chemical reactions that release energy often occur spontanously. Chemical reactions that absorb energy will not occur without a source of energy.
Some reactions absorb energy, some release energy.
How ... There is energy associated with every bond holding the atoms together in a molecule. It takes some energy to break these old bonds and allow new bonds to form. If the new bonds require less energy to hold the atoms in the new molecule then the extra energy is released.
Think of a piece of paper. It just sits there until some small spark (like a match)starts a fire. The end of the paper starts to break down and allows oxygen from the air to combine forming Carbon dioxide along with other molecules. Carbon dioxide uses less energy to hold the atoms together and the extra energy heats up more paper so the fire spreads through the piece of paper. Some extra energy is used to keep the fire going, and some is released to the air.
Chemical reactions involve changes in the arrangement of electrons in atoms and molecules. All atomic nuclei have positive charges and accordingly attract electrons, but some nuclei attract electrons more strongly than others, and when an electron moves from one atom to another, or alters its orbital pattern in some way, to be closer to some nucleus and farther from some other nucleus, there is a corresponding change in energy.
You can experience exothermic reactions where energy is RELEASED from the reaction into the surroundings, OR endothermic reactions where energy is CONSUMED by the reaction from the surroundings.
Chemical reaction is another word for chemical change. Energy can be absorbed and stored for later while burning releases the stored energy.
because the reactants are consumed and new products are formed? if you dont understand that question then you probaly wont undertsand an answer so go read something on chemistry.
In an energy change, energy changes from chemical energy to heat energy. *THIS ALSO HAPPENS IN SEXUAL REPRODUCTION.*
Generally the rate of a reaction is higher when the temperature increase.
A change that releases energy in the form of heat to its environment.
They have excellent chemical high resistance. They also have better resistance to temperature changes.
There are several ways to detect chemical changes in a substance. 1. Change in color (usually) 2. Bubbles fizz from substance (gas is produced) 3. Change in temperature (surrounding temperature in air DOES NOT influence change in substance's temperature) 4.
Chemical changes can be identified by 1. Color change 2. Fizzing 3. Temperature changes 4. Odor changes 5. Change in the state of matter (solid, liquid, gas)
Physical, because it doesn't change chemical make up it just changes the appearance and texture
Almost all chemical changes release or take in energy, and thus do result in changes in temperature.
No.
A temperature change can be seen both in physical and chemical changes.
Burning wood is a chemical change because it involves a chemical reaction between the wood and oxygen, resulting in the formation of new substances like carbon dioxide and water vapor.
A change that releases energy in the form of heat to its environment.
Pressure Temperature Changes in the molecular structure(chemical change)
Metamorphism involves temperature and high pressure and chemical changes. The high pressure, chemical changes and temperature are the metamorphism that act on a rock that makes it change.
A chemical change produces a form of matter that was not there before. Evidence of a chemical change could be changes in temperature, color, smell, and the production of a gas or a precipitate.
A chemical change is when the chemical properties of a substance changes and a physical change is when the chemical properties stay the same but the physical properties (shape, temperature etc...)
They have excellent chemical high resistance. They also have better resistance to temperature changes.
They have excellent chemical high resistance. They also have better resistance to temperature changes.
Substances with covalent bonds are more sensible to temperature changes.