Cause And Efect Of Chemichal Reaction
Cause
And Efect Of Chemichal Reaction
A. Understanding
Chemical changes are changes in substances that produce new substances.
For example: the paper before being burned has properties different from the
paper before being burned. Examples of chemical changes are rice rot, stale
milk, stale vegetables, rotting eggs, salted eggs, rusted iron, etc.
B. The characteristics of chemical changes
1. The formation of new types of substances
2. Substances that change can not return to
their original shape
3. Followed by changes in chemical
properties through chemical reactions
During chemical mass changes the substance
before the reaction is equal to the mass of the substance after the reaction.
C. The causes of chemical changes
1.Can occur due to combustion
One of the chemical changes that we often
see in everyday life is combustion events. Do you know what burning is? Burning
is a chemical reaction between matter burning with oxygen. Therefore, the
combustion reaction is often called the oxidation reaction. Events of forest
fires merupkertasakan one example of chemical changes due to combustion.
Another example is firework burning. Combustion reactions are widely used as an
energy source. For example, burning gasoline in a car's engine can generate
motion energy so the car can move. Events of chemical changes due to burning
also occur in your body. The food you eat has been processed in the body by
burning to produce energy that can be used to perform daily activities.
Why in the burning process can smoke occur?
Smoke occurs due to incomplete combustion.
Incomplete combustion occurs because the oxygen available to react is
insufficient so that some of the carbon does not burn. Incomplete combustion
can produce toxic gas, carbon monoxide (CO).
2. Can occur due to mixing of substances
Chemical changes can also occur due to the
mixing of two or more substances that produce new substances.
. Example:
The standard
reaction enthalpy for combustion of methane at 298.15 K and 1 atm is -802 kJ /
mol.
Another example:
A simpler example
can be observed in combustion of hydrogen and oxygen, which is a common
reaction used in rocket engines, which produce only water vapor, with a
standard enthalpy reaction at 298.15 K and 1 atm being -242 kJ / mol.
3. Can occur due to the flow of electricity
Chemical changes can occur due to the flow
of electricity. For example when recharging vehicle battery. Electrical flow
causes a chemical reaction in the battery, so the battery can be reused.
What is the negative effect of chemical reaction?
BalasHapusSuch as acid rain which leads to corrosion of iron, burning of paper causing air pollution and many others
HapusWhat changes happen to wood burning?
BalasHapusBurning a piece of wood shows that a chemical reaction is accompanied by a change in energy. When wood is burned, energy is released. Some energy is heat to the environment and part of it is released as light. Substances which, when reacted to produce large quantities of heat, are often used as fuel. Wood, coal, oil, kerosene and natural gas can all be used to generate energy for heating purposes if reacted with oxygen in the air.
HapusHi Safira, Can you give me an example of cause and effect in a chemical reaction, more specifically? For example in daily life. thank you
BalasHapusHi intan, Such as the burning of paper that produces carbon dioxide and water, as well as acid rain which leads to iron filings
Hapuswhat cause combustion?
BalasHapusThe Fator
Hapus1. Flammable materials - Solid, liquid or gaseous materials (wood, paper, textil, gasoline, oil, acetellin etc.),
2. Heat (Temperature) - In the environment has a very high temperature, (heat source from Sunlight, Electricity (kortsluiting, heat energimekanik (friction), Chemical Reaction, Air Compression)
3. Oxygen (O2) - The presence of Acid (O2) is enough. The content (content) O2 is determined by percentage (%), the greater the oxygen level the fire will burn even more, while less than 12% of the oxygen content will not occur in the fire. In normal circumstances the free oxygen content in the air ranges from 21%, then the air has adequate active activity.
Explain the characteristics of chemical changes!
BalasHapusOngoing changes in chemical properties can be identified by the following:
Hapus1. Gas Formation
The chemical reaction is unique, in certain chemical reactions that can form a gas. An example of a chemical reaction that forms a gas is the reaction of magnesium metal (Mg) with hydrochloric acid (HCl).
2. Formation of sediment
The precipitation reaction is a reaction which results in a solid-shaped compound. One example of a reaction that can form a precipitate is between barium chloride (BaCI2) and sodium sulfate (Na2SO24)
3. Color changes occur
One When a chemical reaction takes place, there will be a change in the composition and a new substance will be formed, and will probably have a different color. An example of a chemical reaction that gives a characteristic color is the reaction between copper sulphate (CuSO4) and water (H2O).
4. The occurrence of temperature changes
The chemical changes will be marked by changes in a thermal energy, or a change in heat flow from or to the environment. As a result the temperature of the reaction results will be higher and may be lower than the temperature of the reactor.