8 Questions
What type of change occurs when an egg is cooked?
Chemical change
Which of the following is an example of a physical change?
Water boiling
What happens when sugar dissolves in tea?
The sugar molecules spread out and mix with the tea molecules
Which of the following processes involves a chemical change?
Egg cooking
What type of change occurs when water is heated and turns into steam?
Physical change
Which of the following processes involve a physical change?
water freezing
What is the correct classification of the change that occurs when yeast is added to bread dough?
chemical change
What is the primary reason for the change in color of raw fish when lemon juice is poured on it?
chemical reaction with acid
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
Identify whether a process is a physical or chemical change. Answer questions about everyday scenarios like cooking, baking, and more.
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