Which of the following statements regarding washing glassware in the organic chemistry lab are true? Select all that apply. 00 When cleaning glassware after using it, always use acetone followed by water. Acetone rinsings should always be disposed in the acetone waste while washing glassware. When cleaning glassware before using it, always use water followed by acetone. Compressed air can be used to dry off remaining acetone. When cleaning glassware after using it, you should rinse with acetone first. Which of the following statements regarding properties of chemicals are false? Select all that apply. Eliminating open flames eliminated all fire hazards in the lab. Organic solvents are always less dense than water. The physical state (ie. solid, liquid or gas) of a chemical is generally unknown. Organic solvents are always miscible with one another. Safety hazards associated with chemicals are included in their safety data sheets (SDS). Which of the following statements regarding general laboratory techniques lab are true? Select all that apply. 00 When weighing solid reagents, the mass of the weigh paper is negligible. When cleaning glassware before using it, always use water first. Measure the pH of a solution by dipping pH paper directly into it. You should never use water when transferring a dried organic solution to a round bottom flask. Single-channel pipette tips are disposed in the glass waste.