Pre-AP Chemistry General Consumable Materials Unit; 12 oz can of regular soda: U4: 2 empty 20 oz bottles: U4: 2 L bottle of regular soda: U4: 4 black pens or markers (for paper chromatography) U2: 9-volt batteries: U2: aluminum foil: U2: antacid tablets (such as Alka-Seltzer) U2, U4: baking soda: U2, U3: black dye/food color: U2: chromatography ... Keep up to date on the latest information from trusted sources, such as WHO or your local and national health authorities. Local and national authorities and public health units are best placed to advise on what people in your area should be doing to protect themselves.