Advertisements
Advertisements
प्रश्न
Is a change of state of matter – a physical or a chemical change. Give reasons.
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.
APPEARS IN
संबंधित प्रश्न
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
True or false
Is melting of ice a reversible change?
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
Classify the following as a physical or a chemical change.
Boiling of water
Classify the following as a physical or a chemical change.
Burning of paper
Given reason:
Burning of paper is a chemical change.
State what is meant by the term – interconversion of matter. Is interconversion of matter a physical change or a chemical change.
Ice kept in a beaker, slowly melts and turns into water. The water in the beaker on solidification is freezing turns back to ice. Give four reasons why the change from ice to water and water back to ice is considered a physical change.
In a solution of salt in water, water is the solute
What is the difference between dissolution of sugar and burning of sugar ?
