Molecules and Extended Structures

chemical bond

The connection between atoms in more complex particles

molecule

a group of two or more atoms that are held together by chemical bonds; a molecule has a unique composition and structure

model

a representation of an object that makes important aspects easier to see

atomic composition

the types of elements that make up a substance, as well the specific ratios of atoms of eack kind of element that make it up

chemical structure

the specific way in which the bonds and atoms are arranged within the molecules of a substance

crystal

a solid structure whose atoms or molecules are arranged in a repeating , three dimension pattern

polymer

a type of extended structure that is mad up of many smaller repeating subunits in a chain

extended structure

a structure whose subunits occur in a constant ratio and are arranged in a repeating pattern

coefficient

a number placed before a chemical formula in a reaction to indicate the number of molecules or atoms involved.

subscript

a number written below and to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.

mixture

a physical combination of two or more substances that retain their individual properties.

homogeneous mixture

a mixture that has a uniform composition and properties throughout, such as saltwater or air.

heterogeneous mixture

a mixture that consists of visibly different substances or phases, such as salad or sand and gravel.

compound

a substance formed when two or more elements chemically bond together, resulting in new properties distinct from the individual elements.

element

A pure substance that cannot be broken down into simpler substances by chemical means, consisting of only one type of atom.