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Compounds with different arrangements of groups on either side of a bond with restricted rotation, such as a double bond or a single bond in a ring, for example cis-trans isomers of certain alkenes. Stereoisomers that are not mirror images of each other, also known as position isomers.

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Displacement Reactions

Reactions in which one element displaces another from a compound.

 

Composition Stoichiometry

Descibes the quantitative (mass) relationships among elements in compounds.

Photochemical Smog

A brownish smog occurring in urban areas receiving large amounts of sunlight, caused by photochemical (light-induced) reactions among nitrogen oxides, hydrocarbons and other components of polluted air that produce photochemical oxidants.

 

Electron Configuration

Specific distribution of electrons in atomic orbitals of atoms or ions.

Mechanism

The sequence of steps by which reactants are converted into products.

Substance

Any kind of matter all specimens of which have the same chemical composition and physical properties.

 

Creating Malachite egg

One of the most interesting and obvious chemical experiments is the experiment on the interaction of copper sulfate and calcium carbonate. The latter is contained in the shell of a simple egg, but copper sulphate should be searched in a chemical reagent store. This experience is simple, but effective and visual, and as a result we will get something beautiful.

Lone Pair

Pair of electrons residing on one atom and not shared by other atoms, unshared pair.

Percent Composition

The mass percent of each element in a compound.

Nuclear Reaction

Involves a change in the composition of a nucleus and can evolve or absorb an extraordinarily large amount of energy.