Homework answers and tutorials

Waiting for answer What is abstract reasoning?
abstract reasoning is the ability that defines formal operational stage in piaget's theory of development abstract reasoning, in the simplest terms, is the ability to reason or predi...
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Waiting for answer How was Le Chatelier's principle used to determine the extin...
There is only one Le Châtelier's Principle, whereas there are many extinction coefficients, as many existing coloured substances have their own extinction coefficient and can be involved in several equilibrium reactions. There are general experimental and mathematical approaches to the general prob...
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Waiting for answer What is the Hess' law?
According to the Hess's Law of constant heat summation, the total amount of heat evolved or absorbed in a reaction is same whether reaction takes place in one step or multiple steps....
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Waiting for answer How does the law of diminishing returns affect a firm's cost...
In economics, diminishing returns refers to production in the short run (also called diminishing marginal returns) is the decrease in the marginal output of a production process as the amount of a single factor of production is increased, while the amounts of all other factors of production stay con...
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Waiting for answer What is the square root of 63 in simplest radical form?
##3sqrt7## ##sqrt63## ##sqrt(9*7)## ##sqrt(3*3*7)## ##3sqrt7##
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Waiting for answer What is the Asthenosphere?
##color(darkorange)"The asthenosphere"## is a layer (zone) of Earth’s mantle lying beneath the lithosphere. It is a layer of solid rock that has so much pressure and heat the rocks can flow like a liquid. The rocks are also less dense than the rocks in the lithosphere It is believed to be...
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Waiting for answer A certain beverage contains 7.700% ethanol ##(C_2H_6O)## by...
##"1909 mL"## Your strategy here will be to use ethanol's molar mass to determine how many grams would contain the given number of moles use the given to find the volume of...
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Waiting for answer Calculate [H3O+] for this solution: pH = 8.85? Can you plea...
This is a fairly straightforward problem, all you need to know is that ##[H_3^+O] = 10^(pH)## Plugging in the value will produce ##[H_3^+O] = 10^(8.85) = 0.00000000141 = 1.4 * 10^(9) M## SInce the pH is greater than 7, you are dealing with a basic solution ##pOH = 14  pH = 148.85 = 5.15#...
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Waiting for answer What is an eclipse compared to occultation?
An eclipse is an occultation. An occultation is when three bodies align so that the middle one passes over the most distant one from the perspective of an observer on the third body....
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Waiting for answer Which kind of exocrine gland has no cytoplasm in its secreti...
Merocrine (eccrine) glands. Exocrine glands are glands that excrete their products onto an epithelial surface. This in contrast to endocrine glands that secrete products into the bl...
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Waiting for answer What is the perimeter of a rectangle with sides 2/9 m and 5/...
Perimeter of rectangle is ##2 1/9## ##m##. Perimeter of a rectangle whose two sides are ##l## and ##b## is ##2xx(l+b)## In the given case ##l=2/9## m and ##b=5/6## m. Hence perime...
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Waiting for answer What does it mean to say that two variables are directly pro...
It means when the two variables are demonstrated graphically on a graph, they both will form a straight linear line, diagonally. When variable A increase, variable B will also increase and vice versa. The opposite of direct proportional is inverse proportional which means when variable A increase,...
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Waiting for answer What are all the prime factors of 144?
From the factor tree observe that the prime factors of 144 are ##2^4xx3^3## If you are ever not sure about the prime factors do a quick sketch of a factor tree:
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Waiting for answer In an exergonic reaction, what is the ##DeltaG##?
##DeltaG## is negative, which means that the reaction is spontaneous in the forward direction. As the chemical reaction proceeds, the reactants are being converted into products. T...
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Waiting for answer What are two major shortcomings of the Bohr model of the ato...
See explanation. Bohr model was based on several assumptions, some of them were correct but some others were wrong. The first wrong assumption made by Bohr is considering the electr...
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Waiting for answer What is the corect product when 2Nacl + 2H2O = NaOH + H2 +...
In fact neither is correct. Sodium chloride does not hydrolyze water. When NaCl is dissolved in water, ionization occurs to form aquated ##Na^+##, and ##Cl^## ions. We could repre...
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Waiting for answer How is a concentration gradient related to the process of di...
Molecules diffuse from areas of high concentration, to areas of low concentration, down a concentration gradient. The concentration gradient therefore represents the concept that, just as a ball rolls down a slope, during molecules move down the concentration gradient. Higher concentration gradie...
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Waiting for answer Balance the following reaction: CaCO3 + FePO4 > Ca3(PO...
For this question we have to start with balanced chemical equation. ##3CaCO_3##+ ##2FePO_4##  ##Ca_3(PO_4)2## + ##Fe_2(CO_3)3## (a) As per the above equation (a) Three moles of ##CaCO_3## , consumes two moles of ##FePO_4##. In terms of mass one mole of ##CaCO_3## , has mass 100 g/mol. an...
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Waiting for answer What causes wind?
Air pressure gradient. Wind is the movement of air. is cause by a pressure gradient. Air will move from an area of high pressure toward an area of low pressure. There are other e...
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Waiting for answer If ##A = <3 ,1 ,3 >##, ##B = <2 ,3 ,5 >...
##112.47^0## C= AB= 3,1,3  2, 3, 5 = 1,2,2 Angle between A and C would be given by ##cos theta=(A*C)/(A C)## ##cos theta = (3*1 +(1)*2 + 3(2))/ (sqrt(3^2 +(1)^2 +...
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