What will you observe if you add cuso4 to a solution containing glucose?

The blue color of copper (ii) sulfate will change to green, yellow, orange ,red and then a dark red or brown.
Glucose is a reducing sugar; reducing sugars are sugar that forms an aldehyde or ketone in the presence of an alkaline solution. Reducing sugars reduce the blue copper sulfate from the Benedict's solution to a red brown copper sulfide; which is seen as the precipitate and is responsible for the color change. 

Ibelieve y y even though i've only taken chemistry for one year

The air is going to come out because of the low pressure.