Thursday

July 31, 2014

July 31, 2014

Total # Posts: 299

**Chemistry**

How many moles are in 12.0 grams of Potassium Sulfide?

**Science n math**

What is the molecular geometry n the electron domain for HCN

**Math**

An inner tube for a bicycle has a diameter of 2 inches and measures about 82 inches along its circumference. What formula would you use to determine the numbers of cubic inches of air the inner tube can hold

**Math**

An inner tube for a bicycle has a diameter of 2 inches and measures about 82 inches along its circumference. What formula would you use to determine the numbers of cubic inches of air the inner tube can hold

**Chemistry**

THE RATE LAW FOR THE REACTION 2NO + 02 = 2NO2 IS FIRST ORDER IN OXYGEN AND SECOND ORDER IN NO. PROPOSE A MECHANISM IN WHICH EACH STEP IS BIMOLECULAR. SPECIFY THE SLOW STEP. I HAVE NO IDEA WHAT TI DO. HELP PLEASE? THANKS.

**Chemistry**

2 HCl react with 1 Zinc Single replacement rxn So 2.

**Calc**

I think.... A) -12 B) 1 C)-7

**Chemistry**

An 8.00 mass % aqueous solution of ammonia has a density of 0.9651g/ml. Calculate the molality, molarity, and mole fraction of NH3. This question seems simple but I cannot seem to remember how to do this. Help please?

**chem**

An industrial chemist is studying smAll organic compounds for their potential use as an auto antifreeze. When 0.243g of a compound is dissolved in 25.0 ml of water, the freezing point is -0.201 degree celcius. (A) Calculate the molar mass of compound (dH2O= 1.00g/ml) at temp o...

**trig**

Basically the arcsin is the same as sin^-1 so the sin^-1(.5)= 30 degrees You can use a unit circle or a 30-60-90 triangle to figure it out.

**trig**

How do i solve this equation over the interval [0degrees,360) cot(theta)+2csc(theta)=5

**math (taylor polynomials)**

Find the degree 3 Taylor polynomial T3(x) of the function f(x)=(7x+50)4/3 at a=2 Find the second-degree Taylor polynomial for f(x)=4x2−7x+6 about x=0 thank you! (:

**Math (linear approximation)**

Find a linear approximation of the function f(x)=(1+x)^(1/4) at a=1, and use it to approximate the numbers (.95)^(1/4) and (1.1)^(1/4). Round your answers to the nearest thousandth Cheers in advance!

**CHEM**

Compare the value you obtained from average bond energies: (260Kj) to the actual standard enthalpy of formation of gaseous benzene, 82.9 kj. What does the difference between these two values tell you about the stability of benzene?

**MATH**

You can plug in zero for x and solve for y. then plug in zero for y and solve for x to get your values for x and y. x=200 y=-100

**Further calculus**

1) A price p (in dollars) and demand x for a product are related by 2x^2+6xp+50p^2=10600. If the price is increasing at a rate of 4 dollars per month when the price is 30 dollars, find the rate of change of the demand. 2) a) The price (in dollars) p and the quantity demanded q...

**Calculus**

sorry accidentally reposted!!

**Calculus**

Answers to any of these questions would be of great help! (: 1 a) At noon, ship A is 150km west of ship B. Ship A is sailing south at 50km/h and ship B is sailing north at 30km/h. How fast is the distance between the ships changing at 4:00pm? b) A spotlight on the ground is sh...

**Calculus**

thank you steve!

**Calculus**

Answers to any of these questions would be of great help! (: 1 a) At noon, ship A is 150km west of ship B. Ship A is sailing south at 50km/h and ship B is sailing north at 30km/h. How fast is the distance between the ships changing at 4:00pm? b) A spotlight on the ground is sh...

**graphing**

Can someone explain what quadrant this would be in and the domain and range. I have no idea how to graph it. G(x)= -3sin^-1 (2x)

**Trigonometry**

Oh okay thanks!

**Trigonometry**

Write as an algebraic expression in u. Tan(cos^-1 u)

**MATH**

-8. Plug in -6 for x and solve.

