Trending in Science
DNA Isolation Methods
Deoxyribonucleic acid (DNA) isolation is an extraction process of DNA from various sources. Methods used to isolate DNA are dependent on the source, age, and size of the sample. Despite the wide variety of methods used, there are some similarities among them. In general, they aim to separate DNA present in the nucleus of the cell from other cellular components.
Isolation of DNA is needed for genetic analysis, which is used for scientific, medical, or forensic purposes. Scientists use DNA in a number of applications, such as introduction of DNA into cells and animals or plants, or for diagnostic purposes. In medicine the latter application is the most common. On the other hand,...
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 ` `
Bacteria are very small organisms, usually consisting of one cell, that lack chlorophyll (a green pigment found in plants that allows for the production of food). Except for viruses, they are the smallest living things on Earth. Many bacteria are so small that a million of them, laid end-to-end, would measure no more than about five centimeters (two inches). The term bacteria is the plural form of the word bacterium, which represents a single organism.
Bacteria are found everywhere, in the air, soil, water, and inside your body and on your skin. They tend to multiply very rapidly under favorable conditions, forming colonies of millions or even billions of organisms within a space as small as...
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,...
alkylation process invloved in petroleum industry
Chemistry is the study of the composition of matter and the changes that take place in that composition. If you place a bar of iron outside your window, the iron will soon begin to rust. If you pour vinegar on baking soda, the mixture fizzes. If you hold a sugar cube over a flame, the sugar begins to turn brown and give off steam. The goal of chemistry is to understand the composition of substances such as iron, vinegar, baking soda, and sugar and to understand what happens during the changes described here.
Both the term chemistry and the subject itself grew out of an earlier field of study known as alchemy. Alchemy has been described as a kind of pre-chemistry, in...
Quiz: Scientific Method
This is a quiz on the scientific method for middle school students
In the United States, the use of controlled substances is governed at the federal level by the Controlled Substances Act of 1970. The most strongly controlled substances are listed in Schedule I of the act, and those under the least control are listed in Schedule V. Amphetamines, along with cocaine, morphine, and phencyclidine (PCP), are listed in Schedule II. Drugs in this class have a high potential for abuse and also have accepted medical uses within the United States (with severe restrictions). Abuse of Schedule II drugs may lead to severe psychological dependence, physical dependence, or both.
Amphetamines are easy to produce, are cheap to buy, and cause effects in the body similar to those of cocaine. Most illicit, or...
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.
Science: What is the largest muscle in the human body?
The gluteal muscles are largest. The gluteus minimus and maximus comprise this group. They are your buttocks. A very close second is the bilateral latissimus dorsi muscles which are your "lats". They run more than half way up your back and wrap around laterally (the sides). They connect distally in the hip or coxal area. The gluteals are indeed much thicker and have more mass. Another large muscle group is the adductor group on the anterior thigh and also the quadriceps group which is also on your anterior thigh(front thigh). As you can imagine, the muscles of the legs are very strong inpart because they help to support your weight. The masseter muscles of the bilateral jaws are also very strong, and the strongest of all.
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...
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...
Physics: What is the formula for pressure?
The formula for pressure is
P = F/A
In this equation, P stands for pressure while F stands for force and A stands for area. Pressure is typically measured in a unit called the Pascal.
So what this means is that the amount of pressure that is exerted on an area is determined by the size of that area and by the amount of force that is pressing against it.
Therefore, if you have a given amount of force, you will have more pressure if it presses down on a small area than if it presses down on a large area.