Tuesday

May 3, 2016
Total # Posts: 1,383

**Chemistry**

When a clear aqueous solution of calcium chloride (CaCl2) is mixed with a clear aqueous solution of sodium carbonate (Na2CO3), a white solid precipitate forms. What happens to the mass of the mixture after the solid precipitate forms? Choose the best answer. Mass decreases ...
*September 25, 2012*

**Physics**

A driver in a car traveling at a speed of 76 km/h sees a cat 109 m away on the road. How long will it take for the car to acceler- ate uniformly to a stop in exactly 106 m? Answer in units of s
*September 25, 2012*

**Physics**

A car enters the freeway with a speed of 6.7 m/s and accelerates uniformly for 3.0 km in 3.8 min. How fast is the car moving after this time? Answer in units of m/s
*September 25, 2012*

**world history**

I need help answering this can anyone help or give an example thank you Identify a region near where you live and explain what sets it apart as a region. I live in California
*September 23, 2012*

**hce **

i need to find 3 pet peeves and 2 solutions for each. the probelm is that i cant find any wsolutions. ive found so many diffeerent pet peeves but no soltions. PLZ HELP ME:(
*September 15, 2012*

**Chemistry**

what's the balanced equation?
*September 12, 2012*

**Chemistry**

when 10.0 ml of a .20 M Cu (NO3)2 solution is mixed with 15.0 mL of 0.20M NaOH, what is the theoretical yield (grams) of copper (II) hydroxide?
*September 12, 2012*

**physics**

75N
*September 10, 2012*

**5th grade religion**

this is such a hard question
*September 5, 2012*

**physic**

what is the answer?
*September 5, 2012*

**math math math**

what are the formulas for the area and circumfrence of a circle
*August 21, 2012*

**math math math**

is it 40
*August 21, 2012*

**math math math**

24 is 60% of what numberr
*August 21, 2012*

**math math math**

35 is what percent of 200
*August 21, 2012*

**help?**

please
*August 21, 2012*

**math refreshers**

18 is what percent of 72? how to work this?
*August 21, 2012*

**math refreshers**

this one was supposed to be (-2/21) divided by (-2/15) show work please
*August 20, 2012*

**math refreshers**

show work please 6/25 divided by (-3/5) =?
*August 20, 2012*

**math refreshers**

show work please 6/25 divided by (-3/5) =?
*August 20, 2012*

**math refreshers**

2.4(-0.7)=? i think its -1.68
*August 20, 2012*

**math refreshers**

okay thats what i did thx im just checkin my math stuff for school
*August 20, 2012*

**math refreshers**

23.1 + (-9.81) = ?
*August 20, 2012*

**math refreshers**

oh okay thx
*August 20, 2012*

**math refreshers**

-9 - 22= ? -9 + 22 = 13? is that right
*August 20, 2012*

**business law**

A Fortune 500 CFO admits to having deliberately treated $4 billion in operating expenses as assets, thereby allowing the corporation to show profits instead of losses. The auditor never detected this. The corporation’s stock drops 95 percent and bond covenants related to ...
*June 3, 2012*

**chemistry**

calculate how much strontium fluoride will dissolve in 1L of water given Ksp= 2.5x10^-9 at 25 degree celsius
*June 3, 2012*

**math**

After several drinks, a person has a blood alcohol level of 220 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 4 hours
*June 3, 2012*

**Chem, HELP plz**

Complete and balance the following reaction, given that elemental rubidium reacts with elemental sulfur to form Rb2S?
*May 29, 2012*

**Chemistry**

thanks!
*May 24, 2012*

**Chemistry**

A sample of O2 (g) occupies a volume of 3.0 L at 700 mmHg, calculate its volume at 375mmHg.
*May 24, 2012*

**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 ...
*May 24, 2012*

**Chemistry**

Give the major ideas of the kinetic molecular theory.
*May 24, 2012*

**Chemistry**

thank you
*May 24, 2012*

**Chemistry**

Convert from 5.6 moles of Cl2 (g) to liters at STP
*May 24, 2012*

**Chemistry**

thank you!
*May 24, 2012*

**Chemistry**

Explain what causes pressure in a container.
*May 24, 2012*

**Chemistry**

What happens to the volume of a latex balloon when it flies to high altitudes (assuming temperature is somewhat constant)?
*May 24, 2012*

**Chemistry**

thank you!
*May 24, 2012*

**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.
*May 24, 2012*

**Chemistry**

thank you so much!
*May 24, 2012*

**Chemistry**

Describe the density and compressibility of solids versus liquids and gases.
*May 24, 2012*

**Chemistry**

thanks!
*May 24, 2012*

**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*