it14spr101.40DC2T4 5 6
Card Set Information
it14spr101.40DC2T4 5 6
How is a molecule formed?
when two or more atoms combine
What does molecular formula show?
it depicts the numbers and kinds of atoms in a molecule by the use of subscripts
What does structural formula do?
shows how atoms bond and how they are arranged in a molecule
What are electron shells?
they hold the electrons of an atom
What is the octet rule?
The outer shell attempts to be filled to 8 electrons, but the innermost electron shells are filled first
How are bonds formed?
when atoms combine
What is a valence electron?
an electron in the outer shell of an atom that can combine/shared with other atoms to form molecules
What are inert atoms?
Atoms that have completely full outermost electron shells that are not reactive
What are ions?
atoms that gain or lose electrons and become electrically charged
How are cations formed?
cations are positively charged atoms because of losing electrons
What are anions?
atoms that become negatively charged because they gain electrons
What is an ionic bond?
Attraction between a cation and an anion that is formed when electrons are transferred from one atom to another atom
How is a covalent bond formed?
Formed when atoms share electrons in an attempt to fill the outer shell
What is a polar molecule?
Specialized molecule where electrons are not shared equally and the molecule has a slight positive charge at one end and a slight negative charge at the other
What is a hydrogen bond?
a bond formed by the attraction of a positive hydrogen end of a polar molecule (water) to the negative oxygen end of another polar molecule (water)
What are reactants?
substances being changed
What are products?
any substances formed at the end of a chemical reaction
When does synthesis reaction occur?
Occurs when two or more atoms, ions, or molecules bond to form a more complex structure
When does decomposition reaction take place?
Occurs when the bonds of a reactant molecule break to from simpler molecules
When does exchange reaction take place?
Occurs when parts of two different kinds of molecules trade positions
When does reversible reaction occur?
Occurs when products can change back to the reactant or reactants
What is a catalyst?
Molecules that influence the rates of chemical reactions but are not consumed in the reactions