# Posts by Lily

Total # Posts: 1,561

**Chem, HELP plz**

Complete and balance the following reaction, given that elemental rubidium reacts with elemental sulfur to form Rb2S?

**Chemistry**

thanks!

**Chemistry**

A sample of O2 (g) occupies a volume of 3.0 L at 700 mmHg, calculate its volume at 375mmHg.

**Chemistry**

A gas consists of a collection of small particles traveling in straight-line motion and obeying Newton's Laws. The molecules in a gas occupy no volume (that is, they are points). Collisions between molecules are perfectly elastic (that is, no energy is gained or lost ...

**Chemistry**

Give the major ideas of the kinetic molecular theory.

**Chemistry**

thank you

**Chemistry**

Convert from 5.6 moles of Cl2 (g) to liters at STP

**Chemistry**

thank you!

**Chemistry**

Explain what causes pressure in a container.

**Chemistry**

What happens to the volume of a latex balloon when it flies to high altitudes (assuming temperature is somewhat constant)?

**Chemistry**

thank you!

**Chemistry**

Using the ideas of the kinetic molecular theory, explain why it would be very dangerous to put a can of hairspray in a hot oven.

**Chemistry**

thank you so much!

**Chemistry**

Describe the density and compressibility of solids versus liquids and gases.

**Chemistry**

thanks!

**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?

**Chemistry**

thanks a bunch!

**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)?

**Chemistry**

thank you!

**Chemistry**

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

**Chemistry**

thanks!

**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?

**Chemistry**

thank you!

**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?

**Chemistry**

thank you!

**Chemistry**

a 2.0M solution of Hbr will have what pH?

**Chemistry**

ooh okay, thank you DrBob222!

**Chemistry**

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

**Chemistry**

thank you so much!

**Chemistry**

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

**Chemistry**

thank you!!

**Chemistry**

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

**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?

**geography**

why communities have an interest in the urban growth and decline

**college Calculus Help!**

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

**college Calculus Help!**

but thanks

**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

**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.

**math**

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

**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 don't know what to do with integral (2,0)..

**Algebra**

0.16 times 360.

**ms. sue**

How did you know it was me?

**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.

**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?

**world history**

omg shut up. ^^^^ and this website is no help

**Algebra2**

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

**Alg2**

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

**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 ...

**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 ...

**Calculus ap**

i got the answer right thanks

**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) .

**Geography**

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

**chemistry**

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

**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)^...

**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 ...

**Chemistry**

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

**ALGEBRA**

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

**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...

**spanish**

how do you say i care about others than myself?

**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 ...

**Math**

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

**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.)

**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 ...

**Music Appreciation**

Thank you

**Music Appreciation**

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

**Math 543**

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

**Math 543**

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

**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?

**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?

**Geometry**

Thank you!

**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?

**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 :)

**Geometry**

Thanks!

**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?

**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!

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

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

**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 ^_^!!!!!

**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)

**physical science**

15 km/hr

**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 ...

**earth**

LAVA

**science**

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

**Physics**

i do not know

**2 grade math**

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

**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?

**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)

**Geometry**

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

**science (PLEASE HELP)**

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

**trig derivatives**

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

**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)

**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?

**integrated algebra**

Graph 2y = -1 + 2

**math**

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

**World History**

Thanks!

**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 ...

**World History**

Thank you!

**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?

**World History**

Palace at knossos

**science**

A

**arithmetic**

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