Podcast
Questions and Answers
What is the base unit for measuring mass in the metric system?
What is the base unit for measuring mass in the metric system?
- Gram (correct)
- Liter
- Celsius
- Meter
Which measuring device is commonly used for measuring volume in liters?
Which measuring device is commonly used for measuring volume in liters?
- Thermometer
- Graduated cylinder (correct)
- Ruler
- Electronic balance
Which prefix in the metric system represents one-thousandth of a unit?
Which prefix in the metric system represents one-thousandth of a unit?
- Deci-
- Milli- (correct)
- Cent-
- Kilo-
What is the standard base unit for measuring length in the metric system?
What is the standard base unit for measuring length in the metric system?
What should you avoid when measuring with a ruler to ensure accuracy?
What should you avoid when measuring with a ruler to ensure accuracy?
Which of the following prefixes indicates a quantity of ten?
Which of the following prefixes indicates a quantity of ten?
Which temperature unit is commonly used in scientific measurements?
Which temperature unit is commonly used in scientific measurements?
What is the unit symbol for mass in the metric system?
What is the unit symbol for mass in the metric system?
What should you do if chemicals splash onto your skin or into your eyes during a lab?
What should you do if chemicals splash onto your skin or into your eyes during a lab?
Why is it important to know the location of safety equipment like fire extinguishers and eyewash stations before starting a lab?
Why is it important to know the location of safety equipment like fire extinguishers and eyewash stations before starting a lab?
What precautions should you take when handling chemicals in the lab?
What precautions should you take when handling chemicals in the lab?
How should sharp objects or biohazardous waste materials be disposed of in the lab?
How should sharp objects or biohazardous waste materials be disposed of in the lab?
Why is it important to never eat, drink, or apply cosmetics in the laboratory?
Why is it important to never eat, drink, or apply cosmetics in the laboratory?
What is the primary focus of biology as a field of study?
What is the primary focus of biology as a field of study?
Which of the following describes the role of biologists?
Which of the following describes the role of biologists?
What should you do immediately after a spill occurs in the laboratory?
What should you do immediately after a spill occurs in the laboratory?
What should you do if you are unsure about any part of the laboratory investigation?
What should you do if you are unsure about any part of the laboratory investigation?
Which of the following is NOT a general laboratory safety guideline?
Which of the following is NOT a general laboratory safety guideline?
What should be done immediately if you break a glass item in the lab?
What should be done immediately if you break a glass item in the lab?
Why is it important to remove large jewelry and tie back long hair in the lab?
Why is it important to remove large jewelry and tie back long hair in the lab?
What should you do with materials that have come into contact with biohazardous waste?
What should you do with materials that have come into contact with biohazardous waste?
Which safety equipment should be worn when instructed during lab activities?
Which safety equipment should be worn when instructed during lab activities?
How should you prepare before arriving at the laboratory?
How should you prepare before arriving at the laboratory?
What requirement must be fulfilled before handling laboratory equipment?
What requirement must be fulfilled before handling laboratory equipment?
What instrument is most commonly used to measure mass?
What instrument is most commonly used to measure mass?
How should the meniscus be read when measuring the volume of a liquid?
How should the meniscus be read when measuring the volume of a liquid?
Which method is appropriate for calculating the volume of a wooden block?
Which method is appropriate for calculating the volume of a wooden block?
What is the freezing point of water in Celsius?
What is the freezing point of water in Celsius?
When measuring with a ruler, how should you handle significant figures?
When measuring with a ruler, how should you handle significant figures?
What is the primary use of a graduated cylinder?
What is the primary use of a graduated cylinder?
What is a correct conversion formula between Celsius and Fahrenheit?
What is a correct conversion formula between Celsius and Fahrenheit?
Which is NOT a tool used for measuring weight or mass?
Which is NOT a tool used for measuring weight or mass?
Which variable is considered independent in an experiment testing bacterial growth?
Which variable is considered independent in an experiment testing bacterial growth?
What is the dependent variable in the context of bacterial growth experiments?
What is the dependent variable in the context of bacterial growth experiments?
Which of the following would be a controlled variable in an experiment on bacterial growth?
Which of the following would be a controlled variable in an experiment on bacterial growth?
What aspect of the experiment could be altered to improve reliability of results?
What aspect of the experiment could be altered to improve reliability of results?
When conducting a control test, what is being measured?
When conducting a control test, what is being measured?
If you observe that the dish with the highest temperature had the least bacterial growth, what can be inferred?
If you observe that the dish with the highest temperature had the least bacterial growth, what can be inferred?
During the experiment, why is it important to estimate bacterial growth as a percentage?
During the experiment, why is it important to estimate bacterial growth as a percentage?
Which of the following statements about antibacterial agents is correct in an experimental context?
Which of the following statements about antibacterial agents is correct in an experimental context?
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Study Notes
Lab Safety
- Students should familiarize themselves with lab safety rules and the location of safety equipment.
- Before entering the lab, students must turn off their cell phones, tie back long hair, remove large jewelry, and wear appropriate attire (closed-toe shoes and lab coat).
- Students must carefully read and follow all instructions provided by the instructor and seek clarification if needed.
- Always use proper techniques and protection when handling chemicals, and ensure that any spills are reported to the instructor.
- Students should always wear gloves and safety goggles when handling chemicals.
- Never directly smell or mouth pipette any chemicals.
- Dispose of all used sharp objects and biohazardous waste materials in designated containers.
- Wash hands before and after lab investigations.
- Be aware of the locations of safety equipment such as fire extinguishers, fire blankets, first-aid kits, safety showers, and eyewash stations.
Introduction to Biology and The Scientific Method
- Biology involves observation, experimentation, and explanation of living phenomena.
- Students are tasked with designing an experiment to explore the effects of antibacterial agents or temperature on bacterial growth.
- Key steps in the scientific method include formulating a question, developing a hypothesis, identifying independent and dependent variables, and controlling variables.
- The independent variable is the factor being manipulated or changed in the experiment, while the dependent variable is the outcome being measured.
- Controlled variables are kept constant to ensure a fair comparison.
Scientific Measurements
- The metric system is used for scientific measurements, using base units like meters for length, grams for weight/mass, and liters for volume.
- Length is measured using rulers, focusing on precision and recording all known digits and the first uncertain digit.
- Weight/mass is measured using balances, such as triple-beam balances or top-loading scales.
- Liquid volume is measured using graduated cylinders or pipettes, reading the volume at the bottom of the meniscus.
- Solid object volume can be calculated using formulas, for example, volume of a wooden block = length x width x depth.
- Temperature is measured using scientific thermometers calibrated in Celsius (°C), with water boiling at 100 °C and freezing at 0 °C.
- Formulas exist to convert between Celsius and Fahrenheit scales.
- When taking measurements, students should use significant figures, recording all known digits and the first uncertain digit.
Taking Measurements
- Students are tasked with measuring the length and width of different geometric shapes using a metric ruler.
- Measurements must be recorded using significant figures.
- The area of the geometric shapes needs to be calculated using the measurements obtained, and the formula area = width x length.
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