Homework answers and tutorials

Waiting for answer What is the additive inverse property?
Additive Inverse Property For all element ##a##, there is a unique element ##a## such that ##a+(a)=0## I hope that this was helpful.
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Waiting for answer How do you write ##137.5%## as a fraction?
##11/8## We can write a percentage as a fraction by taking the percentage and dividing it by 100. In this case: ##137.5% = 137.5/100## We want to simplify our fraction now, and the...
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Waiting for answer How many atoms are in the universe?
Under the given assumptions (a) Assume that all of the atoms in the universe are hydrogen atoms in stars. (b) Assume that is a typical star composed of pure hydrogen with a density of ##1.4gcm^3## and a radius of ##7xx10^8m##. (c) Assume that each of the roughly 100 billion stars in the Milky Wa...
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Waiting for answer Why does Sodium lose an electron and attains +1 charge?
Because sodium has 1 electron in the valence shell and it prefers to lose it rather than gain extra 7 electrons. Sodium has 1 electron in its valence shell (outermost orbit). When an...
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Waiting for answer There are 150 calories in a cup of whole milk and only 82 in...
##approx 45 1/3 %## ##(15082)/(150)=34 / 75 approx 45 1/3 %##
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Waiting for answer What is the molar mass of methane, ##CH_4##?
##16g//mol## Simply add the molar masses of each atom that makes up the molecule, obtaining each element's molar mass from . In this case, we get ##M_r (C)+4Mr(H)=12+(4xx1)=16g//m...
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Waiting for answer What is vant Hoff equation ?
It is an equation that relates equilibrium constant to temperature. can change according to temperature. The Van't Hoff equation defines the change in equilibrium constant as a fun...
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Waiting for answer What is acetylcholine classified as?
It is a neurotransmitter Acetylcholine is a neurotransmitter that is responsible for making muscles move. For example, when you move your arm, a flow of acetylcholine is released, an...
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Waiting for answer How do I find the foci of an ellipse if its equation is ##x^...
##x^2/36+y^2/64=1## ##a^2=64## ##b^2=36## The center is ##(0,0)##. The yaxis is the major axis. We know this because the ##y^2## term has the larger denominator. We find the foci using the following equation and solving for ##c##. ##c^2=a^2b^2## ##c^2=6436## ##c^2=28## ##c=sqrt(2*2*7)## ##c...
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Waiting for answer Is a rectangle a parallelogram always, sometimes or never?
Always For this question all you need to know are the properties of each shape. The Properties of a Rectangle are 4 right angles 4 sides (Polygonal) 2 pairs of opposite congrue...
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Waiting for answer What is the hybridization of H2O?
See explanation. To do the hybridization of ##"H"_2"O"##, we look for the central atom in the molecule. The central atom is oxygen, so we do the hybridization with respect to oxygen....
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Waiting for answer How can you prove that ##d/dx(cothx) = csch^2x## using the...
Keeping in mind that the hyperbolic derivatives are ##d/dx (sinh(x))=cosh(x)## and ##d/dx (cosh(x))=sinh(x)## and that the fundamental hyperbolic identity is ##cosh(x)^2sinh(x)^2=1##, and by using the , we find: ##d/dx(coth(x))=d/dx(cosh(x)/sinh(x))=## ##(d/dx(cosh(x))sinh(x)cosh(x)d/dx(sinh(x))...
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Waiting for answer In what order are the elements of the periodic table arrange...
In numerical order (left to right), they are arranged by the number of protons in the nucleus of a single atom of each element. Aside from that, you'll notice that the rows have dif...
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Waiting for answer What is the difference between alkanes, alkenes and alkynes...
The main differences between alkanes, alkene and alkynes are their functional groups and degree of unsaturation. Alkenes, alkanes and alkynes are all hydrocarbons. This means that they are organic molecules that contain only hydrogen and carbon in its molecular structure. Alkanes have a general f...
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Waiting for answer Can someone define and list the three processes in the water...
Evaporation, Condensation, Precipitation Evaporation: Sunlight increases the temperature of water. When temperatures reaches its boiling point water turns into vapors and evaporates...
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Waiting for answer How many sex chromosomes does the normal human female inheri...
A human female normally inherits one sex chromosome, the X chromosome. Humans have two sex chromosomes. Males Have one X and one Y chromosome, while females inherit two X chromosomes...
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Waiting for answer How many hybrid orbitals are there in HNO3?
Before occurs, the atoms have thirteen hybridized orbitals. After bonding, there are six hybrid orbitals in HNO₃. The Lewis structure of HNO₃ shows that it is a hybrid of two structures. The N atom has steric number SN = 3. The electron geometry is trigonal planar. The N atom is sp² hybridized....
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Waiting for answer Why Polystyrene is foamy?
Not all polystyrene are foamy. The ones that are foamy have been expanded by air or have trapped air in its mold. Here is polystyrene pellets before and after expansion Here is anot...
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Waiting for answer How do you convert 9/45 into a percent and decimal?
Divide the numerator by the denominator to change the fraction into a decimal fraction. Then multiply by 100% to change it to percentage. A decimal fraction is a fraction with the d...
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Waiting for answer What is an oxymoron?
An oxymoron is a seemingly contradictory statement. On the surface an oxymoron seems to be contradictory, for example, "Child is father of man". On first inspection how can a child b...
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