Paper Chromatography of Food Dyes (Exp. 3)2023 with 100% correct questions and answers

On the chromatogram above, determine the distance the solvent traveled. 5.50 cm Using the chromatogram above, calculate the Rf for component D. 0.63 Using the chromatogram above, calculate the Rf for component B. 0.71 Why do food dyes absorb visible light? Because they contain long swaths of alternating single and double bonds. Which of the following statement(s) is/are true for the seven FD&C food dyes? Check all that apply. They are water-soluble; They absorb light whose color is complementary to the food dye's color; They contain ions ( = they are salts) Which of the following are natural food dyes? Check all that apply. Anthocyanin; Beta-carotene; Carminic acid What raw material are most synthetic dyes today derived from? Crude oil What is/are the advantage(s) of synthetic food dyes compared to natural food dyes? Check all that apply. Synthetic food dyes are longer lasting; Synthetic food dyes are cheaper to produce; There is no limit to the variety of colors of synthetic food dyes. Which of the following are artificial food dyes? Check all that apply. - Erythrosine - Anthocyanin - Turmeric - Allura Red - Carminic acid - Sunset Yellow Erythrosine; Allura Red; Sunset Yellow Which definition is INCORRECT? - Chronic exposure means coming in direct contact with a toxic chemical repeatedly with a duration measured in months or years. - Acute exposure means coming in direct contact with a toxic chemical only once or repeatedly within 24 hours. - Risk is the probability of suffering harm from being exposed to a hazard or an unsafe situation. - Hazard is an unknown source of danger or harm. Hazard is an unknown source of danger or harm. Why are foods and drinks not allowed in the lab? When consuming foods and drinks you may unknowingly ingest toxic chemicals. Before using a chemical, I must learn its properties and hazards. True Which of the following is NOT a possible way in which chemicals can enter the body? infection A flammable liquid in category 1 is less hazardous than a flammable liquid in category 2. False What should be the very last function performed in the lab before you leave? Wash your hands General guidelines for preventing accidents include: all of the above What is the correct procedure for preparing the dilution of a solution of an acid? add the acid to the water slowly under stirring An SDS includes what information about a chemical? Check all that apply. - Identity - Physical and Chemical properties - Proper storage - Ingredients - Proper disposal - Physical and health hazards What does SDS stand for? Safety Data Sheet Aquatic toxicants Dead Fish with a Tree Corrosives Hand with chemicals being spilt and radio waves Explosives Explosion of a ball Oxidizers Ball on fire Flammables Picture of a fire Gases under pressure Wine bottle on its side Health hazards person with cracked chest Irritants, acute toxicants (harmful) exclamation point