# michelle

Most popular questions and responses by michelle-
## chemistry

What are the spectator ions in the following complete ionic equation: Ba2+(aq)+2I−(aq)+2Na+(aq)+SO2−4(aq)→BaSO4(s)+2I−(aq)+2Na+(aq). Thank you so much!!!

*asked on July 8, 2013* -
## chemistry

Write the formula of the conjugate base for acid H3PO4 and what is the name of the base Write the formula of the conjugate base for acid H3O+ and what is the name of the base ..........and how can i tell how to get it? i am lost

*asked on June 10, 2010* -
## College Physics

Can someone check my answers for two and help me with the third? 1) A mass m at the end of a spring of spring constant k is undergoing simple harmonic oscillations with amplitude A. Part (a) At what positive value of displacement x in terms of A is the

*asked on April 25, 2014* -
## AP chem

A 0.345g sample of anhydrous BeC2O4, which contains an inert impurity, was dissolved in a sufficient water to produce 100ml of solution. A 20.0ml portion of the solution was titrated w/ KMnO4(aq). The balanced equation for the reaction that occurred is as

*asked on January 4, 2007* -
## Precalculus

Please help...a computerized spin balance machine rotates a 25 inch diameter tire at 480 revolutions per minute. (a) find the road speed in miles per hour at which the tire is being balanced (b) at what rate should the spin balance machine be set so that

*asked on September 13, 2012* -
## chem

I am pretty confused on this. 1. Pick the appropriate solvent to dissolve A) Sodium Chloride (ionic) B) Sodium Nitrate (ionic) both have the choices of 1) water 2) acetone 3)ethanol 4)methanol 5)carbon tetrachloride 6)toluene 7)hexane

*asked on September 18, 2012* -
## Physics

Two cars collide at an icy intersection and stick together afterward. The first car has a mass of 1500 kg and was approaching at 9.00 m/s due south. The second car has a mass of 700 kg and was approaching at 15.0 m/s due west. (a) Calculate the final

*asked on June 26, 2014* -
## Calculus

Squares with sides of length x are cut out of each corner of a rectangular piece of cardboard measuring 3 ft by 4 ft. The resulting piece of cardboard is then folded into a box without a lid. Find the volume of the largest box that can be formed in this

*asked on November 5, 2015* -
## science - physics

A plane flies with a velocity of 52 m/s east through a12 m/s cross wind blowing the plane south. Find the magnitude and direction (relative to due east) of the resultant velocity at which it travels.

*asked on September 27, 2011* -
## math

how can you find what each mark represents on a number line?

*asked on September 13, 2015* -
## Language Arts

Please help! In an essay discuss the way in which Naomi Shihab Nye treats loneliness in "The Rider" What does loneliness mean to the speaker? How does bicycling help her leave her loneliness behind? Cite passages from the poem to support your points. My

*asked on April 27, 2017* -
## physics

A car travels due east with a speed of 35.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle of 40.0° with the vertical. Find the velocity of the rain

*asked on January 24, 2010* -
## statistics

A history class has 75 members. If there is a 12% absentee rate per class meeting, find the mean, variance, and atandard deviation of the number of students who will be absent from each class

*asked on May 16, 2011* -
## Chemistry

Three solutions are mixed together to form a single solution. One contains 0.2 mol Pb(CH3COO)2, the second contains 0.1 mol Na2S, and the third contains 0.1 mol CaCl2. Write the net ionic equations for the precipitation reaction or reactions that occur.

*asked on April 29, 2011* -
## Stats

About 10% of the population of a large country is math phobic. If two people are randomly selected what is the probability both are math phobic? And hat is the probability that at least one is math phobic? Any way to do this on stat crunch?

*asked on October 11, 2015* -
## Chemistry

Radium-223 has a half-life of 11.4 days.Approximately how long would it take for the activity of a sample of Radium-223 to decrease to 1.00% of its initial value?

*asked on March 1, 2013* -
## chemistry

A magic number is the name given to certain numbers of protons or neutrons that have a high correlation to stability in nuclei. Magic # of protons: 2,8,20,28,50,82 Magic # of neutrons: 2,8,20,38,50,82,126, 184 Using general trends, predict the stability of

*asked on December 4, 2012* -
## physics help please!

