Investigating the Solubility of Table Salt in Distilled Water at Different Temperatures
The aim of this essay is to explain and discuss the drug cannabis and
its effects in relation to biochemical, behavioural and psychological
factors. The introduction will outline a brief history relating to
the drug and include both the medicinal and recreational purposes of
its use. The main discussion will explain how the drug chemistry
affects the nervous system emphasising what neurotransmitter is
effected and also what behavioural and psychological implications this
has on the user. Finally I will conclude by summarising the main
points of the discussion outlining both the long and short term
overall effects of cannabis, evaluating what the relative costs and
benefits are to the user.
Cannabis, commonly known as Marijuana is a member of the Cannabinaceae
originating from the hemp plant (Cannabis Sativa). It is described
as a naturally grown erect, bushy herb plant with saw toothed leaves
and fluted stalks ranging in height from three feet to twenty five
feet approximately. Cannabis is available in three main forms, as a
dried herb (usually known as grass), as a resin (usually known as hash
or hashish) that is extracted from the buds and flower heads and as a
sticky liquid (hash oil) which is prepared from the resin.
The exact origins of cannabis have never been clearly defined; however
the wild version is believed to have originated in Central Asia.
Historians believe that it was one of the first crops to be cultivated
by man for its fibre, and the ancient Chinese are believed to have
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...strate positive and significant harmful effects in man
attributable solely to the use of cannabis” (ACDM 1981)
BIBLIOGRAPHY
A Brief History of Cannabis -
www.hrc.wmin.ac.uk/hemp/history
/html
A Cannabis Chronology -
www.ukcia.org/newsite/culture
/history/chrono.html
Cannabis Information Network -
www.marijuana-hemp.com/cin/facts
POTOLOGY - Lifeline Publications (2000)
(Dr Nukes guide to the Science of Cannibis
& the Sociology of getting stoned)
Short term/long term affects -
www.trashed.co.uk/cgi-local/newframe
cgi?3&4
STREET DRUGS - Andrew Tyler
(The facts explained. The myths exploded)
(The drug workers bible)
The Effect of Solute Concentration on the Rate of Osmosis Aim: To test and observe how the concentration gradient between a potato and water & sugar solution will affect the rate of osmosis. Introduction: Osmosis is defined as, diffusion, or net movement, of free water molecules from high to low concentration through a semi-permeable membrane. When a substance, such as sugar (which we will be using in the experiment we are about to analyse), dissolves in water, it attracts free water molecules to itself, and in doing so, stops them from moving freely. The effect of this, is that the concentration of (free) water molecules in that environment goes down. There are less free water molecules, and therefore less water molecules to pass across a semi-permeable membrane, through which sugar molecules and other molecules attached to them are too big to diffuse across with ease.
Probably one of the oldest plants known to man, Cannabis was cultivated for fiber, food, and medicine thousands of years before it became the "superstar" of the drug culture (Schultes, 1973). Cannabis, as it turns out, not only has many usage's, but has been employed in various ways by different cultures.
The Solubility of Potassium Nitrate Aim To investigate how the solubility of Potassium Nitrate is affected by Temperature. Background Knowledge Potassium Nitrate (KNO3) is an ionic compound. The strong ionic bonds hold the compound in an ionic lattice which gives KNO3 its crystalline structure. These ionic bonds also have other properties which will affect my investigation, I must be aware of these properties for greater accuracy in my method.
the cell. As water is lost the vacuole gets smaller as it is used to
After smoking, or consuming marijuana, it is distributed in the brain. The concentration of marijuana in the brain may be governed by an active transport process in the choroid plexus network of blood vessels in the brain which regulates intraventricular pressure by absorption and secretion of cerebro spinal fluid. one scientific experiment it gave an example of how the distribution of marijuana in the central nervous system could effect man. At a high dose of 30 mg./kg. marked sedation and pronounced motor incoordination peaked at the one hour interval subsiding in 8 hours when over reaction occurred to external stimuli; man reveals incapacitation of cognitive and motor function. High concentrations of marijuana are usually found in the following parts of the brain: the frontal cortex (the general association area), and hippocampus (short term memory and oreintation). As a result, perception of time, mood and general cordination is impaired. It is apparent that marijuana intoxication effects the neurological functions and usually disappears in 24 hours, but can become a permanent malfunction.THC effec...
