A chemical reaction is a process in which one or more substances, known as reactants, are transformed into one or more different substances, known as products. During a chemical reaction, bonds between atoms are broken and new bonds are formed, resulting in the rearrangement of atoms to create new compounds or molecules.
Key characteristics of chemical reactions include:
1. **Reactants and Products:** Chemical reactions involve the transformation of reactants into products. Reactants are the starting substances, and products are the substances formed as a result of the reaction.
2. **Chemical Equations:** Chemical reactions are often represented by chemical equations, which provide a symbolic representation of the reactants, products, and the stoichiometry of the reaction. The Law of Conservation of Mass is observed in chemical equations, meaning that the total mass of the reactants is equal to the total mass of the products.
3. **Energy Changes:** Chemical reactions can be accompanied by changes in energy. Some reactions release energy (exothermic), while others absorb energy (endothermic). The energy changes are often manifested as changes in temperature, light emission, or other observable effects.
4. **Reaction Rates:** Chemical reactions can occur at different rates. Factors such as temperature, concentration of reactants, and the presence of catalysts can influence the speed at which a reaction takes place.
5. **Chemical Bonds:** Breaking and forming of chemical bonds are central to chemical reactions. Breaking bonds in the reactants requires an input of energy, while the formation of new bonds in the products releases energy.
Chemical reactions are essential to the study of chemistry, as they underlie all chemical processes in the universe. Understanding and manipulating chemical reactions have wide-ranging applications in various fields, including medicine, industry, and environmental science.
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A chemical reaction is a process where substances (reactants) transform into new substances (products) with different properties.
Answer:
A chemical reaction is a process in which one or more substances, known as reactants, are transformed into one or more different substances, known as products. During a chemical reaction, bonds between atoms are broken and new bonds are formed, resulting in the rearrangement of atoms to create new compounds or molecules.
Key characteristics of chemical reactions include:
1. **Reactants and Products:** Chemical reactions involve the transformation of reactants into products. Reactants are the starting substances, and products are the substances formed as a result of the reaction.
2. **Chemical Equations:** Chemical reactions are often represented by chemical equations, which provide a symbolic representation of the reactants, products, and the stoichiometry of the reaction. The Law of Conservation of Mass is observed in chemical equations, meaning that the total mass of the reactants is equal to the total mass of the products.
3. **Energy Changes:** Chemical reactions can be accompanied by changes in energy. Some reactions release energy (exothermic), while others absorb energy (endothermic). The energy changes are often manifested as changes in temperature, light emission, or other observable effects.
4. **Reaction Rates:** Chemical reactions can occur at different rates. Factors such as temperature, concentration of reactants, and the presence of catalysts can influence the speed at which a reaction takes place.
5. **Chemical Bonds:** Breaking and forming of chemical bonds are central to chemical reactions. Breaking bonds in the reactants requires an input of energy, while the formation of new bonds in the products releases energy.
Chemical reactions are essential to the study of chemistry, as they underlie all chemical processes in the universe. Understanding and manipulating chemical reactions have wide-ranging applications in various fields, including medicine, industry, and environmental science.