Thursday

December 8, 2016
Total # Posts: 113

**Chemistry**

If you mix 50.0 mL of a 0.500 M solution of calcium nitrate with 150. mL of a 0.250 M solution of potassium nitrate, what would be the resulting molarity of nitrate ions in the final mixed solution ?

*January 24, 2016*

**science**

how many atoms of S are there in 3 (NH4)2 SO4

*October 27, 2015*

**Physics**

You would like to shoot an orange in a tree with your bow and arrow. The orange is hanging 5.00 m above the ground. On your first try, you fire the arrow at 32.0 m/s at an angle of 30.0° above the horizontal from a height of 1.10 m while standing 52.0 m away. Treating the ...

*September 30, 2015*

**math**

write the number in two other forms 6,007,200 and 32,005,008

*September 1, 2015*

**math**

write this number in word form 310,763,136 write this number in expanded form 20,484,163

*September 1, 2015*

**math**

write the number in two other forms 6,007,200 and 32,005,008

*September 1, 2015*

**math**

sam makes $400 per week plus $20 commission on each new cell phone plan she sells. Write an equation to determine how many plans she sold to earn $680 last week.

*October 20, 2014*

**Physics**

A boat beguins on the best side of a river and heads straight east across the river with a speed of 1.9 Ft/s (relative to the water). the river water flows NORTH at the speed of 2.^ Ft/s (relative to the shore). The resultant veliocty of the boat ( relative to the shore) is ...

*October 8, 2014*

**math**

write this number in two forms 6,007,200 and 32,005,008

*August 26, 2014*

**Algebra with pizzazz**

it has diabetes

*July 17, 2014*

**physics**

At t = 0, an automobile traveling north begins to make a turn. It follows one-quarter of the arc of a circle of radius 10.1 m until, at t = 1.64 s, it is traveling east. The car does not alter its speed during the turn. (a) Find the car's speed. (b) Find the change in its ...

*January 28, 2014*

**Magnetism**

A circular wire loop of mass M and radius R carries a current I. It hangs from a hinge that allows it to swing in the direction perpendicular to the plane of the loop. A uniform magnetic field B exists everywhere in space pointing upwards. What angle θ does the plane of ...

*December 18, 2013*

**magnetis**

A metal spring can be used as a solenoid. The spring is stretched slightly, and a current is passed through it. The resulting magnetic field will cause the spring to a. collapse (shorten) b. stretch (lengthen) c. not change (nothing happens) d. ranslate along the current ...

*December 18, 2013*

**magnetism**

A charged particle with charge q is moving with speed v perpendicular to a uniform magnetic field. A second identical charged particle is moving with speed 2v perpendiculuar to the same magnetic field. The time to complete one full circular revolution for the first particle is...

*December 18, 2013*

**PHYSICS**

work out the velocity from right hand rule. Remember what current means in terms of conventional current.

*December 17, 2013*

**electricity and magnets**

Think about conventional current.

*December 17, 2013*

**magneismt**

what statements?

*December 17, 2013*

**Physics**

not yet

*December 16, 2013*

**Physics**

So did this work out Lora?

*December 16, 2013*

**PHYSICS**

That seems really small.

*December 15, 2013*

**PHYSICS**

whats h? is that the height 10 cm?

*December 15, 2013*

**PHYSICS**

There are two things in life, physics and everything else is stamp collecting.

*December 4, 2013*

**Magnetic effect**

Use kinematic equations for 1. Then you can work out the radius. For 2 what is the equation for potential energy of a magnetic field?

*November 25, 2013*

**science**

You have a pulley 13.9 cm in diameter and with a mass of 1.7 kg. You get to wondering whether the pulley is uniform. That is, is the mass evenly distributed, or is it concentrated toward the center or the rim? To find out, you hang the pulley on a hook, wrap a string around it...

*October 22, 2013*

**Chemistry**

2 moles of helium (He) are pumped from a gas canister into a weather balloon. The balloon at this point has a volume V1. 1 mole of nitrogen gas (N2) is added at the same temperature and pressure. The volume of the balloon changes to V2. How will the new volume of the balloon ...

*April 17, 2013*

**AP CHEM HELP**

When NH3 is added to solid Hg2Cl2, some of the mercury ions are oxidized and some are reduced. A reaction where the same substance is both oxidized and reduced is called a disproportionation reaction. Write equations for each of these half-reactions. HELP

*April 9, 2013*

**algebra 1**

just like normal equations

*April 9, 2013*

**physical science**

two cars 200meters apart drive towards one another. If one car travels at 12 meters/s and the other at 26 meters/s how long does it take for them to collide?

*April 7, 2013*

**10 grade algebra**

10(x+5)=130 x+5=130/10 x+5=13 x=13-5 x=8

*March 26, 2013*

**Maths**

I divide exactly by 100 my first two digits are equal the sum of my four digits is 8

*February 25, 2013*

**Chemistry**

2.00x10^-3

*February 19, 2013*

**Physics**

Vector A has a magnitude of 5.00 units, vector has a magnitude of 5.00 units, and the dot product A·B has a value of 16. What is the angle between the directions of A and ?

*January 20, 2013*

**nuclear chemistry**

I know this is too late for you Nancy and you Andrew, but I thought it might be useful for other students out there. So, to solve this problem we: First convert 1.0 MW to W then to J/s 1.0 MW x 10^6 W/MW x ((1.00 J/S)/W) = 1.0 x 10^6 J/s Next we use the binding energy equation...

*November 10, 2012*

**math**

if 400 customers come to a grand opening and every 5th customers receives a coupon for jeans and every 7th customers receives a coupon for a free sweater. how many customers will leave with both

*November 1, 2012*

**AP Chem**

(MnO40- + (C2O4)2- + H+ = CO2 + H2O + ? OR (MnO4)- + (C2O4)2-+ OH-=CO2 n+ H2O +? Can somebody please help me predict the products? I can balance it i just need help determining what to balance.

*October 23, 2012*

**Physics**

a driver sees a horse on the road and applies the brakes so hard that they lock and the car skids to a stop in 24 m. the road is level and the coefficient of kinetic friction between the tires and the road is 0.7. How fast was the car going when the brakes were applied?

*October 23, 2012*

**AP Chemistry**

thank you that was the only one that i couldn't get. that and number 7. im a little confused on how somebody could do that?

*October 17, 2012*

**AP Chemistry**

The Synthesis of an Iron Oxalato Complex Salt (“Green Crystals”) In this experiment you will synthesize a compound that will contain the elements potassium, iron, carbon, hydrogen, and oxygen. Carbon and oxygen will be present in the compound as oxalate (C2O4-2) ...

*October 17, 2012*

**math**

The height, h(t), of a projectile, in metres, can be modelled by the equation h(t) = 14t – 5t2, where t is the time in seconds after the projectile is released. Can the projectile ever reach a height of 9m? Explain.

*October 14, 2012*

**Math**

We are having an issue trying to solve for purple...

*September 12, 2012*

**Math**

A toy train has 20 cars- blue, purple and orange. There are 4 times as many blue cars as purple cars. There are 5 times as many orange cars as purple cars. How many of each color are there?

*September 12, 2012*

**5th grade religion**

...

*September 5, 2012*

**maths**

Marie can afford a $250 per month car payment. She’s found a 5 year loan at 7% interest. a. How expensive of a car can she afford? b. How much total money will she pay the loan company? c. How much of that money is interest?

*July 18, 2012*

**maths**

How much money will I need to have at retirement so I can withdraw $60,000 a year for 20 years from an account earning 8% compounded annually? a. How much do you need in your account at the beginning b. How much total money will you pull out of the account? c. How much of that...

*July 18, 2012*

**maths**

You deposit $1000 each year into an account earning 8% compounded annually. a. How much will you have in the account in 10 years? b. How much total money will you put into the account? c. How much total interest will you earn?

*July 18, 2012*

**maths**

How much would you need to deposit in an account now in order to have $20,000 in the account in 4 years? Assume the account earns 5% interest.

*July 18, 2012*

**Maths**

How do yo calculate a number to the power of 2.08 i.e. not a whole number. so 4 to the power of 2.08 Thanks.

*May 11, 2012*

**oceanography**

agreed

*March 1, 2012*

**chemistry **

The mole fraction of an aqueous solution of magnesium chlorate is 0.371. Calculate the molarity (in mol/L) of the magnesium chlorate solution, if the density of the solution is 1.39 g mL-1.

