Answer:
A) Q + XZ = X + QZ is a single displacement reaction. 
B) Q + Z = QZ is a synthesis reaction 
C) QT = Q + T is a decomposition reaction 
D) QT + XZ = QZ + XT is double replacement reaction. 
Explanation:
A) Q + XZ = X + QZ
This is a single displacement reaction because it is one in which one element is substituted for another one in a compound. In this case X is substituted for Q.
B) Q + Z = QZ
This is a synthesis reaction because Q and z combine to form a single product QZ.
C) QT = Q + T
This is a decomposition reaction because the compound QT breaks down to form 2 simpler substances Q and T.
D) QT + XZ = QZ + XT
Thus is a double replacement reaction because QT and XZ have exchanged cations to form new compounds QZ and XT
 
        
             
        
        
        
Answer:
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Explanation:
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the particles in gas move so freely that it cannot have a definite density</em></u></h2><h2><u><em>
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moo</em></u></h2>
 
        
             
        
        
        
Explanation:
Protons have a positive charge. Electrons have a negative charge. The charge on the proton and electron are exactly the same size but opposite. Neutrons have no charge.
 
        
             
        
        
        
Location = nucleus , 
and you can see the total charge on the number that written below the substance, which would be 28+ 
hope this helps