LABORATORY MIDTERM EXAM
Quiz by Angelo Carlo Gulanes
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- Q1
What is the purpose of adding bromine in CCl4 during the test for unsaturation?
To react with unsaturated compounds
To dissolve the substances
To enhance the color of the substances
To increase the density of the substances
30s - Q2
Which substances were prepared for the test for unsaturation in the laboratory activity?
Olive oil, oleic acid, vegetable oil, coconut oil
Hydrochloric acid, sulfuric acid, nitric acid, acetic acid
Water, salt, sugar, vinegar
Ethanol, methanol, propanol, butanol
30s - Q3
Why is it important to prevent cross-contamination of samples during the test?
To make the samples taste better
To reduce waste
To save time
To obtain accurate results for each substance
30s - Q4
What is the purpose of recording the number of bromine drops consumed in each test?
To determine the density of the substances
To calculate the volume of CCl4 used
To estimate the cost of the experiment
To measure the degree of unsaturation in each substance
30s - Q5
Which substance is commonly used as a cooking oil and was likely to react with bromine in the test?
Vegetable oil
Salt
Sugar
Water
30s - Q6
What does it mean if a substance consumes a large number of bromine drops during the test?
The substance is not suitable for the test
The substance is a strong acid
The substance is a solid
The substance is highly saturated
30s - Q7
Which of the following substances would most likely show the least degree of unsaturation in the test?
Vegetable oil
Oleic acid
Coconut oil
Olive oil
30s - Q8
What type of information does recording the number of bromine drops consumed provide about a substance?
Its color
Its level of unsaturation
Its taste
Its density
30s - Q9
What is the purpose of step 1 in the soap preparation process?
To weigh coconut oil
To prepare a detergent solution
To test for saponification
To mix the soap ingredients
30s - Q10
What is the purpose of pouring the soap mixture into a mold in step 3?
To create a detergent solution
To allow the soap to set
To test the pH
To rinse the soap
30s - Q11
In soap preparation, what indicates that saponification is complete?
The mixture becomes clear
The mixture produces suds and no oily globules form
The mixture turns red
The mixture solidifies instantly
30s - Q12
In Part III, what is the purpose of preparing a solution of powdered detergent in step 1?
To compare properties of soap and detergent
To rinse out soap from the container
To weigh the detergent
To test the pH of the soap
30s - Q13
How does the purpose in soap preparation (weighing coconut oil) relate to the overall process?
Weighing coconut oil is done to test the pH.
Weighing coconut oil is a necessary step to ensure the right amount of oil for saponification.
Weighing coconut oil is necessary to prepare the detergent solution.
Weighing coconut oil is unrelated to the soap preparation process.
30s - Q14
Why is it important to stir continuously in one direction during the saponification process?
It helps dissolve the oil in water
It prevents the formation of suds
It promotes even mixing and reaction.
It speeds up the cooling process
30s - Q15
How does the result of the saponification test relate to the quality of the soap being produced?
The test only measures the soap's color.
A positive result (suds, no oily globules) indicates successful saponification and quality soap.
The test result has no relation to soap quality.
A negative result indicates high soap quality
30s