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प्रश्न
Is a change of state of matter – a physical or a chemical change. Give reasons.
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उत्तर
- There are three different states of matter: solid, liquid, and gas. The transition between various states, such as solid to liquid (melting), liquid to gas (boiling), and vice versa (freezing and condensation), is referred to as a change of state.
- Take water (H2O) as an example. There are three states of water: As a solid (ice), a liquid (water), or a gas (steam).
- Water becomes ice (solid) when it freezes. Ice melts and returns to liquid form as water. Water transforms into steam (gas) when it boils. Steam condenses back into liquid water when it cools.
- The chemistry of water (H2O) remains unchanged during these modifications. The actual chemical identity of water remains unchanged; the molecules are merely rearranged.
- We categorize the change of state of matter as a physical change as the substance's chemical makeup does not alter throughout the transition. Even though a substance undergoes a physical change, its chemical identity is unaffected.
- The change of state of matter is a physical change because the chemical composition does not alter; it remains H2O in all states.
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संबंधित प्रश्न
Which of the following are chemical changes?
- Growth of a plant
- Rusting of iron
- Mixing of iron fillings and sand
- Cooking of food
- Digestion of food
- Freezing of water
- Burning of candle
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
State whether the following is physical or chemical changes.
shaping a piece of glass —
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
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Natural and man-made change.
Fill in the blank with the appropriate word of the statement given below:
If a change is permanent and irreversible it is considered a _________ change.
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
Select the chemical changes from the following list of changes
The carbon cycle.
Wood to sawdust:______:: Wood to Ash: Chemical change
