Answer:
a. Boron trifluoride
b. Propane
c. Dinitrogen pentoxide
d. Carbon Dioxide
e. Silicon Octafluroride?
Explanation:
Glad to help :)
 
        
             
        
        
        
The whole Activity , poem and paragraph is missing in the question.
Answer:
(1) Liquid A
(2) Solid A
Explanation:
Using this part of the given poem
Substances and mixtures behave differently,
During boiling and melting most especially
Boiling point of substance is fixed while mixture is not
Substance melts completely but mixture does not
The boiling point of the Pure substance remain fixed after reaching its boiling point this is shown by Liquid A
Solid A is melting completely so Solid A is a pure substance.
 
        
             
        
        
        
Answer:
Element  	Symbol  	Atomic Mass  	# of Atoms  Mass Percent
Chlorine              Cl       35.453                             2        29.670%
Calcium                Ca     40.078                      1         16.770%
Oxygen                 O   15.9994                             8            53.559%                              
Explanation:
 
        
             
        
        
        
A bond allows metal to conduct electricity <span />
        
                    
             
        
        
        
Physical, because the ice is only changing it's state. It's not changing to a new substance.