Homework answers and tutorials

Waiting for answer Joy needs to buy three blouses for work. She can buy two for...
##$43.50## Joe can buy two blouses for ##$29##, hence one blouse will be for ##29/2=$14.50##. Hence, she will pay for three blouses ##$29+$14.50=$43.50##.
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Waiting for answer When 8.4g of NaHCO3 is added to a solution of CH3COOH weighi...
The mass of the residue, or sodium acetate solution, should be ##"24.0 g"## of sodium acetate solution. In this reaction, sodium bicarbonate reacts with acetic acid to produce sodium acetate, carbon dioxide, and water. The carbon dioxide bubbles out of solution, leaving behind a sodium acetate solu...
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Waiting for answer For what value of ##k## will ##x+k/x## have a relative maxim...
There is a relative minimum when ##x=2## with ##k=4##, but there is no possible value of k which gives a relative maximum when ##x=2## Let ##f(x) = x+k/x## Then differentiating...
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Waiting for answer How can you tell a gas is a halogen?
They are right next to the Nobel gasses on . The halogens are five nonmetallic found in group 17 of the periodic table. The term "halogen" means "saltformer" and containing halog...
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Waiting for answer What is benzene used for today?
Benzene has various uses, and is found in cigarette smoke and crude oil. Benzene is an important organic chemical compound with the chemical formula ##"C"_6"H"_6##. Human exposure...
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Waiting for answer What is an example of a homologous and a vestigial structure...
The classic example of homologous structures are the bones of limbs in vertebrate animals. A vestigial structure is an atrophied one that no longer serves a useful function. The bon...
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Waiting for answer What type of heterotroph eats animals
Carnivore All animals are heterotrophs as in they can't produce their own energy like plants can which is why they are autotrophs. Herbivores eat plants, carnivores eat animals, and...
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Waiting for answer Gasoline has a density of ##"0.73 g/cm"^3##. How many liters...
##"44 L"## The first thing to do here is to make sure that we have the proper units needed to calculate the mass of gasoline required to increase the mass of the car by ##m_"gas" =...
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Waiting for answer How do you tell whether a function is even, odd or neither?
To determine this, plug ##x## in for ##x## and see what happens. The first step is to replace ##x## with ##–x##. In other words, calculate ##f(x)##. If the function doesn't chang...
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Waiting for answer Calculate the number of grams of copper(I) oxide reacted and...
Here's what I got. The first thing to do here is make sure that you're working with a balanced chemical equation, which in this case looks like this ##"Cu"_ 2"S"_ ((l)) + 2"Cu" _...
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Waiting for answer At a restaurant, you can choose from 2 appetizers, 4 main co...
24 First you need to understand the process of selection and arrangement. Suppose you have 4 numbers  1, 2, 3, 4 and you have to form 3 digit numbers with all these numbers atmost...
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Waiting for answer How do you factor ##2x^2x21##?
##2x^2x21 = (2x7)(x+3)## Assuming that ##2x^2x21## can be written as ##(ax+c)(bx+d)## ##color(white)("XXXX")####color(white)("XXXX")##with ##a, b, c, d in ZZ## Since the sign...
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Waiting for answer How do you prove ##(1  tanx) / (1 + tanx) = (1  sin2x) / (...
Multiply the left side in the numerator and denominator by 1tanx and simplify to get the answer: ##(1tanx)^2 / (1tan^2 x)## =##(1+tan^2x 2tanx)/(1 (sin^2x/cos^2x)## = ##(sec^2x 2tanx)/((cos^2x sin^2x)/cos^2x)## (because ##1+tan^2x = sec^2x##) =##(12tan x cos^2x)/cos(2x)## (because ##...
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Waiting for answer Does the nitrate ion have one long ##N¬O## bond and two shor...
If anything, you might predict that NO₃⁻ has one short NO bond and two long ones. But all NO bonds in NO₃⁻ are the same length. You can draw three equivalent Lewis structures for NO₃⁻. Each has an N=O double bond and two NO single bonds. The actual structure is none of these. It is a resonance...
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Waiting for answer What is the law of conservation of mass in mathematical term...
For any process: initial mass = final mass. This simply reflects the idea that the conservation of mass says that the weight of what you make in a process is the same as the weight of what you started with. OK.
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Waiting for answer How do you evaluate ##arcsin (sin (5pi/4))##?
The solutions are ##(5pi)/4## and ##(pi)/4## The first solution has a direct answer, because ##arc sin{sin(z)}=z## with every number ##z##, so ##(5pi)/4## is a solution. It´s like a...
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Waiting for answer What is surface tension?
Surface tension is the energy, or work, required to increase the surface area of a liquid due to intermolecular forces. Surface tension in a liquid is caused by the attractive force...
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Waiting for answer What is imprinting?
In regards to , imprinting occurs when, early in an animal's life, the animal forms an attachment to another organism and learns the characteristics of that organism. Imprinting lik...
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Waiting for answer If Sr 90 undergoes beta decay, then what is the resulting el...
Rb 90, same atomic weight. is a type of radiation where a proton in the starting element changes into a neutron. A byproduct of this is a beta particle, or an electron. There is no...
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Waiting for answer Is the hypothalamus in the Temporal Lobe?
No. It is located above the brainstem and below the thalamus. In humans, the hypothalamus is generally located below the thalamus, hence the name hypo (below) thalamus (chamber). I...
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