Homework answers and tutorials

Waiting for answer Zinc phosphide, ##Zn_3P_2##, is often used as a rat poison....
The phosphide anion is formally ##P^(3)##.......... And the zinc cation is ##Zn^(2+)##. When the ions form a salt, clearly they form an electrically neutral species; and thus the f...
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Waiting for answer Isaac made 1 quart and 2 ounces of vegetable dip and poured...
##7ounces## ##1 quart=32 US fluid ounces + 2 ounces=34ounces## Isaac made 34 ounces of dip. 1 US cup = 8 ounces 3 US cups##=(3 xx 8)+3 ounces=27ounces## ##:.3427=7ounces #...
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Waiting for answer What is animism?
Animism is essentially a part of the belief in some religions; more specifically that there is a soul within the body of everything around us. Indians and Christians are a prime exam...
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Waiting for answer How doyou find the derivative of ##2sinxcosx##?
##2sinxcosx=sin2x## using the , the derivative is ##2cos2x## Here is how, ##d/dx(sinx)=cosx## The chain rule for this case is ##d/dx(sinf(x))=f'(x)*cosf(x)## Thus ##d/dx(sin2x)=2cos2x##
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Waiting for answer What is the percent concentration of sodium chloride in norm...
Normal saline that is used in medicine has a concentration of 0.90% w/v of ##"Na"##Cl in water. It is prepared by dissolving 9.0 g (154 mmol) of sodium chloride in water to a total...
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Waiting for answer How do microorganisms affect humus and thereby soil health?
Microorganisms decompose organic matters Microorganisms like bacteria, fungi decompose organic matters. Plants are decomposed to give off eesntial nutrients which can later be used a...
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Waiting for answer How does dilation affect the length of line segments?
Dilation of segment ##AB## is a segment ##A'B'##, where ##A'## is an image of point ##A## and ##B'## is an image of point ##B##. The length is transformed as ##A'B' = f*AB##, where ##f## is a factor of dilation...
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Waiting for answer How do you calculate the mechanical energy of an object?
Use one of the 4 equations for mechanical energy. There are 4 main types of mechanical : Potential energy due to gravity Kinetic energy Rotational kinetic energy Potential energy...
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Waiting for answer If ##csc theta=4/3##, what is the sin, cos, tan, sec, and co...
If ##csctheta=4/3## then ##sintheta =3/4## also ##sintheta=a/c##, therefore, ##a=3, c=4## using Pythagorean theorem ##b=sqrt7.## ##costheta = b/c=sqrt7/4## ##tantheta=3/sqrt7=(3sqrt7)/7## ##sectheta=c/b=4/sqrt7=(4sqrt7)/7## ##cottheta= b/a = sqrt7/3##
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Waiting for answer How do you use the leading coefficient test to determine the...
If the leading coefficient is negative, the polynomial function will eventually decrease to negative infinity; if the leading coefficient is positive, the polynomial function will eventually increase to positive infinity. This answer assumes by leading coefficient you mean the coefficient of the hi...
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Waiting for answer How does the law of diminishing marginal returns affect outp...
By increasing marginal costs higher than it would have been without the fixed factor being fixed. The law of diminishing returns or in a broader way, the law of variable proportions, says that with one factor fixed, you to produce increase the output by one unit, the marginal unit, must increase th...
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Waiting for answer How do you find the central angle of a pie chart for a secti...
Each pie chart has 360°, since it is represented by a complete circle. If you are looking for 20% of that circle, you will use 20% of its 360 degrees as well. ##20/100 *360° = 72°## Or: You can say: ##100% hArr 360^0## so every ##1% hArr3.6^0## and work from there.
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Waiting for answer What is the equation for Snell's law?
where ##n_1## is the index of refraction of the first substance that light travels through ##theta_1## is the angle of incidence ##n_2## is the index of refraction of the second substance that light travels through ##theta_2## is the angle of refraction Then you need to isolate your unknown. Exa...
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Waiting for answer How much heat, in joules and in calories, must be removed fr...
You would need to remove ##"1300 Joules"##, or ##"320 cal"##, worth of heat from that much water to get its temperature to drop by ##"10"^@"C"##. First, start by listing the of water in both calories per gram Celsius, and in Joules per gram Celsius. ##c_("water") = "1.00""cal"/("g" * ^@"C") =...
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Waiting for answer What is the equation for the line of reflection that maps th...
##y = 1## It is an isosceles trapezoid, which is just as well, otherwise it could not reflect onto itself. The line of reflection is the same as the mirror line which is the same as...
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Waiting for answer What is the contour interval and why is it important?
Since topographic contours represent points of equal elevation, the contour elevation tells you the elevation difference between two adjacent contours. Generally, contour intervals are in units that allow you to see the elevation differences. Larger contour intervals are typically used in regions w...
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Waiting for answer What does "awkward syntax" mean? My English teacher wrote th...
Awkward syntax means your sentence is structured weirdly. Rearrange it so it flows smoothly and naturally. Syntax is the structure of a sentence. It is also an area of linguistics (...
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Waiting for answer According to Avogadro's law, why dies the ideal gas constant...
assumes that all gases are ideal. Ideal gases have the following properties: They experience no intermolecular forces. They experience totally elastic collisions. They are infinitely small. Their kinetic energy is directly proportional to the temperature in Kelvin. In other words, all ideal...
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Waiting for answer What is latent heat of fusion?
The of fusion is the amount of thermal (see note below) required to cause a a liquid to freeze (by taking that much heat out) or a solid to melt (by putting that much heat in). For example, the latent heat of fusion for water (ice) is about 334 kJ/mol. Find the amount of heat required to melt 36....
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Waiting for answer A rectangular room is 6 meters longer than it is wide, and i...
5m x 11m take the width of the room as ##x##, then the length of the room becomes ##x+6## according to the data. i can take these data and write an equation as follows which shows...
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