Sunday, April 30, 2017

dialogue to show cause and effect

Dialogue : Reaction kinetics and discoloration of trafic light


Ayu: hi al,

Al: hai ayu,

Ayu: what are you doing?

Al: i'm doing a trial on the reaction kinetics and the color change of the solution
Ayu: how to do it?

Al: 1. Put 50 ml of solution into the measuring flask
     2. added 5 - 10 ml indicator
     3. tutu the gourd
 Ayu: wooow ... the solution is yellow .

Al: then shaken slowly, what happened?

Ayu: yellow color turns red

Al: well last, shake loudly, what happened?

Ayu: when shaken loudly, it turns green to color. Why color change occurs when given different actions? Can you explain.

Al: so the change occurs because the indicator is reduced with alkaline and produces a yellow color, when slowly shaken oxygen oxidation and produces a red color, when shaken violently again turns green due to the continued oxidation of the solution.

Ayu: ooo ... so the color change is affected by several factors:
1. indicators
2. redox reaction
3. oxygen
4. Oxidation

Al: yes, right.

Ayu: thanks for the explanation.


When we start with an effect and ask why it occurred, we find a cause; but if we ask why again, what was just now a cause becomes an effect. An example of this is shown in the table below listing a column of effects and a column of causes (read left to right, top to bottom). This relationship continues as long as we continue to ask why. 
cause : the reason something happen
effect :what happen
cause & effect : explain why things happen.
We can divide the most common linking words and expressions of  cause & effect  into four group:
1. Coordinating Conjunctions: for (cause), so (effect)
2. Subordinating Conjunctions: because, since, if, whenever, so that, as (cause)
3. Conjunctive Adverbs: therefore, for this reason, as a result, thus, that is why, consequently (effect)
4. Preposition: because of, reasons for, consequences of, due to (cause)
 
you can watching on youtube :

Saturday, April 29, 2017

Research Article about chemical in everyday life




CHEMICALS IN FOOD



1. Saccharin (Saccharin)
           Saccharin is an artificial sweetener of the sodium salt of saccharin acid in the form of white crystalline powder, odorless and very sweet. This artificial sweetener has a sweetness level of 550 times the regular sugar. It is therefore very popularly used as a sugar substitute.
          There can be no doubt that most people who consider "sweet" are a favored taste, even by some animals "sweet" is a flavor that has its own appeal. Furthermore, the attraction to the sweet thing will continue to increase, as the general expression "sweeter, more interesting". Even this tendency for a child even an adult can be an addiction, meaning that the desire for sweet food will continue to grow, if not our own that limit it. This is especially since infants, the first known additives have been given sweetening.
         So far, the main sweetener used by humans is "sugar", then it develops into ingredients other than sugar. With this sweetener many people use it as a gift for children for a particular achievement or as an expression of love. This is further exploited by the industrialists who are especially engaged in the field of sugary foods (convectionery), such as candy, chocolate, drinks, pastries and so forth. They link the terms of advertising (promotion) between "sweetness" with love, luck, understanding, ease and various attractions that cause us more captivated by these high-sugar products.
Examples of experiments;
        Mice fed 5% saccharin for more than 2 years, indicating bladder mucosal cancer (the dose is roughly equivalent to 175 grams of saccharin a day for lifelong adults).
        Although the results of this study are controversial, most epidemiologists and researchers believe saccharin indeed increases the incidence of bladder cancer in humans by approximately 60% higher in users, especially in men.

2. Cyclamate (Cyclamate)
        Cyclamate is a white crystalline powder, odorless and approximately 30 times more mains than sugar cane (with a cyclamate content of about 0.17%). When the solution level is raised up to 0.5%, it will feel bitter and bitter.
       Cyclamates of 200 mg per ml in biochemical medium of human leucocyte and monolayer cells (in vitro) can result in the chromosomes of these cells rupturing. But experimental animals given sikiamat in the long run do not show double growth. In the UK the use of cyclamate for food and drink has been banned, as well as in some European countries and the United States.

