Christina _Lab Workbook - Unit 1 - Viscosity of Liquids (4) (1)

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Unit 1 Lab - Viscosity of Liquids - Lab Workbook PRE-LAB QUESTIONS 1. What is the relationship between viscosity and intermolecular forces? Viscosity is a measure of a fluid's resistance to flow, and intermolecular forces are attractive or repulsive forces that exist between molecules. The relationship between viscosity and intermolecular forces is influenced by how these forces affect the movement of molecules within a fluid. This means that stronger forces contribute to higher viscosity, while weaker forces lead to lower viscosity. 2. For each of the following molecules list the intermolecular forces present. Water (H 2 O)- Hydrogen Bonding Butane (C 4 H 10 )- London dispersion force Acetone (C 2 H 6 O)- Dipole-dipole Interaction and London Dispersion Force 3. Based on the intermolecular forces you listed above, put the molecules in order of increasing viscosity. Water (H2O)> Acetone (C2H6O)>Butane (C4H10) EXPERIMENT 1: VISCOSITY AT ROOM TEMPERATURE Data Sheet Table 1: Time for marble to drop through each substance Substance Height of solution (cm) Time (seconds) Trial 1 Time (seconds) Trial 2 Time (seconds) Trial 3 Average Time (seconds) Water 5cm .20 sec .24 sec .23 sec 0.22 sec Vegetable Oil 5cm .30 sec .33 sec .35 sec 0.33 sec Honey 5cm 17.18 sec 17.16 sec 18.04 sec 17.46 sec
Unit 1 Lab - Viscosity of Liquids - Lab Workbook Syrup 5cm .80 sec .84 sec .86 sec 0.83 sec EXPERIMENT 2: VISCOSITY AT HIGH TEMPERATURE Data Sheet Table 2: Time for marble to drop through highest viscosity substance Highest Viscosity Substance Height of solution (cm) Time (seconds) Trial 1 Time (seconds) Trial 2 Time (seconds) Trial 3 Average Time (seconds) ___ Honey______ 5cm 1.23 sec 1.30 sec 1.28 sec 1.27 sec POST-LAB QUESTIONS 1. List the substances from table 1 in terms of increasing viscosity at room temperature. -Honey -Syrup -Vegetable oil -Water 2. List the substances from table 1 in terms of increasing intermolecular forces at room temperature. -Honey -Syrup -Vegetable oil -Water 3. Investigate what molecules make up each substance. It is fine to use Wikipedia. You should also look on the ingredients list for each substance below. Water - Also known as H2O, is made up of 1 oxygen (O) atom and 2 hydrogen atoms. Honey – The molecule for honey is C6H12O6. Honey consists of a mixture of sugars(glucose and sucrose), mineral substances, salts of organic acids, citric acid, and vitamins.
Unit 1 Lab - Viscosity of Liquids - Lab Workbook Syrup – Syrup is made up of carbohydrates (glucose and fructose, or sucrose), citric acid, natural and artificial flavors, sodium benzoate, propylene glycol, and potassium sorbate. Vegetable Oil – Vegetable oil is composed of various types of molecules, primarily triglycerides. Triglycerides are made up of three fatty acid molecules attached to a glycerol molecule. 4. What intermolecular forces do you expect each substance above to have based on the molecules in each one ( list each one). Water - Hydrogen bonding Honey – Hydrogen bonding and Van der Waals force Syrup – Hydrogen bonding and Van der Waals force Vegetable Oil – Van der Waals forces (specifically London dispersion forces) 5. Based on the intermolecular forces (and molar masses!) do the results you obtained make sense? Why or why not? (it is okay if the results don’t make sense but explain why that is!) Viscosity measures the fluid's resistance to flow, so stronger forces contribute to higher viscosity, while weaker forces lead to lower viscosity. The results confirmed this, as liquids with strong forces, like honey, made the marble move slowly, indicating high viscosity. In contrast, liquids with weak forces, like water, allowed the marble to move quickly, showing low viscosity. So, the strength of internal forces, like hydrogen bonding and van der Waals forces, directly influenced the molecules within the liquid.
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Unit 1 Lab - Viscosity of Liquids - Lab Workbook 6. Remember to include your four photos from your lab when you upload this workbook into the assignment folder.

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