Homework answers and tutorials

Waiting for answer Write a balanced ionic equation to represent the reaction be...
Start by assigning to all the atoms that take part in the reaction. ##stackrel(color(blue)(+4))(S) stackrel(color(blue)(2))(O_2) + stackrel(color(blue)(+6))(Cr_2) stackrel(color(blue)(2))(O_7^(2))  stackrel(color(blue)(+6))(S) stackrel(color(blue)(2))(O_4^(2)) + stackrel(color(blue)(+3))(Cr...
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Waiting for answer Why do electric lines of force never cross?
The short answer is if they did cross, they would represent a location with two different strong electric field vectors, something that can't exist in nature. Lines of force represent the strength of at any given point. Visually the denser we draw the lines, the stronger the field is. Electric fi...
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Waiting for answer What do the prefix nimbo and the suffix nimbus mean?
"Nimbus", Latin for "dark cloud", refers to clouds that produce precipitation. The clouds are not really dark. Rather, precipitation is associated with a heavy accumulation of cloud...
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Waiting for answer How will u justify a lone pair on carbon in CO ?
By formal charge separation.......... A typical Lewis structure used for the carbon monoxide molecule is ##""^():C=O^(+)##. Of course this is a formalism, that is it is a way to v...
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Waiting for answer An atom of polonium218 undergoes alpha decay. What new ele...
Lead. is the loss of two protons and two neutrons from a nucleus. This decreases the total by ##4## and the by ##2##. In the form of an equation this is ##""_ 84^218"Po" ""_...
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Waiting for answer Enter the measure of an exterior angle of a regular pentagon...
A regular pentagon has an exterior angle of ##72^0## A Pentagon has ##n=5## sides. The sum of the exterior angles of any polygon is always 360° A regular pentagon has an exterio...
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Waiting for answer What is the taxonomic classification for malaria?
Plamodium sp. Following is the taxanomic classification of malaria. four different are known to cause malaria. out of which the most deadliest (causes largest number of fatality)...
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Waiting for answer Which way does the moon and earth rotate around the sun?
Earth rotates itself in anti clock wise direction if you look from north pole. For us it is from west to Ea.st. Moon also rotate itself in the same anti clock wise direction if you...
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Waiting for answer How do I use the vertex formula to determine the vertex of t...
In vertex form the equation looks like ##y+2=1/8(x+3)^2## So the vertex is the point ##(3,2)## This has always been kinda confusing for me since no one explained to me so I le...
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Waiting for answer How can I calculate the bond order of benzene?
You draw the molecular orbitals. Then you add electrons and count the number of and antibonding electrons. The bond order of a bond is half the difference between the number of bonding and antibonding electrons. BO = ½(B – A) The CC σ Bonds Each CC σ bond is a localized bond. It has 2 bondin...
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Waiting for answer What is a gene pool?
The set of genes in an interbreeding population. The pool includes all of the genes or genetic material in a . This includes genes that are expressed and those that are not. We can...
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Waiting for answer How does metallic bonding contribute to a metals malleabili...
Remember the definition of malleability : capable of being hammered out (cf. malleus , Latin for hammer!). The property of malleability derives from the nonlocalized , " positive...
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Waiting for answer Why do haloalkanes undergo nucleophilic substitution?
Haloalkanes undergo nucleophilic substitution because their electronegativity puts a partial positive charge on the α carbon atom. All the halogens except iodine are more electronegative than carbon. Iodine has the same electronegativity as carbon. That means that every carbonhalogen bond (excep...
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Waiting for answer What is the focus of the parabola ##(x – 1)^2 + 32 = 8y##?
##(1,6)## First, get the equation of the parabola into vertex form: ##y=a(xh)^2+k## To do this, multiply the entire equation by ##1/8##. ##1/8((x1)^2+32)=1/8(8y)## This sim...
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Waiting for answer What is Thermal Equilibrium?
Thermal equilibrium is when two objects are at the same temperature. Two objects at different temperatures will reach thermal equilibrium because heat will flow from high temperature to low temperature. For example a hot cup of coffee and a room. This does not mean that they contain the same amou...
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Waiting for answer What is the Lewis structure of NO2?
See explanation. There are originally 5 electrons in nitrogen but now 6 due to the addition electron from the ion. On one side nitrogen forms a double covalent bond with oxygen,...
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Waiting for answer How do you find the zeros of the function ##f(x)= x^22x4#...
The zeros of this function are ##x_1=1sqrt(5)## and ##x_2=1+sqrt(5)## To find the zeros of a quadratic function you first have to calculate ##Delta##. In this case it is ##Delta = (2)^24*1*(4) = 20## ##Delta 0 ## so function has 2 real zeros which can be calculated using: ##x_1=(bsqrt(Delt...
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Waiting for answer How do you convert gallons into cubic meters?
1 U.S. gallon = 3.79 L 1 L occupies a space of ##1 dm^3## (##1 dm^3## measures 10 cm, or approximately 4 in, on each side of the cube.) It takes 1 000 ##dm^3## to make up ##1 m^3## (Each side of the cube measures 10 dm.) Therefore: 1 gal (U.S.) = 3.79 x ##10^3 m^3## If you are wanting to conve...
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Waiting for answer What is meant by the FirstPass Effect of drugs?
After oral administration, many drugs (morphine, pentazocine) are absorbed intact from the small intestine and trasported first via the portal system to the liver, where they undergo extensive metabolism. This process is called the firstpass effect....
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Waiting for answer What are the differences between the income approach and exp...
The basic difference between the two is in terms of the components included in the measurement of GDP. The EXPENDITURE APPROACH includes the expenditures incurred by various economic agents involved in production and consumption. Recalling the fundamental national income identity : Y = C + I + G...
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