Chem: Quiz 1 Flashcards
What is a physical change?
when a substance undergoes a change that does NOT change the chemical composition
- change of state
- change in texture
What is a chemical change?
when a substance undergoes a change that DOES change the chemical composition
- changes in color
- burning
What is an atom?
the smallest recognizable unit of an element
What is an element?
the smallest unit that retains chemical properties
What is a molecule?
two or more elements joined together
What is an ion?
atoms that gain or lose electrons, and are positively or negatively charged
What is an ionic bond?
a metal and non-metal joined together that do not share electrons
What is a covalent bond?
2 or more non-metals joined that share electrons
What is a cation?
positive
What is an anion?
negative
What is a polyatomic ion?
molecules with a charge
What is hypovalent?
When an atom has less than a full octect
What are radicals?
odd numbers of electrons
What is an expanded octet?
Period 3 or below
protons
positive charge