3. Nitrosamines
       Nitrosamine is a colorless or slightly yellow crystalline material. These compounds are powders, granules or chunks and odorless. Carcinogenic (cancer-causing) that is often found in foods that are preserved using nitrite. Nitrite is widely used to preserve foods (such as fish, meat & cheese), but it also retains the original color of the meat and provides a distinctive aroma such as; Sausage, cheese, corned beef, jerky, ham, and others.
         If nitrite is supplemented with salt and acid, then its ability to preserve food will increase. Therefore, the use of nitrites is limited to 150 mg / kg of meat. Nitrosamines are very dangerous because they are formed by nitrites that react with secondary amino compounds with high temperatures occurring while frying such processed meats

4. Synthetic Dyes
        Food coloring agents are used to change the original color of a food or drink, as well as drugs. In addition, because of its safety, this dyestuff is also used in various types of non-food applications, such as household crafts or educational toys.
         Certain colors are associated with one's perception of taste. Usually food or beverages that smelled strawberry for example, then the manufacturer will give a red dye. So even for other tastes, like green for apple or melon flavor, yellow for pineapple or orange flavor, and chocolate for caramel.
        Dyestuffs are also used to reduce color variations that occur in certain commodities that naturally experience color changes due to season, processing, and storage. Examples of these commodities include florida oranges and salmon.
        In general, the purpose of adding dyes to a food / beverage is to meet the following purposes:
1. Identify the food / drink
2. Protect certain flavors and vitamins from light damage
3. Protecting commodities from fading colors due to light, or extreme temperatures.
4. Covers natural color variations
5. Strengthening the natural colors of commodities
        
The dye is divided into synthetic and natural dyes. Synthetic colors include FD & C Blue No.1 (or brilliant blue FCF or E133), FD & C Red No.40 (or allura red AC or E129), FD & C Yellow No.5 (or tartrazine or E102), FD & C Blue No.2 ( Or indigotine or E132), FD & C Green No.3 (or fast green FCF or E143), FD & C Red No.3 (or erythrosine or E127), and FD & C Yellow No.6 (or sunset yellow FCF or E110). The dye is called the primary dye, while the mixture of the dyestuffs is called secondary color.
         
From the observations in the markets found 5 most popular synthetic dyes in Indonesia are;
1) red
2) yellow
3) orange
4) green and
5) chocolate

        
Two of the five dyes, namely red and yellow are Rhodamine-B and methanyl yellow. These dyes include industrial dyes for coloring paper, textiles, paints, leather etc. And not for food and drink.
Examples of research; Rats and mice are given dye through food. The result of the above experiments is that both animals have a lifoma.
        
In addition to the above-mentioned, there are also natural dyes, for example caramel color (from caramelized sugar, used for cola drinks and cosmetics), annatto (reddish yellow dye derived from Achiote seeds), green dye from chlorella algae, cochineal (Red dye from Dactylopius coccus insects), turmeric, paprika, and elderberry.
        
The FD & C symbol means that the FDA (the Food and Drug Administration) has approved the use of the corresponding dyestuffs in foods, medicines, and cosmetics. While the symbol E, as in the dye E143, means that the dye has been approved for use in the EU region.
        
Natural dyes are safer to use. Therefore its use is highly recommended.
        
Synthetic / artificial colors have a relatively harmful effect, especially in children. This can be proved by research in the United States which shows that there is an increase in the academic value of students and the decline of disciplinary problems after synthetic foodstuffs, including synthetic dyes, are removed from their diet.
                                                                                                               
5. Monosodium Glutamate (MSG)
            
Monosodium glutamate (MSG) or vetsin is a seasoning dish and is very popular among housewives, rice stalls and restaurants. Almost every type of food today from snacks to kids like chiki and the like, noodles meatballs, chinese cuisine to traditional foods sour vegetables, lodeh and even some dishes have been spiked MSG or MSG.
        
Some reports suggest that people who eat at Chinese restaurants, after coming home have allergic symptoms as follows: at first feel the tingling in the back and neck, the lower part of the mandible, arms and back of the arms become hot, as well as other symptoms such as Face sweating, chest tightness and headache due to excessive consumption of MSG. These symptoms were first discovered by a Chinese physician named Ho Man Kwok in 1968 on the appearance of certain symptoms after about 20 to 30 minutes of consuming a meal at a Chinese restaurant.
        
