Homework answers and tutorials

Waiting for answer How is the human respiratory system related to the circulato...
The gives us oxygen while the distributes it. Well, if you are familiar with the circulation of the blood, you can see that the blood goes to the heart, into the lungs, back to the...
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Waiting for answer How did Henry Moseley alter Mendeleev's original periodic ta...
Henry showed that is more fundamental property than it's . Therefore Mendeleeve's law was modified as: The physical and chemical properties of an element are the functions of their atomic numbers. the periodic law revealed important analogies among the 94 naturally occurring . It stimulated rene...
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Waiting for answer What is the structural formula for 2methylpropane?
##2"methylpropane"##? ##H_3CCH(CH_3)CH_3##. The longest chain is 3 carbons long; a methyl group substitutes the chain at ##C2##.
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Waiting for answer What is the empirical formula of methane given methane can b...
##"CH"_4## Your goal when trying to figure out a compound's empirical formula is to find the smallest whole number ratio that exists between its constituent . The problem tells y...
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Waiting for answer What is the answer to: 50g of nitrogen (N2) has a volume of...
By converting to moles then to litres, we get 40L Recall that the of an element corresponds to its molar mass in grams. For nitrogen (14 AMU), 1 mole = 14g. Now since it's the nitr...
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Waiting for answer How do you prove ##sin^2x/ (cos^2 +3cosx+2) = (1cosx)/ (2+c...
See proof in explanation. ##(sin^2 x)/(cos^2 x + 3cosx + 2) =(1cosx)/(2+cos x) ## Start with the left hand side: ##(1cos^2 x)/((cos x+1)(cos x + 2)) ## ##implies ((1cos x)(1+c...
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Waiting for answer Why is the pH scale 014?
Actually, the scale is not limited to 014, but most common fall into this range. The pH of a solution is calculated as the negative base10 logarithm of the hydronium ion (##H_3O^+##) concentration in solution. Example 1: A 0.01 M solution of HCl (a strong acid that completely dissociates to ##...
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Waiting for answer How does the valence electron configuration work for sulfur?
Sulfur is located in the 3rd energy level (row) and Group VIA (16th column) of . This is the 4th column of the p block,meaning Sulfur must end in a configuration of ##3p^4##. The for sulfur is ##1s^2 2s^2p^6 3s^2 3p^4## This means that sodium has a valence shell of ##[Ne] 3s^2 3p^4##. The val...
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Waiting for answer Which is more effective at raising the boiling point of a so...
##"Calcium nitride"##, mind you I would not want to eat the soup afterwards. Boiling point elevation is proportional to the number of species in solution; it is a colligative propert...
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Waiting for answer What is the basic structure of an atom?
An atom contains subatomic particles called protons, neutrons, and electrons. The basic structure of an atom includes a tiny, relatively massive nucleus, containing at least one pro...
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Waiting for answer How do you prove ##1/(sinxcosx)  cosx/sinx = tanx##?
##1/(sinxcosx)cosx/sinx=tanx## ##1/(sinxcosx)cosx/sinx(cosx/cosx)=tanx## ##1/(sinxcosx)cos^2x/(sinxcosx)=tanx## ##(1cos^2x)/(sinxcosx)=tanx## ##sin^2x/(sinxcosx)=tanx## ##sinx/cosx=tanx## ##tanx=tanx##
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Waiting for answer Pure water freezes at 0°C and boils at 100°C. Would tap wate...
No it wouldn't When a solvent (like water) has a solute(like natural and added minerals) dissolved in it, it can undergoe a boiling point elevation or a freezing point depression
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Waiting for answer What is the ordered pairs that satisfy the equation y=1/5x?
Two ordered pairs are ##(0,0)## and ##(5,1)##. ##y=1/5x## Simplify. ##y=x/5## This equation is in the of a linear equation ##y=mx+b##. Determine two points and plot them. Then d...
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Waiting for answer 4HCl(aq) + MnO2(s) →2H2O(l) + MnCl2(aq) + Cl2(g) How many gr...
8.39 grams ##HCl## will react with 5.00 grams of ##MnO_2## ##4HCl + MnO_2  2H_2O + MnCl_2 + Cl_2## For this reaction determine the mass of HCl that will react with 5.00 grams o...
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Waiting for answer According to the nebular theory, how did the Oort cloud form...
Please check the explanation ... As the solar nebula collapsed gravitationally its core region becomes dense and denser gets heated and its temperature and pressure increase with tim...
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Waiting for answer What is the square root of a googol?
##10^50##, or 100 quindecillion Since a googol is 1 with a hundred after it, the square root should be 1 with 50 zeros after it.
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Waiting for answer How convection currents form in earth's interior?
Convection Currents are a type of heat transfer created when the density of the molecules in a liquid layer of the earth change due to temperature. Convection Currents are known as...
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Waiting for answer What is the formula for Ammonium sulfide?
(NH4)2SO3 NH4 ^+ + SO3 ^2 ) (NH4)2SO3
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Waiting for answer Draw the lewis dot structure of H2SO4 show formal charges?...
Both sulfuric and nitric acids are NEUTRAL species. Lewis dot formulae should (and do) reflect this neutrality. Typically, we would display the sulfur in sulfuric acid as a neutral...
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