# AL

Most popular questions and responses by AL-
## AP Chem

MnS(s) + 2 H+ --> Mn2+ + H2S(g) At 25 C the solubility product constant, Ksp, for MnS is 5 x 10-15 and the acid dissociation constants K1 and K2 for H2S are 1 x 10-7 and 1 x 10-13, respectively. What is the equilibrium constant for the reaction represented

*asked on January 13, 2013* -
## Math fractions

Jackie loves to cook fried foods. She recorded the total amount of oil that she used each month in the table below. In January she used 3/5 of the amount of oil that she used in Fedruary. Fill in the amount of oil that Jackie used in January in the table

*asked on April 2, 2017* -
## Chemistry

A protein subunit from an enzyme is part of a research study and needs to be characterized. A total of 0.135g of this subunit was dissolved in enough water to produce 2.00 mL of solution. At 28 ∘C the osmotic pressure produced by the solution was 0.138

*asked on June 27, 2014* -
## Language Arts

4. What is the significance of the speech James Otis delivered at the last meeting of the Observers? (1 point) a)Many of the Observers considered Otis to be insane by that time. b)Otis delivered an inspirational speech about the costs of war and the

*asked on January 8, 2015* -
## CHEMISTRY

Identify the conjugate base in the following reaction. H2O (l) + HCO31- (aq) ¨ H3O+ (aq) + CO32- (aq)? Identify the Bronsted-Lowry acid in the following reaction. H2O (l) + HCO31- (aq) ¨ H3O+ (aq) + CO32- (aq)

*asked on December 3, 2014* -
## chem

carbamic acid and ammonia react to form an amide and water. What is the amide product of this reaction.

*asked on April 26, 2012* -
## chem

Aspartame, an amide, is the sweetener commonly used in diet cola.What is the carboxylic acid that is a reactant in the production of aspartame.

*asked on April 26, 2012* -
## physics

An airplane is heading due south at a speed of 734 km/h . A wind begins blowing from the southwest at a speed of 110 km/h (average). In what direction should the pilot aim the plane so that it will fly due south?

*asked on September 3, 2015* -
## chemistry

If the formula of a oxide is X2O3, what is the formula of the chloride of X? (A) XCl3 (B) XCl (C) X3Cl (D) XCl6

*asked on September 8, 2008* -
## Math

Lee walks along the edges of a rectangular pool from point A to B to C to D, a distance of 38 metres. Marina walks along the edges of the same pool from B to C to D to A, a distance of 31 metres. What is the perimeter of the pool, in metres?

*asked on October 24, 2017* -
## probability

The lifetimes of batteries are independent exponential random variables, each having parameter λ. A flashlight needs 4 batteries to work. If one has a flashlight and a stockpile of n batteries, what is the expected time that the flashlight can operate?

*asked on November 22, 2014* -
## Chemistry

When methane is combusted with excess oxygen 891 kJ of energy is produced start with 100g of methane. how much energy is produced? is this reaction endothermic or exothermic? Also provide enthalpy change for this reaction: CH4 + 2O2 (arrow)= CO2 + H2O +

*asked on October 19, 2015* -
## Chemistry

During an acid-base titration, 25 mL of NaOH 0.2 M were required to neutralize 20 mL of HCl. Calculate the pH of the solution for each: a) Before titration b) After adding 24.9 mL of NaOH c) At equivalence pt d) After adding 25. 1 mL of NaOH e) The pH of

*asked on May 10, 2014* -
## Chemistry

How many valence electrons does molybdenum have? (give only 1 answer) Go to this site and look for the electrons available in the outside shells. Click on element #42 and scroll down the menu on the left side until you come to electron configuration.

*asked on April 1, 2007* -
## Physics

Water flows from a fire truck through a hose that is 11.7 cm in diameter and has a nozzle that is 2.0 cm in diameter. The firemen stand on a hill 5.0 m above the level of the truck. When the water leaves the nozzle, it has a speed of 20.0 m/s. 1) Determine

*asked on April 10, 2017* -
## integral calculus

a rectangular plate 12ft long and 8 ft wide is submerged vertically with the longer edge in the surface of the water. Find the force on one side of the plate.