The motion of a piston in an auto engine is simple harmonic. The piston travels back and forth over a distance of 23 cm, and the piston has a mass of 1.7 kg. 2515 rpm 23 cm max speed of the piston 30.28757 m/s What is the maximum force acting on the piston

*asked on December 6, 2012* -
## Technical writing

Identify the sentence that is punctuated correctly. Select one: a. My parents moved to West Virginia when they retired because the price of living is cheaper there. b. My parents moved to West Virginia, when they retired, because the price of living is

*asked on March 7, 2017* -
## Townview

Elaine is painting a fence. She knows that she needs 1 gallon of paint for each 10 feet of fencing. The fencing will enclose a rectangular yard that is 3 yards long and 2 yards wide. How much paint does Elaine need? (Remember 3 feet = 1 yard)

*asked on May 14, 2015* -
## Chemistry

There are several technological applications for the transuranium elements (Z > 92). An important one is in smoke detectors, which can use the decay of a tiny amount of americium-241 to neptunium-237.What subatomic particle is emitted from that decay

*asked on March 1, 2013* -
## science

a)Calculate the mass percent of carbon in the hydrated form of the solid that has the formula BeC2O4 loosly bonded to 3H2O. b)When heated to 220degrees C, BeC2O4loosly bonded to 3H2O(s) dehydrates completely as represented below: BeC2O4loosely bonded to

*asked on January 4, 2007* -
## chemistry

Consider the following overall reaction which is experimentally observed to be second order in AB and zero order in C: AB+C -> A+BC Determine whether the mechanism below is valid for this reaction AB+ AB -> AB(sub 2) + A slow AB(sub2) + C -> AB+BC fast

*asked on October 10, 2012* -
## Physics

A thundercloud has an electric charge of 43.2 C near the top of the cloud and -38.7 C near the bottom of the cloud. The magnitude of the electric force between these two charges is 3.95 x 106 N. What is the average separation between these charges? (kc =

*asked on February 20, 2013* -
## physics

As a result of friction, the angular speed of a wheel changes with time according to d(theta)/dt = w0 e^-(aplpha*t) where w0 and alpha are constants. The angular speed changes from an initial angular speed of 4.87 rad/s to 4.27 rad/s in 33.93s. A)

*asked on October 26, 2012* -
## chemistry

a 500ml sample of o2 gas at 24 degrees celsius was prepared by decomposing a 3% aqueous solution of hydrogen peroxide, in this presence of a small amount of manganese catalyst by the reaction 2H2O2>2H2O+O2. The oxygen thus prepared was collected by

*asked on April 16, 2012* -
## English. Punctuation and Mechanics

Identify the sentence with the correct punctuation. a) Do you have everything - such as extra clothes; for your trip? b) Do you have everything: such as extra clothes, for your trip? c) Do you have everything - such as extra clothes, for your trip? d) Do

*asked on January 23, 2012* -
## Chemisty

The activity of a radioisotope is 3000 counts per minute at one time and 2736 counts per minute 48 hours later. What is the half-life of the radioisotope?? a) 831hr b)521hr c)361 hr d)1.44hr

*asked on May 14, 2015* -
## organic chemistry!

Just wanted to know if I have named the following compounds correctly..and wanted to know if there are any short-hand or easier methods of naming organic compounds because they are a bit confusing!I tried drawing structural formulas for the following as

*asked on December 27, 2006* -
## Language Arts

What is the main theme of the story the bachelor tells in "The Story-Teller"? Good children win many medals Parks are beautiful places Too much goodness can be bad *** Good people do something bad eventually

*asked on November 18, 2015* -
## Technical writing

Identify the sentence that is punctuated correctly. Select one: a. In December 2013 I visited my aunt for Christmas in Allentown, Pennsylvania, for the first time in 20 years. b. In December 2013, I visited my aunt for Christmas in Allentown, Pennsylvania

*asked on March 7, 2017* -
## Algebra

Suppose a cost-benefit model is given by y=2771x/100-x, where y is the cost for removing x percent of a given pollutant. What percent of pollutant can be removed for $36,000? Round your answer to the nearest tenth of a percent?

