(a) Evaporation of petrol - This is a physical change. In this process, only the state of petrol changes from liquid to gas. The petrol itself does not change.

(b) Burning of Liquefied Petroleum Gas (LPG) - This is a chemical change. When LPG burns, it reacts with oxygen in the air to produce heat, light, carbon dioxide, and water vapor. This is a new substance, so it's a chemical change.

(c) Heating of an iron rod to red hot - This is a physical change. The iron rod is still iron, it's just hotter and glowing red. No new substance is formed.

(d) Curdling of milk - This is a chemical change. When milk curdles, it changes into a different substance with different properties. The proteins in the milk change their structure, leading to the formation of curd.

(e) Sublimation of solid ammonium chloride - This is a physical change. In this process, ammonium chloride changes its state from solid to gas without going through the liquid state. However, it remains ammonium chloride.

Question

(a) Evaporation of petrol - This is a physical change. In this process, only the state of petrol changes from liquid to gas. The petrol itself does not change.

(b) Burning of Liquefied Petroleum Gas (LPG) - This is a chemical change. When LPG burns, it reacts with oxygen in the air to produce heat, light, carbon dioxide, and water vapor. This is a new substance, so it's a chemical change.

(c) Heating of an iron rod to red hot - This is a physical change. The iron rod is still iron, it's just hotter and glowing red. No new substance is formed.

(d) Curdling of milk - This is a chemical change. When milk curdles, it changes into a different substance with different properties. The proteins in the milk change their structure, leading to the formation of curd.

(e) Sublimation of solid ammonium chloride - This is a physical change. In this process, ammonium chloride changes its state from solid to gas without going through the liquid state. However, it remains ammonium chloride.

Knowee AI · Accepted Answer

(a) Evaporation of petrol - This is a physical change. In this process, only the state of petrol changes from liquid to gas. The petrol itself does not change.

(b) Burning of Liquefied Petroleum Gas (LPG) - This is a chemical change. When LPG burns, it reacts with oxygen in the air to produce heat, light, carbon dioxide, and water vapor. This is a new substance, so it's a chemical change.

(c) Heating of an iron rod to red hot - This is a physical change. The iron rod is still iron, it's just hotter and glowing red. No new substance is formed.

(d) Curdling of milk - This is a chemical change. When milk curdles, it changes into a different substance with different properties. The proteins in the milk change their structure, leading to the formation of curd.

(e) Sublimation of solid ammonium chloride - This is a physical change. In this process, ammonium chloride changes its state from solid to gas without going through the liquid state. However, it remains ammonium chloride.

hich among the following are physical or chemical changes?(a) Evaporation of petrol(b) Burning of Liquefied Petroleum Gas (LPG)(c) Heating of an iron rod to red hot.(d) Curdling of milk(e) Sublimation of solid ammonium chloride

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