Answer:
Positive: Save fuel and reduces greenhouse gas
Negative: Harmful to human and animal health ( underwater animals), Hurts the food chain
Explanation:
I got it from a video. Hopefully it helps you.
 
        
             
        
        
        
Answer:
- Question 19: the three are molecular compounds.
Explanation:
<em>Question 19.</em>
All of them are the combination of two kinds of different atoms in fixed proportions.
- C₂H₄: two carbon atoms per four hydrogen atoms
- HF: one hydrogen atom per one fluorine atom
- H₂O₂: two hydrogen atoms per two oxygent atoms
Thus, they all meet the definition of compund: a pure substance formed by  two or more different elements with a definite composition.
Molecular compounds are formed by covalent bonds and ionic compounds are formed by ionic bonds.
Two non-metal elements, like H-F, C - C, C - H, H-O, H - H, and O - O will share electrons forming covalent bonds to complete their valence shell. Thus, the three compounds are molecular and not ionic.
<em>Question 20. </em>Formula of copper(II) sulfate hydrate with 36.0% water.
Copper(II) sulfate is CuSO₄. Its molar mass is 159.609g/mol
Water is H₂O. Its molar mass is 18.015g/mol
Calling x the number of water molecules in the hydrate, the percentage of water is: 
        
From which we can solve for x:
       
Thus, there are 5 molecules of water per each unit of CuSO₄, and the formula is:
 
        
             
        
        
        
Its C
a catalyst speeds up a reaction by offering the reaction an alternative reaction pathway with a lower activation energy 
hope that helps 
        
             
        
        
        
Answer: Option (A) is the correct answer.
Explanation:
Force acting on a dam is as follows.
                   F =  .......... (1)
 .......... (1)
Now, when we double the depth then it means H is increasing 2 times and then the above relation will be as follows.
                 F' = 
                F' =  ........... (2)
 ........... (2)
Now, dividing equation (1) by equation (2) as follows.
            =
 =  
  
Cancelling the common terms we get the following.
                   =
 =  
     
                    4F = F'
Thus, we can conclude that if doubled the depth of the dam the hydrostatic force will be 4F.
 
        
             
        
        
        
Name	Arsenic
Atomic Mass	74.9216 atomic mass units
Number of Protons	33
Number of Neutrons	42
Number of Electrons	33