*asked on June 9, 2014* -
## math

Write an expression from the model below and then simplify the expression. Positive Negative Which equation is modeled on the number line below? (-56)/(-8) = 3- (-4)= 7.1 (Rational Numbers) No Calculators Fill in the chart below. Base of 10 Whole Number or

*asked on February 2, 2012* -
## Math

A phone tree is used to let committee members know that a meeting is cancelled. The committee chair calls 5 people . Those 5 people each call 5 people and those additional people each call 5 people. How many members have been called?

*asked on March 6, 2015* -
## Chemistry

am I doing this equation correctly, please help. K3PO4(aq) + Ba(NO3)2(aq) my answer: 3K(NO3)2(aq) + 2Ba(PO4)3(s) Double displacement precipitation

*asked on April 4, 2015* -
## Math

Ralph's age is currently 3 years more than twice joe's age. But 3 years ago, ralph was was 4 times as old as Joe was the . How old will joe be in 10 years?

*asked on July 10, 2015* -
## Algebra

A campground consist of 10 square campsites arranged in a line along the beach the distance from the edge of the campsite to the water is 4 yards the area of the campground including the beach Is 1050 yd.² what's the width of one campsite

*asked on April 19, 2016* -
## Chemistry

The bubble in the tip of the buret is not removed prior to performing the NaOH standardization. Will the reported concentration of the NaOH be greater than, less than, or equal to the true concentration of the NaOH if the bubble is flushed from the buret

*asked on April 4, 2015* -
## chem

Potassium nitrate has a lattice energy of -163.8 kcal/ mol and a heat of hydration of -155.5 kcal/ mol . How much potassium nitrate has to dissolve in water to absorb 105kj of heat? Answer in kg.

*asked on September 19, 2012* -
## statistics

If 8% of the population of trees are elm trees, find the probability that in a sample in a sample of 100 trees, there are exactly 6 elm trees. assume the distribution is approximately Poisson

*asked on May 16, 2011* -
## statistics

Data has been collected from a representative of a well-defined population to answer the question: "How much money does the average senior male at Normal Community High School have in his pockets at the end of the school day on Friday?" The next step in

*asked on March 28, 2016* -
## Math

A DVD case is 9/16 in. Thick. How many of these cases will fit on a shelf that is 1 1/2 ft wide

*asked on March 8, 2013* -
## physics

A loaded truck can accelerate at 3.2 m/s^2 It loses its load so that it is only 0.2 as massive. By what factor must the acceleration change for the same driving force?

*asked on September 28, 2012* -
## Technical writing

In order to have a complete sentence, you need a ________. Select one: a. subject, verb, and a complete thought b. subject and verb c. subject, verb, and a prepositional phrase d. subject, verb, and a dependent clause

*asked on February 16, 2017* -
## statistics

Entry to a certain University is determined by a national test. The scores on this test are normally distributed with a mean of 500 and a standard deviation of 100. Tom wants to be admitted to this university and he knows that he must score better than 70%

*asked on November 20, 2012* -
## chem

a solution is prepared with 3.26g kcl and water to make 25.0ml,of kcl,what is the %(m/V) of the kcl solution.

*asked on April 22, 2015* -
## Physics

I already figured out the answers to some but I need help with two more. 1) A disk with an initial angular velocity ω0 = 4.5 rad/s experiences a constant angular acceleration of α = 7.5 rad/s2 for time t = 15 s. Please answer the following questions. ω0

*asked on April 2, 2014* -
## College Math

Michael is a software salesman. Let y represent his total pay (in dollars). Let x represent the number of copies of History is Fun he sells. Suppose that x and y are related by the equation 1700+90x=y .

*asked on March 28, 2017* -
## College Chemistry

A sample of an iron alloy contains 92.1g Fe, 2.59g C, and 1.59g Cr. Calculate the percent by mass of each component present in the alloy sample.

