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ALISON
Questions and answers by visitors named
ALISON
Questions (49)
An 8.00 mass % aqueous solution of ammonia has a density of 0.9651g/ml. Calculate the molality, molarity, and mole fraction of
5 answers
7,812 views
The mass of the earth is known to be about 5.98 X10^24kg assume that it is approx. spherical with an average diameter of
4 answers
1,466 views
A rock is 5.0% by mass fayolite(Fe2SiO4), 7.0% by mass forsterite(Mg2SiO4) and the remainder silicon dioxide. What is the mass
2 answers
487 views
dans cette figure on compte 8 triangle.Écris le nom de chacun d'eux.
1 answer
305 views
A car starts from rest and accelerates for 6.1 s
with an acceleration of 3.1 m/s2. How far does it travel? Answer in units of m.
2 answers
578 views
A rock is 5.0% by mass fayolite(Fe2SiO4), 7.0% by mass forsterite(Mg2SiO4) and the remainder silicon dioxide. What is the mass
3 answers
1,540 views
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
2 answers
505 views
find the exact values of the six trig functions of angle...
sin(-315degrees) how do i do this?
2 answers
644 views
find all values of theta in the interval (0,360) that have the given value:
sintheta= √2 ______ 2
4 answers
2,905 views
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
1 answer
405 views
use a calculator to find the decimal approx. (roud 8decimal places) :
sec28°6' does it equal 1.13362379 or 87.99624264 ???
1 answer
337 views
suppose theta is in the interval (90,180 degrees) find the sign of
csc(-theta) is it positive or negative = positive???
3 answers
2,390 views
find reference angle
111degrees and -105 does it equal =75? i don't know the first one
1 answer
312 views
find the value of alpha
cotalpha=1.3692847 is 0.023903 correct?
4 answers
353 views
find a value of interval in degrees
cotalpha=1.3692847 alpha=0.023903 is that correct?
1 answer
313 views
find the exact values of the six trig functions of the angle.
-750 sin(-750)= cos(-750)= tan(-750)= csc(-750)= sec(-750)=
4 answers
1,535 views
How many kilograms of chlorine are in 24 kg of each of the following chlorofuorocarbons (CFCs)?
1) CF2CL2 express answer using
5 answers
6,269 views
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
4 answers
2,888 views
combustion analysis of a hydrocarbon produced: 33.01 g CO2 and 13.51 g H2O
Calculate the empirical formula of the Hydrocarbon. I
4 answers
3,603 views
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
2 answers
515 views
An automobile windshield washer 10inches long rotates an angle of 60degrres. If the rubber part of the blade only covers the
3 answers
1,999 views
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
3 answers
383 views
A student placed 12.0grams of glucose in a flask added enough water to dissolve glucose by swirling then added additional water
2 answers
1,074 views
1) Find an angle that makes the statement true: costheta =sin(3theta+10degrees)
2) Verify this proof: sec(Pie -x)= -secx Can
2 answers
519 views
Verify the following identity.
1) sin(x+y) __________ = tanx+tany cosxcosy 2) Write cos3x in terms of cosx I cannot figure out
2 answers
544 views
Prove identity.
Sec(pi-x)=-sec x
6 answers
7,472 views
Write as an algebraic expression in u.
Tan(cos^-1 u)
4 answers
1,086 views
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)
1 answer
302 views
Compare the value you obtained from average bond energies: (260Kj) to the actual standard enthalpy of formation of gaseous
2 answers
542 views
How do i solve this equation over the interval [0degrees,360)
cot(theta)+2csc(theta)=5
3 answers
922 views
An industrial chemist is studying smAll organic compounds for their potential use as an auto antifreeze. When 0.243g of a
3 answers
977 views
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
2 answers
1,228 views
Determine the Concentration of OH^-1 and pH of a solution that is 0.140 M F^-1.
I did F- +H20 ---> HF + H20 but idk what to solve
3 answers
672 views
Determine the pH of each solution:
(a) 0.10 M NH4Cl can someone show me how to do this one so i have the idea of how to do the
2 answers
916 views
Determine pH of each solution:
b) 0.20 M CH3NH3I I did.... CH3NH3^+ +H2O -> CH3NH2 + H3O^+ 0.20 ---------------0--------------0
5 answers
7,469 views
Determine pH of each solution:
0.20 M KI i don't know how you know if you use.. K+H2O->KOH + H or... I- +H2O--> HIO +H Im
5 answers
2,175 views
A forming acid solution has a pH of 3.25. Which of these substances will raise the pH of the solution upon addition? Explain.
A)
4 answers
2,397 views
CALCULATE PH OF THE SOLUTION THAT RESULTS FROM EACH SOLUTION
A) 150.0mL OF 0.25M HF WITH 225.0 mL OF 0.30M NaF Help please, these
2 answers
559 views
1.CALCULATE pH of 1.0 L 0.010 M ascetic acid and 0.50 L 0.010 M NaOH.
