Laboratory Safety: Handling Chemicals and Equipment, Exams of Chemistry

Download Laboratory Safety: Handling Chemicals and Equipment and more Exams Chemistry in PDF only on Docsity! CHEM 101 LAB SAFETY QUIZ 1 – 4 Q & A 2024 Question 1 of 30 2.0/ 2.0 Points When you read the label on a chemical container, what are the three most important pieces of information? The three most important pieces of information are the label name, the concentration and the hazard warning. Question 2 of 30 2.0/ 2.0 Points How many times should you read the information of a chemical container before you open the container? You should read the information twice. The information of a chemical container should be read and reread. Question 3 of 30 2.0/ 2.0 Points Is it important to be exact when preparing a chemical reaction? Explain. Yes, it is very important to be exact when preparing a chemical reaction. It could be dangerous to mix the wrong amounts of chemicals. Also, it is important to measure exactly what you need, so you do not waste any chemicals. Question 4 of 30 2.0/ 2.0 Points What should you do with leftover chemicals after an experiment? What should you do with the products of an experiment? You should dispose of it in a specific container. There is also specific waste containers for products. Non-hazardous products can be placed in the trashcan. You should never return unused reagents to stock bottles. Solids can be placed in plastic waste buckets. The waste containers should all be closed. Glass must be discarded in specially designed containers. Question 5 of 30 2.0/ 2.0 Points How can you draw small volumes of liquids into a pipette safely? You should draw small volumes with a pipette bulb not with the mouth of the pipette. Question 6 of 30 2.0/ 2.0 Points Why is it important to read instructions all the way through before beginning an experiment? It is important to read instructions all the way through to know all the steps before performing them. It is important to be aware of the steps to fully understand the experiment. Also, the timing of when chemicals react may be quick, so it is important to know when things occur. Name 1 precaution that you should take when working near heated objects. One precaution should be with long hair. If you are working near heated objects and a bunsen burner, it is important to keep long hair pulled back. The heated objects can burn your hair or skin. Question 15 of 30 2.0/ 2.0 Points Is it safe to use glassware that has cracks or chips? Explain. It is not safe to use glassware that has cracks or chips because they can break when heated. The glassware must fully be intact for it to be used correctly and successfully. Question 16 of 30 2.0/ 2.0 Points How can you safely carry a heated object? A heated object can be safely carried in special gloves (hot mitts), or by using beaker tongs and carrying the heated object. Question 17 of 30 2.0/ 2.0 Points Is it safe to heat flammable chemicals with a Bunsen burner? It is not safe to heat flammable chemicals with a Bunsen burner. This could cause an explosion. Part 3 of 5 - Thermometer Safety 6.0/ 6.0 Points Question 18 of 30 2.0/ 2.0 Points What should you avoid doing with a thermometer in the lab that you might do with a medical thermometer used to take a person’s temperature? Why? You should avoid shaking the thermometer. It is unnecessary and can be dangerous. The liquid inside can move around without shaking. Question 19 of 30 2.0/ 2.0 Points What temperature range are you usually working within during General Chemistry lab? The temperature range is usually around 120 degrees Celsius to -120 degrees Celsius. Question 20 of 30 2.0/ 2.0 Points Before choosing a thermometer for a specific job, what should you know? You should know the type of thermometer you need. You should also know the specific temperature range for that thermometer, so you do not cause the thermometer to shatter from excessive heat. Part 4 of 5 - Dressing for Safety 12.0/ 12.0 Points Question 21 of 30 2.0/ 2.0 Points What types of shoes are appropriate for the lab? Shoes must cover the entire foot in lab. Closed, leather shoes are best for lab. Other shoes may absorb chemicals. Question 22 of 30 2.0/ 2.0 Points Describe the type of clothing you should wear on days when you will be working in the lab. You should wear clothes that stay out of your way in lab. Your clothing should also protect you from chemicals. You should wear clothing with sleeves. However, the shirts should be somewhat fitted. It should be made out of certain materials, because if it were to catch on fire, it will not harm you. Question 23 of 30 2.0/ 2.0 Points How should you protect your eyes from chemicals and glass shards? Your eyes should be covered with goggles that have side shields. Question 24 of 30 2.0/ 2.0 Points Why is it important to remove rings, watches and contact lenses before working in the lab? It can attract corrosive chemicals on your skin, and it can also damage your jewerly. Contact lenses can attract chemical vapors against your eyes. Your eyes may spasm, and that would make it impossible to take out the lenses. Question 25 of 30 2.0/ 2.0 Points How can you protect your hands when working with chemicals? You can wear gloves to protect your hands. Also keep your hands away from the nozzle while pouring to prevent spills onto your hands. It is important to ask your teacher what type of 1. You are working in a chemistry lab and you need to measure 50 mL of concentrated sulfuric acid. Which of the following is the most appropriate equipment to use? a) A graduated cylinder b) A volumetric flask c) A pipette* d) A beaker Rationale: A pipette is the most accurate and precise instrument for measuring small volumes of liquids. A graduated cylinder and a volumetric flask are less accurate and precise, and a beaker is the least accurate and precise. 