*asked on April 16, 2012* -
## physics

A 156-kg coil of sheet steel is 0.80 mm thick and 50 cm wide. How long is the steel in the coil?

*asked on May 26, 2013* -
## Pre Albergra

The Pentagons ABCDE and PQRST are Similar: Find the length x of TP

*asked on November 16, 2014* -
## chemistry

Aluminum sulfate reacts with sulfuric acid to produce aluminum sulfate and hydrogen gas. How many grams of aluminum sulfate would be formed if 250g H2 SO4 completely react with aluminum?

*asked on December 9, 2007* -
## pre algebra

Ryan is thinking of a number. When he multiplies this number by 6 and then subtracts 15 from the answer, he ends up with his original number. What number is Ryan thinking of?

*asked on January 10, 2014* -
## physics

Mayan kings and many school sports teams are named for the puma, cougar, or mountain lion Felis concolor, the best jumper among animals. It can jump to a height of 13 ft when leaving the ground at an angle of 40.4°. With what speed, in SI units, does it

*asked on January 24, 2010* -
## statistics

Scores from a statistics exam are reported as deviation scores. Which of the following deviation scores indicates a higher position in the class distribution?

*asked on December 6, 2012* -
## social studies

which of the following statements is supported by the information in the map please help

*asked on November 14, 2012* -
## Chem 130

Carbon monoxide burns in oxygen to form carbon dioxide. what volume of oxygen at 25 degrees Celsius and 760. mmHg is required to react with 15.0 L of carbon monoxide which id at STP?

*asked on December 1, 2014* -
## trigonometry

A race car is driven around a circular tract at a constant speed of 180 miles per hour. If the diameter of the track is 1/2 miles, what is the angular speed of the car? Express your answer in revolutions per hour. I know the answer is 114.59 revolutions

*asked on May 1, 2007* -
## physics

The mean distance of the planet Neptune from the Sun is 30.05 times the mean distance of Earth from the Sun. a.) Determine how many Earth-years it takes Neptune to orbit the Sun. b.) The mass of the Sun is 1.99 x 10^30 kg, and the closest distance of

*asked on December 16, 2008* -
## Determining whether expired air contains carbon dioxide

1.Formulate a hypothesis for this investigation 2.State the aim of this investigation 3. a)Independent variable b)Dependent variable c)Controlled variable 4.State methods and the control

*asked on August 23, 2015* -
## Technical writing

Which is the correct comparative form of easy? Select one: a. easiest b. more easy c. easier d. easyer C

*asked on March 3, 2017* -
## math

write a problem about going to the laundromat that has a hidden question. a single load of laundry costs $2 and a double load costs $4.explain how you solved your problem.

*asked on December 16, 2015* -
## math

how many integers are their own multiplicative inverses? a. 0 b. 1 c. 2 d. 3 is it 2 or 3? because it could be 1, -1, and 0

*asked on July 23, 2018* -
## electrical trade theory

GIVE 2 REASONS WHY MICA IS USED AS THE INSULATION BETWEEN THE SEGMENTS OF THE COMMUTATOR? it is cheap, easy to use, heat resistant, an effective insulator, vibration resistant...what is your thinking on this? THANX TEXT BOOK DON'T HAVE THAT ANSWER.

*asked on September 30, 2006* -
## college chemistry

Followed by the total volume. Calculate the molarity of this solution: 0.521 mol NaCl;125 mL

*asked on April 16, 2012* -
## physical science

The heating elements of an electric toaster is typically made of nichrome wire (an alloy of nickel and chromium). As current passes through the wires, the wires heat up, thus toasting the toast. Estimate the overall resistance of a heating element which is

*asked on February 17, 2017* -
## physics

You and a friend each drive 50.0 km. You travel at 90 km/h; your friend travels at 95.0 km/h. How long will your friend wait for you at the end of the trip?

*asked on August 30, 2009* -
## Math

You have a painting that is 30 in. wide and 22.5 in. tall. You would like to reproduce it on a sheet of paper that measures 8 1/2 in. by 11 in., leaving at least a 1in. margin on all four sides. a) What scale should you use if you keep the sheet of paper

*asked on November 16, 2018* -
## physics help!

A uniform stationary ladder of length= 5.1 m and mass= 15 kg leans against a smooth vertical wall, while its bottom legs rest on a rough horizontal floor. The coefficient of static friction between floor and ladder is μ = 0.41. The ladder makes an angle

*asked on April 10, 2014* -
## pre algebra

Laura takes very good care of her vehicles. She owns a blue van and a red truck. Although she bought them both new, she has owned the truck for 17 years longer than she has owned the van. If the sum of the ages of the vehicles is 41 years, how old is the

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

Write an equation that represents how dihydrogen phosphate ion (H2PO4-) behaves as an Arrhenius acid. ( Be sure to include the correct charges for ions.)

*asked on April 21, 2013* -
## science

what is the concentration of hydrogen ion in a 0.1M solution of sodium hydroxide(NaOH)? NaOH dissolves and completely dissociates in H2O to form the ions. NaOH ==> Na^+ + OH^- Therefore, starting with 0.1 M NaOH will give you 0.1 M in Na^+ and 0.1 M in

*asked on December 31, 2006* -
## Physics

Question 2. 3 Consider a box that explodes into two pieces while moving with Fig. 9-24 a constant positive velocity along an x axis. If one piece, with mass : m1, ends up with positive velocity v1, then the second piece, with : mass m2, could end up with

*asked on April 1, 2013* -
## chemistry

The combustion of propane (C3H8)produces CO2 and H20: C3H8(g)+5O2(g) 3CO2(g)+4H2O(g) Calculate the mass, in grams, of H2O that will be produced if 2.5 mol of O2 is consumed.

*asked on March 16, 2011* -
## Math

The scale drawing of a soccer field mis 1 inch= 10 yards. The drawing of a soccer field is 12 inches by 7.5 inches. Find the dimensions of the actual soccer field in square feet.

*asked on August 13, 2016* -
## Health

When you wake up and a large pimple greets you when you look into the mirror, this endocrine gland is to blame Thymus Gland Reproductive Gland Thyroid Gland Pancreas

*asked on November 13, 2015* -
## Chemistry

When the solid and liquid phases are in equilibrium, which phase, solid or liquid, contains the most amount of energy (kenetic energy is the same)? Also, what is the difference between the melting and freezing of a substance?

*asked on February 16, 2009* -
## Chemistry

If the solubility of Ag2CO3 is 1.3x10^-4 mol/L, what is its Ksp? (the answer is said to be 8.8x10^-12) Ag2CO3(s) -----> 2 Ag+ (ag) + CO3 2- Ksp= [Ag+]^2 [CO3^2-] = [1.3x10^-4]^2[1.3x10^-4] =2.197x10^-12 thats what I did, but I found that if you first

*asked on July 18, 2018* -
## fundamentals of math

there are 40 bikes inspected. If 15 need new tires and 26 need gear repairs. -what is the greatest number of bikes that could have needed both repairs? -The least number that could have needed both? -Greatest number that could have needed neither repair?

*asked on September 5, 2015* -
## statistics

the average amount of rain per year in Greenville is 49 inches. the standard deviation is 8 inches. find the probability that nest year greeville will receive the following amount of rainfall. assume the variable is normally distributed. a) At most 55

*asked on May 16, 2011* -
## physics

a golf ball is hit at an angle of 45 degrees with the horizontal. if the initial velocity of the ball is 52m/s , how far will it travel horizontally before striking the ground?

*asked on October 30, 2017* -
## physics

An astronaut on a strange planet finds that she can jump a maximum horizontal distance of 15.0 m if her initial speed is 2.40 m/s. What is the free-fall acceleration on the planet?

*asked on January 24, 2010* -
## science

what is the kinetic energy, in J, of a)an Ar atom moving w/ a speed of 650m/s b)a mole of Ar atoms moving w/ a speed of 650m/s? a) K.E. = (1/2) M V^2 For M, use the mass of an Argon atom. It equals 0.040 kg (40 g) divided by Avogadro's number. M must be in

*asked on January 8, 2007* -
## physics

A boxcar of mass 200 tons at rest becomes uncoupled on a 2.5 degree grade. If the track is considered to be frictionless, what speed does the boxcar have after 10 seconds?