The FDA's advisory committee on the hypersensitivity to food constituents field reported two things about the symptoms of CRS: MSG was suspected of causing CRS and at the time it was found that it was supposed to be the main cause of the onset of CRS symptoms .
Conclusions The FDA Advisory Committee on the study of MSG has no potential to threaten public health but the hypersensitivity or allergic reaction caused by consuming MSG can indeed occur in a small number of communities. The MSG threshold for humans is 2 to 3 g, and with doses greater than 5 g the allergy symptoms (CRS) will appear with a 30 percent chance.
       
The use of MSG in some types of baby food that is marketed in the form of fine pulp, known as baby foods is actually done just to entice consumers (mothers) by delicious flavor. While the effect on food, vetsin will not increase nutrition and appetite for the baby because the baby is not so concerned by the taste.
Examples of experiments;
        
In hewaan, MSG can cause degeneration and necrotizing neuron cells, degeneration and necrosis of the inner retinal nerve cells, leading to cell mutations, resulting in colon and liver cancer, kidney cancer, brain cancer and damage of fat tissue.

6. Formalin
A. Formalin Definition
        
Formalin is a colorless solution and has a very pungent smell. Inside formalin contained about 37 percent formaldehyde in water. Usually methanol is added up to 15 percent as a preservative. Formalin is known as a pest killer (disinfectant) and widely used in industry.
        
Other names Formaldeh, Methylene aldehyde, Paraforin, Morbicid, Oxomethane, Polyoxymethylene glycols, Methanal, Formoform, Superlysoform, Formic aldehyde, Formalith, Tetraoxymethylene, Methyl oxide, Karsan, Trioxane, Oxymethylene, Methylene glycol.
        
The use of formalin as a germ killer so it is used for cleaning: floors, boats, warehouses and clothing. Flyer and other insects Made of artificial silk, dyes, glass mirrors and explosives.
        
Based on the results of investigations and laboratory tests conducted by the Indonesian Food and Drug Supervisory Center (POM) in Jakarta, found a number of food products such as salted fish, wet noodles, and tofu who use formalin as a preservative. Formalin food products are sold in a number of markets and supermarkets in the DKI Jakarta, Banten, Bogor, and Bekasi. The presence of additives and dangerous preservatives in these foods has long been a public secret. But the classic problem is again a hot conversation later this year due to the findings of Balai POM. This fact is more aware to the public that there is a danger of formalin that threatens the health that comes from the consumption of daily food (Judarwanto: 2006).
       
Formalin is a commercial solution with a concentration of 10-40% of formaldehyde. This material is usually used as an antiseptic, germicide, and preservative. Formalin, Methylene aldehyde, Paraforin, Morbicid, Oxomethane, Polyoxymethylene glycols, Methanal, Formoform, Superlysoform, Formic aldehyde, Formalith, Tetraoxymethylene, Methyl oxide, Karsan, Trioxane, Oxymethylene and Methylene glycol. In the market, formalin can be found in diluted form, with formaldehyde content of 10-40 percent.

B. Formalin on Food
       
Formalin is used as one substance to preserve food, so the food will last longer. Actually the use of formaldehyde has long been added in food, but the actions of POM agencies are less assertive in taking wisdom.
        
Many foods containing formalin are circulating in the community. The news is certainly not a figment. The Food and Drug Supervisory Agency (BPOM) has just launched its research results. Of the 700 samples of food products taken from Java, South Sulawesi and Lampung, 56 percent of them contain formaldehyde. Even 70 percent of wet noodles are preserved with formaldehyde. Research conducted by Balai Besar POM DKI Jakarta also mentioned, eight brands of noodles and tofu are marketed in Jakarta contains formalin. BPOM Makasar found dried salted fish in supermarkets and traditional proved to contain formalin as well. Even suspected, fresh fish from the catchment off the coast of Makassar Strait or from the surrounding area also contains formalin for preservatives. In addition to formalin, there are also fishermen who often use detergents (raw material soap maker). For most people, formalin is a common ingredient used for preservative corpses (media indonesia 2009).
        