*asked on May 7, 2012* -
## Chemistry question Please help

Consider the expected conductivities of CaCl2(aq) and Ca(OH)2(aq). Which of these can be expected to have the higher conductivity. Explain your reasoning.

*asked on October 11, 2011* -
## Physics

You are walking a dog when the dog sees a cat and runs away from you. You immediately run after the dog at 5.50 m/s. You jump at an angle of 29.0° to try and catch the dog. While you are in the air the dog is able to move an extra 1.34 m away from you. If

*asked on September 27, 2016* -
## geometry

Isosceles trapezoid JKLM has legs Jk and LM and bases KL and JM. Jk=8X+5 KL=4X+1 LM=10x+4 and MJ=18X+3, area of JKLM?

*asked on February 8, 2015* -
## math

Downtown Mathville is laid out as a square grid of 9 North-South streets and 9 East-West streets (See diagram). Your apartment is located at the Southwest corner of downtown Mathville. (See point T.) Your math classroom is located in a building that is 6

*asked on October 19, 2014* -
## government

these are some questions i am having trouble with: 1. what margin is required to ratify treaties 2. where in the constitution is the ratification power described 3. what body has the power to impeach the president 4. what vote is required to impeach 5.

*asked on September 23, 2007* -
## calculus

A landscape architect wished to enclose a rectangular garden on one side by a brick wall costing $30/ft and on the other three sides by a metal fence costing $10/ft. If the area of the garden is 42 square feet, find the dimensions of the garden that

*asked on November 4, 2007* -
## math

The radius of a circular oil slick expands at a rate of 8 m/min. a. How fast is the area of the oil slick increasing when the radius is 30 m? = 480pi b.If the radius is 0 at time t=0 , how fast is the area increasing after 2 mins? i cannot get part b!

*asked on October 12, 2007* -
## Math

Use benchmark to estimate the sum, difference, or product 14/16 + 1/5 A. 2 B. 0 C. 1/2 D. 1

*asked on October 3, 2018* -
## What Is Happening to my Posts?

you have to ask a homework help question, not talk about korean foods, you cant just spam the forum Al, I was talking about botin-tang, a soup from my country; not 'spam.' I don't even eat spam... yuk :( im not talking about the food spam, spam is when you

*asked on March 31, 2007* -
## math

Consider an equilateral triangle with points located at each vertex and at each midpoint of a side. (See picture.) This problem uses the set of numbers {1, 2, 3, 4, 5, 6}. Place one number at each point. Call the sum of the three numbers along any one side

*asked on October 10, 2014* -
## chemistry

A mixture of 3.00 g of silver and copper metals was dissolved in excess nitric acid. Resulting salts, silver(I) nitrate and copper(II) nitrate, were isolated and dissolved in enough water to make 0.100 L of a solution with a total concentration of the

*asked on September 29, 2014* -
## math

A basket contained 75 brown eggs and some white eggs. Salima found that 15% of the total number of eggs were rotten. Of the rotten eggs,2/3 were white and the remaining 6 were brown. a) How many white eggs were there altogether? b) How many eggs were not

*asked on February 19, 2015* -
## Physics

7. A plastic cup, 15.0 cm in height, is filled to the rim with water. A small hole is punctured in the cup at a height 9.00 cm above the bottom of the cup and is allowing water to spew out. At what distance does the water land from the bottom of the

*asked on July 1, 2012* -
## Math

Which ratio is equivalent to 3/15 A) 1/3 B) 3/5 C) 1/5***** D) 15/3

*asked on November 13, 2018* -
## physics

If you pull one end of the rope 1.4 downward with a 46- force, find the height you can lift a 170- load.

