Sunday

August 30, 2015
Total # Posts: 72

**Chemistry**

Determine the mass of PbSO4 produced when 10mL of 0.2M CuSO4 reacts with 10mL of 0.2M Pb(NO3)2? Balance the equation CuSO4 + Pb(NO3)2 → PbSO4 + Cu(NO3)2 Find the number of moles for CuSO4 c=n/v n=c × v n=0.2 × 0.01 n=0.002 mol Since it is a 1:1 ratio, the ...
*August 5, 2015*

**Chemistry**

What are some errors that can be made in colorimetry?
*July 26, 2015*

**chemistry**

is gravimetric analysis or colourimetry more accurate when it comes to precipitation reactions where only around 6g and 100ml of the products are used?
*July 23, 2015*

**chemistry**

Ammonia is often produced by reacting nitrogen gas with hydrogen gas. How many liters of ammonia gas can be formed from 12.9 L of hydrogen gas at 93.0°C and a pressure of 43.5 kPa? (Assume an excess amount of nitrogen gas.) I have absolutely no idea how to begin this.
*March 17, 2015*

**science**

sound travels in theses from its source
*January 15, 2015*

**mixture problems**

A chemist has two solutions of sulfuric acid. One is a 25% solution, and the other is a 50% solution. How many liters of each does the chemist mix to get 10 liters of a 40% solution? 25% solution L: 50% solution L:
*November 21, 2014*

**mixture problems**

How many gallons of 45% butterfat cream must be mixed with 500 gallons of 3% butterfat milk to obtain a 5% butterfat milk?
*November 21, 2014*

**math **

A manufacturer of lapel buttons test marketed a new item at a university. It was found that 1,000 items could be sold if they were priced at $4, but only 600 items could be sold if the price were raised to $8. On the other hand, the manufacturer finds that 400 items can be ...
*November 21, 2014*

**Physics**

Bats are extremely adept at catching insects in midair. If a 62-g bat flying in one direction at 9 m/s catches a 6-g insect flying in the opposite direction at 4 m/s, what is the speed of the bat immediately after catching the insect?
*October 31, 2014*

**Physics**

A skateboarder of mass 38.0 kg is riding her 3.90-kg skateboard at a speed of 5.40 m/s. She jumps backward off her skateboard, sending the skateboard forward at a speed of 8.5 m/s. At what speed is the skateboarder moving when her feet hit the ground?
*October 31, 2014*

**Algebra**

Fiona invested $1000 at 8% compounded continuously. At the same time Maria invested $1100 at 8% compounded daily. How long will it take for their investments to be equal in value? Assume there are 365 days in every year. Please help I have tried everything and cannot solve ...
*June 27, 2014*

**Math**

the first person to get the right wins 10000000000000 dollars
*January 22, 2014*

**science **

On average, froghopper insects have a mass of 12.3 mg and jump to a height of 428 mm. The takeoff velocity is achieved as the little critter flexes its leg over a distance of approximately 2.0 mm. Assume a vertical jump with constant acceleration. How long does the jump last (...
*October 25, 2013*

**science **

On average, froghopper insects have a mass of 12.3 mg and jump to a height of 428 mm. The takeoff velocity is achieved as the little critter flexes its leg over a distance of approximately 2.0 mm. Assume a vertical jump with constant acceleration. How long does the jump last (...
*October 25, 2013*

**Math**

16. Alison uses a total of 94.5 cups of dog food each week to feed her three dogs. Each dog eats the same amount. How much does each dog eat in one day? 19. | x - 2 | = 2 Choose from -4, -3, -2, -1, 0, 1, 2, 3, 4. Find all of the numbers that are solutions of the equation.
*October 10, 2013*

**Algebra**

When writing an equation in slope-intercept form, does be have to be a positive number or can it be negative? For example, y=-3x-5.
*August 31, 2013*

**Algebra**

Sorry, it says 8^log(8^5)
*April 7, 2013*

**Algebra**

Use properties of logarithms to find the exact value of each expression. Do not use a calculator. 8^log 8^5
*April 7, 2013*

**Algebra**

How do you find the domain and range?
*April 7, 2013*

**math**

What do you get when you double 1/8?
*January 28, 2013*

**math**

Erica had 7/8 of a pizza left. Her friend ate 1/6 f the pizza that was left. What fraction of the whole pizza did her friend eat? PLEASE HELP!
*January 22, 2013*

**Pre-Cal Trig**

Two lookout towers are situated on mountain tops A and B, 4 mi from each other. A helicopter firefighting team is located in a valley at point C, 3 mi from A and 2 mi from B. Using the line between A and B as a reference, a lookout spots a fire at an angle of α = 37° ...
*November 28, 2012*

