Homework answers and tutorials

Waiting for answer What are examples of physical properties? Chemical properti...
I am going to give you five examples each, OK? Physical properties describe a thing, show some features of an object:  length;  hardness;  color;  electric condictivity;  temper...
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Waiting for answer Calculate the mass of 500 atoms of iron (fe)?
##4.63*10^20## gram You can get to the answer in two steps: calculate: 500 atoms = ##color(red)x## mol ? using Avogadro's constant. calculate: ##color(red)x## mol = ##color(red)...
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Waiting for answer Is temperature a discrete or continuous variable?
Temperature is a continuous variable. Temperature is a continuous variable because its value can assume any value from the set of real numbers between 273 degrees Celsius (absolute...
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Waiting for answer How can the enthalpy change be determined?
change can be determined by using the equation: enthalpy change = mcΔT, where m is the mass of your solution, c is the , and ΔT is the change is temperature. Thus, in order to determine or calculate the enthalpy change you will need to know all of these measurements or to find them all experiment...
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Waiting for answer How do you find three consecutive odd integers whose sum is...
Let the smallest of the three consecutive odd numbers be ##x## The next two consecutive odd integers can be written as ## (x+2) , (x+4)## Adding them: ## (x) + (x+2) + (x+4) = 69## ## 3x + 6 = 69## ## 3x = 63## ## color(purple)(x = 63/ 3 = 21## so ,## x+2 = 23, x+ 4 = 25## The numbers are ##...
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Waiting for answer How can recessive traits skip generations?
Recessive traits can skip generations because a dominant phenotype can be produced by either a homozygous dominant genotype or a heterozygous genotype. So two heterozygous individuals would have the dominant phenotype for a trait, but since they each have a recessive allele, they both could pass a r...
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Waiting for answer What is the complex conjugate of ##sqrt(13)##?
The complex conjugate of ##sqrt(13)## is ##(sqrt(13))## The complex conjugate of ##a+bi## is ##abi## ##sqrt(13)## can be written as ##0+sqrt(13)i## So its complex conjugate is...
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Waiting for answer At ##20°C##, the density of copper is ##8.9## ##g####/####cm...
Good question. Remember, that we compare a 3rd row transition metal ##(Pt)##, to a 1st row transition metal ##(Cu)##. ##"Molar mass (Cu)"## ##=## ##63.55## ##g*mol^1##. ##"Molar m...
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Waiting for answer State the Pauli exclusion principle in your own words. Expla...
The Pauli Exclusion Principle is in fact the main reason why we have the idea of an "" and why some transition metals like Chromium have access to ##\mathbf(12)## electrons, and sometimes up to even ##\mathbf(18)##. The Pauli Exclusion Principle essentially states: No two electrons may have en...
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Waiting for answer How do you graph the function ##y=5xx^2##?
graph{5xx^2 [14.24, 14.23, 7.12, 7.12]} First you realise that ##5xx^2=x(5x)## which will give the ##y=0## solutions ##x=0## and ##x=5## for ##(0,0)## and ##(5,0)## Then, put the halfway##x## (##2.5##) in the equation to get the top of the graph ##y=5*2.52.5^2=6.25## for ##(2.5,6.25)## Yo...
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Waiting for answer How do you calculate the moment of inertia of a beam?
Basically, we need to add up all of the products of ##m*r^2##. This depends on a few factors, but here we will look at the most common two types of problems. If you would like more complex problems  ask for beams without uniform mass distributions. The formula for the is ##I=summ*r^2##, but the...
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Waiting for answer What is polarity?
It is the difference in electronegativity between two atoms. Polarity arises when an electronegative and an electropositive atom bond together. For instance, an oxygen bonded to a hy...
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Waiting for answer What is ethology?
Ethology is the study of under natural conditions (source: MerriamWebster ). Note that this term can also refer to the study of the formation of human character. The term ethology was first defined as the study of animals in their natural habitat by Isidore GeoffreySaint Hilarie in 1859 (Jaynes,...
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Waiting for answer How does the formation of coal differ from that of natural g...
Coal is formed by ancient plant materials while oil and gas forms from, mostly, ancient algae and other microorganisms found in ancient seas. Coal forms on land in massive peat bo...
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Waiting for answer Why is water potential of pure water zero?
is the potential energy of water per unit volume relative to pure water in reference conditions. Water potential quantifies the tendency of water to move from one area to another due to , gravity, mechanical pressure, or matrix effects such as surface tension. Water potential has proved especially u...
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Waiting for answer How do you determine whether the function ##f(x) = xe^x## i...
To determine concavity, analyze the sign of ##f''(x)##. ##f(x) = xe^x## ##f'(x) = (1)e^x + x[e^x(1)]## ## = e^xxe^x## ## = e^x(x1)## So, ##f''(x) = [e^x(1)] (x1...
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Waiting for answer What is purging? why mostly purging with nitrogen is preffer...
Purging is the displacement of air (Oxygen) and moisture from a by bubbling nitrogen gas into the solvent. nitrogen is preferred because it is chemically inert and it is cheap when compared with other inert gases like helium or neon. In industries, purging is important because it will prevent explo...
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Waiting for answer How do you convert 36 cm/sec to mph?
1cm/s = 0,022369362920544023 mph it's 0,8052970651395848 36cm/s = 0,805297 mph Using conversion tables, unit notation and cancelling numerators with denominators, thus: 36cm/s x 1...
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Waiting for answer What are some examples of speed of sound?
supersonic air planes are good example of sound speed, they travel 340 meters per second, and as the light they travel as wave but what differ they from each other is that light travels a million times faster. Another good example of sound speed is when you are in a thunder storm and you see a light...
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Waiting for answer What is the value of 4 cubed?
4 * 4 * 4 = 64 "Cubing" a number means multiplying it by itself three times.
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