Name each time a physical or chemical change happen.
A man makes breakfast. He puts some toast in the toaster, and mixes some eggs with a little milk in a bowl. As he begins cooking the eggs, he smells the toast burning. He takes the toast out of the toaster and puts some butter on it, which melts. Finally, he pours some orange juice through a strainer to remove the pulp. He eats the meal, and he digests it as he drives to work in his car.
1. Physical change: Putting the toast in the toaster.
2. Physical change: Mixing the eggs with milk in a bowl.
3. Chemical change: Cooking the eggs.
4. Physical change: Taking the toast out of the toaster.
5. Physical change: Putting butter on the toast, which melts.
6. Physical change: Pouring orange juice through a strainer to remove the pulp.
7. Physical change: Eating the meal.
8. Chemical change: Digesting the meal.
Here are the instances of physical or chemical changes happening:
1. Physical Change: The man puts the toast in the toaster.
2. Physical Change: The man mixes the eggs with milk in a bowl.
3. Chemical Change: The man starts cooking the eggs, resulting in a chemical change as the eggs undergo denaturation and coagulation.
4. Physical Change: The toast starts burning, releasing smoke and changing its chemical composition.
5. Physical Change: The man takes the toast out of the toaster.
6. Physical Change: The man puts butter on the toast, which melts due to the heat from the toast.
7. Physical Change: The man pours orange juice through a strainer, which physically separates the pulp from the juice.
8. Biological Change: The man eats the meal, and his digestive system breaks down the food chemically for absorption of nutrients.
9. Physical Change: The man drives to work in his car, which involves physical motion and heat generation within the car's engine.
In the scenario you described, there are several instances of physical and chemical changes. Let's go through each step:
1. Putting toast in the toaster: This is a physical change because the heat from the toaster causes the bread to become toasted. The change in color, texture, and taste are all physical changes.
2. Mixing eggs with milk: This is a physical change as well because you are combining two substances. Even though the eggs and milk may blend together, no new substances are formed.
3. Cooking the eggs: This involves both physical and chemical changes. Initially, the heat causes the eggs to undergo a physical change, as they change from a liquid to a solid state due to coagulation. However, further cooking causes a chemical change as the proteins in the eggs denature and rearrange their structures, resulting in the firming and browning of the eggs.
4. Smelling the burning toast: This is a sensory experience and not a physical or chemical change.
5. Taking the toast out of the toaster: This is a physical change because you are removing the toast from the heat source, returning it to its original state before toasting.
6. Putting butter on the toast: This is a physical change because the heat from the toasted bread causes the butter to melt. The change in state from solid to liquid is a physical change.
7. Pouring orange juice through a strainer: This is a physical change. While the act of pouring the juice itself doesn't change its chemical composition, using a strainer helps separate the pulp from the liquid, resulting in a physical change.
8. Eating the meal: This is a biological process involved in digestion and does not involve physical or chemical changes that can be observed in the meal itself.
9. Digesting the food: Digestion is a series of complex chemical changes that occur in the body to break down the food into its basic components and absorb nutrients. These changes happen internally and are not directly observable.
10. Driving to work in a car: This is not related to physical or chemical changes and is simply an activity you're engaging in while your body processes the food you consumed.
So, in summary, there are physical changes in toasting the bread, melting the butter, and straining the orange juice. There are both physical and chemical changes in cooking the eggs. The rest of the activities described are unrelated to physical or chemical changes.