9/8/15
Post date: Sep 08, 2015 2:42:40 PM
Welcome back after your long labor day weekend! I hope that it was restful.
This week we will continue studying physical properties- characteristics about matter.
First we will review relative density by making a density column using vegetable oil, rubbing alcohol, water, and pancake syrup. All of the liquids will have a volume of 50 milliliters. However, each liquid will have a different MASS. This is because water has less MATTER in it than syrup does ( syrup is much "heavier"). Since they have different masses, they will have different densities. This is an experiment that you can do at home with your family! Make sure to have the same amount of each liquid though :). Over the week, I will upload our journal entries including illustrations and our data.
Here are some density column examples:
Following are some links to learn more about density columns and relative density:
Wednesday thourhg Friday we will focus on mixtures and solutions. These are both, again, ways to describe matter; in other words, being a mixture or a solution is a physical property!
MIXTURE:
a combination of two or more objects
objects keep their physical properties --- THEY STAY THE SAME!
For instance, lets say I put yellow skittles in a bowl with pretzels. Did the pretzels change? NO. Did the skittles change? NO! ( not unless your hand is sweaty). THIS IS A MIXTURE! Two, or more things, together that KEEP THEIR PROPERTIES.
Other examples include:
lucky charms cereal
water and sand ( nothing dissolves)
water and pepper
water and oil
marbles and paper clips
spaghetti and meatballs
laundry hamper full of socks and t-shirts
your pencil box/bag
Usually, these are easy to separate--- you can use tools like:
tongs
tweezers
a sieve or strainer
coffee filter
magnet
adding water ( less dense items will be buoyant and float)
Here are some illustrations of mixtures, as well as some links to help you further understand what a mixture is, and how to identify one:
online simulation about separating mixtures THIS ONE IS SUPER DUPER COOL
SOLUTION:
A special kind of mixture where something DISSOLVES
Properties of the objects change-- SOMETHING DISSOLVES
Some objects dissolve better than other things
Powdered sugar dissolves better than sugar crystals
SOLUBILITY refers to the objects ability to DISSOLVE
These are harder to separate-- usually you would evaporate out the water
this can be done by boiling the solution, or placing it somewhere warm for a few days
The water will evaporate, and leave the other object ( the one that dissolved) behind
Examples include any mixture where AN OBJECT DISSOLVES!!!!
salt water or ocean water
kool-aid
sweet tea
lemonade
our atmosphere ( many gases, including oxygen, dissolve into one another)
chocolate milk
dish soap
Attached is some reading that we will do this week over mixtures and solutions. As we complete them, I will also scan and upload our journal work.