Homework answers and tutorials

Waiting for answer Which sample of fluorine gas, F2, contains the greatest numb...
Let's use the symbol ##N_A##, where ##N_A## ##=## ##6.022xx10^23##. A. there are approx. ##1/3N_A##, INDIVIDUAL ##F_2## molecules. B. there are approx ##1/12N_A##, INDIVIDUAL ##F...
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Waiting for answer How do you prove ##(1tanx)/(1+tanx) = (1sin2x)/(cos2x)##?
Use the following facts: ##tanx=sinx/cosx## ##sin2x=2sinxcosx## ##cos2x=cos^2xsin^2x## ##sin^2x+cos^2x=1## So you get: ##(1sinx/cosx)/(1+sinx/cosx)=(12sinxcosx)/(cos^2xsin^2x)## ##(cosxsinx)/cancel(cosx)*cancel((cosx))/cancel((cosx+sinx))=(12sinxcosx)/((cosxsinx)cancel((cosx+sinx)))## Taki...
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Waiting for answer Why does the entropy is defined by q reversible? what is the...
is defined as ##\mathbf(DeltaS = q/T),## where the definition separates as ##DeltaS (q_"irr")/T,## ##DeltaS = (q_"rev")/T,## with ##q_"irr"## being the inefficient, irreversible heat flow, and ##q_"rev"## being the efficient, reversible heat flow. ENTROPY VS HEAT FLOW By definition,...
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Waiting for answer If sin theta = 3/5 and theta is acute, how do you calculate...
##costheta=4/5, and, tantheta=3/4##. We will use the Identity ## : sin^2theta+cos^2theta=1##. ##:. cos^2theta=1sin^2theta=1(3/5)^2=19/25=16/25## ##:. costheta=sqrt(16/25)=+4/5...
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Waiting for answer How do polyatomic ions get their charge?
have a charge because they have more or fewer valence electrons than the neutral atoms that make up the ions. The most common polyatomic cation is the ammonium ion, ##"NH"_4^+##....
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Waiting for answer Is uniform circular motion in equilibrium?
(first answer) No. For a system to be in equilibrium, there must be NO . In uniform , we must have at least centripetal acceleration because the direction is constantly changing. See the physics classroom for more information on circular motion: http://www.physicsclassroom.com/class/circles/L...
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Waiting for answer How do you solve titration problems?
Watch this video! I would highly recommend that you watch the following video where I fully explain the acidbase titration experimentally and the calculation that should be carried...
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Waiting for answer How do you simplify ##(16 times r ^3 times t ^2) /( 4 times...
##4r^2t## Using the ##color(blue)"law of exponents"## ##color(orange)"Reminder " color(red)(bar(ul(color(white)(2/2)color(black)(a^m/a^n=a^(mn))color(white)(2/2))))## ##rArr...
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Waiting for answer How do you find the area of a regular octagon inscribed in a...
##25sqrt2## The radius of the circle is 5. Each side of the regular octagon subtends ##45^o## at the center. The lines joining opposite vertices are diameters. These diameters divi...
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Waiting for answer How do you simplify the expression ##(sinxcosx)/(sinxcosx)#...
##frac{sinxcosx}{sinx cosx} = secx  cscx## ##frac{sinxcosx}{sinx cosx} = frac{sinx}{sinx cosx}  frac{cosx}{sinx cosx}## ##= frac{1}{cosx}  frac{1}{sinx}## ##= secx  cscx##
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Waiting for answer What is the difference between cosmic background radiation a...
Cosmic background radiation is the rediation permeating our universe and originatad at the moment of . Red Shift refers to a phenomenon where radiation detected by an observer can have a different frequency compared to the original emitted by a moving object....
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Waiting for answer How do you calculate freezing point depression?
You use the formula for freezing point depression. EXAMPLE What is the freezing point depression caused by adding 31.65 g of sodium chloride to 220.0 g of water. ##K_"f"## for wat...
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Waiting for answer What is immunity?
The colossal task of keeping the body safe from outside and inside attacks of , virus, and other nasty creatures belongs to the immune system. Your skin and mucous membranes are the first line of defense between invaders entering through the skin or through openings in the body. A second line of...
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Waiting for answer How do you find the indicated sum of a geometric series?
Calculate the common ratio of the sequence. This is referred to as r. Your strategy to find r depends on how much you already know about the sequence. If you know the first and second term, divide the second term by the first term to find the common ratio. it might be in any for if it is in a perce...
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Waiting for answer What is Integration Using Simpson's Rule?
Simpson's Rule will give you a better approximation of the integral than the other basic methods. The other methods are Rectangular Approximation Method (RAM)  left, middle, and right; and the Trapezoidal Rule. Numerical integration is used when we are given a set of data (evenly spaced on the in...
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Waiting for answer How do I factor using the zero factor property?
The states that if ##ab=0##, then either ##a=0## or ##b=0##. Example: find the roots of ##x^2x6##. ##x^2x6=0## ##(x3)(x+2)=0## Now, the zero factor property can be applied, since two thing are being multiplied and equal zero. We know that either ##x3=0color(white)(ssss)## or ##color(wh...
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Waiting for answer How do fungi reproduce?
As Hifas são longas células cilíndricas com vários núcleos (cenocíticas) ou septadas, mas onde cada célula pode ter vários núcleos, podendo também ser simples ou ramificadas. Para além de terem a função de fixar ao solo e de participar na digestão extracelular, as hifas são as responsáveis pela repr...
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Waiting for answer What was the ThreeFifths compromise at the Constitutional C...
The delegates agreed that slaves would count as 3/5 of a person for the purpose of calculating a state's population. A lot of debate at the Constitutional Convention centered around...
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Waiting for answer What are some examples of neurons?
Aside from the types of neurons according to function mentioned, we have the types of neurons according to structure The types of neuron according to structure are: Multipolar  t...
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