Mixtures & Solutions

Essential Questions What is a mixture? What is a solution? What is the difference between a mixture and a solution? What substances are/are not soluble in water?

How many of you like trail mix? In this trail mix you will see M&M’s, chocolate chips, raisins, & nuts. If you like ONLY M&M’s, you can pick out just the M&M’s. All of these ingredients can be separated- which makes it a MIXTURE.

Mixtures Look at this salad- what makes this salad a mixture? A mixture is two or more substances that are combined without changing any of them. Look at this salad- what makes this salad a mixture? You can separate all the ingredients: Tomatoes, cucumbers, onions, lettuce, and bean sprouts- and its still a salad.

Mixtures The substances in a mixture aren’t permanently combined and their properties don’t change. Items used in a mixture can be separated. Like in a pizza, if you don’t like pepperoni- you can pick them off- but it’s still a pizza!

Mixtures Not all mixtures are solids- think of salt water. If you mix salt and water, it seems like you can’t separate them- but you can. If you boil water, the water evaporates leaving the salt behind. Sand at the beach is also a mixture of small rocks, shells, and other materials.

Mixtures Everything can be separated into different parts. This is what makes it a mixture.

Solutions Now that you have a solid understanding of what a mixture is, lets move on to solutions. Think about making sweetened iced tea.

Solutions A solution is two or more substances that are combined changing the original substance. You cannot separate the ingredients in a solution. Solutions are actually a type of mixture With iced tea, you cannot separate the tea (brown coloring) that’s been added to the water. You also cannot separate the sugar.

Remember, In a mixture- substances can be separated- Solutions can not! http://www.harcourtschool.com/activity/mixture/mixture.html http://www.bbc.co.uk/schools/ks2bitesize/science/materials/reversible_irreversible_changes/play.shtml (physical and chemical changes – read

if you added sand to water? Would it dissolve? What Would Happen… if you added sand to water? Would it dissolve? No- Sand does not dissolve in water rather the particles fall to the bottom of the container. Sand in water is NOT a solution.

Solubility You will see in today’s investigation that substances dissolve differently. Solubility is the measure of how well one substance dissolves in another. Ex. Salad Dressing- As you’ve already learned, oil and water cannot dissolve in each other. Oil is not soluble in water. Same with sand- Sand is not soluble in water therefore the solubility is zero!

Let’s Review C. Which of these is a mixture? A. Apple B. Broccoli C. Ham sandwich D. Carrot stick C.

Let’s Review A. Which of these is a mixture? A. Pail of sand and soil B. Copper wire C. Ring of pure gold D. Pinch of salt A.

Let’s Review B. Which of these is an example of a solution? Granola B. Iced tea C. Pizza D. Salad B.

Name a substance besides sand and oil that are not soluble in water. Let’s Review Name a substance besides sand and oil that are not soluble in water.

Using a Venn Diagram, compare and contrast mixtures and solutions. Let’s Review Using a Venn Diagram, compare and contrast mixtures and solutions. Mixtures Solutions