Homework answers and tutorials

Waiting for answer What is a placebo?
A placebo is really just a medical that seems to be realbut isn't. It could be a shot or a pill or you can say "fake treatment".
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Waiting for answer What vsepr shapes are polar?
There is an excellent handout on shapes that also tells you which ones are polar. Rather than write a lengthy essay here, I will just point you to the site:http://www.angelo.edu/faculty/kboudrea/index/Handout_Lewis_VSEPR.pdf
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Waiting for answer Which one gives an acidic pH in aqueous solution ? 1 NaCl...
To determine, you look at the strength of the underlying acid and base. The stronger one defines the pH of the salt. ##NaCl## strong acid (##HCl##) and strong base (##NaOH##) Result: neutral ##NaHCO_3## weak acid (##H_2CO_3##) strong base (##NaOH##), but with extra (acidic) ##H##. Result slightly...
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Waiting for answer How was the parsec derived?
"Parsec" is a portmanteau of the words "Parallax" and "arcsecond"; an object one parsec distant has a par allax of one arc sec ond The definition for a parsec being ~3.26 lightyea...
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Waiting for answer What is CRISPR gene?
you mean CRISPR/cas9 system CRISPR/cas9 is defense system found in , consists of a protein called cas9 and the CRISPR locus CRISPR locus crispr means clustered regular interspace...
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Waiting for answer How does the egg cell and the sperm cell fuse together to fo...
Egg cell contains various membranes: the important ones are : PRIMARY EGG MEMBRANES Vitelline membrane Zona Pellucida Zona Radiata SECONDARY EGG MEMBRANES Corona Radiata Chorion Sperm cell also contain various zones, those which is responsible for fertilisat...
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Waiting for answer How do you rationalize the denominator and simplify ##sqrt35...
You can rationalize a radical denominator by multiplying the radical by itself. e.g. ##sqrt8## x ##sqrt8## = 8 ##sqrt3## x ##sqrt3## = 3 ##sqrt5##x##sqrt5##=5 However, by multiplying the radical denominator by a number, you have to do the same for the numerator. ##sqrt35/sqrt55## x ##sqrt55/sqr...
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Waiting for answer How do you calculate buffer pH for polyprotic acids?
All buffer consist of a mixture of an acid with its conjugate base. Calculate using the HendersonHasselbalch equation, which requires the Ka of the acid and the relative concentrations of acid and base. This works for polyprotic acids, too. Example: For a mixture of sodium carbonate and sodiu...
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Waiting for answer What were traditional views that led people to disapprove of...
Women were seen as "the weaker sex." Women were viewed as being too frail and too emotional to handle thinking about serious topics. Politics and business were considered the domain...
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Waiting for answer Why is acceleration measured in meters / seconds squared?
is calculated by dividing change in velocity by time. Since velocity can be measured in m/s and time can be measured in s the unit is meter/sec/sec or meters/##s^(2)##. Let's say you speed up from 10 m/s to 25 m/s and it takes you 5 seconds to do that. Acceleration is (##v_f##  ##v_i##)/time....
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Waiting for answer How do you prove ##cosh(2x) = cosh²x + sinh²x##?
see below Use formula: ##cosh x=(e^x+e^x)/2 and sinh x = (e^xe^x)/2## Right side:##=cosh^2x+sinh^2x## ##=((e^x+e^x)/2)^2 +((e^xe^x)/2)^2## ##=(e^(2x)+2+e^(2x))/4 + (e^...
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Waiting for answer I don't understand the concept of hydrates; A 2.78g sample o...
The concept is very simple. Hydrates are that contain a certain amount of water. When you heat a hydrate, all the water that's a part of its structure is evaporated, leaving behind the anhydrous salt . In your case, the hydrated form of iron (II) sulfate weighs 2.78 g . After all the water of hy...
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Waiting for answer What is the relationship between the second law of thermodyn...
Entropy means, roughly, "disorder." The second law says that, in an "isolated system" (that is, in any group of objects that does not have any added to it or any done on it), total entropy increases over time. Your room is a system, with lots of objects. Over time, your room tends to get messy (di...
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Waiting for answer What is the maximum number of pi bonds that can exist in a g...
The maximum number of pi bonds that can exist in a given pair of atoms is 4. The maximum number of that can exist in a given pair of atoms is 4. When nobles gases are making a bond,...
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Waiting for answer Does ##54/8## have an equivalent fraction with a denominator...
It does not have an equivalent version (with a denominator of 9) and an integer numerator. Occasionally you may find a teacher looking for (or accepting) fractions with numerators (...
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Waiting for answer How do you find the rate of change of y with respect to x?
The rate of change of y with respect to x, if one has the original function, can be found by taking the derivative of that function. This will measure the rate of change at a specific point. However, if one wishes to find the average rate of change over an interval, one must find the slope of the se...
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Waiting for answer What is the empirical formula for the compound P4O6?
A molecular formula is one in which all of the atoms in the compound are listed. For example, if I have the molecular formula ##C_2H_6##, I know that there are two carbon atoms and six hydrogen atoms in the molecule. An empirical formula is one in which the ratios of the atoms of each element are...
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Waiting for answer 39 is 5% of what number?
##39## is ##5%## of ##780## To get from ##5%## to ##100%## we multiply by ##20## ##5%xx20=100%## We use the same number we used with ##5% (20)## and multiply 39 with it ##39xx20=7...
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Waiting for answer What year was Abraham Lincoln elected president?
The split in the Democratic Party insured Lincoln's election. Lincoln won the election of 1860 despite getting less than 40 % of the popular vote. But he gained enough electoral vote...
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