0
In a chemical reaction, molecules are formed or changed, like wood changing into carbon dioxide and ash when burned. Carbon dioxide is formed from the combination of the carbon in the wood fibers and the oxygen in the air. Other components of the wood are changed to a mixture of compounds we call ash.
The molecular structure is changed by the making or the breaking of the bonds between atoms. This changing of the rearrangement of the individual atoms constitutes the chemical reaction. Relatively small amounts of energy may be consumed or released in the reaction process. Burning wood releases heat energy while other chemical reactions may require heat, or energy input, in order to proceed. For example, some of the compounds in wood ashes were produced by the heat of the fire which supplied the energy input to foster the reaction. Reactions that produce heat are called exothermic and those that require heat are called endothermic. Burning wood results in both types of reactions acuring at once.
A physical reaction occurs when atoms themselves combine or split to produce different atoms. These different atoms are actually different elements from the original atoms which were split or combined. Physical reactions of atoms generally produce large amounts of energy such as that released in a nuclear explosion. This happens because the total mass of the reacting elements does not equal the mass of the new elements produced, thus the remaining mass is converted directly to energy in the form of radiation. This radiation is in the form of heat, light, x-rays etc.
What else can I help you with?
What are the key differences in chemical composition and reactions between the substances involved in delta chemistry?
In delta chemistry, the key differences in chemical composition and reactions between the substances involved are based on their molecular structures and bonding arrangements. These differences influence how the substances interact and react with each other, leading to unique chemical properties and behaviors.
What are the differences between physical and chemical changes?
Physical changes involve a change in appearance or state of matter without altering the chemical composition, while chemical changes result in the formation of new substances with different chemical properties.
What are the key differences between chemical physics and physical chemistry, and how do these disciplines intersect in the study of matter and energy interactions?
Chemical physics focuses on the physical properties and behavior of molecules and atoms, while physical chemistry studies the chemical processes and reactions that occur at the molecular level. These disciplines intersect in the study of matter and energy interactions by combining principles of physics and chemistry to understand how molecules interact and transform in various environments.
What are the differences between drying and dehydration in chemistry?
Drying typically refers to the removal of moisture or water from a substance, while dehydration specifically refers to the removal of water molecules from a larger molecule. Drying can involve physical methods like evaporation, whereas dehydration often involves chemical reactions such as elimination reactions.
Is the reaction between aluminum and copper chloride a physical or chemical change?
The reaction between aluminum and copper chloride is a chemical change. During the reaction, a chemical reaction occurs resulting in the formation of new substances with different properties than the original reactants. This is different from a physical change where substances maintain their original properties.
What are some similarities and differences between physical and chemical weathering?
Similarities: Both processes result in the breakdown of rocks and minerals. Both can occur through natural processes like temperature changes, water, and biological activity. Differences: Physical weathering involves the physical breakdown of rocks into smaller pieces without changing their chemical composition, while chemical weathering alters the chemical composition of rocks through reactions with substances like water or acids. Physical weathering does not involve chemical reactions, while chemical weathering does.
What is difference between chemical and physical in acid reactions?
it can bereversible and
Differences between chemical and physical change?
A chemical change results in a change in chemical composition, while a physical change does not.
What are differences between physical and chemical weathering?
physical: water, wind, and temperature chemical: acid rain and rust
What is the differences between physical and chemical change in tabular form?
physical change are reversable
What are the key differences in chemical composition and reactions between the substances involved in delta chemistry?
In delta chemistry, the key differences in chemical composition and reactions between the substances involved are based on their molecular structures and bonding arrangements. These differences influence how the substances interact and react with each other, leading to unique chemical properties and behaviors.
What are the different between chemicals and physical reactions?
chemical effects it more than pie does
What are the differences between physical and chemical weathering and say what type acid rain is?
Physical weathering involves the breakdown of rocks into smaller pieces without changing their chemical composition, while chemical weathering involves the alteration of rocks through chemical reactions. Acid rain is a form of chemical weathering, as it can react with rocks and minerals to degrade them.
What the differences between physical weathering and surface waters?
physical weathering is weathering that you can reverse and chemical weathering is where you can' reverse it.
What is the differences between physical and chemical changes in relation to fire services?
Physical changes are melting and boiling in this case; fire is a combustion, a chemical change.
Is a reaction with air a physical property?
Any reaction involved between atoms are chemical reactions.
Which statement describes the differences between chemical reactions and nuclear decay rates?
Nuclear decay rates vary, but chemical reaction rates are constant
