Monday

February 8, 2016
Total # Posts: 1,700

**Chemistry**

Gravimetric analysis does not always involve a precipitate. Consider the following problem. A mixture of calcium carbonate and calium oxide has a mass of 8.35 grams. When heated strongly, the CaCO3 in the sample decomposes into solid CaO and carbon dioxide gas. The calcium ...
*December 7, 2010*

**Chemistry**

Gravimetric analysis does not always involve a precipitate. Consider the following problem. A mixture of calcium carbonate and calium oxide has a mass of 8.35 grams. When heated strongly, the CaCO3 in the sample decomposes into solid CaO and carbon dioxide gas. The calcium ...
*December 6, 2010*

**science**

If you have 3 liters of air in your lungs and 2/10 of that is oxygen, how many millimeters are in your lungs?
*December 6, 2010*

**Precalculus Someone please help**

Evaluate all six trigonometric functions at t, where the given point lies on the terminal side of an angle of t radians in standard position. (40/41, -9/41)
*December 6, 2010*

**physics**

The drawing shows a hydraulic chamber in which a spring (spring constant = 1292 N/m) is attached to the input piston, and a rock of mass 24.7 kg rests on the output plunger. The piston and plunger are at the same height, and each has a negligible mass. By how much is the ...
*December 6, 2010*

**Physics**

A bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a frequency of 50.0 kHz, and if the speed of sound in air is 340 m/s, what is the smallest insect a bat can detect?
*December 5, 2010*

**Physics**

A object-spring system oscillates with an amplitude of 4.0 cm. If the spring constant is 210 N/m and object has a mass of 0.50 kg, determine each of the following values. (a) the mechanical energy of the system J (b) the maximum speed of the object m/s (c) the maximum ...
*December 5, 2010*

**Physics**

The blades of a ceiling fan have a radius of 0.399 m and are rotating about a fixed axis with an angular velocity of +1.65 rad/s. When the switch on the fan is turned to a higher speed, the blades acquire an angular acceleration of 2.08 rad/s2. After 0.520 s have elapsed since...
*December 4, 2010*

**physics**

The drawing shows a hydraulic chamber in which a spring (spring constant = 1292 N/m) is attached to the input piston, and a rock of mass 24.7 kg rests on the output plunger. The piston and plunger are at the same height, and each has a negligible mass. By how much is the ...
*December 4, 2010*

**physics**

What is the longest wavelength for standing sound waves in a 102.0 cm long tube that is open at both ends?
*December 4, 2010*

**ms.sue**

so it would b 11 then
*December 1, 2010*

**ms.sue**

if y+2=13 woudlnt you add 2 too both sides amd get y=15?
*December 1, 2010*

**Algebra**

whats the problem?
*December 1, 2010*

**math**

so if u flip it the negative sign will go away and turn it too positive
*December 1, 2010*

**math**

1/3b=-3 i know u would divide both sides by 1/3 and it would cancell out the 1/3 and when u divide 1/3 by -3 you will get -1/9 so u flip it u willl get -9 right?
*December 1, 2010*

**Math**

it would b 145,000 right?
*December 1, 2010*

**Algebra 1 **

u r right
*December 1, 2010*

**math**

wow i feel stupid
*December 1, 2010*

**math**

do u have too add or subtract the like terms bc if u subtract 5b-6b it will equal too -1b and then u subtract -6--7 it will equal too 1 so then it would b 1=-1b
*December 1, 2010*

**math**

-6+5b=6b-7
*December 1, 2010*

**algebra1**

then i get -21/1
*December 1, 2010*

**algebra1**

i get up too 1/3a=-7
*December 1, 2010*

**algebra1**

1+1/3a=-6
*December 1, 2010*

**math**

so it would b x=4
*December 1, 2010*

**math**

1/2x=2
*December 1, 2010*

**algebra1 **

hey damon i need help on mine thank u
*December 1, 2010*

**Algebra uno help please. :)**

where does the 8 come into the problem at?
*December 1, 2010*

**math**

8-7b=-6b+9
*December 1, 2010*

**College Algebra**

65437990
*December 1, 2010*

**physics help me please!**

i think it would be b too bc the degress dropps from 40 to 30 so im saying your right on b
*November 30, 2010*

**math**

Solve for x. -3x - 8 + 6x = 7
*November 30, 2010*

**algebra1**

-3+8x-8=-8 how do u solve it?
*November 30, 2010*

**physics**

what would the third longest be? cause i know that the second longest would be what you just said obviously, but the third one cant be half of that, or zero, so im a little confused
*November 30, 2010*

**physics**

What is the longest wavelength for standing waves on a 238.0 cm long string that is fixed at both ends?
*November 30, 2010*

**physicS**

What is the longest wavelength for standing waves on a 238.0 cm long string that is fixed at both ends?
*November 30, 2010*

**algebra1**

(w-9)*(w-4) im really struggling ppl plz help
*November 30, 2010*

**geometry**

solve this equation (w-9)*(w-4)
*November 30, 2010*

**Math**

Solve for x : 16y^2=120x-225
*November 28, 2010*

**Physics**

An FM radio station broadcasts at 80.9MHz. Determine the period of the radio waves. i know period is just 1/freq. so what would i convert 80.9 MHz into???
*November 27, 2010*

**Physics**

An FM radio station broadcasts at 80.9MHz. Determine the period of the radio waves. i know period is just 1/freq. so what would i convert 80.9 MHz into???
*November 27, 2010*

**college economics**

A decrease in aggregate supply means: A. Both the real domestic output and the price level would decrease B. The real domestic output would increase and rises in the price level would become smaller C. The real domestic output would decrease and the price level would rise D. ...
*November 27, 2010*

**chemistry**

the h20 and s02 you do not have any carbon though to work with it?
*November 23, 2010*

**chemistry**

What mass of carbon dioxide, water, and sulfur dioxide can be produced from the combustion of 1.5793g of C7H12S?
*November 23, 2010*

**Chemistry**

Suppose that a 10-mL sample of a solution is to be tested for Cl- ion by addition of 1 drop (0.2mL ) of 0.15 M AgNO3 . What is the minimum number of grams of Cl- that must be present in order for AgCl(s) to form?
*November 20, 2010*

**Chemistry**

Calculate the pH at the equivalence point in titrating a 0.120 M solution of NaHCrO4 (sodium hydrogen chromate) with 7.0×10−2 NaOH. Please help!
*November 20, 2010*

**Chemistry**

Calculate the pH at the equivalence point in titrating a 0.120 M solution of NaHCrO4 (sodium hydrogen chromate) with 7.0×10−2 NaOH.
*November 20, 2010*

**Chemistry**

Suppose that a 10-mL sample of a solution is to be tested for Cl- ion by addition of 1 drop (0.2mL ) of 0.15 M AgNO3 . What is the minimum number of grams of Cl- that must be present in order for AgCl(s) to form?
*November 20, 2010*

**chemistry**

12
*November 18, 2010*

**math**

48 divided by 3796
*November 16, 2010*

**organic chem**

convert butane to 3-pentanol using any reagents and organometalics.
*November 16, 2010*

**Chemistry**

Cl is gaining elections which means it is the reduction half reaction. Reduction is associated with the Cathode. E(cell) = E(cathode) - E(anode) 0.35v = 1.36v - E(anode) solving for E(anode) gives you 1.01v
*November 15, 2010*

**geometry**

Given quadrilateral ABCD, with A = 4x - 57 and C = x + 3, what value of x ensures that ABCD is a parallelogram?
*November 11, 2010*

**algebra**

How do you make 36 the area and 26 premeter
*November 10, 2010*

**math Dr. R**

ok. "what is 1/3 of $3900" and if i would be using a calculator how would i input it
*November 9, 2010*

**math**

if im trying to get the answer to "what is one third of 190" how would i input it on a calculator
*November 9, 2010*

**math**

yes, but iknow the answer, my issue is is how do i get answer if im trying to use a calculator
*November 9, 2010*

**math**

if im trying to get 1/3 from 190, how would i get the answere by calculator
*November 9, 2010*

**chemistry**

Help!! Can someone please show me how to set up this problem. I'm lost. C3H8+5O2-->3CO2+4H20 If 19.2g of C3H8 and 19.2g O2 react, how many moles of CO2 can be produced?
*November 5, 2010*

**chem**

How do you find out the final Fe
*November 4, 2010*

**college chemistry**

SWAG
*November 4, 2010*

**english**

Wut is a compound predicate
*November 3, 2010*

**Physics**

A woman runs a kilometer using a force of 210 N and a power output of 500 W. How long in minutes does it take this woman to complete 1 kilometer?
*November 2, 2010*

**chemistry**

so is is set up like 356.2J=25.0g(36.5C-22.0C) ?
*October 31, 2010*

**chemistry**

a 25.0g sample of magnesium at 22.0 degrees C absorbs 356.3 J of heat. The temperature of magnesium rises to 36.5 degrees C. What is the specific heat of the magnesium?
*October 31, 2010*

**biology**

Yes there still would have been a source of carbon dioxide being introduced into the water. "Carbon Dioxide is present in water in the form of a dissolved gas.Surface waters normally contain less than 10 ppm free carbon dioxide, while some ground waters may easily exceed ...
*October 28, 2010*

**Chemistry**

Is it still a single displacement reaction? can you walk me thru predicting the reaction and then balancing it. I'm lost.
*October 27, 2010*

**Chemistry**

Can anyone tell me why the answer that I got here is not correct? Pb(s) + AgNO3(aq) yields Ag(s) + PbNO3(s)
*October 27, 2010*

**3rd grade shurley english**

what does s, f,scs, scv mean when indentifying(labeling) sentences thanks
*October 26, 2010*

**Signals**

I have the following information: H(jw) = (3+jw)/(e^(2jw)) f(t) = e^(-3t)u(t) Therefore, F(w) = 1/(3+jw) Y(w) = H(w)*F(w) = 1/(e^(2jw)) I have to find y(t), but I am having troubling finding.
*October 22, 2010*

