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Questions and Answers
What is the nature of a chemical change?
What is the nature of a chemical change?
- The initial substance disappears
- The initial substance remains the same
- The identity of the initial substance changes (correct)
- The initial substance becomes invisible
How can we recognize that a chemical reaction has occurred?
How can we recognize that a chemical reaction has occurred?
- When the substance becomes invisible
- When a physical change occurs
- When a chemical change occurs (correct)
- When the substance disappears
What happens when food is cooked?
What happens when food is cooked?
- A chemical change occurs (correct)
- The food disappears
- The food becomes invisible
- A physical change occurs
What happens when grapes get fermented?
What happens when grapes get fermented?
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What happens when we respire?
What happens when we respire?
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