2. You are performing a titration experiment and you accidentally spill some of the acid solution on your hand. What should you do immediately? a) Wash your hand with soap and water b) Neutralize the acid with a base c) Rinse your hand with plenty of water* d) Apply a bandage to your hand Rationale: The first aid for acid spills is to rinse the affected area with plenty of water for at least 15 minutes. Washing with soap and water or neutralizing with a base may cause more damage to the skin. Applying a bandage may trap the acid and prevent proper rinsing. 3. You are heating a test tube that contains a liquid over a Bunsen burner. Which of the following is the correct way to hold the test tube? a) Horizontally, pointing away from yourself and others b) Vertically, pointing towards yourself c) Horizontally, pointing towards yourself d) Angled, pointing away from yourself and others* Rationale: The test tube should be held at an angle, pointing away from yourself and others, to avoid splashing or boiling over of the liquid. Holding the test tube horizontally or vertically may cause the liquid to spill out or shoot out of the tube. 4. You are using a hot plate to heat a solution in a beaker. You notice that the solution is boiling vigorously and you need to turn off the hot plate. Which of the following is the safest way to do so? a) Use your bare hand to turn off the switch b) Use a pair of tongs to turn off the switch c) Use a glove or a cloth to turn off the switch* d) Use a metal spatula to turn off the switch Rationale: The hot plate may be very hot and cause burns if touched with bare hands or metal objects. A glove or a cloth can provide insulation and protection from the heat. A pair of tongs may not be able to grip the switch properly and may cause sparks or electric shocks. 5. You are working with flammable solvents in a chemistry lab. Which of the following is a potential fire hazard that you should avoid? a) Wearing loose clothing or jewelry b) Storing the solvents in glass bottles c) Using a fume hood or a well-ventilated area d) Having an open flame or a spark source nearby* Rationale: Flammable solvents can easily catch fire if exposed to an open flame or a spark source, such as a Bunsen burner, a lighter, or an electrical outlet. Wearing loose clothing or jewelry, storing the solvents in glass bottles, and using a fume hood or a well-ventilated area are not fire hazards, but rather good practices for working with flammable solvents. 6. You are cleaning up after an experiment and you need to dispose of some chemical waste. Which of the following is the best way to do so? a) Pour it down the sink with plenty of water b) Throw it in the regular trash bin c) Mix it with other chemical waste in a common container d) Follow the instructions on the label or ask your instructor* Rationale: Different chemicals may have different disposal methods depending on their properties, hazards, and regulations. Pouring them down the sink, throwing them in the trash, or mixing them with other chemicals may cause environmental damage, health risks, or chemical reactions. The best way to dispose of chemical waste is to follow the instructions on the label or ask your instructor for guidance. 7. You are preparing a solution of sodium hydroxide (NaOH), which is a strong base, by dissolving solid pellets in water. Which of the following is the correct order of steps to do so? a) Add water to NaOH pellets, stir well, and transfer to a volumetric flask b) Add NaOH pellets to water, stir well, and transfer to a volumetric flask* c) Add NaOH pellets to water, transfer to a volumetric flask, and stir well d) Add water to NaOH pellets, transfer to a volumetric flask, and stir well Rationale: The correct order of steps is to add NaOH pellets to water, stir well, and transfer to a volumetric flask. This is because adding water to NaOH pellets may cause a rapid and exothermic reaction that can generate heat, steam, and splashes. Adding NaOH pellets to water allows for better control and safety. 