University:
High School
Course:
High School Chemistry
Academic year:

2022
Views:

309

Pages:

1
Author:

StellarSymphony

Name:___________________ Per:___ Comparing “Inter” Molecular & “Intra” Molecular Forces 1. Label the arrows on the picture to the right as hydrogen bonds or covalent bonds (dotted vs. solid lines) 2. When water changes phase (ex: ice breaking? Explain.  liquid water  gas) which bonds are 3. Classify the following as intermolecular or intramolecular forces: a. Bonds between elements (within a molecule) = b. Bonds between molecules= c. Ionic bond= d. covalent bond= e. Metallic Bond= f. hydrogen bond= 4. Which force is stronger (inter- or intra-molecular)? How do you know? Activity: How Many Drops of Water Fit on a Penny? (see directions at lab station) Data: 1. Take a Guess: How many drops of water can fit on one side of a penny? _____ Water Drops on a Penny Trial 1 2 3 Average # of drops # of drops of H2O 2. Take a Guess: How many drops of alcohol can fit on one side of a penny? ___ Alcohol (C3H7OH) Drops on a Penny Trial 1 2 3 Average # of drops # of drops of C3H7OH Analysis Questions: 1. Compare the appearance of the droplet formed by the water & rubbing alcohol on the penny. 2. What are some reasons other members of the class may have a different average than you? 3. Compared to regular water, how many drops of water would you expect to fit on a penny if you were using soapy water? Give a reason for your response that is related to intermolecular forces. 4. Explain your results in terms of cohesion and surface tension. Did the penny hold as many drops as you first thought?