The chemical properties are the characteristics of a substance that states whether the substance can undergo certain chemical changes. The chemical changes are changes that alter the identity of the substance in a, material. In a chemical change to form new substances. The occurrence of a chemical reaction can be known from the change caused by the reaction. Some of these changes is the formation of deposits, discoloration, the formation of gas, and the temperature changes.
1.
Generate Deposition Chemical Reactions
Around
us many common chemical reactions to produce a precipitate. Reactions included
examples of chemical reactions that produce sediment, among others:
•
The occurrence of carbonate compounds in the bottom of the pot when boiling
water.
•
When lime is blown, there will be a reaction between the lime with carbon
dioxide respiratory outcomes. The reaction can be observed the formation of
calcium carbonate (CaCO3), white sediment in the bottom of the glass if left
for some time.
•
Precipitation by chemical reactions has long been used for the water
purification process. Water wells are cloudy due to mud can be clarified by the
addition of alum. The alum will bind the particles to agglomerate and
eventually sludge settles.
2.
Produce Gas Chemical Reactions
In
everyday life, we encounter many chemical reactions characterized with gas
formation. When carbide mixed with water, will produce acetylene. This gas is
generally used for the purposes of connecting the metal by welding. In addition
acetylene can also be used to accelerate the ripening of fruit. When making a
cake, the batter into the baking soda is added. At the time of the heated
dough, baking soda decomposes produce carbon dioxide gas. This gas causes the
cake to rise.
3.
Produce Chemical Reaction Temperature Changes
Firecracker
explosion was the result of a chemical reaction. All reactions are always
involves energy, energy-absorbing reactions and no release energy. The energy
that accompanies a chemical reaction in the form of heat, light, sound, or
electrical energy. A chemical reactions that produce energy called exothermic
reactions. If the energy in the form of heat, can find out by measuring the
temperature rise. The combustion reaction is an example of an exothermic
reaction. At the time of the reaction of calcium carbide with water, kitadapat
feel the rise the temperature on the glass wall where the reaction is
conducted. Large increase in temperature may measured with a thermometer. A
chemical reactions that require energy called endothermic reactions. For
example, the reaction in the process of photosynthesis.
4.
Produce Chemical Reaction Color Change
Apples
are cut and left for some time, over time will change to brown. This color
change indicates that the chemical substances in apples have reacted with
oxygen in the air. The reaction between the solution of starch with iodine
tintur can be seen from the color change. Colored clear starch solution, brown
iodine. If the two are mixed to form a blue color. If the added vitamin C,
iodine reacts with vitamin C to form other chemicals that are colorless. Thus
chemical reactions can be seen from the color change. Household appliances made
of metal, these objects will gradually change color. Tools of the iron will
rust to a black, a tool of copper will change color to green, the tools of
silver will turn black. The color change indicates that there has been a
chemical reaction in such tools. The clothes we wear color will eventually fade
because it reacts with the chemicals contained in detergents.
hi inggi i want to ask you about If harmful chemicals are exposed to the skin what causes it?
BalasHapusHazardous chemicals can be grouped as follows (Imam Khasani, 1983)
Hapus1. Explosive (explosive) example: potassium chlorate, Trinitrotaluen (TNT), sodium nitrate, high pressure gas, sulfur mixture, carbon and potassium chlorate
2. Flamable (eg flammable) methanol, ether, acetone, hexane, benzene, this vapor can move toward fire as far as 3 meters
3. Oxidazing Agent (oxidizing agent) for example: sodium nitrite / nitrate, potassium chlorate, chlorine, nitric acid, alkene, alkylbenzene and so on. Although no O2 from the outside can cause a fire.
4. Combustible material by water, for example metal N a, K and concentrated sulfuric acid.
5. Combustible materials by acids eg alloys N a and K, hydride compounds and the like.
6. High pressure gas, eg gases in cylinders with high pressure.
7. Toxic materials for example: C02, CI2, benzene, chloroform, cyanide and so on 8. Corrosive materials for example: acid anhydride, alkali, sulfuric acid, phenol and so on.
Try to explain how long-term and short-term effects of chemical reactions
BalasHapuslong term: Loss of appetite
HapusIncreased heart rate, blood pressure and body temperature
Pupil enlarged eyes
Disturbed sleep patterns
Nausea
Being strange, unexpected, sometimes acting violently or cruelly
Hallucinations, excessive joy, irritability
Panic and psychosis
Excessive doses can result in seizures and death
short term:
Is not present in this short-term chemical reaction, as it will have a prolonged impac
What are the characteristics of a reaction?
BalasHapusChemical Reaction Has 4 Characteristic Namely As follows ...
Hapus1. Chemical reactions that produce precipitate
2. Chemical Reactions that cause Color Changes
3. Chemical Reactions that Produce Gas
4. Chemical Reactions Resulting in Temperature Changes
Give two examples of the gas-generating reaction, other than the one you mentioned.
BalasHapus1.2H₂O₂ --> O₂ (gas) + 2H₂O (l)
Hapus2.CH₄+2O₂ --> CO₂ (gas) + 2H₂O (gas)
Please you explain about change color of chemical reaction ?
HapusProduce Chemical Reaction Color Change as Apples are cut and left for some time, over time will change to brown. This color change indicates that the chemical substances in apples have reacted with oxygen in the air. The reaction between the solution of starch with iodine tintur can be seen from the color change. Colored clear starch solution, brown iodine. If the two are mixed to form a blue color.
Hapus