Chem vocab Ch1&2

• notation that uses atomic symbols with numerical subscripts to covey the relative proportions of atoms of the different elements in the substance
• EX: NaCI

• Molecular- gives exact # of atoms that are chemically bonded together
• empirical- shows simplest whole # ration of atoms in substance

• consist of cation and anion
• formula same as empirical formula
• sum of charges

how they are bonded together  to one another in a molecule

large molecules that are made up of smaller molecules repeatedly linked together

the small molecules that are linked together to form the polymer

electrically charged particle obtained from an atom or chemically bonded group of atoms by adding or removing electrons

ex:sodium chloride

anion and cation

when atom picks up extra electron it becomes a negatively charged ion

when ion loses an electron it becomes a cation which is a positively charges ion

the group of atoms or ions explicitly symbolized in the formula

a compound regarded as a union of molecules retaining their identities

substance whose atoms all have the same atomic #

an atom characterized by an atomic number and mass number

• atoms whose nuclei have the same atomic number but different mass #s
• nuclei have same number of protons but different neutrons

a mass unit equal to exactly 1/12 the mass of a carbon-12 atom

the eleents in any one horizontal row of the periodic table

the elements in any one column of the periodic table

an element having both metallic and nonmetallic properties

class of molecular substances that contains carbon combined with the other elements such as hydrogen oxygen and nitrogen

• simplest organic compounds
• those compounds containing hydrogen and carbon

reactive portion of a molecule that undergoes predictable reactions

systematic naming of chemical compounds

• composed of elements other than carbon
• ex:carbon dioxide, carbonates, cyanides

simplest ion formed from a single atom

ion consisting of two or more atoms chemically bonded together and carrying a net electric charge

• coupound composed of only two elements
• ex h20
• first elemet is more metallic 2nd is not so much

• mono
• di
• tri
• tetra
• penta
• hexa
• hepta
• octa
• nona
• deca

molecular compound that yields hydrogen ions, H+, and an anion for each acid molecule when the acid dissolves in water

an acid containing hydrogen oxygen and another element, (can be called central atom

compound that contains water molecules weakly bound in its crystals

symbolic representation of a chemical reaction in terms of chemical formulas

is a starting substance in a chemical reaction

what does the arrow mean in a chemical equation