Which of the following is not a safe lab procedue? Label all containers before filling them with a solution, liquid or solid. Label all containers before filling them with a solution, liquid or solid. When noting the odor of a chemical, waft the fumes toward your nose. When noting the odor of a chemical, waft the fumes toward your nose. Use a spatula or tweeezers to pick up solids. Use a spatula or tweeezers to pick up solids. Pour all chemicals down the drain when cleaning up. Pour all chemicals down the drain when cleaning up. Please answer