Answer:
The reagents correspond to substances that react with others, generating a chemical reaction.
Explanation:
Example:
H2 + 02 -> H202
Hydrogen reacts with oxygen in a synthesis reaction, forming a new compound (hydrogen peroxide) called a product.
 
        
             
        
        
        
Answer:
The beta decay takes place. 
Explanation:
The reaction of radioactivity of carbon 14 to nitrogen 14 is 
There is a beta decay.  
The reaction is 

Here some energy is released in form of neutrino. 
 
        
             
        
        
        
Answer:
You were a freeloader of my questions, so I'll be one too.
 
        
             
        
        
        
Answer:
4 km/hr
Explanation:
The computation of the actual velocity is shown below:
Because the path of its paddles is opposed to the current direction, the real velocity can be determined by deducting the current velocity to its velocity while paddling
So, the actual velocity is 
= Upstream - downstream
 = 19 km/hr - 15 km/hr
 = 4 km/hr
As we can see it is in positive, so it is an upstream direction