8. You are wearing a pair of safety goggles in a chemistry lab. Which of the following is a situation where you should keep your goggles on? a) When you are done with your experiment and you are cleaning up b) When you are observing another group's experiment from a distance c) When you are leaving the lab for a short break d) All of the above* Rationale: You should keep your goggles on at all times when you are in the lab, even when you are not actively working fume hood or a well-ventilated area reduces inhalation and accumulation of vapors. Which of the following is the most appropriate attire for a chemistry laboratory? a) Open-toed sandals b) Shorts and a tank top c) Long pants and closed-toe shoes d) Sleeveless shirt and flip-flops Answer: c) Long pants and closed-toe shoes Rationale: Long pants and closed-toe shoes provide protection against chemical spills and potential burns. What is the first action to take in the event of a chemical spill on the skin? a) Rinse the affected area with water for at least 15 minutes b) Apply a neutralizing agent immediately c) Cover the spill with a towel d) Wipe the spill with a dry cloth Answer: a) Rinse the affected area with water for at least 15 minutes Rationale: The immediate rinsing of the affected area helps to minimize the chemical's contact with the skin, preventing further damage. When working with volatile chemicals, what precaution should be taken in the laboratory? a) Keep the windows closed to maintain a controlled environment b) Ensure proper ventilation c) Use the chemicals quickly to minimize exposure d) Work close to an open flame Answer: b) Ensure proper ventilation Rationale: Proper ventilation helps to reduce the concentration of volatile chemicals in the laboratory, minimizing the risk of inhalation. What should be done before using any glassware in the laboratory? a) Inspect for cracks or chips b) Heat the glassware to sterilize c) Rinse with water only d) Use without inspection Answer: a) Inspect for cracks or chips Rationale: Inspecting glassware for damage ensures its integrity and prevents potential accidents due to compromised equipment. Which of the following is an appropriate action to take with electrical cords in the laboratory? a) Place cords under rugs to prevent tripping hazards b) Tape cords to the floor c) Keep cords away from walkways d) Bundle multiple cords together Answer: c) Keep cords away from walkways Rationale: Keeping cords away from walkways reduces the risk of tripping and potential electrical accidents. What should be used to extinguish a small fire in a laboratory setting? a) Water b) Fire blanket c) Fire extinguisher d) Paper towels Answer: c) Fire extinguisher Rationale: A fire extinguisher is the appropriate tool to use for extinguishing small fires in a laboratory, as it is designed for different types of fires. What is the correct procedure for smelling a chemical in the laboratory? a) Waft the chemical towards the nose with the hand b) Inhale deeply over the container c) Pour a small amount on the palm and smell closely d) Ignore the smell of chemicals Answer: a) Waft the chemical towards the nose with the hand Rationale: Wafting the chemical allows for a gentle introduction of the odor, minimizing the risk of inhaling harmful fumes. What should be worn when handling chemicals that pose a risk of eye exposure? a) Safety goggles b) Reading glasses c) Sunglasses d) Contact lenses Answer: a) Safety goggles Rationale: Safety goggles provide protection against chemical splashes and fumes, reducing the risk of eye injuries. How should chemical waste be disposed of in the laboratory? a) Pour down the sink with plenty of water b) Place in regular trash bins c) Follow proper waste disposal guidelines d) Store in the laboratory for future use Answer: c) Follow proper waste disposal guidelines Rationale: Following proper waste disposal guidelines ensures that hazardous waste is handled and disposed of safely and responsibly. What action should be taken if a lab experiment is not understood? a) Proceed with the experiment and figure it out as you go b) Ask a lab partner for help c) Consult the lab manual or instructor for clarification d) Skip the experiment entirely Answer: c) Consult the lab manual or instructor for 2. What is the correct procedure for handling broken glassware in the laboratory? a) Pick up the broken pieces with bare hands and dispose of them in the nearest bin. b) Use a dustpan and brush to collect the broken glass pieces and dispose of them in a designated sharps container. c) Ignore the broken glass and continue with the experiment. d) Sweep the broken glass pieces onto the floor and inform the instructor at the end of the experiment. Answer: b) Use a dustpan and brush to collect the broken glass pieces and dispose of them in a designated sharps container. Rationale: Broken glass can cause injuries, and handling it with bare hands can result in cuts and puncture wounds. Using a dustpan and brush is the correct method for collecting broken glass, ensuring safe disposal in a designated sharps container. 3. What is the purpose of a fume hood in a laboratory? a) To provide additional lighting during experiments b) To keep the laboratory bench clean and organized c) To prevent exposure to toxic gases, vapors, and small particles d) To minimize temperature fluctuations in the laboratory Answer: c) To prevent exposure to toxic gases, vapors, and small particles Rationale: Fume hoods are designed to protect laboratory personnel from inhalation of toxic or hazardous substances by maintaining a controlled airflow that carries away fumes, gases, and small particles that may be generated during experiments. 