Question

In 1 sentence, what is the definition of a chemical change in science. Write it in 7th grader words too plz
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List an example of a chemical change as well.
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List an example of physical change
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When someone bakes a cake, or bakes cookies, what type of change is taking place? (Chemical change or physical change). What evidence supports your answer?
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Write a very short answer. How are chemical and physical changes different.
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Describe how chopping wood is different from burning wood. Be sure to state which is an example of a physical change and which is an example of a chemical change.
Answered by GPT-4o mini
A chemical change is when substances combine or break apart to form new substances with different properties. In simpler words, it's when things change into something completely new and different, like when you bake a cake from flour and eggs.
Answered by GPT-4o mini
An example of a chemical change is the rusting of iron, where iron reacts with oxygen and water to form a new substance called iron oxide, or rust.
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An example of a physical change is melting ice into water, where the ice changes its state but remains H2O in both forms.
Answered by GPT-4o mini
Baking a cake or cookies involves a **chemical change** because the ingredients combine and undergo reactions to form new substances, such as the sugars caramelizing, the proteins in eggs coagulating, and the formation of gases that cause the baked goods to rise. Evidence supporting this includes the change in texture, flavor, and appearance, as well as the release of gases and the production of heat during baking, which all indicate that new substances have been formed.
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Chemical changes create new substances with different properties, while physical changes only alter the form or appearance of a substance without changing its identity.
Answered by GPT-4o mini
Chopping wood is a **physical change** because it only changes the size and shape of the wood without altering its chemical composition. In contrast, burning wood is a **chemical change** because it transforms the wood into new substances, such as ash, smoke, and gases, through a reaction with oxygen.