Looks like you need to review through the lesson and take notes as it tells you in the lesson what each of these are.
        
             
        
        
        
Answer:
Balances and Scales
A balance compares an object with a known mass to the object in question. One example of a balance is the triple beam balance. The standard unit of measure for mass is based on the metric system and is typically denoted as kilograms or grams.
 
        
             
        
        
        
I think A but I dont really know
 
        
             
        
        
        
Answer:
See solution with all the conditions considered. A gaseous mixture of A and B for which species A is chemically consumed at the catalytic surface.
The total pore reaction rate is stated below and it can be inferred by applying the bellow analogy.