*asked on October 9, 2018* -
## us history

You have OREGON FEVER! On your voyage west, there are many things you must plan for if you plan to make it to your final destination. Choose one of the following to complete and submit to Mrs. Sterling through webmail for extra credit. • You are

*asked on April 15, 2016* -
## Physics URGENT!!!

At a certain location, the horizontal component of the earth's magnetic field is 2.5 x 10^-5 T, due north. A proton moves eastward with just the right speed, so the magnetic force on it balances its weight. Find the speed of the proton.

*asked on November 9, 2007* -
## math

At 8 A.M., Dylan and his neighbor, Mickey, drove in their cars to a city that was 240 mi. away from their neighborhood. When Dylan reached the city, Mickey had 40 mi. to go. He finally completed the trip 48 minutes later. a) How long did it take Mickey to

*asked on February 26, 2015* -
## math

A woman exerts a horizontal force of 2 pounds on a box as she pushes it up a ramp that is 6 feet long and inclined at an angle of 30 degrees above the horizontal. how do you find the work on the box?

*asked on January 27, 2009* -
## Chemistry

NH3(g) + 202(g) = HNO3(aq) +H2O (l) Is this reaction a combination, decomposition, single replacement, double replacment or other? Also is it redox or non redox?

*asked on May 3, 2010* -
## algebra

The equation f(x) = 4x2 − 16x + 9 represents a parabola. What is the vertex of the parabola? (2, −7) ( −2, 57) (4, 9) ( −4, −137)

*asked on April 11, 2016* -
## Physics

ANY ANSWERS WILL HELP! THANKS! 1. Isolated points of electric charge are called ____. 4b. ____ was the American physicist who first measured this fundamental unit of charge. 5. This type of electrification occurs when the charging rod touches an

*asked on December 17, 2013* -
## Chemistry

List Sn , Sn2+, Sn4+ in order of decreasing ionization energy

*asked on October 18, 2015* -
## Math

A number and its absolute value are equal. If you subtract 2 from the number, the new number and its absolute value are not equal. What do you know about this number? What is a possible number that satisfies these conditions?

*asked on October 12, 2014* -
## Chemistry

2Fe2O3 + 6C + 3O2 -> 4Fe + 6Co2 What mass of Fe2O3 present is needed to produce 15 of iron? what mass of CO2 is released when 15g of iron is produced?

*asked on October 18, 2015* -
## math

Aaron earns $1.50 for every video game he sells. When he sells one carton of 30 video games, he earns an additional $10. What is the minimum number of video games he has to sell in order to earn $450?

*asked on March 5, 2015* -
## Physics

6) The relationship between force and acceleration is given by Newton’s 2nd Law: Fnet = ma. In this case this becomes: !@#$%^&p – Ff = ma.

*asked on October 30, 2013* -
## basic chem lab question

what is the mass of a typical 50 ml glass beaker in grams

*asked on September 21, 2008* -
## chemistry

how much oxygen is produced by heating 20g of mercury (II) oxide if 18.6g of mercury is produced?

*asked on March 24, 2008* -
## Physics

An airplane traveling at 200 mph in a direction of 40 degrees north of east encounters a wind blowing east at 50.0 mph. Find the velocity of the plane measured from the ground.

*asked on September 26, 2017* -
## Calculus

a hyperbola passing through (8,6) consists of all points whose distance from the origin is a constant more than its distance from the point (5,2). find the slope of the tangent line to the hyperbola at (8,6).

*asked on October 26, 2014* -
## chemistry

A volume of 25.0 mL of 0.100 M CH3CO2H is titrated with 0.100 M NaOH. What is the pH after the addition of 12.5 mL of NaOH? (Ka for CH3CO2H = 1.8 x 10-5)

*asked on May 31, 2011* -
## Chem

What pairs of ions produce similar colours in the flame test? Use your periodic table of elements to explain the reason for this. I think it's the different groups of elements, but I'm not sure.

