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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?
What happens when food is cooked?
What happens when food is cooked?
What happens when food gets digested in our body?
What happens when food gets digested in our body?
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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Description
Test your knowledge on chemical reactions and equations with this quiz. Explore what happens in various situations of daily life, such as leaving milk at room temperature, exposing iron to a humid atmosphere, or fermenting grapes. Understand the processes of cooking, digestion in our body, and respiration.
