Elements and compunds

Solo disponible en BuenasTareas
  • Páginas : 2 (290 palabras )
  • Descarga(s) : 0
  • Publicado : 12 de octubre de 2010
Leer documento completo
Vista previa del texto
ELEMENTS AND COMPOUNDS
COMPARE
Elements are substances that cannot be separated into simpler substances. Salt is made up of the elements sodium and chloride. Water is made up ofthe elements hydrogen and oxygen. A compound is a substance formed when two or more elements are chemically joined.
Substances are either elements are compounds. Elements aresubstances in their simplest form that cannot be separated further through chemical reactions. Examples of elements are oxygen (O2), carbon (C2), and hydrogen (H2). Compounds arecompositions of two or more elements. Examples or compounds are water (H2O), carbon dioxide (CO2), and sodium chloride - table salt (NaCl).
Compounds are combinations of matter. They aretwo or more elements
whose atoms have chemically combined, or bonded.
When compounds are formed, the properties of the compound are different
from the properties of the elementsthat make up the compound.for example:
Sodium [Na] is an element. It is a bright, silvery metal. It is soft and
reacts very easily. It floats on water. It may catch fire when ittouches
CONTRAST
elements are pure substances in which all of the atoms contain the same number of protons.
compounds are substances which contain 2 or more elements which arebonded together in fixed ratios throughout the sample, these are generally either ironically or covalently bonded.
Law of constant composition means that in compounds, the elementsalways have the same mass ratio.
Elements are materials that cannot be reduced further whereas compounds can be. Compounds do things by interacting with their environments, elementsremain inert. This is very basic chemistry and physics.An element is a substance composed of the same type of atoms, A compound is a substance made of more than one type of atom.
tracking img