Scalping trading scenerio. Will it fail?

I am looking for some experienced opinion on a scalping scenerio.

Say a stock is trending upwards big time (+30% up as of 10 am) therefore i decide to place a bet that it will move at least few % points more and buy 2000 shares at say $5.

My goal is to make quick $200 (2%) so i place a limit sell at $5.1 as soon as my buy order is executed.

Now lets say the price reaches 5.1 as planned, Could there be a scenario where my limit sell order will not execute or is it possible that i will not be able to sell these 2000 shares once the price reaches 5.1?

I tried this scenerio in Questrade practice account which shows data from previous day and it worked. What factors can cause it to fail in real time??