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     Time = (displacement) / (magnitude of average velocity) .
        
             
        
        
        
True 
The half-life isn’t applicable to a first order reaction because it does not rely on the concentration of reactant present. However the 2nd order reaction is dependent on the concentration of the reactant present. 
The relationship between the half life and the reactant is an inverse one.
The half life is usually reduced or shortened with an increase in the concentration and vice versa.
 
        
             
        
        
        
Correct choices are marked in bold:
travel in straight lines and can bounce off surfaces  --> TRUE, normally electromagnetic waves travel in straight lines, however they can be reflected by objects, bouncing off their surfaces
travel through space at the speed of light  --> TRUE, all electromagnetic waves in space (vacuum) travel at the speed of light,  )
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travel only through matter  --> FALSE; electromagnetic waves can also travel through vacuum
travel only through space  --> FALSE, electromagnetic waves can also travel through matter
can bend around objects  --> TRUE, this is what happens for instance when diffraction occurs: electromagnetic waves are bended around obstacles or small slits
move by particles bumping into each other  --> FALSE, electromagnetic waves are oscillations of electric and magnetic fields, so no particles are involved
move by the interaction between an electric field and a magnetic field --> TRUE, electromagnetic waves consist of an electric field and a magnetic field oscillating in a direction perpendicular to the direction of motion of the wave