Substances that actually have many other names based on these compounds have a compound compound CH2OH reactive and easy to bind water. When this substance is mixed with water then he is called formaldehyde. This preservative has an aldehyde element that is easy to react with proteins, so when splashed into foods such as tofu, formalin will bind protein elements from the tofu surface to continue to sink into the interior.
        
With the death of proteins after being bound to the chemical elements of formalin then when suppressed tofu feels more supple. In addition, dead proteins will not be attacked by decomposing bacteria that produce acidic compounds, which is why tofu or other foods become more durable.
        
Formaldehyde kills bacteria by making tissues in dehydrated bacteria (lack of water), so the bacterial cell will dry and form a new layer on the surface. That is, formalin not only kill the bacteria, but also form a new layer that protects the layer below, in order to resist against other bacteria attack. When other disinfectants deactivate bacterial attacks by killing and not reacting with the protected material, formaldehyde reacts chemically and remains in the material to protect from subsequent attacks.
Dangers to the Body
        If formalin is swallowed the mouth, throat and stomach burns, nausea, vomiting and diarrhea, possibly bleeding, severe abdominal pain, headache, hypotension (low blood pressure), seizures, unconsciousness to coma. It can also occur liver, heart, brain, spleen, pancreas, central nervous system and kidney damage.
        If formalin is inhaled in the long term it will cause headaches, respiratory problems, coughs, inflammation of the mucous membranes of the nose, nausea, drowsiness, injuries to the kidneys and the sensitivity of the lungs.
        A new formaldehyde content will pose a danger if inhaled by the respirator. If only digestible digestion tool, will not pose a negative risk. "The use of formalin is only detrimental to the breeders, when they inhale formaldehyde through respiratory equipment, potentially leading to lung cancer (Yuswanto 2003: 26)."

Friday, April 28, 2017

Using english to give evidence of chemical in everyday life



Evidences of Chemical Reactions

All chemical bonds posses potential energy.  In a chemical reaction this energy is changed when old bonds are broken and new bonds are formed. Chemical changes are different from physical changes.  When a physical change occurs there is no breaking and forming of bonds.  There are certain things that will help us identify if a chemical reaction has taken place.  We call these evidences of chemical reactions.
  1. Light is given off: Potential energy in valance electrons is released in the form of light.
  2. Gas is given off: Indicates an increase in kinetic energy of the atom (compound) as it is changed to a gas.
  3. Temperature change: Exothermic is an increase in the speed of the molecules (heat). Exothermic is the taking in of energy.
  4. Color change: the increase or decrease of potential energy stored in new bonds.
  5. Precipitate formed: increase or decrease of potential energy in new bonds formed.
  6. Electrical potential: The release of chemical bond energies to cause the movement of  valence electrons.

All chemical reactions, whether simple or complex, involve changes in substances. One or more starting substances, the reactants, are changed into one or more new substances, the products.

Reactants ---- Products
In a chemical reaction the ways in which atoms are joined together are changed. Bonds are broken and new bonds are formed as reactants are converted into products. The atoms are not created or destroyed. They are just rearranged.
Chemical reactions can be described in different ways. For example, we could say: "Iron reacts with oxygen to produce iron (III) oxide (rust)." Alternatively, we could identify the reactants and product in this reaction by writing a word equation.
Iron + oxygen ---- iron (III) oxide
In a word equation, the reactants are written on the left, and the products are written on the right. They are connected by an arrow ( ---- ) that is read as "yields" or "reacts to produce." Word equations communicate the reaction but can get cumbersome. To be more efficient chemists use chemical formulas for writing equations. For example the rusting of iron would be represented as follows:
Fe + O2 ---- Fe2O3.



There are chemical reactions in everyday life such as, in the way you breathe the food you eat, the water you drink and in every motion that goes around you at every second of the day. This is a very important and interesting concept that can be taught to your children because they have to know how their world works. The best way to explain this to them is to show them practically how and why some things in nature in their way! You can do this by showing a child some chemical experiments for them. A chemistry in the essay of everyday life can be a good start to teach these children, how beautiful, chemistry. Find out what this intelligent nature mechanism, which determines the chemistry in everyday life.

