? Please be detailed and thanks in advance :) f(n)= 3/-m

*March 12, 2012*

**Physics 111 PLEASE HELP ASAP**

A 37.5-kg child swings in a swing supported by two chains, each 3.05 m long. The tension in each chain at the lowest point is 433 N. the force of the seat on the child is 498.5 N. b)Find the force exerted by the seat on the child at the lowest point. (Ignore the mass of the ...

*March 12, 2012*

**PHYSICS 111**

A 37.5-kg child swings in a swing supported by two chains, each 3.05 m long. The tension in each chain at the lowest point is 433 N. the force of the seat on the child is 498.5 N. b)Find the force exerted by the seat on the child at the lowest point. (Ignore the mass of the ...

*March 11, 2012*

**Calculus ap**

i got the answer right thanks

*March 2, 2012*

**Calculus ap**

Use implicit differentiation to find the slope of the tangent line to the curve XY^3 + XY = 5 at the point (3,2) .

*March 2, 2012*

**Geography**

What are factors leading to growth in lagos: Geographical Economic Political

*March 1, 2012*

**chemistry**

why is it necessary to add phosphoric acid in addition to sulphuric acid in the dissolving of a steel sample?

*February 28, 2012*

**Physics 2**

@ Megan ---------------------- Torque = (# of turns)(current)(Area)((magnetic field)(sin(angle))) Area = (circumference)^2 / (4π) circumference is distance around the edge of a circle. Torque = (1)(7.94)(((4.52 x 10^-2)^2)/(4π))(8.04 sin(90)) =(7.94)(((4.52 x 10^-2)^...

*February 25, 2012*

**Physics 2**

Torque = (the number of turns)(current)(Area)((magnetic field)(sin(angle))) Area = π × r^2 the angle is the angle between the normal to the plane of the coil and the magnetic field. Torque = (45)(40)(π(5.1)^2)(0.49 sin(90)) Maximum torque occurs when the ...

*February 25, 2012*

**Chemistry**

How many grams of carbon dioxide are produced in C3H8+5O2 -> 3CO2+4H2O

*February 24, 2012*

**ALGEBRA**

I don't really know but I think 10 cars weren't blue or red

*February 23, 2012*

**algebra**

Hi Dear Jiskha team, I have Algebra homework and I will need some help. The homework is following: Suppose you are using a computer to draw a face on a coordinate plane. The eyes are at (–3, 3) and (3, 3). The tip of the nose is at the origin. To make a smiling mouth, you...

*February 22, 2012*

**spanish**

how do you say i care about others than myself?

*February 21, 2012*

**Physics**

A banked circular highway curve is designed for traffic moving at 65 km/h. The radius of the curve is 207 m. Traffic is moving along the highway at 43 km/h on a rainy day. What is the minimum coefficient of friction between tires and road that will allow cars to negotiate the ...

*February 13, 2012*

**Math**

1/6 is .16666(repeating) in decimal form. To make it a percent, multiply by 100. So it's 16.67%.

*February 13, 2012*

**5th grade math**

Try dividing it into sections, finding the area of each section, then adding them all together. Many shapes will resolve into triangles, squares, and circles. (For example, the ears would be small triangles.)

*February 13, 2012*

**Math(Algebra)**

How would you set this problem up and work it: The difference between two numbers is 16. Three times the larger number is seven times the smaller. What are the numbers? This one also: The differnce between two numbers is 18. The sum of twice the smaller number and three times ...

*February 7, 2012*

**Music Appreciation**

Thank you

*February 4, 2012*

**Music Appreciation**

Short mood pieces of no set form are called _____. a. tone poems b. preludes c. overtures d. mazurkas B?

*February 4, 2012*

**Math 543**

The number 3136 is the sum of the first how many odd whole numbers?

*January 22, 2012*

**Math 543**

The number 3136 is the sum of the first how many odd whole numbers?

*January 22, 2012*

**problem solve in math**

At a teacher’s conference on the first Saturday in November in Palm Springs, CA, 100 teachers meet in a large room. Each teacher shakes the hand of every teacher in the room, except for his or her own hand. How many total handshakes were made?

*January 22, 2012*

**Geometry**

Which does not represent a possible intersection of a line and a right cylinder? a. 3 points b. 2 points c. 1 point d. a segment A?

*January 7, 2012*

**Geometry**

Thank you!

*January 6, 2012*

**Geometry**

How many points in a plane are in the locus of all points equidistant from two parallel lines in the plane? a.0 b.1 c.2 d.infinitely many D?

*January 6, 2012*

**Math**

Im not too sure how to find the x-intercept & y-intercept for a sstandard form question when it looks like this: 4x-12=0 If someone could explain this too me that would be awesome. thanks :)

*January 6, 2012*

**Geometry**

Thanks!

*January 5, 2012*

**Geometry**

Describe the locus of all points, in space, that are 5 cm from line p. a. a line, 5 cm from line p. b. a pair of parallel lines, each parallel to and 5 cm from line p. c. a sphere with a radius of 5 cm. d. a cylinder with a radius of 5 cm. D?

*January 5, 2012*

**GEOMETRY ONE QUESTION PLEASE HELP?!!**

Name the smallest angle of triangle ABC, segment AC is 9, segment CB is 10, and segment AB is 8. <C <A Two angles are the same size and smaller than the third <B Thank you :) Your help is appreciated!

*January 2, 2012*

**GEOMETRY ONE QUESTION!? THANK YOU!**

THANK YOU!!!!!!!!!!!!!!!!!!!!!! ^_^

*December 29, 2011*

**GEOMETRY ONE QUESTION!? THANK YOU!**

In triangle ABC, centroid D is on the median line segment AM. AD=x+5 and DM=2x-1. Find AM. Thank You ^_^!!!!!

