Strengths of covalent bonds

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Presentation transcript:

Strengths of covalent bonds Covalent bonds can be single, double or triple. In this lab you will compare and contrast the stretching of rubber bands and the dissociation energy (energy used to break) of covalent bonds.

Materials 4 batteries 3 rubber bands Metric ruler Plastic bag Paper clip Graph paper Ring stand or Newton meter

Procedure Hang 1 rubber band from ring on stand or from hook of Newton meter. Measure length of rubber band in cm before stretching. