The Chemistry of Cooking: Physical and Chemical Reactions
Questions:
5
Grade:
5
Words:
94
Have you ever wondered why your pancake batter changes from a liquid to a fluffy solid when it s cooked? This is because of chemical and physical reactions. When you mix flour, eggs, and milk, they form a new substance - pancake batter. This is a physical reaction. But when you cook the batter, it changes color and texture. This is a chemical reaction, where heat causes the ingredients to form new substances that make delicious pancakes. So the next time you re cooking, remember, there s a lot of science in every dish!
Question 1
What happens when you mix flour, eggs, and milk?
A
They form a pancake
B
They create a chemical reaction
C
They form pancake batter
Explanation. When you mix flour, eggs, and milk, they form a new substance - pancake batter. This is a physical reaction.
D
Nothing happens
E
They form a physical reaction
Question 2
What type of reaction occurs when you cook the pancake batter?
A
Physical reaction
B
Chemical reaction
Explanation. When you cook the batter, it changes color and texture. This is a chemical reaction, where heat causes the ingredients to form new substances.
C
No reaction
D
Electrical reaction
E
Magnetic reaction
Question 3
What happens during a chemical reaction in cooking?
A
The ingredients stay the same
B
The ingredients create heat
C
The ingredients form new substances
Explanation. During a chemical reaction in cooking, heat causes the ingredients to form new substances.
D
The ingredients disappear
E
The ingredients freeze
Question 4
What type of reaction occurs when flour, eggs, and milk are mixed?
A
Chemical reaction
B
Physical reaction
Explanation. When flour, eggs, and milk are mixed, they undergo a physical reaction forming a new substance - pancake batter.
C
Electrical reaction
D
Magnetic reaction
E
No reaction
Question 5
What is the end product after the chemical reaction during cooking?
A
Pancake batter
B
Raw pancake
C
Delicious pancakes
Explanation. After the chemical reaction during cooking, the end product is delicious pancakes.
D
Liquid batter
E
Eggs and flour
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