Science Lesson: Liquid

Science Lesson: The State of Matter we call LIQUID
(All my information (definitions, explanations,etc.) came from Chem4kids. Check it out they have a GREAT site!!!)
Here we have some of our supplies displayed and they are putting names on their Science journals
*******************************************************************

Liquid= Solids are hard things you can hold. Gases are floating around you and in bubbles. What is a liquid? Water is a liquid. Your blood is a liquid. Liquids are an in-between state of matter. They can be found in between the solid and gas states. They don’t have to be made up of the same compounds. If you have a variety of materials in a liquid, it is called a solution.
Solutions have an even concentration throughout the system. An example: Sugar in water vs. Sand in water. Sugar dissolves and is spread throughout the glass of water. The sand sinks to the bottom. The sugar-water could be considered a solution. The sand-water is a mixture.
SOLUTIONS AND MIXTURES Before we dive into solutions, let’s separate solutions from other types of mixtures. Solutions are groups of molecules that are mixed up in a completely even distribution. Hmmm. Not the easiest way to say it. Scientists say that solutions are homogenous systems. Other types of mixtures can have a little higher concentration on one side of the liquid when compared to the other side. Solutions have an even concentration throughout the system. An example: Sugar in water vs. Sand in water. Sugar dissolves and is spread throughout the glass of water. The sand sinks to the bottom. The sugar-water could be considered a solution. The sand-water is a mixture.
MAKING SOLUTIONS So what happens? How do you make that solution? Mix the two liquids and stir. It’s that simple. Science breaks it into three steps. When you read the steps, remember… Solute=Sugar, Solvent=Water, System=Glass. 1. The solute is placed in the solvent and the concentrated solute slowly breaks into pieces. 2. The molecules of the solvent begin to move out of the way and they make room for the molecules of the solute. Example: The water has to make room for the sugar molecules. 3. The solute and solvent interact with each other until the concentration of the two substances is equal throughout the system. The concentration of sugar in the water would be the same from a sample at the top, bottom, or middle of the glass.
Viscosity is a measure of the resistance of a fluid which is being deformed by either shear stress or extensional stress. In general terms it is the resistance of a liquid to flow, or its “thickness”. Viscosity describes a fluid’s internal resistance to flow and may be thought of as a measure of fluid friction. Thus, water is “thin”, having a lower viscosity, while vegetable oil is “thick” having a higher viscosity.
********************************************
Today we observed “Liquid” using our sight, smell, taste and touch. I made the boys little science journals and they recorded with pictures their observations from our experiments we performed. I also added some descriptions to their pictures to help tell the story. They had a blast being little Scientist!! I encourage you to try a little Science with your kids!!

Here we took a completely full cup of (very warm) water and we were able to add 3 tsps of sugar before the water overflowed. Even the the water filled the cup to the brim there was still space available. We were able to prove that with this experiment, you see the sugar fit in the spaces between molecules =o)
Here they are observing different types of liquids. How they look, smell, taste and feel different. Liquids we used: Worch. Sauce, Salad Dressing, Honey, Syrup
Here we took three different liquids (milk, oil & water) and again observed the look and feel of them and than we dropped marbles in them to see which liquid the marble would fall through the fastest. It happened to fast for us to tell which one “won” but the boys got a kick out of doing it.
I believe this was their favorite part and it was their own idea. They took the three glasses we used above and added other liquids to them to see how they changed. They added things like: ketchup, salad dressing, mustard, worch. sauce, honey, syrup, duck sauce and ….? They observed the way the oil kept separating, how some liquids dissolved and some didn’t, how the color changed and they asked to use our Discovery scope to look at the results up close!
Here is part of our mess……….it’s a good thing daddy wasn’t home to see it =o)
Advertisements

2 Comments Add yours

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s