Chemistry Questions

Q:

Which statement about weak bonds is correct?

A) Covalent bonds are weak bonds B) They are hard to break
C) Weak bonds are transient and easily reversible. D) All of the above
 
Answer & Explanation Answer: C) Weak bonds are transient and easily reversible.

Explanation:

In chemistry, Weak bonds are those forces of attraction that, do not take a large amount of energy to break.

 

For example, hydrogen bonds are broken by energies in the order of 4 - 5 kcal/mol.

Ionic bonds, hydrogen bonds and van der Waals interactions are considered weak bonds.

 

Weak bonds are transient and easily reversible.

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Q:

Rutherford's alpha-scattering experiment related to the size of the

A) nucleus B) atom
C) electron D) neutron
 
Answer & Explanation Answer: A) nucleus

Explanation:
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Q:

Ozone hole refers to

A) Decrease in the thickness of ozone layer in Stratosphere B) Increase in thickness of ozone layer
C) Decrease in the ozone layer in Troposphere D) Hole in the ozone layer
 
Answer & Explanation Answer: A) Decrease in the thickness of ozone layer in Stratosphere

Explanation:
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Q:

Which one of the following laws explain the formation of carbon monoxide and carbon dioxide from carbon and oxygen.......

A) Law of conservation of mass B) Law of multiple proportion
C) Law of reciprocal proportions D) Law of definite proportions
 
Answer & Explanation Answer: B) Law of multiple proportion

Explanation:
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Q:

What state of matter is Jello?

A) Liquid B) Solid
C) Colloid D) Gas
 
Answer & Explanation Answer: C) Colloid

Explanation:

Jello is a colloid, a semi-rigid structure i.e, semi-solid suspended in a liquid. When you Heat it up a bit and you'll break the protein bonds of the gelatin and it will liquefy completely and if you freeze, it becomes solid.

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Q:

Dimond is

A) an element B) a compound
C) a mixture D) a liquid
 
Answer & Explanation Answer: A) an element

Explanation:
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Q:

In atomic reactors,graphite is used as

A) lubricant B) fuel
C) linear of the ractor D) moderator
 
Answer & Explanation Answer: D) moderator

Explanation:
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Q:

Is steel a compound?

A) TRUE B) FALSE
Answer & Explanation Answer: B) FALSE

Explanation:

Steel is not a compound or element. Steel is an alloy of iron and carbon and other elements and hence it is a mixture. Because of its high tensile strength and low cost, it is a major component used in buildings, infrastructure, tools, ships, automobiles, machines, appliances, and weapons.

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