Table 2 shows the average percent change from the three trials. The average percentages were calculated by adding the percentages from the three trials for each cup and then dividing by three which was the number of trials. The calculations used to calculate water potential for each of the solutions are shown. The formula for solute potential used was -iCRT. Figure 1 shows the graph of the different sucrose solutions in relation to the water potential of those solutions.
moves along the cells of the root and up the xylem to the leaf. Water
Marijuana is a drug that divides people. Some people claim it as the wonder drug of the '90s, capable of relieving the symptoms of many serious illnesses. Others curse the day the cannabis plant was ever discovered. From pain relief to stimulating the appetites of patients on chemotherapy, marijuana seems to have plenty going for it as a medicine. The legalization of marijuana is a large controversy in many parts of the world today, but the obvious negative effects that the drug induces has kept it from being legalized. Many researchers have a strong positive attitude towards marijuana. It has been said that the drug is “worth investigating and even providing as a medicine for pain relief, severe nausea, and appetite stimulation for seriously ill patients” (Zimmerman 2). On a more negative side, studies have also found in many cases of pregnant women who smoke marijuana, that chemicals in the drug have halted early pregnancy. Scientists have determined a link between activation of the biological receptors that respond to cannabinoids (the psychoactive ingredients in marijuana) and abrupt interruption of pregnancy at a very early stage (Ferguson 71). The short-term effects of marijuana have also been researched and are widely known. Some of these effects include problems with memory and learning, distorted perception (sights, sounds, time, touch), trouble with thinking and problem solving, loss of coordination, increased heart rate, anxiety and panic attacks (Ferguson 23). A new analysis by Bachman examines how marijuana is potentially devastating to adolescents because it suppresses motivation, drive, and commitment to family and school. Although these researcher’s studies have covered many topics about marijuana, the actual long-term effects caused by inhaled marijuana smoke is a topic that has failed to be covered in extent.
The legalization of marijuana is considered a controversial issue, something that can benefit people for medical purposes, but what about recreationally? Marijuana has been illegal since 1937, but there’s never been a bigger push for legalization. There are several reasons why it is illegal, because of government propaganda and big industry not wanting to lose money, but this will be discussed later. The purpose of this paper is to educate, theorize, and discuss various aspects of marijuana, such as its history, development, and the advantages and disadvantages of marijuana legalization. Finally, my personal reflection on legalization and marijuana in general will be discussed.
Stanley, Janet E., Stanley J. Watson, and John A. Benson. Marijuana and Medicine: Assessing the Science Base. Washington D.C.: National Academy P, 1999.
is put in pure water it will become turgid and it will not burst due
Investigating the Hardness of Water Planning Aim To investigate the hardness of water in 5 different water solutions Background knowledge about hard water The hardness of water is caused by the presence of Calcium 2+ and magnesium 2+ ions in the water. These minerals in water can cause some everyday problems. They react with soap and produce a deposit called "soap scum" that remains on the skin and clothes and, because it is insoluble and sticky, cannot be removed by rinsing. Soap curd changes the pH of the skin and may cause infection and irritation. It also remains on the hair making it dull and difficult to manage.
6. I then rinsed out the beaker and glass rod into the flask to make
Marijuana is an extremely popular drug, not only in America, but in every other country in the world as well. However, there are many people who do not know exactly what it is or where it comes from. Marijuana is a blend of flowers, seeds, leaves, and stems from the Indian hemp planted called Cannabis. This plant contains a chemical called tetrahydrocannabinol (THC), which causes the “high” feeling that users experience when smoking it (“Marijuana: Effects, Medical Uses & Legalization”). The THC in marijuana is analogous to the nicotine in tobacco, but it is not as harmful. They both have many similarities, but they also have significant differences.
Solubility of Potassium Chlorate Solubility is the maximum amount of solid that will dissolve in 100g of solvent. The solubility of a substance depends on the type of ionic particles in it. So the solubility of each substance is different. The formula of solubility is: SOLUBILITY(g/100g)= (SOLUTE / SOLVENT) * 100 I did an experiment to prove this and find the solubility of potassium chlorate, an ionic solid.