decay

• What is the main focus of the practical described in the video?

  Investigating temperature's effect on milk decay
• Why does milk sour when left at room temperature?

  Bacteria produce acidic molecules during decay
• What enzyme is used to model decay in the experiment?

  Lipase
• What does the indicator cresol red indicate in the experiment?

  It changes color based on acidity
• What color does cresol red turn in acidic conditions?

  Yellow
• What is the purpose of sodium carbonate in the experiment?

  To create an alkaline environment
• What is the first temperature used in the experiment?

  20 degrees Celsius
• What is the independent variable in this experiment?

  Temperature
• What is the dependent variable in this experiment?

  Time taken for milk to turn yellow
• What are the control variables in this experiment?

  Volumes of all solutions used
• Why is it important to use a clean test tube for each experiment?

  To avoid triggering reactions prematurely
• How can the difficulty of timing the color change be reduced?

  By sharing data and calculating a mean
• What happens to enzyme activity at lower temperatures?

  Reactions occur slowly
• What is the optimum temperature for enzyme reactions?

  The temperature at which reactions are fastest
• What happens to enzymes at temperatures higher than optimum?

  They denature and may stop working
• How do decomposing microorganisms behave in warm conditions?

  They work faster but not in hot conditions
• What is the significance of the practical described?

  It helps understand decay and enzyme activity
• What should students expect in their vision workbook?

  Questions on the required practical
• Why is measuring pH change important in the experiment?

  It indicates the acidity of the milk
• What role do enzymes play in the decay process?

  They break down substances, causing decay
• Why is a timer used in the experiment?

  To measure the time for color change
• How does temperature affect enzyme denaturation?

  Higher temperatures can denature enzymes
• What is the relationship between enzyme activity and temperature?

  Enzyme activity increases with temperature to a point
• Why is accurate data collection important in scientific experiments?

  It ensures reliable and valid results