2. Calculate pH of 1.0 L 0.010 M NaOH and 0.500 L 0.010M
1 answer
488 views
a) Calc. PH of 0.010 M HF and 0.030 M KF
e) calc. PH Zn(OH)2 in wAter
2 answers
508 views
Use long division :
(a^3-b^3)/ (a-b)
3 answers
334 views
I have to prove this: (a^3-b^3)= (a-b)(a^2+ab+b^2)
How do I use long division to get (a^2+ab+b^2). I'm given..... 1). (a^3-b^3)/
1 answer
299 views
Determine whether of not each compound will be more soluble in acidic soln than in pure water. Explain.
A). Hg2Br2 B). Mg(OH)2
4 answers
4,407 views
Consider a solution that is 0.022 M in Fe2+ and 0.014 M in Mg+2.
A). If potassium carbonate is used to selectively precipitate
4 answers
2,537 views
a 250.0ml buffer solution is 0.250M in ascetic acid and 0.250M in sodium acetate.
B). What is pH after addition of 0.0050mol of
2 answers
811 views
Write balanced net ionic equAtions.
D) zinc chloride and excess ammonia E) cupric phosphate and lots of ammonia A) ammonia and
4 answers
840 views
A rxn has delta H ^0 rxn=-112kj and delta S^0 rxn =354 J/K. at what temp is the change in entropy for the rxn equal to the
4 answers
1,041 views
1)Convert 1/20 of a circle to both degrees and radians.
All I have is 9/180 is what I come up with. 2) what fraction of a circle
4 answers
1,664 views
The wheels are connected BT a belt. One wheel has a radius of 10inches and is rotating 40rpm. If the other wheel has a radius of
1 answer
448 views
Answers (67)
I don't know what they form... D) ZnCl2+ NH3---> E) Cu3(PO4)2 +2NH4OH---> A) NH3+ ZnSO4--> I don't understand what it means by excess... How do I figure out what they form.
Set Kc = (x)(0.2-x)/(0.2-x) . Solve for x. 0.2-x is H2S equilibrium concentration
OH, okay so when I produce a strong acid and a strong base it is neutral so pH=7. Meaning the 0.20M KI doesn't even matter?
He got 62.5ml by making up a certain amount of volume for the 0.1M solution and setting it equal to the 0.08 NaOH( which is used to titrate the solution) and determined the amount of NaOH in milliliters needed until the solution hit its endpoint basically
2 HCl react with 1 Zinc Single replacement rxn So 2.
I think.... A) -12 B) 1 C)-7
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.
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
Oh okay thanks!
Use M1V2=M2V2 Plug in your given molarity and volume and solve for V1.
-8. Plug in -6 for x and solve.
Oh okay thanks a lot:) I was distributing sec and couldn't' get anywhere. I didn't think of writing it like that.
Use Boyles Law. P1V1=P2V2 (33.0L)(1.1atm)=(P2)(10.0L) and solve for P2.
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)
Tragedy- the fall of a tragic hero Comedy- funny based on words
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
oh then when you number your chain. CH is number 3. SO you would call the organic compound..... 3-MethylHexane
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.
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
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
oops...* Assuming no other rxn's what mass of CO2 was produced in this rxn?
...you multiply 4 by 3 to get 12 for your total of face cards.
since there is 52 cards in a deck and you know there is 4 of each kind. you just set it as a fraction.
A: -1/2= 1/2 #: 4 = 1/4 C: 0=0
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.
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
48-40x= -24x+48 add 40x from both sides.... 48= 16x +48 subtract 48 from both sides... 0= 16x 0=x
Combine the whole numbers and the i's (7+-8) + (-7i+-2i) =-1+-9i
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.
you would do... combine the i"s and the whole numbers together. (8-4)+(-i+i)= 4
thats correct.
you would divide the grams of each molecule produced by the smallest ratio to find the subscripts.
empirical formula is the smallest whole number ratio molecular formula is the empirical doubled i believe.
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=
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.
nevermind, figured it out.
oh and its in degrees.
degrees
I believe you are trying to factor the polynomial. so x^2 -4x+3 (x-1)(x-3) =0 x= 1,3
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
i think 4.631 or 4.6309 depending on sig figs.
Combustion rxn's produce carbon dioxide and water for their products.
you're welcome:)
WE BREATH AIR. WHICH IS COMPOSED OF OXYGEN,NITROGEN,ETC...
Post your answers and i can check them if you want.
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.
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.
1) you might ask yourself, was my hypothesis correct, does my data seem reliable, was the experiment data reflect the law or theory proposed.
10loadsX6quartersX1hr.X60minX1shift _____________________________________ 1loadX4quartersX6dollarsX1hr.X75minutes equals the amount of shifts.
3.00X10^8 m X 1mileX 60secX60min ____________________________________ 1secX1610mX1minX1hr. equals mile/hr.