4. Which of the following is an essential practice to promote laboratory safety when conducting experiments involving flammable substances? a) Use a gas burner near open containers of flammable substances. b) Ensure all flammable substances are stored in refrigerators. c) Use spark-resistant tools and equipment in the vicinity of flammable substances. d) Wear gloves made of latex or vinyl to handle flammable substances. Answer: c) Use spark-resistant tools and equipment in the vicinity of flammable substances. Rationale: Spark-resistant tools and equipment, such as those made of brass or non-sparking alloys, are necessary when working with flammable substances to prevent the ignition of the substance due to sparks caused by friction or impact. 5. What does the acronym "MSDS" stand for in laboratory safety? a) Multiple Scientific Data Sheets b) Material Safety Data Sheets c) Mandatory Security Data Sheets d) Master Safety Data Sheets Answer: b) Material Safety Data Sheets Rationale: Material Safety Data Sheets (MSDS) provide detailed information about the properties, handling, storage, and emergency procedures associated with hazardous substances. They are essential resources for understanding and managing the risks associated with chemicals in the laboratory. 6. What are the appropriate measures to be taken if a chemical spill occurs on the laboratory bench? a) Wipe up the spill with a paper towel and dispose of it in a regular trash bin. b) Leave the spill as it is and inform the instructor at the end of the experiment. c) Absorb the spill using appropriate absorbent materials, dispose of it in chemical waste containers, and clean the area with suitable cleaning agents. d) Pour water over the spilled chemical to dilute it and make it easier to clean. Answer: c) Absorb the spill using appropriate absorbent materials, dispose of it in chemical waste containers, and clean the area with suitable cleaning agents. Rationale: Chemical spills can pose immediate risks to laboratory personnel and the environment. The correct action is to absorb the spill using appropriate absorbent materials, dispose of the contaminated materials in designated waste containers, and clean the area thoroughly using suitable cleaning agents. 7. What is the first step to be taken in the event of a laboratory fire? a) Evacuate the laboratory immediately and raise the alarm. b) Attempt to extinguish the fire using the nearest available fire extinguisher. c) Cover the burning area with a fire blanket. d) Shut off all gas valves and electrical connections. Answer: a) Evacuate the laboratory immediately and raise the alarm. Rationale: In case of a laboratory fire, the safety of individuals is prioritized. Therefore, the first step is to evacuate the laboratory, ensuring that everyone is safely out of harm's way, and then raise the alarm to inform appropriate emergency response personnel. 8. What is the purpose of conducting a risk assessment before starting a laboratory experiment? a) To identify potential hazards and assess their severity b) To determine the cost of the experiment c) To predict the final outcome of the experiment d) To evaluate the difficulty level of the experiment Answer: a) To identify potential hazards and assess their appropriate instructions should be followed for decontamination. 13. Which of the following is an effective method to extinguish a small, minor fire in the laboratory? a) Pouring water directly on the fire b) Using carbon dioxide (CO2) fire extinguisher c) Blowing on the fire to reduce the flames d) Smothering the flames with a flammable liquid Answer: b) Using carbon dioxide (CO2) fire extinguisher Rationale: When dealing with small, minor fires in the laboratory, the most appropriate method of extinguishing the fire is by using a carbon dioxide (CO2) fire extinguisher. CO2 displaces oxygen and removes heat, effectively suppressing the fire without leaving any residue behind. 14. What is the purpose of an emergency eyewash station in the laboratory? a) To provide a source of drinking water during experiments b) To rinse laboratory equipment after use c) To flush the eyes in the event of chemical or foreign object contamination d) To wash hands and face after handling hazardous substances Answer: c) To flush the eyes in the event of chemical or foreign object contamination Rationale: Emergency eyewash stations are designed to provide immediate flushing of the eyes with a continuous flow of water in case of chemical splashes or foreign object contamination. This helps to minimize the potential damage or injury caused to the eyes. 15. Which of the following is a crucial step before handling any laboratory equipment or chemicals? a) Ensuring personal protective equipment (PPE) is worn correctly b) Taking a break to relax and clear the mind c) Draining all liquid from the equipment d) Testing the accuracy of the equipment Answer: a) Ensuring personal protective equipment (PPE) is worn correctly Rationale: Before handling any laboratory equipment or chemicals, it is essential to ensure personal protective equipment (PPE) is worn correctly. PPE, including lab coats, gloves, goggles, or any other necessary equipment, should always be used to protect against potential hazards and minimize risks during experiments.