Answer:
C) The student and desk have to be in contact to apply the force.
Explanation:
I am pretty sure :)
 
        
                    
             
        
        
        
Answer: Option (B) is the correct answer.
Explanation:
Degree of randomness of the molecules of a substance is known as entropy. More is the kinetic energy between the molecules of a substance more will be the degree of randomness.
Therefore, when a substance is present in a gaseous state then it has the maximum entropy. In liquid state, molecules are closer to each other so, there is less randomness between them. 
On the other hand, in solid state molecules are much more closer to each other as they arr held by strong intermolecular forces of attraction. Therefore, they have very less entropy.
- When liquid water is formed from gaseous hydrogen and oxygen molecules then gas is changing into liquid. So, there is decrease in entropy.
- When  decomposes then the reaction will be as follows. decomposes then the reaction will be as follows.
              
 
Since, 1 mole is producing 2 moles. This means that degree of randomness is increasing as both the molecules are present in gaseous form.
- In formation of a precipitate, aqueous solution is changing into solid state. Hence, degree of randomness is decreasing.
- Rusting of iron also leads to the formation of solid as it forms  . .
Thus, we can conclude that decomposition of  gas to
 gas to  gas is the process that is expected to have an increase in entropy.
 gas is the process that is expected to have an increase in entropy.
 
        
             
        
        
        
Answer: The Answer is B. Energy can not be created nor destroyed.
Explanation:
 
        
             
        
        
        
Explanation: 
The experiment is performed at a constant atmospheric pressure. The experiment proceeds by placing an empty flask in a boiling water bath. As the temperature increases, the air inside the flask expands. Afterwards, the gas is cooled in a water bath by maintaining the amount of the air in the flask constant.
 
        
             
        
        
        
Answer:
You use Bleach, Dimethyl Ammonium Chloride, Sodium Nitrite, Ethyl benzyl Ammonium Chloride, Lemon citrus, Baking soda, ETC
Explanation:
You use these in some of your cleaning supplies and home-made remedies.