**Pre-Cal**

Angles of elevation to an airplane are measured from the top and the base of a building that is 40 m tall. The angle from the top of the building is 37°, and the angle from the base of the building is 40°. Find the altitude of the airplane. (Round your answer to two ...
*November 28, 2012*

**Physics**

A 21.3-g bullet is fired from a rifle. It takes 3.77 × 10-3 s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 779 m/s. Assuming that the acceleration of the bullet is constant, find the average net force exerted on the bullet.
*October 11, 2012*

**physics**

Over a time interval of 1.72 years, the velocity of a planet orbiting a distant star reverses direction, changing from +18.2 km/s to -18.8 km/s. Find (a) the total change in the planet's velocity (in m/s) and (b) its average acceleration (in m/s2) during this interval. ...
*September 11, 2012*

**physics**

A motorcycle has a constant acceleration of 4.33 m/s2. Both the velocity and acceleration of the motorcycle point in the same direction. How much time is required for the motorcycle to change its speed from (a) 40.0 to 50.0 m/s, and (b) 70.0 to 80.0 m/s?
*September 11, 2012*

**physics**

Two motorcycles are traveling due east with different velocities. However, 5.81 seconds later, they have the same velocity. During this 5.81 -second interval, motorcycle A has an average acceleration of 4.07 m/s2 due east, while motorcycle B has an average acceleration of 16.1...
*September 11, 2012*

**physic**

The initial velocity and acceleration of four moving objects at a given instant in time are given in the following table. Determine the final speed of each of the objects, assuming that the time elapsed since t = 0 s is 2.2 s.
*September 11, 2012*

**physics**

A sprinter explodes out of the starting block with an acceleration of + 2.29 m/s2, which she sustains for 1.13 s. Then, her acceleration drops to zero for the rest of the race.
*September 11, 2012*

**algebra**

A line of chorus girls
*May 5, 2012*

**geometry**

have 35sqft to cover using 8"tiles how many needed to do the job?
*March 12, 2012*

**essay**

Pretty Little Liars :D<3
*March 9, 2012*

**finance**

Templeton Extended Care Facilities, INC. is considering the acquisition of a chain of cemeteries for $370 million. Since the primary asset of this business is real estate, Templeton’s management has determined that they will be able to borrow the majority of the money ...
*March 5, 2012*

**Math**

This is the error message I see, how do I fix this: listarray:argument must be an array;found:b--anerror.2 debug this try: debugmode(true)
*February 8, 2012*

**chemistry**

Aluminum reacts with hydrochloric acid to produce aluminum chloride and hydrogen gas. What mass of hydrochloric acid reacts when 87.7 grams of aluminum dissolves? The equation is 2Al+6HCl=2AlCl3+3H2
*January 31, 2012*

**Physics**

A deorbit burn has been performed. During this deorbit burn a pre-calculated Delta V (change in velocity) of 290 ft/s (or 88.4 m/s) will be used to decrease the Shuttle’s altitude from 205 miles to 60 miles at perigee. The Shuttle’s Orbital Maneuvering System (OMS) ...
*January 3, 2012*

**Algebra POW HELP!!!!!**

what is the answer to pow4
*October 6, 2011*

**CHEMISTRY**

how many meter are in 500 cm? can you please show the work
*September 20, 2011*

**Chemistry**

The heads of matches are made with P4S3. this material is made by heating a mixture of red phosphorus and sulfur: 8P4 + 3S8----> 8P4S3 If a match company uses 5435 grams of phosphorous (p4) with an excess of sulfure, how many grams of P4S3 can be made? Can someone step by ...
*July 11, 2011*

**Chemistry**

Please help. Calculate the pH at the following points during the titration of 100.0 mL of 0.20 M acetic acid (Ka for acetic acid = 1.8 x 10-5) with 0.10M sodium hydroxide 1. before addition of any base 2. after addition of 30.0mL of base 3. after addition of 100.0mL of base 4...
*April 26, 2011*

**Chemistry**

Thank you so much! I would really appreciate it! [OH-]= 4.2x10^-4 M pH=10.6 or 11 Are these answers correct?
*April 18, 2011*

**Chemistry**

Calculate [OH-] and pH for the following strong base solution: 10.0 mL of 0.0105 M Ca(OH)2 diluted to 500.0 mL
*April 18, 2011*

**physics**

There is a box attached to a spring. The spring has a spring constant of 39 N/m. The ì between the box and the surface is 0.3. The box has a mass of 1 kg. What is the maximum distance that the spring can be stretched from equilibrium before the box begins to slide back?
*February 1, 2011*

