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South America, the fourth largest continent on Earth, encompasses an area of 6,880,706 square miles (17,821,028 square kilometers). This is almost 12 percent of the surface area of Earth. At its widest point, the continent extends about 3,200 miles (5,150 kilometers). South America is divided into 12 independent countries: Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Guyana, Paraguay, Peru, Suriname, Uruguay, and Venezuela. French Guiana, an overseas department (territory) of France, also occupies the continent.
The continent of South America can be divided into three main regions with distinct environmental and geological qualities. These are the eastern highlands and plateaus, the...
Science: Gastric juice contains 2.98 g HCL per liter. If a person produces about 2.5 L of...
`Al(OH)_3+3HCl rarr AlCl_3+3H_2O`
So to neutralize 3 HCl moles we need 1 mole of `Al(OH)_3` .
Amount of HCl in 1L of gastric juice `= 2.98g`
Amount of HCl in 2.5L of gastric juice `= 2.98xx2.5 = 7.45g`
So per day a person will produce 7.45g of HCl.
Molic weight of HCl `= 36.5g/(mol)`
Amount of HCl moles produced per day `= 7.45/36.5`
Amount of HCl moles produced per day `= 0.204`
`Al(OH)_3:HCl = 1:3`
Amount of `Al(OH)_3` moles needed `= 0.204/3 = 0.068`
Molic weight of `Al(OH)_3 = 78g/(mol)`
Weight of `Al(OH)_3` needed to neutralize HCl ` `
Geology is the scientific study of Earth. Geologists study the planetts formation, its internal structure, its materials, its chemical and physical processes, and its history. Mountains, valleys, plains, sea floors, minerals, rocks, fossils, and the processes that create and destroy each of these are all the domain of the geologist. Geology is divided into two broad categories of study: physical geology and historical geology.
Physical geology is concerned with the processes occurring on or below the surface of Earth and the materials on which they operate. These processes include volcanic eruptions, landslides, earthquakes, and floods. Materials include rocks, air, seawater, soils, and...
Speech: What are some interesting speech topics for a five minute speech?Fun or serious topic
I always love speeches on political scandal. You would have plenty of ammunition right now. You can talk about the Governor of Illinois trying to sell Obama's Senate seat. Or you can fall back on Thurman or Bird or Spitzer. Then there is Ted Steven's bridge to nowhere. It can be a commentary on the abuse of political power.
Petroleum Notes for the Classroom
this is the material for petroleum
Physics: Child sitting in a tree throws his apple from the height of 4.0 m with a velocity...
For this question, you can use:
`dy= V_(iy) * t + 1/2at^2`
Now first we shall assign the values needed to solve for the time required.
`dy` = -4 (direction is down)
`V_iy` = 5m * sin (35) = 2.8679
`a ` = acceleration due to gravity = -9.81m/s^2 (direction is down)
`t ` = time = ?
By substitution, we can now have:
`-4 = 2.8679t - 4.9t^2`
Arranging the equation into standard form:
`4.9x^2 -2.8679x - 4 = 0`
To solve for the value of t, quadratic equation is used.
`x = (-b +-sqrt(b^2 - 4ac))/(2a)`
The two values derived from this equation are -0.657 and 1.24. we will choose the positive time which is 1.24 seconds....
A simple quiz on biology
Science: What is the order of colors in a rainbow?
A rainbow is made by the reflection and refraction of light that interacts with raindrops. Depending on how this interaction occurs with your location relative to the sun and the raindrops you may see a primary and even a secondary rainbow.
The interaction that occurs to create the primary rainbow will produce a spectrum of colors in order Red - Orange - Yellow - Green - Blue - Indigo -Violet (ROY G BIV) with Red occuring on the outside edge of the rainbow to Violet occuring on the insdie edge (closest to the center) of the rainbow.
The extra reflection that occurs to produce the secondary rainbow causes the colors to reverse order. So on the secondary rainbow Red will occur on the inside edge followed by Orange,...
Biology (from the Greek bios, meaning "life") is the scientific study of all forms of life, including plants, animals, and microorganisms.
Biology is composed of many fields, including microbiology, the study of microscopic organisms such as viruses and bacteria; cytology, the study of cells; embryology, the study of development; genetics, the study of heredity; biochemistry, the study of the chemical structures in living things; morphology, the study of the anatomy of plants and animals; taxonomy, the identification, naming, and classification of organisms; and physiology, the study of how organic systems function and respond to stimulation. Biology often interacts with other...
alkylation process invloved in petroleum industry
Secondary enrichment of mineral deposits
Secondary enrichment is a naturally occurring, near-surface process whereby a valuable substance is dissolved, carried downward in solution, and redeposited in a concentrated state. This ore-deposition process is also known as downward enrichment or supergene (literally, “origin from above”) enrichment. secondary enrichment does not create a new and separate mineral deposit; rather, it concentrates and makes more valuable an existing deposit. Some low-grade mineral deposits have been made ore-grade as a result of secondary enrichment.
Quiz: Scientific Method
This is a quiz on the scientific method for middle school students
In 1937, at the University Institute for Legal Medicine and Scientific Criminalistics in Jena, Germany, Walter Specht introduced the use of luminol as a presumptive test for blood at crime scenes. This is forensically important, because perpetrators often wash away visible signs of blood at the scene, in an effort to remove all possible evidence of the crime.
A presumptive test for blood is used when forensic investigators have strong reason to suspect that blood is present but is not currently visible at the scene. A presumptive test will neither prove nor disprove, in and of itself, the presence of blood at a crime scenet will merely...
Science: How can a fish survive in water with the oxygen in it only 4 percent of what...
Unlike mammals with lungs, fishes have gills as the respiratory organ. Gills are a series of membranes loaded with blood capillaries, located on each side of the head of the fish. As water passes over this system of extremely fine gill membranes, the contact area for oxygen exchange increases dramatically. Aided by a highly efficient water pumping system that involves the mouth and the outer cover of the gills, called the operculum, the fish gallops copious amount of water per unit time and this makes up for the low percentage of available oxygen. This way the fish can actually extract and absorb up to 85% of available oxygen out of the water. Since water contains only ~4% of the available oxygen that air at sea level does, such a...
Solar System Test or Study Guide
This sheet can be used as a test or a study guide.
Chemistry: What are some examples of homogeneous mixtures and heterogeneous mixtures?
A compound is a chemical combination of two or more elements in definite proportions. For example, two hydrogen molecules + one oxygen molecule= one water molecule. A solution is a physical combination of two or more chemicals mixed evenly (salt that is dissolved in water). Solutions are also known as homogenous mixtures. A mechanical mixture is a physical combination of two or more chemicals that are not evenly mixed (hot fudge on ice cream). Mechanical mixtures are also known as heterogenous mixtures.
Homogenous: milk, kool-aid, blood, lotion, window cleaner, glue, etc.
Heterogenous: pizza, cereal and milk, rocks in the sand at the beach, banana splits, etc.
A short quiz on birds and their biology
Identity Theft: Do you think with current technology, people are more susceptible to...
In many ways, new technologies are making it easier for us to fall victim to identity theft. This is particularly true because of the rise of internet commerce and the increasing use of credit and debit cards.
With the rise of internet commerce, more and more of our personal information is on the internet. We provide such information, for example, to our banks or to the colleges we attend. These institutions can be susceptible to being hacked. If this happens, our identities can be stolen. This would have been much harder in the days before the internet.
In addition, we have moved away from using things like cash and checks and are using credit and debit cards much more than ever before. These are more...
The lymphatic system is a network of vessels that transports nutrients to the cells and collects their waste products. The lymph system consists of lymph capillaries and lymph vessels that are somewhat similar to blood capillaries and blood vessels. In addition, it includes lymph ducts (tubes that carry fluids secreted by glands) and lymph nodes (reservoirs that filter out bacteria and other toxins from the lymph that passes through them).
In the circulatory system, blood flows from the heart, through the arteries, and into capillaries that surround all cells. When blood reaches the capillaries, a portion of blood plasma (the liquid portion of the blood) seeps out of the capillaries and into...
Physics: What is a unit of mass?
Mass is a property of matter, and its units are usually measured in grams (g) or kilograms (kg) worldwide and additionally ounces (oz) and pounds (lbs) in the US. On the small scale, atomic mass, or the mass of elemental particles (protons, neutrons, electrons, and whole atoms) are measured relative to an atom of carbon-12, which is set to have a mass of 12.0000. Mass should not be confused with weight, which a measurement of how heavy matter is when subject to the force of gravity, so:
weight = (mass) * (force of gravity) or w=mg.