Question

Explain how painting of an iron gate prevent it from rusting.​

Answer 1

Answer:

In presence of moisture in air, iron item gets rust on its surface .To prevent rusting a coat of paint is applied regularly on iron surface . This coat stops the contact of moisture and oxygen to iron surface and thus prevent rusting.

Answer 2

Answer:

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Differentiate between physical and chemical changes with their examples.$\huge{\purple{ᴀɴsᴡᴇʀ✓}}$

• In a chemical reaction, there is a change in the composition of the substances in question
• in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.
• A chemical change is a permanent change. A Physical change affects only. physical properties i.e. shape, size, etc.
• Example of chemical changes Fireworks explosion. Rotting bananas. Grilling a hamburger. Saliva digesting sugar with the use of amylase.Examples of Physical Changes Crushing a can.
• Melting an ice cube. Boiling water. Mixing sand and water. Breaking a glass. Dissolving sugar and water. Shredding paper. Chopping wood.

Explanation: