Homework answers and tutorials

Waiting for answer Draw Lewis structure ,state the molecular geometry and state...
They are below. ##H_2CO## ##PCl_3## ##NO_2^##
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Waiting for answer How do covalent compounds differ from ionic compounds?
Ionic bonds are created by electrochemical attraction between atoms of opposite charges, while molecular bonds (aka covalent bonds) are created by atoms sharing electrons in order to complete the rule of octet. An ionic compound is created through the electrochemical attraction between a positively...
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Waiting for answer What is an exponent and exponential notation?
Exponential notation is a way of shorthand for very large numbers and very small numbers. But first exponents. They are the numbers that you see at the top right of another number, called the base, as in ##10^2##, where the 10 is the base and the 2 is the exponent. The exponent tells you how many...
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Waiting for answer What is protoplasm in biology?
Protoplasm is the colourless liquid within a cell that comprises the cytoplasm, nucleus and organelles. A cell is made up of a cell wall that contains protoplasm. The protoplasm is...
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Waiting for answer A rectangle is inscribed in an equilateral triangle so that...
##A = (25sqrt(3))/2## First, let's look at a picture. Some initial observations: The area ##A## of the rectangle is ##A=bh##. By symmetry, the base of the triangle is of leng...
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Waiting for answer What is difference between (1) Anion & Anode (2) Cation...
Anion is a negative ion like you can probably name so many examples. ##Cl^()## ##CO_3^(2)## Anode however is the POSITIVE electrode used in electrolytic cells for instance, or in electrophoresis. Why the two seem related (and the nascent confusion I used to have too) is that the ANODE attracts...
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Waiting for answer What is the greatest common factor of ##20x^4## and ##6x^3##...
When we want the GCF, we want the greatest number that can be divided between the number. For ##20x^4## and ##6x^3##, we know that ##x^3## is a common factor. For ##20## and ##6##, it would be 2. So the answer would be ##2x^3##.
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Waiting for answer How do you determine the concavity of a quadratic function?
For a quadratic function ##f(x)=ax^2+bx+c##, if ##a 0##, then ##f## is concave upward everywhere, if ##a 0##, then ##f## is concave downward everywhere.
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Waiting for answer What units of measurement are used for the combined gas law?
For pressure, any unit can be used. Though it's most common to see kilopascals (kPa) or atmospheres (atm), there's no reason you couldn't use bar, torr, or psi. For volume, again, any unit can be used. Because we scientists are fond of the metric system, we prefer metric units like milliliters (m...
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Waiting for answer Given the right trapezoid calculate angle ##theta## and the...
##/_theta = arctan((sqrt(3)1)/2)~~0.350879411 rad## ##S_(EAD) = 2## From right triangle ##Delta ABE##, knowing hypotenuse ##AE=4## and cathetus ##AB=2## we can find another cathetu...
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Waiting for answer How do you convert 45°C to Fahrenheit?
Recall the formula to convert this. ##\mathbf(T_C = 5/9(T_F  32))## Of course, ##T_C## is the temperature in ##""^@ "C"##, and ##T_F## is the temperature in ##""^@ "F"##. Let's test this to make sure. I know that ##100^@ "C" = 212^@ "F"## is the boiling point of water, so let's see if that wor...
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Waiting for answer How many moons does Saturn have? Which is the largest?
62 known moons. Titan is the largest. There are 62 known satellites of the planet Saturn, the largest being Titan . Titan is the second largest moon in the solar system, surpassed...
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Waiting for answer What is the difference between aryl and alkyl phenyl?
I'm assuming you mean "alkyl phenyl" vs. "aryl", rather than "aryl phenyl" vs. "alkyl phenyl", because "aryl phenyl" seems redundant. I interpret "alkyl phenyl" as the one on the left here: An example of an alkyl phenyl you might see often in class is a benzyl group, like in benzyl bromide (brom...
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Waiting for answer Two complementary angles have measures of ##2x+5°## and ##3...
##43^@" and " 47^@## Complementary angles are ##color(blue)"2 angles whose sum is 90 degrees"## Hence ##2x + 5## and ##3x  10## , sum to ##90##. ##rArr2x+5+3x10=90larr" equation...
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Waiting for answer What is ionization; in relation to acids?
Consider the ionization of hydrochloric acid: ##HCl(aq) + H_2O(l) rightleftharpoons H_3O^(+) + Cl^## The charge separation that the acid undergoes upon protonolysis, i.e. its donat...
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Waiting for answer What is the derivative of ##y=sec^2(2x)##?
The function ##y = sec^2(2x)## can be rewritten as ##y = sec(2x)^2## or ##y = g(x)^2## which should clue us in as a good candidate for the power rule. The power rule: ##dy/dx = n* g(x)^(n1) * d/dx(g(x))## where ##g(x) = sec(2x)## and ##n=2## in our example. Plugging these values into the power...
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Waiting for answer A 50.0 mL sample of phosphoric acid, H3PO4, is titrated with...
##0.066"mol/l"## ##H_3PO_(4(aq))+3NaOH_((aq))rarrNa_3PO_(4(aq))+3H_2O_((l))## No. moles ##NaOH=cxxv=0.250xx0.0425=0.01## From the equation we can see that the no. moles of phosphor...
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Waiting for answer In the sentence, "I'm cleaning my room," Cleaning is the ver...
"I" because it is "I" that is cleaning. In this question, we have: "I'm cleaning my room" I'll now substitute in the parts of speech for each word: "Subject, Verb, Posessive Adjec...
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Waiting for answer How do you calculate formal charge from an equation?
The formal charge of any atom in a molecule can be calculated by the following equation: ##FC = V  N  B/2## where V is the number of of the neutral atom in isolation (in its ground state); N is the number of non on this atom in the molecule; and B is the total number of electrons shared...
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Waiting for answer In racemic mixture, why are both enantiomers of compound pre...
Because that is what we mean by ##"racemate"##. By definition, a racemic mixture, a racemate, contains equal quantities of left handed and right handed . Stereoselective syntheses a...
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