**8th grade math**

hi my name is kendall in 9 in 4th grade i want to skip grades im a nerd im very smart and I talk alot but I stop talkng in school so I hope you help me skip grades to 7th grade thank you.
*November 20, 2010*

**math**

-18 > x/6-10 let "x" be the unknown number solve the inequality.
*February 4, 2010*

**Spanish**

The irregular stem of Poder in the preterite is "pud" then add your ending
*January 14, 2010*

**Math**

Thank you! I multiplied the wrong reciprocal, flipping 3/4 to 4/3!
*January 14, 2010*

**Math**

I am having a hard time with this word problem: A road crew has 3/4 ton of stone to divide evenly among 4 sidewalks. How much stone does the crew need for each sidewalk. a. 3/8t b. 3/16t c. 5/16t d. 5/24t This is what I did: 4 divided by 3/4 is 4/1 x 4/3 is 12/3...not one of ...
*January 14, 2010*

**7th grade science**

What kind of inheritance governs foot length?
*January 4, 2010*

**7th grade science**

Write a pedigree in which there are parents and 4 children, 1 girl and 1 boy are color blind and the other girl and boy are not. I HAVE A FEW QUESTIONS- ?- For a girl to be colorblind does her mother have to be colorblind too or just a carrier?her father? ?- If two people are ...
*January 4, 2010*

**THANK YOU**

THANK YOU SO MUCH BOBPURSLY.you are a great help to me, i kind of already knew that but it reassured me that i was doing the right thing, i was confused on what side to put my variable on but now i see that i can put it on either side
*January 4, 2010*

**7th grade math**

"x" is the variable 11x=8x-6
*January 4, 2010*

**7th grade math**

"x" is the variable 11x=8x-6
*January 4, 2010*

**science**

I am not sure the exact anwser but this is a generalization, they have certain adaptations to help them survive in their environment. So their adaptation to water is walking onn it.
*January 4, 2010*

**8th grade math**

Thanks Dr. Bob222.
*September 30, 2009*

**8th grade math**

Light travels approximately 5.87 X 10^12 miles in one year. This distance is called a light year. Suppose a star is 2 X 10^4 light years away. How many miles away is that star? Please help with detailed steps to solve problem. Thanks.
*September 30, 2009*

**8th grade math**

Light travels approximately 5.87 X 10^12 miles in one year. This distance is called a light year. Suppose a star is 2 X 10^4 light years away. How many miles away is that star? Please help with detailed steps to solve problem. Thanks.
*September 29, 2009*

**8th Grade Math**

How do you solve this equations? (xy^-3)^-5 (3x^4)(4x^12) ab^-6 ______ c^0d^-4 x^3y^0(z^-4) Can you please show it step by step? Thanks.
*September 26, 2009*

**1st grade**

Some schools offer progras where they can have a tutor come and help your child, or set them up with KUMON it's a great program that also helps with math and reading of course.Speak to your childs teacher and principal to see if the teacher will promote your child to read ...
*September 25, 2009*

**social studies - geography**

How did texas geography affect the native american in the gulf coast?
*September 17, 2009*

**4th grade**

What was the Geography and Climate in 1600-1700 Colonial America?
*February 2, 2009*

**6th grade math**

How do I find a unit rate?
*December 8, 2008*

**Math**

Find the indicated outputs for f(x)= 5x^2-2x The 2 after the ^ is an exponent. f(0)=0 f(-1)= f(2)=
*August 3, 2008*

**Math**

-25 ¡Ü 4x-8 ¡Ü-1 The solution is {x|-17/4 ¡Ü x ¡Ü 7/4
*August 3, 2008*

**Math**

Find the indicated outputs for f(x)=5x^2-2x. f(0)= f(-1)= f(2)=
*August 2, 2008*

**Math Geometry**

375
*July 24, 2008*

**Math Geometry**

the area of a triangle is 1/2 bh find the area of the given triangle: when b=50 inches h= 15 inches
*July 24, 2008*

**Integers**

9 - -9 =
*April 17, 2008*

**math**

ok maybe this is clearer.... [40/(2+i)]-[35/(2-i)]
*December 16, 2007*

**math**

40 35 - 2+i 2-i How do I solve this? there is a division sign between the 40 and 2=i and another one between 35 and 2-i
*December 16, 2007*

**math**

Help! I am gettting a C in math and I am so cofussed! How do I study better but have fun while I do it? I love math, I take it as a game, I take the #'s and use their equations. I know you might not like problem solving q?, but try to get a tutor & I know u can do it. GOOD...
*November 13, 2006*

**help**

hi i just need help with what the greatest common factor of 51 and 34 is 4+0
*November 7, 2006*

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