*asked on February 17, 2015* -
## Geometry

The circumference of a circle is 20 pi cm. Find diameter, radius, and area of the disk, the length of an arc of 90 angle and area of a 90 angle sector. Answer in terms of pi. d= ___ r= _____, disk area= _______ arc length =______, sector area =________

*asked on February 26, 2015* -
## Chemistry

When ice melts, it absorbs 0.33 per gram. How much ice is required to cool a 11.0 drink from 75 to 37, if the heat capacity of the drink is 4.18 ? (Assume that the heat transfer is 100 efficient.)

*asked on February 5, 2010* -
## Math

Kelly's scores on the first three tests in her physics class are 79, 84, and 68. Determine all scores on the fourth test that will yield an average test score of at least 80.

*asked on May 24, 2014* -
## Grade 8 Math

How can you use the measures of the interior angles of regular polygons to show that a platonic solid cannot be made from regular polygons that have more than five sides?

*asked on June 2, 2009* -
## Chemistry

Element X has the highest first electron affinity in its period; the ground state electron configuration of it's most common ion is [Kr] 5s^2 4d^10 5p^6 a Element Y is the second largest element in it's period; it's valence electrons are in orbital(s) that

*asked on October 18, 2015* -
## math

Let AB be a diameter of a circular track. Tom starts from point A running clockwise on the track. At the same time Jerry starts from Point B running counterclockwise on the track. Each person runs at a constant speed. They first meet after Tom has run 200

*asked on April 26, 2010* -
## chem.

How much heat would be required to warm Earth's oceans by 1.0 degree celsius ? Assume that the volume of Earth's oceans is 137x10^7 km^3 and that the density of seawater is 1.03 g/cm^3. Also assume that the heat capacity of seawater is the same as that of

*asked on February 5, 2010* -
## physics

A 50 kg skater pushed by a friend accelerates 5 m/sec. How much force did the friend apply?

*asked on November 26, 2007* -
## physics

PLEASE HELP! When Babe Ruth hit a homer over the 10 m -high right-field fence 80 m from home plate, roughly what was the minimum speed of the ball when it left the bat? Assume the ball was hit 1.2 m above the ground and its path initially made a 39 ∘

*asked on September 8, 2015* -
## MATH

a rodeo performer spins a lasso in a circle perpendicular to the ground. the circle has a diameter of 118cm. she starts with the knot at the lowest point which is at 90 cm above the ground, she spins the lasso and .5 seconds later the knot is at the

*asked on January 16, 2015* -
## Geometry

if plane angle DAB = (67 + 4x) degrees, than wht is plane angle DAB?

*asked on February 10, 2011* -
## chemistry

how many grams of AgNO3 would need to be dissolved in 1 liter, 500mL, and 100mL in order to make a 1M solution? need to show work and answers are in grams....????

*asked on July 16, 2010* -
## english

Which of these is a simple sentence and why? 1) Karen and David arrived at the airport at 3:35 p.pm and took a taxi to their hotel. 2) I went to the airport, but I was too late to meet them. 3) When I realized I was too late, I called David's cell phone

*asked on September 7, 2009* -
## 8th grade science

infer why deposits form in the steam vents of irons in some parts of the country. thank you.

*asked on March 26, 2009* -
## Physics

(1) A virtual image -7 cm tall and 17 cm away from a mirror is created by an object 7 cm away from a mirror. How tall is the object? What kind of mirror created the image? What is its focal length? (2) If a 1.75 m tall man is looking at a plane mirror from

*asked on February 19, 2009* -
## math

A horizontal clothesline is tied between 2 poles, 14 meters apart. When a mass of 4 kilograms is tied to the middle of the clothesline, it sags a distance of 5 meters. What is the magnitude of the tension on the ends of the clothesline? Use gravitational

*asked on January 27, 2009* -
## physics

a thin wire with linear charge density _ is surrounded by a conducting cylindrical shell. (a) If the electric field must be zero inside a conductor, is the electric field due to the wire shielded from extending beyond the conducting shell? (b) Find the

