1. Physical Science Review Part 2 Mixtures and Solutions

2. What is a mixture? Mixtures are absolutely everywhere you look. Mixtures are the form for most things in nature. Rocks, air, or the ocean, they are just about anything you find. They are substances held together by physical forces, not chemical. That statement means the individual molecules enjoy being near each other, but their fundamental chemical structure does not change when they enter the mixture.

3. Mixtures are everywhere! There are an infinite number of mixtures. Anything you can combine is a mixture. Think of everything you eat. Just think about how many cakes there are. Each of those cakes is made up of a different mixture of ingredients.

4. Mixtures are everywhere! If you put sand into a glass of water, it is considered to be a mixture. You can always tell a mixture because each of the substances can be separated from the group in different physical ways. You can always get the sand out of the water by filtering the water away. Click on the link below to try your hand at the Mixtures Lab. http://www.harcourtschool.com/activity/mixture/mix ture.html

5. Solutions Solutions are groups of molecules that are mixed up in a completely even distribution. 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.

6. Can Anything Be In Solution? Pretty much. Solutions can be solids dissolved in liquids. They could also be gases dissolved in liquids (such as carbonated water). There can also be gases in other gases and liquids in liquids. If you mix things up and they stay at an even distribution, it is a solution.

7. Solute vs. Solvent A simple solution is basically two substances that are going to be combined. One of them is called the solute. A solute is the substance to be dissolved (sugar). The other is a solvent. The solvent is the one doing the dissolving (water).

8. Activity: Use the following recipe for Blueberry Pancakes and see if you can identify the mixtures and solutions, Ingredients: ¾ c. flour 1 tbsp. sugar 1 tsp. baking powder ½ tsp. salt 1 tbsp. margarine 1 egg ¾ c. milk ½ c. blueberries, washed and drained extra margarine for the pan Directions: 1.In a large bowl, sift together the flour, sugar, baking powder, and salt. Set the bowl aside. 2.Melt the margarine in a small saucepan. 3.Crack the egg into a medium-size bowl, then add the milk and melted margarine. 4.Whisk egg mixture until it is well mixed. 5.Add the flour mixture to the egg mixture. Whisk again until both mixtures are blended together. 6.Put extra margarine in the saucepan and heat it on the stovetop on medium heat. It is hot enough when the margarine starts to bubble. 7.Use a measuring cup or a small ladle to spoon the batter into the pan. Put some blueberries on top of each pancake. 8.Cook your pancakes on medium heat until small bubbles appear on the top. 9.Use a spatula to see when your pancakes are light brown on the bottom. When they are, flip them over with the spatula. 10.Cook for another few minutes until the pancakes are light brown on the other side. 11.Remove your pancakes and put them on plates to enjoy! Use colored pencils and mark on the recipe where there is a mixture and where there is a solution.