Classifying Changes as Physical or Chemical
The content provides examples of scenarios involving bread, toasting, and coiling a wire, prompting readers to classify each change as a physical or chemical change. The explanations for each example are supported with evidence, helping readers understand the distinction between the two types of changes based on observable characteristics.
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Presentation Transcript
On your bell work paper, Write Wednesday and answer the following questions: Classify each as physical or chemical change. EXPLAIN your answer; use evidence. 1. A student removes a loaf of bread hot from the oven. The student cuts a slice off the loaf and spreads butter on it. 2. Your friend decides to toast a piece of bread but leaves it in the toaster too long. The bread is black and the kitchen if full of smoke. 3. A straight piece of wire is coiled to form a spring.
On your bell work paper, Write Wednesday and answer the following questions: Classify each as physical or chemical change. EXPLAIN your answer; use evidence. 1. A student removes a loaf of bread hot from the oven. The student cuts a slice off the loaf and spreads butter on it. Physical because it is still bread and butter 2. Your friend decides to toast a piece of bread but leaves it in the toaster too long. The bread is black and the kitchen if full of smoke Chemical because it is burnt 3. A straight piece of wire is coiled to form a spring. Physical because it just changed the shape
EXAMPLES: Spreading butter, Melting ice cream, Cutting vegetables
EXAMPLES: Changes color; Produces heat, light, or sound; Gas or odor formed; Solid formed; Difficult to reverse
