thirdquartjar.Again, cover thejarand shake it.Noticeandrecordthe levelof
theliquidin thisjaras well as itsappearance.
Results:The grape juiceandwater mixed with eachothervery easily. When
you allowed them to stand, they did not separate. The water and oil did not mix
easily. Aftershakingthejarveryhard,the oil and water seemed to mixtogether.
But when you allowed the mixture to stand, the waterandoil soonseparated,
andthe oil came to the top. Thealcoholand water seemed to act like the grape
juice and water.Thatis, they mixed with eachothereasily. However, there was
one big difference. Two pints in this case did not make Iquart.
Some liquids when put togetherform mixtures, just as some solids do.
Neitheroneofthem changes chemically or physically. This is whathappenedto
the water and the juice. When liquids behave this way, they are said todiffuse,
andthey are calledmiscible. Liquids thatwill not diffuse with oneanother,
like oil and water, are callednon-miscible.
When you have aproductthatyou know consistsoftwo or more liquids, you
can'talways telljustbylookingif it is asolutionor not. Somecombinations
of non-miscible liquids are made to look likeordinarysolutions. At one time
people were used to seeing the cream at thetopof the milk bottle. The cream
andthemilk would not mix.Nowadayswe buyhomogenizedmilk. The cream
andmilkappearto form only one liquid. Chemists discoveredthatif they made
the particles, orglobulesofbutterfatsmall enough, they would remain afloat in
evenquantitiesthroughoutthe milk, eventhoughthey still would notactually
dissolve in the milk. The milk and creamtogetherform anemulsion,a liquid
with fatty particles suspended in it.