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प्रश्न
Classify the following changes as physical or chemical.
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उत्तर
- boiling — Physical
- curdling of milk — Chemical
- photosynthesis in plants — Chemical
- melting of a solid (wax) — Physical
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संबंधित प्रश्न
Tick the most appropriate answer
2. Melting of ice is a
- reversible change
- irreversible change
- chemical change
- none of these
Fill in the blank
change in which the substance can be brought back to its original state is called a ............... change.
Fill in the blank.
Changes that occur in nature are called ........................
Write short answer.
Name two reversible changes.
Write short answer.
What are man-made changes ?
Tick (√) the correct alternative from the choice given for the following statement.
An example of both physical and chemical change is
True or false
Dissolving of a solid in liquid is a physical change.
Name two reversible changes.
Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
State the conclusions which can be drawn, to represent photosynthesis as a physical or a chemical change.
