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Numbers that describe the energies of electrons in atoms, derived from quantum mechanical treatment.

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Pairing Energy

Energy required to pair two electrons in the same orbital.

Alkenes (Olefins)

Unsaturated hydrocarbons that contain one or more carbon-carbon double bonds.

Barometer

A device for measuring pressure.

Melting Point

The temperature at which liquid and solid coexist in equilibrium, also the freezing point.

Double Bond

Covalent bond resulting from the sharing of four electrons (two pairs) between two atoms.

Dipole Moment

The product of the distance separating opposite charges of equal magnitude of the charge, a measure of the polarity of a bond or molecule, a measured dipole moment refers to the dipole moment of an entire molecule.

Optical Activity

The rotation of plane polarized light by one of a pair of optical isomers.

 

Two chemistry egg tricks

The French have a saying: "You cannot cook an omelet without breaking eggs."Chemists hearing this proverb totally disagree. There is nothing easier than cleaning an egg without breaking its shell.
Probably our readers have already guessed how to do this, as it’s known that the hard shell of the egg is carbon dioxide, like chalk and marble.

Polarimeter

A device used to measure optical activity.

Octet Rule

Many representative elements attain at least a share of eight electrons in their valence shells when they form molecular or ionic compounds, there are some limitations.