Answer:
a) 2NaOH+H2SO4→Na2SO4+2H2O2NaOH+H2SO4→Na2SO4+2H2O
b) Số phân tử NaOH : Số phân tử H2SO4 = 2:1
Số phân tử NaOH : Số phân tử Na2SO4 = 2:1
Số phân tử NaOH : Số phân tử H2O = 2:2
 
Explanation:
 
        
             
        
        
        
Becquerel  did not discover that the amount of exposure on the paper was proportional to the amount of uranium that was present in the rocks 
<h3>What is radioactivity?</h3>
The phenomenon of radioactivity was discovered by the French scientist Henri Becquerel in 1896 when he placed photographic paper in a drawer with some radioactive rocks.
We have to note that Becquerel  did not discover that the amount of exposure on the paper was proportional to the amount of uranium that was present in the rocks hence the stetement is false.
Learn more about radioactivity: brainly.com/question/1770619?
 
        
             
        
        
        
Answer:

Explanation:
To find the weight (W) of the pond contents first we need to use the following equation:
 (1)
   (1)
Where m the mass and g is the gravity  
Also, we have that the mass is:
 (2)
  (2)     
Where ρ is the density and V the volume
We cand calculate the volume as follows: 
 (3)
   (3)
Where L is the length, w is the wide and d is the depth  
By entering equation (2) and (3) into (1) we have:

 
   
 
              
Therefore, the weight of the pond is 6.65x10⁶ lbf.
I hope it helps you!
 
        
             
        
        
        
Answer: False
Explanation:
Since the given equation is not balanced properly.
Since oxygen and hydrogen atoms are not balanced.
There should be 6 H2O (g) molecules and 14 mol H2 (g)
 
        
             
        
        
        
Answer:
See explanation
Explanation:
Air contains a mixture of several molecules and compounds such as oxygen and carbon dioxide.