**physics**

A model rocket is constructed with a motor that can provide a total impulse of 25.5 N · s. The mass of the rocket is 0.213 kg. What is the speed that this rocket achieves when launched from rest? Neglect the effects of gravity and air resistance.
*October 21, 2010*

**chemistry**

how many atoms are in 26 moles of Ag
*October 21, 2010*

**algebra**

I don;t know how to solve the following equation. 9+6x=-6x+105 I have -6x +6x -105 -105 -96=12x 12 12 x=8
*October 21, 2010*

**algebra**

I don;t know how to solve the following equation. 9+6x=-6x+105 I have -6x +6x -105 -105 -96=12x 12 12 x=8
*October 21, 2010*

**math**

how do you solve 0.32/8.64=
*October 18, 2010*

**math**

write an expression.there were22 students in the clsass but some were absent
*October 18, 2010*

**math**

find the value of expression 5+2+6 (8-7)+1 6-(3+1)
*October 18, 2010*

**11th grade**

vix = 4.33 viy = 2.5 vx = 4.33 viy = -2.5 vix= 5 * cos(30) viy= 5 * sin (30) vx= the same because no force is acting on it vy= -viy because nature of parabolic motion and ball is travelling down
*October 17, 2010*

**maths**

a fasrmer has 46 animals.He has fewer 6 sheep than pigs. how many pigs does he have?
*October 16, 2010*

**Organic Chemistry Lab**

The solid pellet will contain the waxes, cellulose, and salt crystals. The supernatant will contain the pigments, water, sugars,and starch.
*October 12, 2010*

**6th grade math**

Add one set of parentheses to the expression - 7 * x + 3 + 8 * x + 3 * x + 8 - 9 so that it is equivalent to 2(9x + 10)
*October 11, 2010*

**us history**

Distinguish between "older culture" and "new culture" present in 18th century colonial America, and discuss the value conflict that emerged between the two.
*October 11, 2010*

**organic chem**

7. An unknown compound, C8H14, is optically active. Hydrogenation of the unknown yields 4-methylheptane. Ozonolysis of the unknown yields ethanol and 2- methylpropandial. Suggest a structure for the unknown consistent with the above date. please help
*October 11, 2010*

**physics**

A boat initially traveling at 10 meters per second accelerates uniformly at the rate of 5.0 meters per second squared for 10 seconds. How far does the boat travel during this time?
*October 8, 2010*

**Chemistry**

The law of conservation of mass states that no change is observed in the total mass of the substances involved in a chemical change. Thus the mass of the sulfur dioxide produced is the same amount as the sulfur and oxygen that went in. Does this sound correct to answer my ...
*October 5, 2010*

**Chem**

Is this on the right track?.....mass cannot be created/destroyed, although it may be rearranged in space, and changed into different types of particles. This implies that for any chemical process in a closed system, the mass of the reactants must equal the mass of the products.
*October 5, 2010*

**Chem**

Sulfur burns in the presence of oxygen to produce sulfur dioxide. Explain how the mass of sulfur dioxide produced compares to the combined mass of sulfur and oxygen.
*October 5, 2010*

**physics/ math**

Water flows (v approx. 0) over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.
*October 5, 2010*

**physics**

A 120-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 400 N. For the first 17 m the floor is frictionless, and for the next 17 m the coefficient of friction is 0.34. What is the final speed of the crate?
*October 5, 2010*

**math**

explain how you could show five less than a number using an expression
*October 4, 2010*

**Chemistry 20**

If 40. kJ of energy are absorbed by 450 g of water at 16 oC, what is the final temperature of the water?
*October 4, 2010*

**Related Rates Problem**

your kind of really bad at this
*October 1, 2010*

**grammar**

what is the simple predicate in The insects bodies can turn wood into food?
*September 28, 2010*

**algebra**

the equation is f(x) = (1/sq. root of 1-x^2) 1. f(x) is never zero. 2. 0 is in the domain of f 3. All negative real numbers are in the domain of f 4. All positive real numbers are in the domain of f 5. 1 is in the domain of f 6. f(x) is never negative 7. f(x) is never positive...
*September 24, 2010*

**math**

r=13.14
*September 22, 2010*

**math**

-3.38=r-9.76
*September 22, 2010*

**science**

Water, Oil, and sediment
*September 20, 2010*

**German**

This was a worksheet and the instruction said to fill in the adjective endings, since the underlines wouldn’t show I put the spaces to be filled as parenthesis. The (-) means I think it does not need an ending and the (?) means im confused and not sure if it needs an ...
*September 19, 2010*

**Physics**

It should have read Physics as subject- I mistyped it-Please help me understand this
*September 18, 2010*

**Physcis**

An airplane flying at 120km/h due west moves into a region where the wind is blowing at 40km/h due east. If the plane's original vecotr velocity is Vplane, what is the expression for the plane's resulting velocity in terms of Vplane. a. 1/3 >Vplane b. 2/3>Vplane ...
*September 18, 2010*