Podcast
Questions and Answers
What type of change occurs when an egg is cooked?
What type of change occurs when an egg is cooked?
- Physical change
- Chemical change (correct)
- Neither physical nor chemical change
- Both physical and chemical change
Which of the following is an example of a physical change?
Which of the following is an example of a physical change?
- Digestion of food
- Rusting of iron
- Water boiling (correct)
- Baking a cake
What happens when sugar dissolves in tea?
What happens when sugar dissolves in tea?
- The sugar molecules spread out and mix with the tea molecules (correct)
- A chemical reaction occurs between sugar and tea
- The sugar molecules break down into simpler molecules
- The tea molecules change into sugar molecules
Which of the following processes involves a chemical change?
Which of the following processes involves a chemical change?
What type of change occurs when water is heated and turns into steam?
What type of change occurs when water is heated and turns into steam?
Which of the following processes involve a physical change?
Which of the following processes involve a physical change?
What is the correct classification of the change that occurs when yeast is added to bread dough?
What is the correct classification of the change that occurs when yeast is added to bread dough?
What is the primary reason for the change in color of raw fish when lemon juice is poured on it?
What is the primary reason for the change in color of raw fish when lemon juice is poured on it?
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Study Notes
Physical Changes
- Egg cooking: change in state from liquid to solid
- Boiling water: change in state from liquid to gas
- Boiling milk: change in state from liquid to gas
- Water freezing: change in state from liquid to solid
- Dissolving sugar in a cup of tea: sugar particles spread out and mix with water molecules
Chemical Changes
- Cake baking: chemical reaction between ingredients, resulting in a new substance
- Pouring lemon juice on raw fish and it changes to a white color: acid in lemon juice breaks down protein in fish, changing its color
- Bread rising after adding yeast: fermentation process, yeast converts sugars into carbon dioxide, causing dough to rise
- Mentos being added to diet coke: rapid release of carbon dioxide, causing the soda to foam and erupt
- Photosynthesis: plants convert sunlight, water, and carbon dioxide into glucose and oxygen, releasing energy
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