Tag: chemical reactions

Quizzes (8) Questions (144)

Questions Related to chemical reactions

Multiple choice biology physical resources air as a natural resource types of chemical reactions chemical reactions

Which one is NOT applicable for combustion and respiration processes?

  1. Both are chemical processes

  2. Energy change take place in both

  3. Oxygen gas is consumed

  4. Both processes are fast
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cellular respiration resembles ordinary combustion or burning, in the break down of chemical bonds, use of oxygen, production of carbon dioxide and release of energy, but there are fundamental differences between the two processes.

Combustion releases a large amount of energy in a single step and most of it changes in to heat and some at times in to light and raising the temperature greatly. Cellular respiration releases energy in steps and each energy releasing step is coupled with the synthesis of ATP. Only a small amount of energy dissipates as heat. Respiration may be called as slow burning.

Multiple choice biology physical resources air as a natural resource types of chemical reactions chemical reactions

In respiration carbon and oxygen in _____ are oxidised.

  1. Organic matter

  2. Inorganic matter

  3. Aliphatic carbon

  4. None of above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In respiration oxygen breakdowns food substances mainly glucose and release energy in the form of heat. The carbon and oxygen that are oxidised are present in organic matter. Whereas in burning carbon and oxygen in inorganic matter is oxidized.

Multiple choice biology physical resources air as a natural resource types of chemical reactions chemical reactions

_____ and ______ are produced and released in exhaled air.

  1. $CO _2$ and $H _2$
  2. $H _2O$ and $H _2$
  3. $CO _2$ and water vapour

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Respiration is defined as the movement of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction. The oxygen from air oxidises food substances mainly glucose in their body cells and release energy in the form of heat.

Multiple choice biology physical resources air as a natural resource types of chemical reactions chemical reactions

Respiration requires ___ temperatures whereas burning requires __ temperature.

  1. Room temperature, high temperature

  2. Low temperature, high temperature
  3. $37^oC$, high temperature
  4. $37^oC$, low temperature
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Respiration is a slow process occurring inside the living systems only. Hence, it requires body temperature i.e., $37^0C$ to occur. Whereas burning occurs outside the living system. It requires a high temperature to initiate a chemical change.


Hence, option $C$ is correct.

Multiple choice biology physical resources air as a natural resource types of chemical reactions chemical reactions

Air is an example of homogeneous mixture.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A homogeneous mixture is a solid, liquid, or gaseous mixture that has the same proportions of its components throughout any given sample. 
If we consider some region of air, the gases, their volumes present in one part of the region equal to another one part of same region. We aren't able to divide different gases present in air. 
The statement is true.
Multiple choice biology physical resources air as a natural resource types of chemical reactions chemical reactions

A student finds that as he blows air into a balloon, it becomes bigger. What inference can he make from the above?

  1. Air is a gas

  2. Air has mass

  3. Air is matter

  4. Air occupies space
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a balloon is filled with air then the air exerts force on the walls of the balloon. Due to this force the balloon material stretches and hence size of balloon increases. The material of the balloon is such that it can stretch a lot.

Multiple choice chemistry electrolysis electrolytes and non-electrolytes introduction to electrolysis chemical reactions

An electrolyte:

  1. has positive charge

  2. has negative chargec

  3. should be able to conduct charge without dissociating

  4. should able to form positive and negative ions
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A Chemical compound that conducts electricity by changing into ions like cations and anions when melted or dissolved into a solution.

Eg: Sodium chloride.