*December 29, 2011*

**Geometry**

The perimeter of triangle ABC is 29 meters. Line segment AD bisects angle A. Find AB and AC. CD=5cm, DB=4 cm.(triangle angle bisector theorem)

*December 28, 2011*

**physical science**

15 km/hr

*December 18, 2011*

**FINANCE**

You deposit $2,000 in an account that pays 8% interest compounded semiannually. After 4 years, the interest rate is increased to 8.28% compounded quarterly. What will be the value of the account after 4 more years? (Do not round until the final answer. Then, round to the ...

*December 7, 2011*

**earth**

LAVA

*December 4, 2011*

**science**

what is the weather degrees for november 20 through november 25 in las vegas

*November 27, 2011*

**Physics**

i do not know

*November 27, 2011*

**2 grade math**

yes you are but you are have to write like this 0.66% .

*November 24, 2011*

**Alg. II/Trig**

If m and n are real numbers, i^2=-1, and (m-n)-4i=7+ni, what is the value of m?

*November 18, 2011*

**Alg. II**

Simplify. Identify any x-values for which the expression is undefined. 1. (4x-8)/(x^2-2x) 2. (8x-4)/(2x^2+9x-5)

*November 17, 2011*

**Geometry**

Name the property of inequality that justifies the following statement: If BC+DE<FG+DE, then BC<FG. Subtraction Property of Inequality?

*November 12, 2011*

**science (PLEASE HELP)**

Why is condensation on the beaker resulted from burning methane a chemical reaction?

*November 3, 2011*

**trig derivatives**

How do I find the derivative of 6 + 8cosx?

*October 27, 2011*

**Trig/Algebra II**

(3+√2)/(3-√2) is equivalent to: a. (11+6√2)/ 7 b. (11-6√2)/ 7 c. 11/7 d. 7/ (11+6√2)

*October 27, 2011*

**physics**

an experimental jetplane just after takeoff climbs with a speed of 500km/hr at an angle of 37 degrees with the horizontal. At what rate is the plane gaining altitude?

*October 24, 2011*

**integrated algebra**

Graph 2y = -1 + 2

*October 23, 2011*

**math**

Is 2,340 divisible by 90? How do you know?

*October 11, 2011*

**World History**

Thanks!

*October 10, 2011*

**World History**

Since independence, in most Latin American countries a. elected governments have been overthrown by a military coup'etat. b. elected governments have continued to function peacefully. c. Socialist governments have come to power in most countries. d. Communist governments ...

*October 10, 2011*

**World History**

Thank you!

*October 10, 2011*

**World History**

A major problem in relations between Israel and the Arab states was the a. resettlement of Palestinian refugees. b. failure to develop trade agreements. c. status of Jerusalem as an open city. d. level of influence Great Britain still exercised. A?

*October 10, 2011*

**World History**

Palace at knossos

*October 7, 2011*

**arithmetic**

1/3 and 1/4 and 1/8 and 1/5 and 10 and 1. Find the original number

*September 28, 2011*

**chemistry**

194.

*September 27, 2011*

**geography**

sea of japan

*September 19, 2011*

**Physics**

227

*September 18, 2011*

**Algebra**

John and two friends rent a canoe at a park. Each person must rent a life jacket. If the bill for the rental of the canoe and life jackets is 41, for how many hours did they rent the canoe?

*September 15, 2011*

**Algebra**

Use an equation to solve the problem. John and two friends rent a canoe at a park. Each person must rent a life jacket. If the bill for the rental of the canoe and life jackets is 41, for how many hours did they rent the canoe?

*September 15, 2011*

**Math**

I don't get what l and w would be

*September 15, 2011*

**Math**

WHAT IS THE PERIMETER OF A SQUARE WHOSE VERTICLES ARE A(-4,-3), B(-5,1), C(-1,2), AND D(0,-2)?

*September 15, 2011*

**Math**

sorry i meant 13

*September 15, 2011*

**Math**

TRY DIVIDING 65 BY 15

*September 15, 2011*

**World History**

Thanks again!

*September 14, 2011*

**World History**

People who proposed complete democracy for Great Britain were called a. anarchists b. Tories c. Chartists d. Conservatives C?

*September 14, 2011*

**World History**

Thank you!

*September 14, 2011*

**World History**

The Roosevelt Corollary extended the Monroe Doctrine by declaring that a. European powers might collect Latin American debts by force. b. European powers must give up their colonies in Latin America. c. the United States could intervene in Latin America countries if it seemed...

*September 14, 2011*

**chemistry**

The osmotic pressure of a solution containing 5.00 mg of an unknown protein per 10 mL of solution was 2.73 torr at 25 °C. Find the molar mass of the unknown protein.

*September 10, 2011*

**Math **

what kind of math journals, essays, & projects you guys do in 7th grade math??? i'm really curious i saw the grading policy 2 my skool website here is the grading policy for math DISTRICT GRADING POLICY MATHEMATICS -70% FORMAL ASSESSMENTS (Tests, Quizzes) -15% ALTERNATIVE ...

*September 5, 2011*

**Parenthetical Citations**

How detailed do I need to be with my parenthetical citations? I am using a website as a source with many different webpages. It is confusing because I don't know how detailed I need to be with web addresses. I must have 15 different webpages for the same site. Can I just ...

*September 2, 2011*

**Modern History**

Thanks :)

*August 25, 2011*