Answer:
The "2" tells us that there are 2 hydrogen atoms in this compound.
Explanation:
 
        
             
        
        
        
Answer:
The speed of molecule decreases and temperature also decreases
Explanation:
Kinetic energy of the molecules of a subsance is directly proportional to the temperature of molecule So as the kinetic energy decrease, temperature also decreases. decreses their speed.
 
        
             
        
        
        
Explanation:
36-4/4= 9 m/squared. meter per squared.
acceleration unit is meter per second Square.equation is velocity by time.for average final(36) minus initial(4)
 
        
             
        
        
        
As per the question, the velocity of the airplane [v] = 660 miles per hour.
The total time taken by airplane [t] = 3.5 hours.
We are asked to determine the total distance travelled by the airplane during that period.
The distance covered [ S] by a body is the product of velocity with the time.
Mathematically distance covered = velocity × total time 
                                                       S = v × t
                                                         = 660 miles/hour ×3.5 hours
                                                         = 2310 miles.
Hence, the total distance travelled by the airplane in 3.5 hour is 2310 miles.
 
        
             
        
        
        
Answer: set up proportions 
Explanation: