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Questions and Answers
Which of the following is an example of a chemical change?
Which of the following is an example of a chemical change?
- An iron tawa/pan/nail left exposed to humid atmosphere
- Grapes getting fermented (correct)
- Food cooked
- Milk left at room temperature during summers
What happens when food is cooked?
What happens when food is cooked?
- A chemical change (correct)
- Cannot be determined
- No change
- A physical change
What happens when food gets digested in our body?
What happens when food gets digested in our body?
- A physical change
- A chemical change (correct)
- Cannot be determined
- No change
How can we determine if a chemical reaction has taken place?
How can we determine if a chemical reaction has taken place?
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What is the difference between a physical change and a chemical change?
What is the difference between a physical change and a chemical change?
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Study Notes
Chemical Changes
- A chemical change involves the transformation of substances and the formation of new substances.
- An example of a chemical change is the cooking of food, as it alters the composition and properties of the ingredients.
Cooking Food
- Cooking induces chemical reactions such as Maillard reaction and caramelization, changing flavor, texture, and nutritional value.
- Heat energy breaks down complex molecules and can lead to nutrient losses in some cases.
Digestion Process
- Digestion transforms food through chemical reactions, breaking down macromolecules like proteins, fats, and carbohydrates.
- Enzymes and acids in the stomach and intestines facilitate these reactions, converting food into absorbable nutrients.
Indicators of Chemical Reactions
- Formation of gas (bubbles or smoke) often signifies a chemical reaction has occurred.
- Changes in color, temperature, or the formation of a precipitate are also indicative of a chemical change.
Physical Change vs. Chemical Change
- In a physical change, the substance may change form (e.g., melting or freezing) but retains its original chemical structure.
- A chemical change results in the production of one or more new substances, altering the original matter’s composition and properties.
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