Q1M3: Laboratory Safety Precautions, Rules, Techniques

• What should you do before proceeding to the next task?

  Finish the task at hand
• What should you do with this module once you are through with it?

  Return it to your teacher/facilitator
• What should you do if you encounter difficulties in answering the tasks in this module?

  Consult your teacher or facilitator
• What is the purpose of this module?

  To help you master Chemistry Laboratory Safety Precautions, Rules, and Techniques
• What are the expected outcomes after going through this module?

  • Familiarity with chemistry laboratory rules and safety precautions
  • Ability to explain the rules for safety in the chemistry laboratory
• What are the two lessons included in this module?

  1. Chemistry Laboratory Safety Precautions
  2. Chemistry Laboratory Rules and Techniques
• What is the focus of Lesson 3 in this module?

  Chemistry Laboratory Safety Precautions
• What is the focus of Lesson 4 in this module?


  Chemistry Laboratory Rules and Techniques
• What should you be able to determine after completing Lesson 4?


  The basic techniques and common operations used in the chemistry laboratory
• Why is it important to follow proper laboratory techniques?

  To avoid accidents and achieve maximum efficiency
• What type of question format is used in the "What I Know" section?

  Multiple choice questions
• What is the laboratory symbol for ionizing substances?

  1. Ionizing radiation hazard
• Where should your eyes be positioned when reading the measurement of a volume using a graduated cylinder?

  Directly to the level of the meniscus of liquid inside the graduated cylinder
• What is the purpose of an evaporating dish in the laboratory?

  It is used for evaporation
• What laboratory technique do Fractioning flask and condenser perform?

  Distillation
• How should Claire determine the odor of the chemical substance she was using?

  Gently fan the vapors towards her nostrils and sniff the fumes
• Which symbol is NOT intended for laboratory safety?

  1. (the symbol not specified)
• What is required for an ideal laboratory?

  It should be equipped with scientific apparatus and equipment
• What are the two classifications of laboratory apparatuses?

  Glass wares and metal equipment
• What type of glass is recommended for advanced experimentation?

  Boro-aluminosilicate glass
• What are the two groups of glass wares?

  Volumetric glasswares and Non-Volumetric glasswares
• What is the function of volumetric glasswares?

  To measure the amount of liquids accurately and precisely
• What is the function of non-volumetric glasswares?

  To contain, mix, heat, stir, and transfer solutions/substances
• What is the role of metal equipment in experiments?

  To support, hold, and maintain the stability of porcelain and glass wares
• What is the importance of heating apparatuses in laboratory processes?

  They are essential for administering different processes
• What should you use to support/protect glass wares in direct contact with heat?

  Wire gauze or clay triangle
• What are the rules and safety precautions to be observed in the laboratory?

  1. Personal Safety

  • Use safety goggles and laboratory gown
  • Tie back long hair
  • Wear closed shoes
  • Wash hands before and after activities

  
  

  1. Safe Laboratory Techniques

  • Read and understand all steps before activities
  • Perform assigned activities with supervision
  • Use suction bulbs for pipetting

  
  

  1. Safety in using Laboratory Equipment

  • Know the location of safety equipment
  • Use hot plates for flammable liquids
  • Clean and return all equipment used

  
  

  1. Safe Disposal of Glasswares or Chemicals

  • Dispose of broken glassware properly
  • Neutralize acids before disposal
  • Do not throw solid wastes in the sink
• What is the first step in measuring the volume of liquids using a graduated cylinder?

  Position your eye with reference to the meniscus
• What should be the eye level when reading the volume in a graduated cylinder?

  At the level of the meniscus
• What happens if your eye is above the meniscus when reading the volume?

  The volume reading is too low
• What happens if your eye is below the meniscus when reading the volume?

  The volume reading is too high
• What is the purpose of rinsing a pipette before use?

  To ensure accurate measurement of the liquid
• What should you do after rinsing the pipette?

  Add enough liquid to fill the pipette above the mark
• How should you hold the pipette while drawing liquid?

  Hold it vertically
• What should you use to maintain the liquid level in the pipette?

  Use your index finger
• What should you do with any spills on the outside surface of the pipette?

  Wipe them off
• What is the first step in heating liquids using a test tube?

  Pour the desired amount of liquid into the test tube
• How much liquid should be in the test tube when heating?

  Only half the length of the test tube
• How should you hold the test tube while heating?

  At an angle of 45°
• What should you never do while heating a test tube?


  Look directly into the tube