Homework answers and tutorials

Waiting for answer What are some common mistakes students make when naming ioni...
Mostly students want to name as if they were , using prefixes in place of the subscripts. In other words, ##Al_2O_3## is incorrectly named dialuminum trioxide, or aluminum trioxide instead of of the correct ionic compound name of Aluminum oxide. The charges on the aluminum cation and the oxide an...
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Waiting for answer What is a supernova? What do supernovas produce?
A supernova is a big explosion when a star explodes. A supernova blasts away heavy elements (silicon, oxygen, nitrogen, iron, lithium etc.) produced in the star, for hundreds of ligh...
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Waiting for answer In a moving coil galvanometer, why concave head pole pieces...
Beacause it produces radial magnetic filed which is parallel to the plane of the coil giving strong and uniform magnetic field.
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Waiting for answer What is the area formula for a half circle?
##(pir^2)/2## The typical area for a circle is: ##color(white)(sss)A=pir^2## Divide both sides by ##2##, or multiply both by ##1/2##, to find the formula for half the area: ##colo...
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Waiting for answer What is a uniform density curve?
The density curve for a probability distribution is its graphical representation. The area under a density curve is always equal to 1. The Uniform distribution has equal probabilities for all possible values in its range, so the Uniform density curve is just a horizontal line, running from the lowe...
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Waiting for answer What is oxidation?
Oxidation is generally defined in two ways: organic oxidation by addition of oxygen or removal of hydrogen inorganic oxidation by the removal of electrons, thereby increasing the oxidation state (i.e. making it more positive) by ##1## for each electron (##e^()##). For example... ORGANIC OXID...
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Waiting for answer If a quadrilateral is both a rectangle and a rhombus, then i...
A rectangle is a plane figure bounded by four sides with all angels right. A rhombus is a plane figure bounded by four sides with all sides equal. A square is a plane figure bounded by four sides with all angels right and all sides equal. If a quadrilateral is both rectangle and a rhombus then the...
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Waiting for answer What is the contrapositive to this statement? Statement: If...
C. If you don't eat, then you don't feel hungry. The contrapositive to a statement is the inverse of the converse (or the converse of the inverse) of the statement. If ##p## and ##q...
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Waiting for answer Describe a test to distinguish between calcium chloride and...
You could carry out a flame test to identify the metal component or you could use pH paper or silver nitrate solution to identify the anion. To carry out a flame test, nichrome wire is heated to red heat and dipped in concentrated hydrochloric acid to clean it. It is then dipped in the solid sample...
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Waiting for answer Why is the enthalpy of neutralization between a weak acid an...
See explanation. In every reaction in aqueous solution, the fundamental chemical reaction is: ##H^(+)(aq)+OH^()(aq) H_2O(l)## Since this reaction involves bond formation only, e...
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Waiting for answer BrO3(aq) + Sb3+(aq) = Br(aq) + Sb5+(aq) (acidic solution...
##BrO_3^()+3Sb^(3+)+6H^(+)rarrBr^()+3Sb^(5+)+3H_2O## We can use to help balance this equation. Consider first the bromate(V) ion ##BrO_3^##. It is converted to ##Br^## ##BrO_3^()rarrBr^## ##+5rarr1## Bromine has changed from +5 to 1. This will require the addition of 6 electrons: ##Br...
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Waiting for answer When a positive integer k is divided by 7, the remainder is...
It is 1. If a positive integer k has a remainder 6 when it is divided by 7, it is of the form: ##k = 7n + 6##, where n is an integer. Hence, k+2 would have such a form: ##k+2 = 7n...
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Waiting for answer How do you write an equation with Xintercept of 3 and yint...
##y = 2/3x + 2## By definition the xintercept of 3 is the point (3, 0) and By definition the yintercept of 2 is the point (0, 2). Because we have two points we can use the point...
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Waiting for answer How many time zones are in China?
One. China has one time zone for the entire country.
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Waiting for answer How many inches are in 1/3 yard?
##12## inches conversion factor: ##1## yard = ##3## feet ##[1 yard]/3 = [3 feet]/3## ##1/3## yard = ##1## foot ##1## foot = ##12## inches so ##1/3## yard = ##12## inches
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Waiting for answer How do you find the mean, median, mode and range for 53, 32,...
median is the central value so we must first put the numbers in order from smallest to largest ##24, 32, 49, 53, 62## The central number (number in the middle) is 49 therefore the mean is 49 We find the mean by adding all the numbers together then dividing that sum by the amount of numbers that wer...
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Waiting for answer What impact did the Indian Removal Act have?
Continuity of Expansionism, the Trail of Tears, and the increase of tensions between the US and many Native American tribes First off, Andrew Jackson's Indian Removal Act forced Nati...
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Waiting for answer Is iced water a pure substance? Why?
Yes iced water is a pure substance. Both ice and liquid water are the same substance. ##H_2O## Though ice water is a mixture of both solid and liquid it is a pure substance, based o...
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Waiting for answer Is Calcium paramagnetic or diamagnetic? And why.
An isolated ##Ca## atom is diamagnetic, since its shows no unpaired electrons. ##Ca: [Ar]4s^2## However, an element's magnetic character does not depend solely on , it depends on the empty orbitals that are next to the valence orbitals as well. Notice that you have a vacant 3dorbital very cl...
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