**Quantatative Analysis**

Use M1V2=M2V2 Plug in your given molarity and volume and solve for V1.

**Trigonometry**

Oh okay thanks a lot:) I was distributing sec and couldn't' get anywhere. I didn't think of writing it like that.

**Trigonometry**

Prove identity. Sec(pi-x)=-sec x

**TRIG**

Verify the following identity. 1) sin(x+y) __________ = tanx+tany cosxcosy 2) Write cos3x in terms of cosx I cannot figure out how to solve for identities they are so hard. Any help appreciated!:)

**Chemistry 105**

Use Boyles Law. P1V1=P2V2 (33.0L)(1.1atm)=(P2)(10.0L) and solve for P2.

**TRIG**

1) Find an angle that makes the statement true: costheta =sin(3theta+10degrees) 2) Verify this proof: sec(Pie -x)= -secx Can someone show me how to solve for these. Very much appreciated!

**chemistry 105**

Use the ideal gas law.. PV=nRT and solve for moles of N2 SO.... (1.00atm)(.0599L)=n(0.0821L*atm/mol*K)(273K) solve for n. then use "n" moles of N2 and then set up an conversion factor. so.... ___moles of N2 x( 6mol Li/2mol N2) x (MolarMass Li/1mol of Li) Then that gi...

**math2 calc**

Let f(x) be the function 11x2−9x+7. Then the quotient f(6+h)−f(6)h can be simplified to ah+b for: a= and b=

**Math- calculus**

Suppose f is a function which satisfies the properties: f(x+y)=f(x)+f(y)+x2y+xy2 for all real numbers x and y, and limx→0f(x)x=1. f′(x) thanks in advance!

**chem**

A student placed 12.0grams of glucose in a flask added enough water to dissolve glucose by swirling then added additional water until the .100 ml mark. A 60.0ml sample of this glucose soon was diluted to 0.500 L. How many grams of glucose are in 100. ml of the final solution.

**DRAMA**

Tragedy- the fall of a tragic hero Comedy- funny based on words

**trig**

Given the radius of a wheel is 12inches and the angular speed is measured to be 3pie/4 radiant per second, find the linear speed of the piece of gum stuck to the where. Give both an exact answer. And a decimal answer rounded to 4 decimal places.

**trig**

An automobile windshield washer 10inches long rotates an angle of 60degrres. If the rubber part of the blade only covers the last 9inches of the wiped, find the area of the windshield cleaned by the wiper.

**Chemistry - - Hydrocarbons**

oh then when you number your chain. CH is number 3. SO you would call the organic compound..... 3-MethylHexane

**Chemistry - - Hydrocarbons**

you count the longest chain so it will be the carbon chain of six. so hexane and then you have CH3 attached so it would be MethylHexane i believe.

**Chemistry 1**

the answer is 13180. you do what is in parenthesis first and round it 3sf and get 3770 and then add 9413.4... and then round to least number of decimal places so you would get 13180

**Trig**

how do i find the exact value of s [pie/2, pie] sin s = radical2/ whole number 2 what is s in radians? how do i figure this out without the use of a calculator. I drew the graph and located it in the second quadrant and i think the triangle is a 45-45-90 but i don't how to...

**chemistry**

combustion analysis of a hydrocarbon produced: 33.01 g CO2 and 13.51 g H2O Calculate the empirical formula of the Hydrocarbon. I got CH5 but that doesn't seem right? how do i do this problem?

**Chemistry**

well you have dipole-dipole London Dispersion and hydrogen bonds. you just classify which forces each are by reading your definitions of the three. LD are the weakest forces Hydrogen bonds are when two hydrogen bond with one another which is strong dp-dp forces are between one...

**Math**

...you multiply 4 by 3 to get 12 for your total of face cards.

**Math**

since there is 52 cards in a deck and you know there is 4 of each kind. you just set it as a fraction.

**Chemistry**

oops...* Assuming no other rxn's what mass of CO2 was produced in this rxn?

