Homework answers and tutorials

Waiting for answer Why does the cell divide twice in the process of meiosis?
Because the chromosomes are still duplicated after the first division. The second division cause the new cells to end up with half of the number of chromosomes of the parents cell. M...
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Waiting for answer What is the molar mass of ammonia (NH3)?
##"17.03052 g/mol"##. To determine the molar mass of any compound, all you have to do is add up the molar masses of every atom that makes up the respective compound. In this case,...
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Waiting for answer How can synthetic division be used to factor a polynomial?
Here is a reasonable PreCalculus example of to illustrate the concept. Let's say you had: ##2x^4  3x^3  5x^2 + 3x + 8## Like Joan said, there is a trial and error aspect to this. Look at all the coefficients, and think about what a common factor might be. If you don't get a zero remainder, t...
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Waiting for answer Are all equilateral triangles also isosceles triangles?
Yes, all equilateral triangles are also isosceles. By definition all sides of an equilateral triangle are equal in length and all angles are equal in degree measure. By definition...
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Waiting for answer How do you Find the Riemann sum for ##f(x)=sinx## on the int...
The Riemann Sum for this is: ##sum_(i=1)^n(pi/n)(sin((ipi)/n))## As ##nrarroo## this sum seems to be approaching 2. A Riemann Sum can be thought of as a generalization of the "area problem" that begins the subject of Integral Calculus. The area problem asks how one can find the area under a curv...
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Waiting for answer How can I identify iondipole forces?
It's very easy. To have a iondipole forces there should be a polar molecule and ionic compound Because iondipole forces occur due to presence of cations ,anions a polar molecule . By following image you can clear that idea. To have a cation anion there should be an ionic comp...
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Waiting for answer How to convert grams into kilograms?
Conversion between grams and kilograms is straight forward if you know the metric system number line. Grams are considered a standard unit and have the base of 10^0 equaling 1. Kilo is 10^3 equaling 1000. So, there are 1000g/1kg. If you want to convert from g to kg, then divide by the conversion...
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Waiting for answer How does atmospheric pressure affect boiling point?
When the is equal to the vapor pressure of water, the water will boil. Let's go back a second. "Vapor pressure" is just a term that's used when dealing with a liquid that's evaporating (i.e. becoming a vapor). Because this evaporated liquid is now a gas, it has a pressure like any other gas. If...
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Waiting for answer Is derp a real word or slang? It is my favorite word. Hopefu...
Yes it is. Apparently you can find it in http://www.oxforddictionaries.com/definition/english/derp . Even Bing and Google have defined meanings for the word. Type: "derp meaning".
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Waiting for answer Why are gram positive bacteria susceptible to penicillin?
Penicillin is an antibody of the fungus Penicillium that prevents gram positive from forming cell walls. Without a cell wall, the bacteria dies because it cannot maintain homeostasis. Gram positive bacteria have a thick peptidoglycan layer in their cell wall which differentiates them from gram neg...
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Waiting for answer Why are metallic compounds malleable?
Metals are described as malleable because they can be beaten into sheets. They are also ductile, as they can be pulled out into wires. This is because of the ability of the atoms to roll over each other into new positions without breaking the metallic bond. Metallic bonds result from the attracti...
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Waiting for answer How do you find the derivative for ##f(x)=sinxcosx##?
You can use the : if: ##k(x)=f(x)g(x)## ##k'(x)=f'(x)g(x)+f(x)g'(x)## In your case: ##f'(x)=cos(x)cos(x)+sin(x)(sin(x))=## ##=cos^2(x)sin^2(x)=cos(2x)##
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Waiting for answer What does the Hubble constant mean?
It means the rate of the expansion of the Universe. There is something called "Hubble's law" . It is an observational law and it shows a linear relation between distance and redshif...
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Waiting for answer How can I write the formula for magnesium sulfide?
Magnesium Sulfide has a formula of ##MgS##. Magnesium is a metal cation with a charge of ##Mg^(+2)## Sulfur is a nonmetal anion with a charge of ##S^(2)## In order to bond ionically the charges must be equal and opposite. It will take one 2 sulfide ion to balance one +2 magnesium ion forming a...
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Waiting for answer An oxygen atom has a total of 8 elections. How do you write...
You know that a neutral oxygen atom has 8 electrons . It's always helpful to write the for an element before trying to assign for each individual electron . As you can see in the image above, the for neutral oxygen is ##"O": 1s^(2) 2s^(2) 2p^(4)## Assuming you know the basics behind , you...
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Waiting for answer Calculate the pH at the equivalence point for the titration...
##"pH" = 5.13## You're titrating ammonia, ##"NH"_3##, a weak base , with hydrochloric acid, ##"HCl"##, a strong acid , so right from the start you should know that the at the equiva...
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Waiting for answer What is the energy in joules of a mole of photons associated...
##h=6.626##x##10^(34) J.s## ##c=3##x##10^8####ms^1## ## λ=486##x##10^9####m## 1 mol photons = ##6.023##x##10^23## photon Energy of one photon (##E##) = (##6.626##x##10^(34) J.s## x ##3##x##10^8####ms^1##)/(##486##x##10^9####m##) Energy of one mole photon (##E##) = (##6.023##x##10^23## x##6.6...
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Waiting for answer In pea plants, purple flower color (P) is a dominant allele,...
phenotype will be purple colour when we say that a trait is dominant it means that it require only one allele to be expressed where as when we say that a trait is recessive it means...
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Waiting for answer How do you find the exact value of ##tan ((pi)/2)##?
It does not have an exact value as it is undefined and diverges to ##oo##. The graph of ##y=tanx## has a vertical asymptote at ##x=pi/2## and so the limit ##lim_(x pi/2)tanx## does...
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Waiting for answer In the equation: Pb(no3)2(aq) + 2ki(aq) → pbi2(s) + 2kno3(aq...
##"PbI"_2## would not form ions in the ionic equation. ##PbI_2## would not form ions in the ionic equation. The ionic equation for the example above is ##Pb^(2+)(aq) + 2I^()(aq) ...
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