Physical or Chemical Change

Transcription

1 Physical or Chemical Change 1) Students will understand the difference between and changes. 2) Students will practice identifying and changes.

2 Teachers' notes Subject Topic Title Grade(s) Cross-curricular link(s) Prior knowledge Intended learning outcome(s) Science Physical and Chemical Changes Physical and Chemical Changes 8th??? Definitions of and properties Understand the difference between and changes.

3 Lesson notes Students completed an intro lab where they tried to figure out what type of change they were observing. I've included the lab materials list, directions, and chart in the first few slides. After discussing the lab, the students completed the chart on slide?? in their notebooks and then we checked answers as a class. The rest of the slides is from a worksheet that I handed out as practice/homework. We used the spinner to decide who would come up to the board and try to identify what type of change it would be.

4 Physical vs. Chemical Changes Using your knowledge of and properties and and changes, complete the activity that follows. Materials: Cup of Baking powder Cup of Baking soda Cup of Sugar Cup of Cornstarch Eyedropper of Iodine Eyedropper of Water Eyedropper of Vinegar 3 small beakers Toothpicks

5 Procedures: 1. Place a small amount of baking soda (about a pinch) into three small beakers. Record the properties of baking soda on the back of your chart. 2. Use an eyedropper to add about 60 drops of water to the baking soda and stir with a toothpick. Record observations in your chart and determine if you are observing a or change. Record the type of change in the small box in your chart. 3. Repeat step 2 but use 20 drops of vinegar instead of 60 drops of water. 4. Repeat steps 2 but use 5 drops of iodine instead of 60 drops of water. 5. Repeat steps 1-4 for each of your other substances (baking powder, sugar, and cornstarch).

6

7 Physical or Chemical Change 1. A newspaper yellowed after a few weeks. 2. The steel wool turned the black pot a shiny silver color. 3. Acid caused limestone to fizz. 4. The back steps are rotting. Pull Pull Pull Pull C P C C 5. The gasoline dried, but it left a bad odor in the room. Pull P

8 Physical or Chemical Change 6. The gravy in the refrigerator jelled. 7. The paint on the car turned dull. 8. You got a cavity in your tooth. Pull Pull Pull P C C 9. The piece of lemon turned the tea cloudy. Pull C 10. Lightning flashed across the sky. Pull P

9

10 Ramon and Marta decided to make supper for their parents and grandmother. While Marta cut up the vegetables and cheese for the salad and boiled an egg, Ramon placed ice cubes into a glass of lemonade made from a powdered concentrate.

11 They had also decided to make and cook some hamburger patties and to broil some frozen french fries. Earlier in the day, Marta had made gelatin by mixing the powder in hot water and then allowing it to cool in the refrigerator until it set.

12 When the meat was no longer red and appeared to be completely cooked and the french fries were golden brown, they called their parents and grandmother. After the meal, it was time for dessert and coffee. Marta and Ramon boiled some water and put it into mugs. Then they added instant coffee powder and sugar.

13 Almost everything was ready. But where was the milk? They searched for it until they remembered that they had left it out of the refrigerator earlier in the day. It smelled sour and had already started to curdle. So they had to serve the coffee black!

14 Later, the scraps were placed in the garbage. Some things were added to the compost heap in the backyard. Papa washed the dishes in steaming hot water, and Ramon dried them. Marta finished an oil painting, while Mama read a book.

15 The entire family agreed that they had enjoyed their supper thoroughly, though Abuelita did have some trouble with her stomach. However, an antacid tablet soon helped soothe the problem. All in all, it was a successful adventure for Marta and Ramon.

16

17 Physical or Chemical Change 1. A newspaper yellowed after a few weeks. 2. The steel wool turned the black pot a shiny silver color. 3. Acid caused limestone to fizz. 4. The back steps are rotting. 5. The gasoline dried, but it left a bad odor in the room. Pull Pull Pull Pull Pull

18 Physical or Chemical Change 6. The gravy in the refrigerator jelled. 7. The paint on the car turned dull. 8. You got a cavity in your tooth. 9. The piece of lemon turned the tea cloudy. 10. Lightning flashed across the sky. Pull Pull Pull Pull Pull

19 Physical vs. Chemical Changes Using your knowledge of and properties and and changes, complete the activity that follows. Materials: Cup of Baking powder Cup of Baking soda Cup of Sugar Cup of Cornstarch Eyedropper of Iodine Eyedropper of Water Eyedropper of Vinegar 3 small beakers Toothpicks

20 Procedures: 1. Place a small amount of baking soda (about a pinch) into three small beakers. Record the properties of baking soda on the back of your chart. 2. Use an eyedropper to add about 60 drops of water to the baking soda and stir with a toothpick. Record observations in your chart and determine if you are observing a or change. Record the type of change in the small box in your chart. 3. Repeat step 2 but use 20 drops of vinegar instead of 60 drops of water. 4. Repeat steps 2 but use 5 drops of iodine instead of 60 drops of water. 5. Repeat steps 1-4 for each of your other substances (baking powder, sugar, and cornstarch).

21

22

23 Ramon and Marta decided to make supper for their parents and grandmother. While Marta cut up the vegetables and cheese for the salad and boiled an egg, Ramon placed ice cubes into a glass of lemonade made from a powdered concentrate.

24 They had also decided to make and cook some hamburger patties and to broil some frozen french fries. Earlier in the day, Marta had made gelatin by mixing the powder in hot water and then allowing it to cool in the refrigerator until it set.

25 When the meat was no longer red and appeared to be completely cooked and the french fries were golden brown, they called their parents and grandmother. After the meal, it was time for dessert and coffee. Marta and Ramon boiled some water and put it into mugs. Then they added instant coffee powder and sugar.

26 Almost everything was ready. But where was the milk? They searched for it until they remembered that they had left it out of the refrigerator earlier in the day. It smelled sour and had already started to curdle. So they had to serve the coffee black!

27 Later, the scraps were placed in the garbage. Some things were added to the compost heap in the backyard. Papa washed the dishes in steaming hot water, and Ramon dried them. Marta finished an oil painting, while Mama read a book.

28 The entire family agreed that they had enjoyed their supper thoroughly, though Abuelita did have some trouble with her stomach. However, an antacid tablet soon helped soothe the problem. All in all, it was a successful adventure for Marta and Ramon.

29