*asked on October 20, 2008* -
## finance

Tangshan Mining is considering issuing long-term debt. The debt would have a 30 year maturity and a 12 percent coupon rate and make semiannual coupon payments. In order to sell the issue, the bonds must be underpriced at a discount of 2.5 percent of face

*asked on July 15, 2013* -
## Gr. 12 Data Management

Five different CD-Rom games: garble, trapster,zoom, bungie, and blast'em are offered as a promotion by SugrRush cereals. One game is randomly included ith each box of cereal. Determine the probability of getting all 5 games if 12 boxes are purcahsed.

*asked on February 16, 2008* -
## Economics

3. Suppose a firm has a constant marginal cost of $10. The current price of the product is $25, and at that price, it is estimated that the price elasticity of demand is -3.0. a. Is the charging the optimal price for the product? Demonstrate how you know.

*asked on September 3, 2012* -
## Calculus

Find the point on the graph of y=2x-4 that is closest to the point (1,3). (Optimization equation)

*asked on December 6, 2010* -
## Physics

A circular hole in an aluminum plate is 2.725 cm in diameter at 0.000 degrees celsius. What is its diameter when the temperature of the plate is raised to 100.0 degrees celsius?

*asked on October 6, 2012* -
## physics

Two children hang by their hands from the same tree branch. The branch is straight, and grows out from the tree trunk at an angle of 27.1° above the horizontal. One child, with a mass of 42.4 kg, is hanging 1.22 m along the branch from the tree trunk. The

*asked on November 23, 2010* -
## English (Macbeth)

Act 3 What information is the audience given about the following characters: Malcolm Macduff Edward the Confessor Siward i really need help i think the answer for macduff is that he is trying to convince malcolm to help him overthrow Macbeth

*asked on October 13, 2014* -
## statistics

the weights of newborn babies are distributed normally, with the mean of approximately 115 oz and a standard deviation of 20 oz. if a newborn baby is selected at random. what is the probability that the baby weighs more than 95 oz?

*asked on September 18, 2014* -
## physics

A man named Harold is standing in a train car that has no windows. Since there aren't any windows, he doesn't know how fast or in what direction the train is moving or whether it is accelerating or decelerating. Harold decides that he might be able to

*asked on February 11, 2015* -
## Math

A book of golf balls contains yellow golf balls and white golf balls. You collect the representative sample shown (3 yellow, 2 white). If the bucket contains 50 golf balls about how many golf balls are white ?

*asked on November 29, 2016* -
## Chemistry

Write an equation showing that calcium hydroxide acts as an Arrhenius base in water. **(I'm not sure where to start or how to go about this question)

*asked on April 21, 2013* -
## college chemistry

When solutions of AgNO3 and NaOH react, the balanced molecular equation is 2AgNO3(aq) + 2NaOH(aq) Ag2O(s) + 2NaNO3(aq) + H2O(l) How much Ag2O is produced when 0.200 g of AgNO3 and 0.200 g of NaOH react?

*asked on August 7, 2010* -
## statistics

the average number of gallons of lemonade consumed by the football team during a game is 20, with a standard deviation of 3 gallons. assume the variable is normally distributed. when a game is played, find the probability of using a) Between 20 and 25

*asked on May 16, 2011* -
## Chemistry

A 19.9mL volume of a hydrochloric acid solution reacts completely with a solid sample of magnesium carbonate, producing 183mL of CO2 that is collected over water at 24.0 degrees C and 738 torr total pressure. The vapor pressure for water at 24.0 degrees C

*asked on April 18, 2013* -
## Physics

Thanks for taking a look! A baseball of mass m1 = 0.46 kg is thrown at a concrete block m2 = 8.25 kg. The block has a coefficient of static friction of μs = 0.81 between it and the floor. The ball is in contact with the block for t = 0.165 s while it

*asked on March 25, 2014* -
## Speed'Distance'Time

Find out the distance covered when, speed is 960 km/hour and time is 1 hour 50 minutes.

*asked on March 19, 2013*