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A helium nucleus.

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Buret

A piece of volumetric glassware, usually graduated in 0.1-mL intervals, that is used to deliver solutions to be used in titrations in a quantitative (dropwise) manner.

Law of Conservation of Energy

Energy cannot be created or destroyed, it may be changed from one form to another.

Periodic Table

An arrangement of elements in order of increasing atomic numbers that also emphasizes periodicity.

Valence Bond Theory

Assumes that covalent bonds are formed when atomic orbitals on different atoms overlap and the electrons are shared.

Enzyme

A protein that acts as a catalyst in biological systems.

Biodegradability

The ability of a substance to be broken down into simpler substances by bacteria.

 

Net Ionic Equation

Equation that results from canceling spectator ions and eliminating brackets from a total ionic equation.

Catalyst

A substance that speeds up a chemical reaction without being consumed itself in the reaction.
A substance that alters (usually increases) the rate at which a reaction occurs.

Hydrate

A solid compound that contains a definite percentage of bound water.

Second Law of Thermodynamics

The universe tends toward a state of greater diorder in spontaneous processes.