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Verizon [17]
3 years ago
13

Which of the following are examples of chemical changes?

Chemistry
1 answer:
maxonik [38]3 years ago
8 0

Answer:

change in composition

a substance decomposing

burning

Explanation:

A chemical change is one in which a new kind of matter is formed. It is always accompanied by energy changes (evolution or absorption of energy in form of heat or light or both).

This process is often irreversible.

  • Chemical changes involves changes in mass.
  • It requires considerable amount of energy.
  • It leads to the production of new kinds of matter

Now, processes such as burning and decomposition are chemical changes and are not easily reversible.

Since new kind of matter is formed, there is a change in composition.

Melting is a physical change that is easily reversed.

Other examples of chemical changes are rusting of iron, precipitation and souring of milk.

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In here Oxygen is the central atom. It makes two bonds with Cl and has two lone pairs. Since, the shape is bent and the hybridization is sp3. Molecular geometry is a bit dissimilar from hybridization. Hybridization is reliant on the number of bonds and lone pairs. Since O has two bonds with Cl, its hybridization is sp3. It is like is this: 1 lone pair/bond = s. 2 lone pairs/bond = sp 3 lone pairs/bonds = sp2, etc. molecular geometry, you count the number of bonds and lone pairs. This has two bonds and 2 lone pairs so if they were all bonds, the molecule would be tetrahedral. 

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