Question

a positive result when using benedict will be what color? red/orange blue black brown

Explanation:

Benedict's reagent is used to test for reducing sugars. In the presence of reducing sugars (like glucose), it undergoes a chemical reaction. The initial blue color (due to copper(II) ions in the reagent) changes. A positive result shows a brick - red precipitate (copper(I) oxide formed from the reaction of reducing sugar with copper(II) ions in Benedict's reagent). As shown in the image, Tube 2 (with glucose) has a brick - red precipitate, which is in the red/orange color range. Blue - black is not a color associated with Benedict's positive result (it's more for iodine - starch test). Brown is not the typical color for a strong positive Benedict's test (a strong positive is brick - red, and as the concentration of reducing sugar decreases, the color may go through green, yellow etc., but not brown as a characteristic positive).

Answer:

red/orange