*asked on September 23, 2008* -
## english

i have to right a paper about music and identity, you just pick a song and tell a story it can be about anything im just really cant think of anything im into country music btw

*asked on September 8, 2008* -
## Physics

A brick weighs 15.0 N and is resting on the ground. Its dimensions are 0.203 m 0.0890 m 0.0570 m. A number of the bricks are then stacked on top of this one. What is the smallest number of whole bricks (including the one on the ground) that could be used,

*asked on November 25, 2007* -
## math

The sum of the reciprocals of two consecutive even integers is 11/60. Find the integers....... 1/n + 1/(n+2) = 11/60 what is the question? the question is, "What is the value of the integers? I will be happy to critique your work. We don't do it for

*asked on February 1, 2007* -
## math

7 1/2-1 9/10 what is the difference? PLZ Help!!!!!

*asked on November 2, 2018* -
## Math please help

So I have this question and I don't understand Find the missing number. 32/52 ?/13 A.) 9 B.) 4 C.) 7 D.) 8 so can anyone help me please

*asked on September 14, 2018* -
## physics

We have to do a lab in physics where we research and write on real life applications of momentum, the guidelines we have are Research Assignment: Application of Momentum in Real-Life Situations Task: Choose any real-life situation where the concept of

*asked on March 24, 2015* -
## Chemistry

what is the trend in the atomic radii as the atomic number increases across a period? What is the exception to this trend? I know the radius decreases as you go from left to right, but I can't figure the exception, I read somewhere that it's the noble

*asked on February 23, 2015* -
## History

What are the ethical dimensions of bill 94? (Bill in Quebec that banned face covering in any government funded building such as hospitals, government-subsidized high schools and universities) I mostly need help on the definition of ethical dimensions, I

*asked on June 2, 2014* -
## math

N and P are integers greater than 1 5N is the square of a number 75NP is the cube of a number the smallest value for N+P IS what? i cant figure it out, please help thank you so much

*asked on October 4, 2010* -
## Science

For each reaction in a lab I have to write: 1. the balanced molecular equation including states of matter 2. the balanced complete ionic equation, crossing out spectator ions, including states of matter 3. the balanced net ionic equation, including states

*asked on March 29, 2007* -
## phyics

When Babe Ruth hit a homer over the 10 m -high right-field fence 80 m from home plate, roughly what was the minimum speed of the ball when it left the bat? Assume the ball was hit 1.2 m above the ground and its path initially made a 39 ∘ angle with the

*asked on September 6, 2015* -
## Physics

When switched off, a spinning ceiling fan slows down with an angular acceleration of 1.2 rad/s2. If the fan was spinning at the rate of 10π rad/sec before it was turned off, how many revolutions did it go through before coming to the stop?

*asked on June 30, 2013* -
## Physics

A2.0-kg piece of steel with a temperature of 70 degree C is submerged in 1.0 kg of water at 15 degree C. At what temperature does the water/metal system reach equilibrium? The specific heat of steel is 0.107 cal/(g*K). Specific Heat of water is 4185

*asked on July 1, 2012* -
## COMM215

Can you tell me if everything is correct? Final Grammar Test Part I: True or False 1. The following word group is a FRAGMENT: That movie, one of my favorites. _X_True __False 2. The following word group is a FRAGMENT: The local baseball team, needing a

*asked on February 23, 2012* -
## chemistry

Global warming refers to the rise in average global temperature due to the increased concentration of certain gases, called greenhouse gases, in our atmosphere. Earth's oceans, because of their high heat capacity, can absorb heat and therefore act to slow

*asked on February 5, 2010* -
## Math

A worker tearing down a barn uses a crowbar 4feet long with the shorter end being 2 inches from the fulcrum. If the worker can exert a force of 150lbs at one end of the crowbar, how great a force can be exerted at the other end? (Note the differences in

*asked on July 13, 2009* -
## Chemistry

when potassium in water are combined they produced 4000.0 kJ of heat along with potassium hydroxide and hydrogen gas. how much energy would be produced if you dumped a 1.00 kg chunk of potassium into a swimming pool? s this reaction what is the enthalpy