*February 28, 2012*

**chemistry**

calculate the pH of 20.00mL of 2.00 M HCl diluted to 0.500 L

*February 26, 2012*

**Chemistry**

The equilibrium constant for the reaction: 2NO(g)+Br2(g)<==>2NOBr(g) Kc=1.3x10^-2 at 1000 Kelvin Calculate Kc for: NOBr(g)<==>NO(g)+ 1/2Br2(g)

*February 26, 2012*

**Chemistry**

Calculate the [OH-] for a solution in which [H+] is 1000 times greater than [OH-]? and will the final result be acidic, basic, or neutral?

*February 25, 2012*

**Chemistry**

assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at -14.5 C? The freezing point for pure water is 0.0 C and is equal to 1.86 C/m .

*January 27, 2012*

**geometry**

Eg if EF=13cm

*January 20, 2012*

**physics**

2465

*December 19, 2011*

**AP Physics**

m1= mass of the bullet m2= mass of the block Vf=sqrt(2gh) v1= initial velocity of bullet v2= initial velocity of the block = 0 so first is conservation of momentum m1v1+m2v2=(m1+v2)Vf solve for v1 (note m2v2=0) v1=((m1+m2)/m2)/Vf to find Vf look at conservation of energy KE+PE...

*December 5, 2011*

**math**

whats 17.50x30

*November 21, 2011*

**chemistry**

In the following experiment, a coffee-cup calorimeter containing 100 mL of H20 is used. The initial temperature of the calorimeter is 23.0 C . If 3.60 g of CaCl2is added to the calorimeter, what will be the final temperature of the solution in the calorimeter? The heat of the ...

*October 20, 2011*

**chemistry**

the molarity of a solution composed of 25.4g KHCO3 diluted with water to a total volume of 200 mL

*October 18, 2011*

**chemistry**

A solution of .12 L of 0.160 M KOH is mixed with a solution of .3 L of 0.230 M NiSO4. the equation for this reaction is: 2KOH (aq)+NiSO4 (aq) ----->K2SO4 (aq)+Ni(OH)2 (s) .89 grams of Ni(OH)2 precipitate form I need to know the concentration remaining in the solution of: 1...

*October 14, 2011*

**Chemistry 101**

A solution of .12 L of 0.160 M KOH is mixed with a solution of .3 L of 0.230 M NiSO4. the equation for this reaction is: 2KOH (aq)+NiSO4 (aq) ----->K2SO4 (aq)+Ni(OH)2 (s) .89 grams of Ni(OH)2 precipitate form I need to know the concentration remaining in the solution of: 1...

*October 14, 2011*

**chemistry**

A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 400 mL of a solution that has a concentration of Na+ ions of 1.00 M?

*October 13, 2011*

**math**

Find the slope of the line passing through the points A(-4, 3) and B(4, 2)

*August 30, 2011*

**science**

what dose porosity mean?

*June 5, 2011*

**math**

1/3

*May 2, 2011*

**CHEMISTRY URGENT!!!**

Determine the pH (to two decimal places) of the solution that is produced by mixing 30.3 mL of 1.00×10-4 M HBr with 829 mL of 5.77×10-4 M Ca(OH)2.

*March 23, 2011*

**Chemistry **

A mixture containing CH3OH, HF, CH3F, and H2O, all at an initial partial pressure of 1.04 atm, is allowed to achieve equilibrium according to the equation below. At equilibrium, the partial pressure of H2O is observed to have increased by 0.43 atm. Determine Kp for this ...

*March 9, 2011*

**Chemistry **

Determine the volume (in mL) of 0.844 M hydrochloric acid (HCl) that must be added to 38.0 mL of 0.650 M sodium hydrogen phosphate (Na2HPO4) to yield a pH of 6.92. Assume the 5% approximation is valid and report your answer to 3 significant figures. Look up pKa values.

*March 9, 2011*

**algebra**

9x-12 = 78 (add 12 to both sides) 9x-12+12 = 78+12 (divide by 9 to isolate x) 9x=90 9x/9 = 90/9 x = 10 Check * 9(10) - 12 = 78 (9 x 10) - 12 = 78 90 - 12 = 78 78 = 78

*March 2, 2011*

**Chemistry **

Determine the molarity (in mol/L) of NO2− ions in solution when 9.77×101 g of sodium nitrite is added to enough water to prepare 3.94×102 mL of the solution.

*March 2, 2011*

**Physics II**

Jose, whose mass is 75 kg, has just completed his first bungee jump and is now bouncing up and down at the end of the cord. His oscillations have an initial amplitude of 11.0 m and a period of 4.0 s. From what height above the lowest point did Jose jump? k=185 n/m Vmax = 17 m/s

*March 1, 2011*

**chemistry**

The mole fraction of an aqueous solution of sodium dichromate is 0.367. Calculate the molarity (in mol/L) of the sodium dichromate solution, if the density of the solution is 1.42 g mL-1.

