Saturday

December 20, 2014

December 20, 2014

Total # Posts: 1,717

**Chemistry**

If you wanted to prepare 50.0 mL of hydrogen, collected over water at 25 C on a day when the barometric pressure was 730 torr, what mass of aluminum would you react with a hydrochloric acid? (Balance the equation first.) ___Al(s)+___HCl(aq)=___AlCl3(aq)+___H2(g)
*April 8, 2013*

**Chemistry**

A sample of iron reacted with hydrochloric acid. The liberated hydrogen occupied 40.1 mL when collected over water at 27 C at a barometric pressure of 750 torr. What is the mass of the sample of iron? (Because of the collection of gas over water, the vapor pressure of the ...
*April 8, 2013*

**Chemistry**

What volume of hydrogen, measured at 25 C and 1.00 atm can be produced by dissolving 5.0 g of magnesium in hydrochloric acid? (Write and balance the equation for the reaction first.)
*April 8, 2013*

**Chemistry**

Instead of a strip of pure Mg ribbon, you are accidentally given a strip of an aluminum-magnesium alloy. You calculate the mass of the strip as above. Would the mass of the strip be higher or lower than expected? Write the appropriate chemical equations (one equation for the ...
*April 8, 2013*

**Chemistry**

If the strips of MG ribbon are coated with white MgO, would this cause the mass of Mg that you calculate to be too high or too low? Why?
*April 8, 2013*

**Chemistry**

If your partner did not take into account the vapor pressure of water when calculating the moles of hydrogen produced, would the mass of Mg that was calculated at the end of the experiment be too high or too low? Why?
*April 8, 2013*

**la**

shoud students who fail their classes be retained and have to repeat the grade ?
*April 2, 2013*

**la**

shoud students who fail their classes be retained and have to repeat the grade ?
*April 2, 2013*

**chemistry**

Use the molar volume to find the volume, in liters, of 6.40g of O2 at STP.
*April 1, 2013*

**Pre-Algebra**

How many different ways can you choose 3 frozen yogurt toppings from 20? 6,840 1,140 60* 2,260 I think it is 60 because 3*20 however not positive.
*April 1, 2013*

**Finance **

They will need 200,000 in 18 years and they can expect a rate of return of 6 %. How much will they need to invest annually. I would have set it up and gotten $70068.76 but then do you divide by 18?
*March 28, 2013*

**science**

During condensation, what must be changed, temperature or heat energy?
*March 25, 2013*

**chemistry**

N2(g)+H2(g)-NH3(g) Calculate the volume of ammonia gas produced when20cm3 of nitrogen gas was reacted with an excess of hydrogen gas
*March 25, 2013*

**physics**

A bird wants to rech its nest that is located 53 meters (35 degrees south of west) from where it is perched. If the maximum speed that the bird can fly with respect to the air is 12m/s and there is a wind blowing from a direction of east 35 degrees south at a speed of 8.1 ...
*March 24, 2013*

**maths**

(b) A stone is thrown straight up with velocity 14 m s-1 Calculate (i) The time taken for the stone to reach the top of its motion (ii) The time taken for it to reach the ground again (iii) The maximum height it reaches (iv) What is the velocity of the stone at height 8.0 m?
*March 13, 2013*

**maths**

(a) A car accelerates from 0 to 30.0 m s-1 in 6.0 seconds, travels at a constant 30.0 m s-1 for 21.0 seconds, and then brakes to a stop in 3.0 seconds. (i) Draw a velocity-time graph illustrating this motion (ii) Calculate the acceleration (assumed constant) in each section of...
*March 13, 2013*

**maths**

(c) Given that 1 inch = 2.54 cm exactly, express the speed of light, 3.00 „e 108 m/s, in (3 marks each) (i) ft/ns (ii) mile/s
*March 13, 2013*

**maths**

onvert the following to scientific notation: (i) the distance to the sun, 149 500 000 000 m (ii) the wavelength of yellow sodium light, 0.000 000 5893 m (iii) the radius of an atom, 0.000 000 000 2 m
*March 13, 2013*

**maths**

Evaluate (3.00¡Á¡¼10¡½^12 )¡Á(2.40¡Á¡¼10¡½^(-20) ))/(8.00¡Á¡¼10¡½^(-1)
*March 13, 2013*

**Math**

How do you solve negative exponents?
*March 10, 2013*

**Math**

How do you solve negative exponents?
*March 10, 2013*

**chemistry**

A sample of oxygen that occupies 1.00x10^6 mL at 575 mm Hg is subjected to a pressure of 1.36 atm. What will the final volume of the sample be if the temperature is held constant? How would I set up this equation?
*March 4, 2013*

**science**

Q: which of these conditions is least likely to cause a species to become extinct due to environmental changes? A: -less genetic variation -more genetic variation -specific food preferences -more competition for food
*March 3, 2013*

**HELP! LANG ARTS??**

yes it is definately B
*February 27, 2013*

**science**

HeLp Me!!!!!!
*February 23, 2013*

**science**

what are three opposites or non-examples of fossil records?
*February 23, 2013*

**Math **

Math please help
*February 22, 2013*

**Helpppp **

It's college math
*February 22, 2013*

**Helpppp**

Find the apr to the nearest half percent for the following loan Amount financed $3400 Finance charge $470 Number of monthly payments 36 Please help
*February 22, 2013*

**Finance**

Find the finance charge in the open end charge account. Assume interest calculated is on the unpaid balance of the account Unpaid balance $611.80 Monthly interest rate 1.1%
*February 21, 2013*

**Calculus**

Differentiate with respect to theta Y=((sin3theta)(tan3theta))^12
*February 10, 2013*

**please help!**

How do you believe computer mediated communications may affect the future of human communications? PLEASE HELPP !!!!
*January 27, 2013*

**please help!**

How do you believe computer mediated communications may affect the future of human communications? PLEASE HELPP !!!!
*January 27, 2013*

**please help!**

Thank You Very Much !! I kinda of got the idea now . Thanks soo much !
*January 27, 2013*

**please help!**

I checked it out and so far i wrote. but i need 200-400 words !! Please Help In my opinion, I believe it is unlikely for humans to avoid or completely stop attribution errors. One reason why is because humans are naturally made to assume things in which we do not know the ...
*January 27, 2013*

**please help!**

Oh Thanks , I Did not see it.
*January 27, 2013*

**please help!**

How do you believe humans can, best, avoid "attribution" errors?
*January 27, 2013*

**please help!**

How do you believe humans can best,avoid attribution errors ?
*January 27, 2013*

**Speech**

I don't know how to start and also I don't understand the topic I have to write about.
*January 27, 2013*

**Speech**

Post a one hundred word comment on how you believe computer mediated communications may affect the future of interpersonal communications . I DO NOT KNOW HOW TO DO THIS! PLEASE HELP
*January 27, 2013*

**Speech**

copy paste what?
*January 27, 2013*

**Speech**

How do I post a one hundred word paragraph on how I believe computer mediated communications may affect the future of interpersonal communications ?
*January 27, 2013*

**Math**

Sarah can make 6 bracelets per half hour. How many bracelets can she make in 1 hour? Find the factor for the conversion, pints to quarts .
*January 14, 2013*

**Writing**

How can I write a sentence with the word declare, and has to have 10 syllables?
*January 9, 2013*

**Algebra**

how?
*January 9, 2013*

**Algebra**

Write an equation in slope-intercept form of the line that passes through the given point and is parallel to the graph of the given equation. (4,2; x= -3
*January 9, 2013*

**Anyone Please Help!**

thanks
*January 2, 2013*

**Anyone Please Help! **

A plane on a search mission flew east from an airport, turned, and flew west back to the airport. The plane cruised at 300km/h when flying east, and 400km/h when flying west. The plane was in the air for 7 hours. How far from the airport did the plane travel?
*January 2, 2013*

**Math (Ms. Sue Please help!)**

A plane on a search mission flew east from an airport, turned, and flew west back to the airport. The plane cruised at 300km/h when flying east, and 400km/h when flying west. The plane was in the air for 7 hours. How far from the airport did the plane travel?
*January 2, 2013*

**math (algerba 1)**

I still don't understand.
*January 2, 2013*

**math (algerba 1)**

I have a worksheet called puzzle 21 Super Challenge. It's from Crossmatics, Dale Seymour Publications and it's page number is 21. Anyways, I don't understand what it means when it says see 4-across. What does that mean?
*January 2, 2013*

**math (algerba 1)**

A motorboat can travel upstream on a river at 18km/h and downstream at 30km/h. How far upsteam can the boat travel if it leaves at 8am and must return by noon?
*January 2, 2013*

**Math**

A plane on a search mission flew east from an airport, turned, and flew west back to the airport. The plane crised at 300km/h when flying east, and 400km/h when flying west. The plane was in the air for 7 hours. How far from the airport did the plane travel?
*January 2, 2013*

**math**

thanks. I though because you added 70t and 80t there would be 2ts. But no.
*January 2, 2013*

**math**

Never minds. I see my mistake. It's really 6 hours.
*January 2, 2013*

**math**

Two trucks left buck's trucks traveling in opposite directions. One truck traveled at a rate of 70km/h, the other at 80km/h. After how many hours were the trucks 900km apart? I got 3 hours as my answer, but I dont think that's right...
*January 2, 2013*

**math**

neverminds. I got it.
*January 2, 2013*

**math**

Reiny, how can you show me how to do the last part wirten out? Thank you so much!
*January 2, 2013*

**math**

Also, how far had steve traveled when his brother overtook him?
*January 2, 2013*

**math**

thanks
*January 2, 2013*

**math**

Steve McSpoke left home on his bicycle at 8am, traveling at 18km/h. At 10am, Steve's brother set out after him on a motorcycle, following the same route. The motorcycle traveled at 54km/h. How long had steve traveled when his brother overtook him?
*January 2, 2013*

**math**

yes thats it.
*January 2, 2013*

**Science* Please Help Me !**

Thank You Very Much !!!! Rylee your the best
*December 19, 2012*

**Science* Please Help Me !**

How would cell division help heal a broken bone? Why do cuts and disappear when in the process of cell division? What is the main purpose for cell division?
*December 19, 2012*

**univ. physics**

An Otto engine has a maximum efficiency of 33.1 %; find the compression ratio. Assume that the gas is diatomic.
*December 13, 2012*

**univ. physics**

A heat pump has a coefficient of performance of 4.5. If the heat pump absorbs 46.1 cal of heat from the cold outdoors in each cycle, what is the amount of heat expelled to the warm indoors? (in cal)
*December 13, 2012*

**math helpp!!!**

Bernie put in a garden in her back yard. The garden has a perimeter of 265 feet. She wants to know the total surface area of the garden and all she knows is the perimeter and that the width is 20% or (1/5) of the length. (Remember 20% and the fraction 1/5 is the same decimal ...
*December 13, 2012*

**Algebra**

Can you help me set this up? Mr. Smith could ride his 10-speed bike 4.8 miles to his mom's house in 11 minutes. His return trip home took 14 minutes. The times are different due to there being a slight downhill slope on part of the trip to his mom's house. If Mr. Smith...
*December 12, 2012*

**Algebra**

Log5(x+3)(x-2)=log5(14) (X+3)(x-2)=14 X^2+x-6=14 X^2+x-20=0 (X+5)(x-4)=0 X=-5, x=4 -5 is not a true solution because you can't take the log of a negative number X=4
*December 12, 2012*

**Math**

Thank You Very Much !
*December 11, 2012*

**Math**

(3+4)^0 + 3-5^-3 (-4)^-3 * (-2)^3 (23^3)^15
*December 11, 2012*

**physics**

suppose that a seat-belted mother riding in an automobile holds a 10 kg baby in her arms. the automobile crashes and decelerates from 50km/h to 0 in .1 s. what average force would the mother have to exert on the baby to hold it?? do you think she can do this?
*December 11, 2012*

**physics**

suppose that a seat-belted mother riding in an automobile holds a 10 kg baby in her arms. the automobile crashes and decelerates from 50km/h to 0 in .1 s. what average force would the mother have to exert on the baby to hold it?? do you think she can do this?
*December 11, 2012*

**physics**

A rule of thumb for automobile collisions against a rigid barrier is that the collision lasts about .11 seconds, for any initial speed and for any model of automobile. accordingly, the deceleration experienced by an automobile during a collision is directly proportional to the...
*December 11, 2012*

**math **

Sue was in excellent shape in high school, she could ride her 10-speed bicycle 4.8miles to her grandmother's house in 11 minutes. Her return trip home took 14 minutes. The times are different due to there being a slight downhill slop on part of the trip to her grandmothers...
*December 9, 2012*

**Algebra 1**

Thank you!!!
*December 6, 2012*

**Algebra 1**

Can you help me set this up? Suppose you are trying to decide whether to buy ski equipment. Typically it costs $60 day to rent skis and buy a lift ticket. You can buy ski equipment for about $400. A lift ticket alone costs $35 for one day. Find the break-even point. Thanks.
*December 6, 2012*

**Math**

Thank you for your help!
*December 6, 2012*

**Math**

If X = 12 units, Y = 10 units, and Z = 14 units, then what is the surface area of the right triangular pyramid shown above?
*November 27, 2012*

**7th grade Math**

Thom has a scale model of his car. The scale is 1:12. If the actual car has 16-inch wheels, what size are the wheels on the actual scale model?
*November 26, 2012*

**Physics **

part 1 of 3: A hawk flies in a horizontal arc of radius 9.9 m at a constant speed of 4.8 m/s. Find its centripetal acceleration. Answer in units of m/s^2. part 2 of 3: It continues to fly along the same horizontal arc but increases its speed at the rate of 1 m/s^2. Find the ...
*November 19, 2012*

**Physics **

part 1 of 3: A hawk flies in a horizontal arc of radius 9.9 m at a constant speed of 4.8 m/s. Find its centripetal acceleration. Answer in units of m/s^2. part 2 of 3: It continues to fly along the same horizontal arc but increases its speed at the rate of 1 m/s^2. Find the ...
*November 19, 2012*

**Physics**

part 1 of 3: A hawk flies in a horizontal arc of radius 9.9 m at a constant speed of 4.8 m/s. Find its centripetal acceleration. Answer in units of m/s^2. part 2 of 3: It continues to fly along the same horizontal arc but increases its speed at the rate of 1 m/s^2. Find the ...
*November 19, 2012*

**Algebra**

Can you please help me with this? Convert 36.7 lbs/in(3) to kilograms per cm(3). (There are 14.59 kilograms in 32.174 pounds and 61.02 in(3) in 1000 cm(3)). Thank you!
*November 18, 2012*

**7th grade science**

mrs.sue....
*November 18, 2012*

**7th grade science**

help somebody
*November 18, 2012*

**7th grade science**

Hello....
*November 18, 2012*

**7th grade science**

Can someone please help me out with this question by explaining why that answer choice is the answer to this question. Thank you for your time and help.
*November 18, 2012*

**7th grade science **

Q: An igneous intrusion cuts through three layers of sedimentary rock. which rock is the youngest? and why? A: A) the igneous intrusion B) the top layer of sedimentary rock C) the middle layer of sedimentary rock D) the bottom layer of sedimentary rock
*November 18, 2012*

**math**

The answer is, each fruit snack costs 20 cents.
*November 14, 2012*

**biomechanics**

did u manage to work this out?
*November 14, 2012*

**Chemistry**

mass percent by difference would be 100- (11.37+12.24+28.01)
*November 13, 2012*

**statistics**

A bag contains a total of 24 white, red, and blue marbles. A student randomly selects a marble from the bag, records the color, and then returns the marble to the bag. The student repeats the process 24 times. The bar graph shows the results of the student's experiment ...
*November 12, 2012*

**english**

Hello! say i got 54 out of 75 points on a test... what would my grade be (A,B,C,D,or a F). thanks!
*November 11, 2012*

**algebra**

Ben Cole was hired to shovel 100 tons of coal. He has been shoveling coal at a rate of 16 tons per day. After 3 days his brother Char joins him so they can finish the job faster. Char can shovel 10 tons per day. Find the amount of the 100 tons shoveled by each brother and the ...
*October 24, 2012*

**algebra**

The stock of Company A is valued at $18.20 per share. The company's earnings for one year amounted to $2.80 per share. If Company earned $3,360,000 in that year, what was the total value of its stock?
*October 24, 2012*

**math**

what is the trem for 3,500*1,500 the value
*October 14, 2012*

**math- surface and volume**

If volume increases by 60%, how much does the surface increase by? Please show work.
*October 13, 2012*

**math**

12 inches tall
*October 9, 2012*

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