What are the safety rules in a laboratory and methods of separating mixtures, and state Graham's Law of diffusion?

Here are the answers to the questions from the image: 10. Which of the following is not a safety rule in the laboratory? C) Always work alone. Working alone in a laboratory is a safety hazard because there would be no one to assist in case of an accident or emergency. 11. What should one do if there is a chemical spill in the laboratory? A) To inform the laboratory technician. The first and most crucial step is to inform the laboratory technician or supervisor, as they are trained to assess the hazard and direct the appropriate cleanup or emergency procedures. 12. Which of the following is not a method of separating mixtures? C) A mixture of gases or solids substances. Sublimation, filtration, and distillation are all methods of separating mixtures. "A mixture of gases or solids substances" describes a type of mixture, not a method of separation. 13. State Graham's Law of diffusion. Graham's Law of diffusion states that the rate of diffusion or effusion of a gas is inversely proportional to the square root of its molar mass (or density). Rate_1Rate_2 = sqrt((M_2)/(M_1)) where Rate_1 and Rate_2 are the rates of diffusion of two different gases, and M_1 and M_2 are their respective molar masses. --- 11. Why should the emergency exit in a science laboratory be clearly marked? C) To provide a quick escape in case of emergency. Emergency exits are clearly marked to ensure that occupants can quickly and safely evacuate the building during an emergency, such as a fire or chemical spill. 12. Grade 8 learners were learning about evaporation and came across the term solvent. What is a solvent? A) A substance that dissolves another substance. A solvent is a substance, typically a liquid, that dissolves other substances (solutes) to form a solution. 13. Grade 8 learners observed the diagram below while discussing methods of separating homogeneous mixtures. Which method is shown? The diagram illustrates a distillation apparatus, which is used to separate components of a liquid mixture based on differences in their boiling points. The method shown is Distillation. 3 done, 2 left today. You're making progress.