Chemistry Questions

Q:

In the thermite process, the reducing agent is

A) Chlorine B) Aluminium
C) Silicon D) Iron
 
Answer & Explanation Answer: B) Aluminium

Explanation:

In the thermite process, the reducing agent is Aluminium.

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Q:

Ozone is concentrated in the

A) Stratosphere B) Troposphere
C) Ionosphere D) Mesosphere
 
Answer & Explanation Answer: A) Stratosphere

Explanation:

Most of the ozone in the atmosphere is found in the layer of stratosphere, which begins about 10.16 kilometers (6.10 miles) above Earth's surface and extends up to about 50 kilometers (31 miles) altitude.

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Q:

After cleaning the thermometer should be placed in

A) Sanitizer B) Ice cold water
C) Mercury D) None of the above
 
Answer & Explanation Answer: A) Sanitizer

Explanation:
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Q:

The relationship between a cathode and an anode involves

A) Electrons B) Neutrons
C) Protons D) Diodes
 
Answer & Explanation Answer: A) Electrons

Explanation:

The relationship between a cathode and an anode involves the transfer of electric charge between them. The cathode is the negative terminal on the battery, which has zero electric potential. The anode is the positive terminal on the battery and has the battery's maximum electric potential. Current flows from the battery's anode (positive terminal) to the cathode (negative terminal). In electron flow, electrons leave the negative side of the battery and move towards the positive side of the battery.

 

Hence, The relationship between a cathode and an anode involves Electrons.

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Q:

Which is the best definition of activation energy?

A) the energy required to break the bonds of reactant molecules B) the energy required to end a chemical reaction
C) the energy required to bind a substrate to an active site D) the energy required to re-form bonds in product molecules
 
Answer & Explanation Answer: A) the energy required to break the bonds of reactant molecules

Explanation:

Activation energy is a minimum amount of energy that required for the chemical reaction to happen or to take place.

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Q:

The current atomic model would be revised if 

A) better microscopes are invented in the future B) a new element is discovered in the future
C) better microscopes were being used to study its structure D) new information about an atoms structure is discovered
 
Answer & Explanation Answer: D) new information about an atoms structure is discovered

Explanation:
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Q:

What are cathode rays made of?

Answer

Cathode rays made of beams of electrons.

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Q:

Which of the following is an example of chemical weathering?

A) Oxidation B) Acid rains
C) Carbonation D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

Chemical weathering is what happens when rocks are broken down and chemically altered.

Chemical weathering is the breakdown of rocks by chemical reactions. Chemical weathering involves changes in the chemical composition of the existing rock to form new rock. Some examples of chemical weathering are hydrolysis, oxidation, carbonation, dissolution, etc.

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