  • • Water, which occupies 70% of the earth's surface is made up of two chemical elements,
          Hydrogen and oxygen.
    • Soap is an emulsifier that allows oil and water to mix and so the oily mixture on the body and clothing can be removed after application of soap and water.
    • Chemistry in everyday life for children can also include why colored vegetables. Colored vegetables consist of chemical compounds called carotenoids that have an area known as the chromophore. It absorbs certain wavelengths of light and thus there are colorful vegetables.
    • Food is cooked because the steam is present either in added water or those that are present in the food.
    • Onions make you cry because of the presence of sulfur in a resting cell after the onions are cut off. This sulfur will mix with water and thus irritate your eyes.
    • You feel hungry because the satiety center in your brain falls short of certain hormones to function and then sends out hunger signals.
    • You fall in love, get attracted and have a sense of belonging because certain monoamines are present in your brain that can be stimulated through a nerve sensor.
    • If you are wondering why the sky is blue, it is because of a phenomenon called "Rayleigh scattering", which depends on the scattering of light through particles much smaller than the wavelength. Therefore when passing through the light through the gas, there is scattering and the sky looks blue.
    • Coffee keeps you awake because of the presence of a chemical called adenosine, in your brain. It binds to certain receptors and slows the activity of nerve cells while sleep is characterized.
    • Anaerobic fermentation is also a great concept that is present in the chemistry of everyday life. It is present in yogurt, bread, cakes and many other cake products. This is a multiplication of certain beneficial bacteria that increases the size of the food and makes it more filling and soft.
    • The food chain present in every ecosystem is also a major part of the chemistry in everyday life. Despite having a biological background, it finally works because of his chemistry. 

  other evidence in around :

1. Photosynthesis
 

Scheme of photosynthesis in plants. The resulting carbohydrates are stored in or used by plants. Source: wikipedia.org
Photosynthesis is a process used by plants and other organisms to convert light energy, usually from the Sun, into a chemical energy that can then be liberated to fuel organism activity. This chemical energy is stored in carbohydrate molecules, such as sugars, which are synthesized from carbon dioxide and water. In most cases, oxygen is also produced as a waste product. Most plants, mostly algae, and cyanobacteria do photosynthesis, and these organisms are called photoautotrophs. Photosynthesis maintains atmospheric oxygen levels and supplies all organic compounds and most of the energy needed for life on Earth.
Briefly, plants use a chemical reaction called photosynthesis to convert carbon dioxide and water into food (glucose) and oxygen. It is one of the most common daily chemical reactions and also one of the most important, because this is how plants produce food for themselves and animals and convert carbon dioxide into oxygen.
6 CO2 + 6 H2O + light → C6H12O6 + 6 O2.

Benefits of Chemistry

Branch of Chemistry
Before really knowing the benefits of chemistry for life, it's good if we know chemistry further. Chemistry is divided into several parts, the parts will have and represent the benefits of different chemistry in each branch. The branch of chemistry among them is,

Organic Chemistry. This field focuses the study on research on organic compounds (hydrocarbon compounds), such as alcohol, gasoline, diesel, and others.

Inorganic Chemicals. This field focuses on studies on the study of inorganic compounds such as salts, minerals, and others.

Biochemistry. This field deals with the biological sciences, especially regarding the nature and composition of the compound and the result of its change reaction. The compounds studied include carbohydrates, proteins, fats, vitamins, enzymes, hormones, and others.

Analytical Chemistry. This field deals with the determination of qualitative and quantitative chemistry, which is more directed to the development and application of increasingly sophisticated analytic equipment.

Chemical environment. This field focuses on studies on environmental issues such as pollution, waste or waste handling, clean water handling, and others.

Core Chemistry (Radiochemistry). This field focuses on studies on radioactive materials, handling and utilization such as for medicine (medicine), agriculture and hydrology.

Pharmaceutical Chemicals. This field focuses on studies on separation (isolation), manufacture (synthesis), and development of natural materials containing active substances for medicine.

Physical Chemistry. This field deals with physics, thus focusing on studies on the energy that accompanies chemical reactions, physical properties of chemistry, and changes in chemical compounds.

Food Chemistry. This field focuses on research studies to improve the quality of food, food additives, and matters related to food needs.

Benefits of Chemistry for Various Fields
Chemistry has an important position and is required by other fields of science. Some of the actual benefits that it is the benefits of chemistry in human life are not even so conscious. Here are some of the benefits of chemistry in human life that can not be replaced by other science.
1. Field of Medicine
The first benefits of chemistry in human life are in the field of medicine. To assist the healing of patients with an illness, medicines are made based on the results of research into the process and chemical reactions of nutritious substances carried out in the pharmaceutical chemical branch.
2. Agriculture Sector
Maybe you are confused, what is the relationship between chemistry and the field of agriculture, then what Benefits of chemistry For agriculture? Well, is not it to restore soil fertility, it is necessary to add the fertilizer, while the pest can be overcome with the addition of pesticide. The benefits and dangers of the use of fertilizers and pesticides should be understood so as to avoid errors in their use. The thing to remember is fertilizer And pesticides are the "products" of chemistry.
 
3. Field of Geology
This field deals with the research of rocks (minerals) and gas and petroleum mining. The process of determining the elements that make up the mineral and the preliminary stage for exploration, using the basics of chemistry. The benefits of chemistry in this field to help understand and understand the findings of researchers about
Rocks or "object-Objects "of nature.

4. Field of Biology
This field specifically learns about living things (animals and plants). Chemical processes that take place in living things include digestion of food, breathing, metabolism, fermentation, photosynthesis and others. To learn this, knowledge of the structure and properties of existing compounds, such as carbohydrates, proteins, vitamins, enzymes, fats, nucleic acids and so on. Although in general, this field is more closely related to the science of biology, but the benefits of chemistry also in fact a little more influential in the field of biology.

5. Field of Law
 You are confused what is the relation of the field of law to chemistry? The field of law directly does not have any connection with chemistry, but the benefits of chemistry in this field of law can be felt when the enactment of examination equipment buktikriminalitas (kriminologi). The body part of the suspect can be examined by examining its DNA structure because each person's DNA structure is different. This examination involves chemistry.

6. Machine Field
Benefits Chemistry can also concern the field of machinery that is studying the properties and composition of a good metal for the manufacture of machinery, study the nature, composition of fuel and engine oil.
a.t.c.

reaction in our body :
Metabolism In The Body
Cells are the smallest unit of life, therefore cells can carry on life activities, including metabolism. Metabolism is the chemical processes that occur in the body of a living thing / cell. Metabolism is also called enzymatic reaction, because metabolism always occurs using enzyme catalyst. Cells are the smallest unit of life, therefore cells can carry on life activities, including metabolism. Metabolism is the chemical processes that occur in the body of a living thing / cell. Metabolism is also called enzymatic reaction, because metabolism always occurs using enzyme catalyst.Based on the process metabolism is divided into 2, namely:1. Anabolism / AsimilasI / Synthesis,Namely the complex molecular binding process using high energy. Example: photosynthesis (assimilation C)
                           
Light energy6 CO2 + 6 H2O -----------> C6H1206 + 6 02
             
Chlorophyll glucose (chemical energy)In chloroplast there is transformation of energy, that is from light energy as kinetic energy turns into chemical energy as potential energy, in the form of bond of organic compound on glucose. With the help of enzymes, the process is fast and efficient. When in a reaction requires energy in the form of heat reaction is called an endergonic reaction. Such a reaction is called an endothermic reaction.2. Catabolism (Assimilated),Namely the process of decomposition of substances to liberate chemical energy stored in the organic compound.Example:enzymeC6H12O6 + 6 O2 -----------> 6 CO2 + 6 H2O + 686 KKal.
                                                                            
Chemical energyAs the molecules break down into smaller molecules, the release of energy creates heat energy. When a reaction is released by energy, its reaction is called an exergonic reaction. Such reactions are called exothermic reactions.

oke, there are topic about evidence chemical in our life. i hope can make we trust. thanks for come to my blog. 

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