**Chemistry**

You carefully weigh out 19.00 of powder and add it to 76.95 of solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 88.16 . The relevant equation is CaCO3+2HCl ----> H2O + CO2 + CaCl2 Assuming no other ...

**Math**

you plug in -8 for r. I -15- (-8) l + l -8 l l -7 l+ l-8 l since you have absolute value bars anything in absolute value turns positive and you take away the bars. soo....... 7+8 =15

**Scientific Notation**

For scientific Notation, when expressing the number it cannot be greater then10. You usually put the decimal in the tenths spot such as 1.0, 2.0, 3.0 etc. you would imagine that your decimal is at the end of the number and then move your decimal toward the end. the exponent re...

**Trigonometry**

You draw a triangle and label all of your given information. so you subtract 90 from 38degree35' to get angle A. then you use SOH CAH TOA tan 38degree35'= b/6.434mi to solve for side b. then use cos38degree35' = 6.434mi/c to solve for side c.

**math**

A: -1/2= 1/2 #: 4 = 1/4 C: 0=0

**CHEMISTRY!!!!!!! HELP PLEASE:)**

How many kilograms of chlorine are in 24 kg of each of the following chlorofuorocarbons (CFCs)? 1) CF2CL2 express answer using two sig figs how would i solve for this problem??? thanks!

**Chemistry**

you would use 1 Hz =299792458wavelength meters so using that you would convert kHz to Hz, then Hz to meters. for the radio wave in meters then you would continue using the same conversion as the one above and then convert meters to nanometers using 1m= 1X10^-9 nm. for the last...

**math**

thats correct.

**chemistry**

you would divide the grams of each molecule produced by the smallest ratio to find the subscripts.

**chemistry**

empirical formula is the smallest whole number ratio molecular formula is the empirical doubled i believe.

**Math**

you would do... combine the i"s and the whole numbers together. (8-4)+(-i+i)= 4

**PreCal**

Combine the whole numbers and the i's (7+-8) + (-7i+-2i) =-1+-9i

**mathematics**

Area of what kind of shape? it depends on the shape for the formulas for area. A=pie X r^2 for a square. V= LXWXH so to find your area you would need the radius.

**trig**

nevermind, figured it out.

**trig**

oh and its in degrees.

**trig**

find the exact values of the six trig functions of the angle. -750 sin(-750)= cos(-750)= tan(-750)= csc(-750)= sec(-750)= cot(-750)= I've tried this question over and over again and i cannot get it right. i believe -750 is in the fourth quadrant but I'm not sure. can s...

**Chem**

water is the base(H+ acceptor) and C2H4O2 is the acid(H+ donor) so Hydronium is the conjugate acid and C2H3O2 is the Conjugate base.

**algebra**

48-40x= -24x+48 add 40x from both sides.... 48= 16x +48 subtract 48 from both sides... 0= 16x 0=x

**trig**

find a value of interval in degrees cotalpha=1.3692847 alpha=0.023903 is that correct?

**trig**

degrees

**trig**

find the value of alpha cotalpha=1.3692847 is 0.023903 correct?

**trig**

find reference angle 111degrees and -105 does it equal =75? i don't know the first one

**trig**

suppose theta is in the interval (90,180 degrees) find the sign of csc(-theta) is it positive or negative = positive???

**trig**

use a calculator to find the decimal approx. (roud 8decimal places) : sec28°6' does it equal 1.13362379 or 87.99624264 ???

**Pre-Calc-Please check my answer**

I believe you are trying to factor the polynomial. so x^2 -4x+3 (x-1)(x-3) =0 x= 1,3

**trig**

the length of the base of an isosceles triangle is 30.42 inches. each base is 26.54 degrees. find the length of the two equal sides of the triangle to the nearest hundredths. i get 15.19. is that right?

**trig**

find all values of theta in the interval (0,360) that have the given value: sintheta= √2 ______ 2

**maths**

i think 4.631 or 4.6309 depending on sig figs.

**math**

For Calculating Percentages: You can for example change 4.89 to .00489 % by moving the decimal two places. or for science we usually divide the part of mass/ the whole and times it by 100 to get percentages. Calculating ratios: you can set up a proportion by.. x/30 = 1/3 and c...

**Trig**

find the exact values of the six trig functions of angle... sin(-315degrees) how do i do this?

**Trig**

assume A= alpha using complementary rule how do I solve for alpha? cos(2A+40) =sin(3A-60) I don't understand how to start the question. What are the steps in solving for alpha. Do i get cos to equal sin somehow?

**CHEMISTRY:))))**

A rock is 5.0% by mass fayolite(Fe2SiO4), 7.0% by mass forsterite(Mg2SiO4) and the remainder silicon dioxide. What is the mass percent of each element in the rock? I have the answers but i don't know how to solve the problem. How would you in steps solve the problem?

**chemistry **

Combustion rxn's produce carbon dioxide and water for their products.

**science**

WE BREATH AIR. WHICH IS COMPOSED OF OXYGEN,NITROGEN,ETC...

**algebra**

Post your answers and i can check them if you want.

**algebra**

For 2004: the deaths:.... y=-1777(4)+27153 Solve for y. For 2009: deaths.... y=-1777(9)+27153 solve for y. To find the number of deaths in years... 7606=-1777x +27153 and solve for x.

**Chemistry**

If you determine the volumes of these three ionic compounds, NaCl has the greatest volume. AlCl3--Has four ions MgCl2--has 3 NaCl-has 2 Salt can hold more Na+ to Cl- collisions. which form ionic compounds since there is a greater volume.

**7th grade science**

1) you might ask yourself, was my hypothesis correct, does my data seem reliable, was the experiment data reflect the law or theory proposed.

**Chemistry**

10loadsX6quartersX1hr.X60minX1shift _____________________________________ 1loadX4quartersX6dollarsX1hr.X75minutes equals the amount of shifts.

**Chemistry**

3.00X10^8 m X 1mileX 60secX60min ____________________________________ 1secX1610mX1minX1hr. equals mile/hr.

**Chemistry**

1foot = 0.305 what? units please. 164m^2 X 100cm^2 X 1in^2 X 1ft^2 _____________________________ 1m^2X 2.54cm^2X 12in^2 if you still need help post your work.

**Chemistry**

what are you units for speed of light?

**science**

you're welcome:)

**science**

a Conclusion is. is there choices?

**chemistry**

Use a conversion factor. You need the formula of sugar to solve for it. 9grams 1mol 6.022X10^23 formulaUnits X _____ X ___________ g of sugar 1mol ... __Formula units X atoms of oxygen ________________ 1formula unit then you get your answer in atoms of O.

**Chemistry**

A rock is 5.0% by mass fayolite(Fe2SiO4), 7.0% by mass forsterite(Mg2SiO4) and the remainder silicon dioxide. What is the mass percent of each element in the rock? I have the answers but i don't know how to solve the problem. How would you in steps solve the problem?

**math**

Use PEMDAS for operations. P-arentheis E-xponents M-ultiplication D-ivision A-ddition S-ubtraction So distribute the 6 first to 2z-9. And then combine like terms.

**Chemistry**

TO FIND THE % OF THE ATOM THAT THE NUCLEUS MAKES UP YOU NEED TO DIVIDE THE MASS OF THE PART YOU ARE TRYING TO FIGURE OUT BY THE WHOLE MASS OF THE NUCLEUS TIMES 100.

**geometry**

THE QR WITH THE LINE OVER IT REFERS TO A SEGMENT OF A LINE. JUST QR IS REFERRING TO A SIDE USUALLY OF A SHAPE.

**chemistry**

You have to use the combined gas law. (V1)(P1) / T1 = (V2)(P2) / T2 AND YOU PLUG YOUR GIVEN INTO THE EQUATION. (1910ML)(740TORR) / -22.8 = (V2)(740TORR) / 285DEGREES AND SOLVE FOR V2.

**english**

I think it's "they." Can the simple subject also be the complete subject?

**word processing **

For Letters--use single space For Reports----MLA Format-Double spaced

**algebra**

plug in your x and y values into the equation and solve. 2(15)+7(3) / 30.

**science**

atomic number = protons of element

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