Edexcel IAL CP1 - Benedicts Test Quiz

What is the independent variable in the Benedict’s test for reducing sugars?

• Amount of test solution

• Temperature of the water bath

• Colour change of Benedict’s reagent

• Concentration of reducing sugar

What is the dependent variable in the Benedict’s test for reducing sugars?

• Colour change of Benedict’s reagent

• Temperature of the water bath

• Amount of test solution

• Concentration of reducing sugar

What does a blue colour indicate in the Benedict’s test for reducing sugars?

• Low concentration of reducing sugar

• Positive result

• High concentration of reducing sugar

• Negative result

What does a colour closer to brick-red indicate in the Benedict’s test for reducing sugars?

• Negative result

• Low concentration of reducing sugar

• High concentration of reducing sugar

• Positive result

What does a colour change from brown to blue-black indicate in the iodine test for starch?

• High concentration of starch

• Absence of starch

• Low concentration of starch

• Presence of starch

What is used to estimate the concentrations of starch and reducing sugars in the experiment?

• Potassium iodide solution

• Benedict’s reagent

• Iodine solution

• Colour standards

What is the risk associated with hot water bath in the experiment?

• Spillage

• Scalding

• Slippery surfaces

• Cuts from sharp objects

What precaution should be taken when handling glassware in the experiment?

• Wipe up any liquid spillages

• Keep away from edge of desk

• Put lids on bottles

• Remove test tubes from the water bath with tongs