*asked on October 19, 2015* -
## physics

When Babe Ruth hit a homer over the 10 m -high right-field fence 80 m from home plate, roughly what was the minimum speed of the ball when it left the bat? Assume the ball was hit 1.2 m above the ground and its path initially made a 39 ∘ angle with the

*asked on September 6, 2015* -
## geometry

the following system of equations bounds a region. If the region is rotated about the line x=0, what is the shape of the resulting solid figure? y=-2x+4 X=0 Y=0 Y=2

*asked on March 24, 2015* -
## Math

Kelly was helping a friend with cleaning her bedroom. Kelly spent two hours and cleaned 80% of the room. what fraction of the room did Kelly help clean? How would I solve this - divide?

*asked on January 21, 2015* -
## Calculus

The graph of the equation x2 − xy + y2 = 9 is an ellipse. Find the lines tangent to this curve at the two points where it intersects the x-axis. Show that these lines are parallel.

*asked on October 26, 2014* -
## English

I'm writing an article for my english exam prep, and my main topic that i went off of was the relationship between school, homework and stress on teenagers (the exam prep topic is relationships) in the article I talk about how homework is a large stress in

*asked on June 3, 2014* -
## physics

A car has a flywheel ( a diks of R=0.2m and uniformly distributed mass M=100kg) that can convert 25% of the rotational kinetic energy into translational kinetic energy. The mass of the car is 1000kg ( including flywheel). Suppose the car is at rest, and

*asked on December 30, 2013* -
## PHYSICS URGENT HELP

a charges electric potential energy within an electric field is calculated as the product of the ____ of it's position times the magnitude of it's charge

*asked on December 18, 2013* -
## Chemistry

Determine the sulfate ion concentrate in a solution prepared by diluting 15.00 ml of 0.115 M Y2(so4)3 with 35 ml of water?

*asked on September 12, 2013* -
## calculus

lim_(theta->0)(cos(6 theta)tan(6 theta))/(theta)

*asked on June 2, 2012* -
## math

Sasa had some 20-cent and 50-cent coins. 7/8 of the coins were 20-cent coins and the rest were 50-cent coins.After Sasa had spent $72.50 worth of 50-cent coins and 5/7 of the 20-cent coins, she had 2/7 of the coins left. Find the total amount of money Sasa

*asked on April 19, 2012* -
## algebra

Janelle has $ 20 and is saving $ 6 per week. April has $ 150 and spending $ 4 per week , when will they both have the same amount of money ? i know by trial and error i will get 13 weeks, but how do i solve it by algebra ? please

*asked on January 10, 2012* -
## physics

a car starts from rest and accelerates at in a straight line at a constant rate of 4.5m/s/s. How far will the car travel in 35 seconds.

*asked on November 22, 2011* -
## math

solve with substitution 5x - y=-1 15x=2y

*asked on January 12, 2011* -
## geometry

find the area bounded by a regular pentagon with radius 6 cm. round to the nearest tenth.

*asked on March 2, 2015* -
## math

1. Finding the Counterfeit Coin. You have 5 coins. You know that one of them is counterfeit and weighs less than the others. Suppose also that you have a balance scale. Is there a strategy for finding the counterfeit coin using the balance scale only

*asked on September 30, 2014* -
## History

I still need help with what ethical dimensions are, I understand that it's 'the scope of right and wrong''the extreme of right and wrong' but I don't understand how to apply that to my question, which is what are the ethical dimensions of bill 94? Bill 94

*asked on June 3, 2014* -
## physics

On August 12, 2005 the Mars Reconnaissance Orbiter (MRO) was launched from Earth and reached Mars on March 10, 2006. The orbiter is in roughly circular orbit about 390 km above the martian surface. Mars has a radius of 3396 km and a mass of 0.642 x 1024 kg

*asked on January 4, 2013*