Homework answers and tutorials

Waiting for answer What is the difference between expansionary and contractiona...
Expansionary monetary policy is used by the central bank of a country to increase the supply of money in the economy and boost economic activities. Contractionary monetary policy on the other is used to curb spending in the economy by reducing the supply of money
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Waiting for answer According to Hamilton, what are implied powers?
Implied powers are powers not directly stated in the Constitution, but are assumed to exist because they are necessary. An example of an implied power might include the existence of...
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Waiting for answer What are metalloids?
are that behave as metals as well as nonmetals. In some elements, especially the lower members of groups 14 to 17, have properties of both metals and nonmetals. They are called semimetals or metalloids. Examples are silicon, germanium, arsenic, antimony, tellurium, and polonium. Chemicall...
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Waiting for answer The volume of a rectangular prism is represented by the expr...
Width of the prism is ##4## units. As the volume of a rectangular prism, whose length is ##l##, height is ##h## and width is ##w## is ##lxxhxxw##. As the volume of rectangular prism...
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Waiting for answer How does the half life of a nuclide relate to the stability...
A long halflife indicates higher stability and vice versa. Halflife is a measure of how long it takes for one half of the atoms of a nuclide to undergo radioactive decay. A short...
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Waiting for answer How do the Ka values for weak and strong acids compare?
The greater the ##K_a## value for an acid is relative to the strength of the acid, or the magnitude at which it will disassociate in water. The closer the ##K_a## value is to one the stronger it is (the term "strong acid" means that it completely disassociates). If you can remember the 6 strong a...
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Waiting for answer How do you calculate ##Arctan(  sqrt 3/3)##?
##arctan(sqrt(3)/3) = tan^1(sqrt(3)/3) = tanx = sqrt(3)/3## So basically what the problem asking you is that what angle on unit circle will give us ##sqrt(3)/3## for tangent function. You need to know the unit circle in order to find this the easy way, ##tan((pi)/6)## will give you ##sqrt(3)/...
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Waiting for answer How did Rutherford's gold foil experiment disprove the plum...
Rutherford's experiment showed that the atom does not contain a uniform distribution of charge. Thomson's plum pudding model viewed the atom as a massive blob of positive charge dot...
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Waiting for answer What is 4pi in degrees?
##pi## is 180 degrees. So, 4 times ##pi## would be 4*180= 720 degrees. There are ##2pi## radians in a circle. And we know that the entire circle is 360 degrees. That would mean ##p...
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Waiting for answer How are the Pythagorean Theorem and the Distance Formula rel...
If we consider what the distance formula really tells you, we can see the similarities. It is more than just a similar form. The distance formula is commonly seen as: ##D = sqrt((x_1  x_2)^2 + (y_1  y_2)^2)## We commonly write the as: ##c = sqrt(a^2 + b^2)## Consider the following major...
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Waiting for answer How do you prove that ##(1/2)(ln2  ln4 + ln3) = (1/2)ln(3/2...
In the bracket with ##(ln2ln4+ln3)## you can apply the following general rules of the logarithms: 1) ##lna+lnb=ln(a*b)## 2) ##lnalnb=ln(a/b)## and you should be able to get your result.
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Waiting for answer Among red and violet color which has higher speed?
All the transverse electromagnetic waves in vacuum have the same speed of ##~~3 * 10^(8) "m/s"##. It's the frequency and wavelength that differs. Red light has a lower frequency (longer wavelength), while violet light has a higher frequency (shorter wavelength). In other media the speed differs...
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Waiting for answer Based on Saytzeff's rule, select the most stable alkene: 1m...
The most stable alkene is 1methylcyclohexene. The structures of the three compounds are The most stable alkene is the one that is the most highly substituted. Structure 1 is tri...
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Waiting for answer Why does electronegativity increase as atomic radius decreas...
When atomic radius decreases, electrons are closer to the nucleus, which means that the attraction that atom has on the orbiting electrons increases, and therefore the electronegativity increases....
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Waiting for answer What is the difference between primary, secondary and tertia...
The alcohol contains functional group OH. You have to check for the hydroxy carbon i.e. the carbon to which this OH is bonded to. If the hydroxy carbon is bonded to only one carbon, then it is called as primary alcohol. Eg. ##CH_3CH_2OH## If the hydroxy carbon is bonded to two carbons, then it...
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Waiting for answer What is a contraction?
A words or group of words resulting from combining or eliding an earlier form. A contraction is a words or group of words resulting from combining or eliding an earlier form. Some e...
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Waiting for answer What is ##abs(9)##?
##abs(9) = 9## If ##x 0## then ##abs(x) = x 0## If ##x = 0## then ##abs(x) = 0## If ##x 0## then ##abs(x) = x 0## For all ##x## we have ##abs(x) = 0## ##abs(x)## is th...
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Waiting for answer How do you simplify the expression using a double angle form...
Remember that ##cos2theta=12sin^2theta##. Hence ##12sin^2(2x)=cos4x##
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Waiting for answer How many cheese doodles are in .5 moles of cheese doodles?
A lot! ##3.01 xx 10^23## 1 mole of anything contains ##6.02 xx 10^23## parts of that anything, so half mole of doodles will be ##3.01 xx 10^23## of those doodles.
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Waiting for answer What causes boiling point elevation and freezing point depre...
Presence of particles in the solution. Boiling point elevation and freezing point depression are affected by the presence of solute particles with the . Note that the increase in...
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