Identify the missing coefficient in the balanced equation and classify the type of reaction.
casn2 + 6h20 _ca(oh)2 + 2nh3
4: single displacement
3. single displacement
4: double displacement
3; double displacement

3; Double Displacement

Explanation:

Balancing is making the number of atoms of each element same on both the sides  (reactant and product side).

To find the number of atoms of each element we multiply coefficient and the subscript  

For example contains  

5 × 1 = 5 ,Ca atoms and

5 × 2 = 10, Cl atoms  

If there is a bracket in the chemical formula  

For example we multiply coefficient × subscript × number outside the bracket to find the number of atoms  

(Please note: 3 is the coefficient, and if there is no number given then 1 will be the coefficient )

So

3 × 3 = 9 , Ca atoms  

3 × 1 × 2 = 6, P atoms  

3 × 4 × 2 = 24, O atoms are present

Let us balance the equation  given

(UNBALANCED)

Reactant side           Number of atoms or groups                   Product side

                                       of each element    

3                                                 Ca                                                           1

2                                                  N                                                            2

12                                                H                                                            8

6                                                  O                                                            2

Multiplying on the right side by 3, we will have

Reactant side           Number of atoms or groups                   Product side

                                       of each element    

3                                                 Ca                                                           3

2                                                  N                                                            2

12                                                H                                                            12

6                                                  O                                                            6

Balanced

a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock