Lecture 2

Question 1

what is a heterogeneous mixture

Answer 1

one or more boundaries between components

Question 2

what is a homogenous mixture

Answer 2

no visible boundaries; mixed evenly at microscopic levels; also called solutions; may be gas, liquid, or solid

Question 3

what are pure substances

Answer 3

consists of a single type of chemical.; two categories: elements, compounds

Question 4

difference between elements and compounds

Answer 4

elements cannot be divided into other substances; compounds can be broken into two or more elements

Question 5

what is coulombs law?

Answer 5

a particle with positive electrical charge and a particle with negative electrical charge attract each other; particles with the same charge (positive or negative) repel each other

Question 6

Rutherford’s experiment determined what?

Answer 6

atoms have a positively charged nucleus

Question 7

modern atomic theory states

Answer 7

an atom is made out of negatively charged electrons and a positively charged nucleus