H3O+(aq) + OH-(aq) --> 2H2O (l)
NaHCO3(s) --> NaH 2+ (aq) + CO3 2- (aq)
NaH 2+ (aq) + H2O (l) --> Na+ (aq) + H3O+ (aq)
H2O (l) + CO3 2- (aq) --> OH- (aq) + HCO3- (aq)
(I'm not completely sure if I did the third question right) I'm sorry if I got it wrong
        
                    
             
        
        
        
The answer is d, hand soap. 
Hand soap is alkaline and red litmus paper turns blue when exposed to alkaline solution.
        
             
        
        
        
Answer: Area of a Triangle Equals Base x Height / 3
Explanation: Hope this works
 
        
             
        
        
        
Answer:
F = 30 N
Explanation:
Given data:
Mass of toy train = 1.5 kg
Acceleration of train = 20 m/s²
Amount of force acting on it = ?
Solution:
The net force on object is equal to the its mass multiply by its acceleration.
Formula:
F = ma
F = force
m = mass
a = acceleration
Now we will put the values in formula.
F = 1.5 kg × 20ms⁻²
F = 30 kg.ms⁻²
kg.ms⁻² = N
F = 30 N
 
        
             
        
        
        
Answer:
C Force of gravity acting on an object
Explanation:
Hope that helps 
have A good day
can I i have brain pls