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A protein that acts as a catalyst in biological systems.

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Hydration

Reaction of a substance with water.

Nodal Plane

A region in which the probability of finding an electron is zero.

 

Heterogeneous Catalyst

A catalyst that exists in a different phase (solid, liquid or gas) from the reactants, a contact catalyst.

Supersaturated Solution

A solution that contains a higher than saturation concentration of solute, slight disturbance or seeding causes crystallization of excess solute.

Crystal Lattice Energy

Amount of energy that holds a crystal together, the energy change when a mole of solid is formed from its constituent molecules or ions (for ionic compounds) in their gaseous state.

Mixture

A sample of matter composed of two or more substances, each of which retains its identity and properties.

Barometer

A device for measuring pressure.

Disproportionation Reactions

Redox reactions in which the oxidizing agent and the reducing agent are the same species.

Polymorphous

Refers to substances that crystallize in more than one crystalline arrangement.

Condensed States

The solid and liquid states.