Answer:
Cr(s) ⟶ Cr⁴⁺(aq) + 4e⁻  
Explanation:
1. Write the skeleton half-reaction
Cr(s) ⟶ Cr⁴⁺(aq)
2. Balance charge
Add electrons to the side that needs them.
You have 4+ on the right and 0 on the left. You must add 4e⁻ to the right to balance the charge.
Cr(s) ⟶ Cr⁴⁺(aq) + 4e⁻
 
        
             
        
        
        
Answer:
             7.32 g of F₂
Solution:
              The equation is as follow,
                                   2 LiI  +  F₂    →    2 LiF  +  I₂
According to equation,
           51.88 g (2 mole) of LiF is produced from  =  37.99 g (1 mole) F₂
So,
                          10 g of LiF will be produced by  =  X g of F₂
Solving for X,
                      X  =  (10 g × 37.99 g) ÷ 51.88 g
                      X  =  7.32 g of F₂
        
             
        
        
        
A mixture can be separated.  Everything in a mixture keeps it's own properties and are not chemically joined together.  I am not completely sure about the compound.  Although with the cake example, the ingredients have been mixed and kind of "fused" together upon baking. Hope this helps a little. (P.S. trail mix is a good example of a mixture.)
        
             
        
        
        
The gas flows from higher concentration/pressure to lower concentration/pressure, which is outside the ball.
        
                    
             
        
        
        
Central "carbon" atom
2 oxygen atoms
held together by "covalent" bonds
has a "1s2 2s2 2px1 2py1 2pz0" electron
 geometry 
carbon atom is "sp" hybridized