compound: a substance composed of two or more elements chemically combined in definite proportions by weight. mixture: two or more substances that are not chemically united
such as air. solution: a uniform mixture of varying proportions of a solvent and a solute. for many of our students
this is the lesson you've been waiting for. lesson. six. left channel. right channel. hydrogen
h
+1. sodium
na
+1. magnesium
mg
+2. aluminum
al
+3. potassium
k
+1. calcium
ca
+2. chromium
cr
+2
three
six. any physical difficulty with a record
or a turntable
is taken care of. do you think that led zeppelin and frank sinatra would go together?
edit. no. combinations of music. you're about to play a sole
45 rpm recording
but the turntable is set at 33 and 1/3
and the record plays very slowly. let's pick up the tempo a bit
eh?
now let us imagine you are in the middle of your disk jockey program. this is the mark of a professional. yeah
if you could throw a couple.yeah uhuh. right when he's playin' the drum. let him play a couple' beats alone. eeeeuuh. uh!
oh i'm sorry
i had the turntable at the wrong speed. listen!
scratching -- the greatest thing on earth!
what do you do?
what do you do?
drop!
chemical change: a change that alters the composition of the molecules of a substance. new substances with new properties are produced. drop. from now until your next lesson
we want you to study carefully every section of lesson six
and to go back over lesson 4. practice carefully
and you will be ready for the new techniques and new situations we will cover together in lesson 5.