*February 25, 2011*

**Chemistry**

chemistry question. How many grams of silver sulfide can be produced by heating 45 grams of silver excess sulfer?

*January 9, 2011*

**physics**

A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. A passenger feels the seat of the car pushing upward on her with a force equal to 2.6 times her weight as she goes through the dip. If r = 20.0 m, how fast is the roller coaster ...

*November 23, 2010*

**physics**

a 5-kg crate is resting on a horizontal plank. the coefficient of static friction is .5 and the coefficient of kinetic friction is .4. after one end of the plank is raised so the plank makes an angle of 25 degrees with the horizontal, the force of friction is?

*October 26, 2010*

**3rd grade**

array for 5 times 1

*September 7, 2010*

**math**

we have a problem that my parents cant help with. 846*2=(...+40+...)*2=(800 over ...+...over2+6 over...)=(400+...+3)...=... ...means blank space for a number. Can you help with this problem, so that I can figure out the rest of the problems.Thanks

*August 31, 2010*

**5th grade**

how do you break apart to divide: 648 by 6 using compatible numbers to break apart the dividend.

*August 31, 2010*

**english**

what about The Story of My Life

*June 3, 2010*

**Music**

I need a new written add on verse of bob dylan chimes of freedom song has to be 8 lines long and the last line is An' we gazed upon the chimes of freedom flashing.

*May 29, 2010*

**algebra**

Its this symbol^ the computer on our webassign online doesn't recognize it so we need to replace that symbol^with a number so that's where I am lost

*February 23, 2010*

**algebra**

Need help showing me the steps without using the carrot function: Find the product. (2y + 2z)(2y - 3z)

*February 23, 2010*

**Math**

The area A of a triangle is given by the formula A=1/2bh If the base of the triangle with height 12 inches is doubled, its area will be increased by 48 square inches. Find the base of the orignial triangle.

*February 10, 2010*

**Math**

The area A of a triangle is given by the formula A=1/2bh If the base of the triangle with height 12 inches is doubled, its area will be increased by 48 square inches. Find the base of the orignial triangle.

*February 10, 2010*

**Gr.7 - math**

4. The dimensions of a king-size waterbed are 2.1m, 1.8m, and 23 cm. Find the volume and mass of the water it contains when full.

*January 5, 2010*

**7th grade**

5. What is the mass of the water? a. that fills a 1m^3 tank b. that fills a 2L bottle c. that would fill you empty classroom Thanks for your help!

*January 5, 2010*

**Literature**

I think your essay was good,but in the first paragraph you said "Throughout the year, the children that couldn’t afford designer clothes were made fun of constantly for their attire. Keeping up with the latest fashion trends was a must in our busy school and whoever ...

*December 28, 2009*

**Reading**

What is the definition of the word embers?

*October 21, 2009*

**science**

what is a ernmeyer flask and a granulated cylander used for?

*September 27, 2009*

**Friedman test: Can !?**

I have 28 participants. Each completed five tests. The maximum score a participant could receive on any one test was 4/4. The lowest score anyone could receive was zero. I will do a Friedman test for this paired data. My question: given that I have a very large number of ...

*August 13, 2009*

**English**

Thanks very much Bob. I much appreciate your taking the trouble to respond. All the best! Colin

*August 13, 2009*

**English**

I have 28 participants. Each completed five tests. The maximum score a participant could receive on any one test was 4/4. The lowest score anyone could receive was zero. I will do a Friedman test for this paired data. My question: given that I have a very large number of ...

*August 13, 2009*

**Geography**

Why is it drifting farther away

*November 15, 2008*

**Geography**

What is happening to the distance between Canada and europe

*November 15, 2008*

**Geography**

What is happening to the distance between Canada and Europe? Which plates meet near the west coast of Canada? In whihc direction are they moving?

*November 13, 2008*

**Geography**

Thank you

*November 13, 2008*

**Geography**

Name the five largest plates and on which plate Canada is located?

*November 13, 2008*

**10th grade**

Whatis the difference between the Hudson Bay Lowlands and the Arctic Lowlands?

*November 12, 2008*

**science**

potential energy is energy of _______ or chemistry?

*November 6, 2008*