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Class 7
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Chemistry
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Physical and Chemical Changes
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Chemical Changes
Chemical Changes
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What Is a Chemical Change and Examples
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Chemical Change
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Chemical Change
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Important Questions
Which of the following are chemical changes?
(
a
)
Growth of a plant
(
b
)
Rusting of Iron
(
c
)
Mixing of iron fillings and sand
(
d
)
Cooking of food
(
e
)
Digestion of food
(
f
)
Freezing of water
(
g
)
Burning of a candle.
Medium
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Anaerobic bacteria digest animal waste and produce biogas(Process-A). The biogas is then burnt as fuel(Process-B). The following statements pertain to these changes. Choose the correct one.
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Rusting of iron is a chemical change because:
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Which of the following change is not a chemical change?
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Photosynthesis in plants is a ________ change.
Easy
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Which of the following is not a physical change?
Medium
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Which of the following is a chemical change:
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When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
Medium
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When a magnesium ribbon burns in air, the ash formed is dissolved in water:
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What is a chemical change? Explain with example.
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