Thermodynamics and Chemical Kinetics

All chemical reactions involve the breaking and forming of bonds, which inherently requires or releases energy, leading to a change in the energy state of the system.

Chemical reactions are categorized by their energy profile; some release energy (exothermic) while others absorb energy (endothermic).

The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.

Chemical energy is stored in the bonds of chemical compounds and is released during chemical reactions, such as in batteries or burning fuel.

Enzymes have an optimal temperature range in which they function. For most human enzymes, temperatures above 40 degrees Celsius disrupt the weak chemical bonds stabilizing their tertiary structure, causing them to denature and lose function.

A negative change in Gibbs free energy (delta G < 0) indicates that a chemical reaction is exergonic and thermodynamically spontaneous, meaning it can occur without the input of additional energy.

In a chemical reaction, atoms are conserved but their chemical bonds are broken and formed, causing them to rearrange and group together differently to form new substances.

An endothermic reaction is a chemical reaction that absorbs heat energy from its surroundings. This absorption of heat typically causes the temperature of the immediate surroundings to drop. Exothermic reactions, by contrast, release heat into the surroundings.

The law of conservation of energy states that the total energy of an isolated system remains constant. Energy cannot be created or destroyed, but it can be transformed from one form, such as potential energy, to another, such as kinetic energy.

Higher water concentration means more free water molecules, which increases both the kinetic energy of the water and the water potential of the system.

Heating a reaction increases the kinetic energy of the particles, causing them to collide more frequently and with greater force. This increased collision rate accelerates the chemical reaction.

Chemical changes involve the formation of new substances by breaking and forming chemical bonds. These processes are generally not easily reversible, unlike physical changes.

A physical change alters the form or appearance of a substance but does not change its chemical composition, meaning no new products are created. Chemical changes, conversely, result in the formation of new substances.

Endothermic reactions absorb energy from their environment. Exothermic reactions release energy.

A chemical reaction is defined by the transformation of reactants into new substances with different chemical properties. Physical changes do not create new substances.