Mixtures and Solutions 5.5C; 5.5D

Chemical Change—Descriptive When something changes to become a new material, it undergoes a chemical change. The chemical particles have been changed to make a new material. Have you ever baked cookies or a cake? You mix ingredients like flour, sugar, and eggs. Then the mixture is baked in the oven. The result is not just a mixture of ingredients. The cookies or the cake is something new and delicious! If we mix carrots, potatoes, and meat, we can make a stew. It is not really something new; it is just a mix of things—we can still pick out each ingredient. The carrots, potatoes, and meat have not gone through a chemical change. The cookie or the cake is the result of a chemical change. We cannot pick out the butter or eggs. We just enjoy the whole thing! Prompt: The rusting truck in the photograph is going through a slow chemical change. Describe the picture with as much detail as you can.

Chemical Change—Expository When something changes to become a new material, it undergoes a chemical change. The chemical particles have been changed to make a new material. Have you ever baked cookies or a cake? You mix ingredients like flour, sugar, and eggs. Then the mixture is baked in the oven. The result is not just a mixture of ingredients. The cookies or the cake is something new and delicious! If we mix carrots, potatoes, and meat, we can make a stew. It is not really something new; it is just a mix of things—we can still pick out each ingredient. The carrots, potatoes, and meat have not gone through a chemical change. The cookie or the cake is the result of a chemical change. We cannot pick out the butter or eggs. We just enjoy the whole thing! Prompt: Imagine a bucket of pure sand. Now you add some water and shells. Has there been a chemical change? Explain why or why not.

Mixtures—Expository There are mixtures all around us. A mixture is two or more ingredients that are blended, or mixed, together. The ingredients can be solids, liquids, or gases. They do not combine chemically—that means they can be separated. Have you ever used chocolate powder or syrup to make chocolate milk? The powder or syrup is mixed with milk to make a tasty drink. But, what happens if you let the chocolate milk sit for a while after you mix it? The chocolate powder and the milk start to separate. If you leave it sitting long enough, you will see a dark pile of powder at the bottom of the glass. Another common mixture you see all the time is mud. Smoke, muddy water, and juice drinks are all examples of everyday mixtures. Prompt: Tell the steps you would follow to make chocolate milk using chocolate powder and white milk. Use enough details so that someone could follow your directions. Then, explain how someone might separate the powder from the milk after it has been mixed.

Mixtures—Persuasive There are mixtures all around us. A mixture is two or more ingredients that are blended, or mixed, together. The ingredients can be solids, liquids, or gases. They do not combine chemically—that means they can be separated. Have you ever used chocolate powder or syrup to make chocolate milk? The powder or syrup is mixed with milk to make a tasty drink. But, what happens if you let the chocolate milk sit for a while after you mix it? The chocolate powder and the milk start to separate. If you leave it sitting long enough, you will see a dark pile of powder at the bottom of the glass. Another common mixture you see all the time is mud. Smoke, muddy water, and juice drinks are all examples of everyday mixtures. Prompt: Persuade your parents to let you come up with your own mixture from ingredients you have in your refrigerator or pantry. Tell them what you want to mix together and how you think it will look and taste.

Physical Change—Narrative You cut stones to make a path. You stack bricks to build a building. Ice melts. These things have changed, but they are still the same type of matter that you started with. The stone is still a stone. A brick is still a brick. Water is still water, whether it is a solid or a liquid. Because these things have not changed into a new material, we call this a physical change. A physical change can make something look different, but it’s till the same matter that it was before. If we cut down a tree to build a bench, the wood is still wood. Only the shape has changed. If water changes state from liquid to solid or gas, it is still water. You can always add or take away heat to turn it back into liquid water. Prompt: Imagine what is happening in this picture and write a story about it. Where is this building? What is the purpose of the building?

Physical Change—Persuasive You cut stones to make a path. You stack bricks to build a building. Ice melts. These things have changed, but they are still the same type of matter that you started with. The stone is still a stone. A brick is still a brick. Water is still water, whether it is a solid or a liquid. Because these things have not changed into a new material, we call this a physical change. A physical change can make something look different, but it’s till the same matter that it was before. If we cut down a tree to build a bench, the wood is still wood. Only the shape has changed. If water changes state from liquid to solid or gas, it is still water. You can always add or take away heat to turn it back into liquid water. Prompt: Your parents want to take you on a vacation. You would like to visit the Washington Monument in Washington, D.C. Write a letter to your parents explaining why they should take you to visit this national monument.