
LABORATORY MIDTERM EXAM
Quiz by Angelo Carlo Gulanes
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What is the purpose of adding bromine in CCl4 during the test for unsaturation?
Which substances were prepared for the test for unsaturation in the laboratory activity?
Why is it important to prevent cross-contamination of samples during the test?
What is the purpose of recording the number of bromine drops consumed in each test?
Which substance is commonly used as a cooking oil and was likely to react with bromine in the test?
What does it mean if a substance consumes a large number of bromine drops during the test?
Which of the following substances would most likely show the least degree of unsaturation in the test?
What type of information does recording the number of bromine drops consumed provide about a substance?
What is the purpose of step 1 in the soap preparation process?
What is the purpose of pouring the soap mixture into a mold in step 3?
In soap preparation, what indicates that saponification is complete?
In Part III, what is the purpose of preparing a solution of powdered detergent in step 1?
How does the purpose in soap preparation (weighing coconut oil) relate to the overall process?
Why is it important to stir continuously in one direction during the saponification process?
How does the result of the saponification test relate to the quality of the soap being produced?
How does the pH test relate to the comparison of soap and detergent properties?
How does the rinsing of the soap container relate to the overall safety and disposal of laboratory materials?
In soap preparation process, why is it important to rinse out the remaining soap from the container with 50 mL of distilled water?
What is the primary objective of testing the pH of the soap and detergent solutions?
How does the result of the pH test relate to the cleaning effectiveness of soap and detergent?
In the procedure to test the protein nature of enzymes, what is added to 5 mL of the catalase extract?
What is the purpose of adding water to the grated potato in the procedure?
What is the purpose of straining the potato-water mixture through cheesecloth in the procedure?
If filtering through filter paper takes too long in the procedure, what alternative material can be used?
In the final step of the procedure, what is the purpose of mixing 5 mL of the filtrate with 5 mL of 6% H2O2 and inserting a glowing wooden splint?
What is the purpose of mixing 1 mL of 0.05 N HCl with saliva in Test Tube 1 of the procedure?
Which substance is added to Test Tube 2 in the procedure to create a neutral pH environment?
What is the purpose of placing the test tubes in a water bath maintained at body temperature (37°C) in the procedure?
What is the indicator used to determine the completion of the reaction in the procedure for testing the effect of pH on enzyme activity?
What would be the expected outcome if, instead of 0.05 N NaOH, a strong acid like 0.1 N HCl were added to Test Tube 3 in the lab activity?
How would the results differ if the water bath temperature was lowered to 10°C instead of maintaining it at body temperature (37°C) during the experiment?
If the saliva used in the experiment was preheated to 70°C before being added to the test tubes, what impact would this have on starch hydrolysis?
What additional control could be included in the experimental design to ensure the observed changes are solely due to pH effects and not other factors?
If the concentration of the enzyme is doubled while keeping the temperature and pH constant, how would this affect the time required for starch hydrolysis to be complete?
Which of the following best explain why the disappearance of the blue-black color in the iodine solution is considered a reliable indicator of complete starch hydrolysis
Considering the influence of temperature, predict the effect of raising the water bath temperature from 37°C to 50°C on the rate of starch hydrolysis.
What does the disappearance of the blue-black color in the iodine solution indicate in the context of starch hydrolysis?
What is the purpose of recording the time in the experiment?
Why is it mentioned that the time for starch hydrolysis may vary depending on factors such as temperature and pH?
What is the primary purpose of maintaining the water bath at body temperature during the experiment?
What is the reactant in the catalase-catalyzed reaction described by the equation as shown

What is the role of catalase in the given reaction equation?

How many molecules of oxygen (Oâ‚‚) are produced in the catalase-catalyzed reaction when 2 molecules of hydrogen peroxide (Hâ‚‚Oâ‚‚) react?

What are the products formed as a result of the catalase-catalyzed reaction?

What is the primary function of catalase in the context of the hydrogen peroxide decomposition reaction?
Why is catalase considered a biological catalyst in the given context?
What is the optimal pH range for most enzymes to function efficiently?
In the context of enzyme activity, what term is used for molecules that enhance the enzyme's activity?
What is the impact of increasing enzyme concentration on the rate of enzymatic reaction?
Which molecules can reduce enzyme activity by binding to the enzyme?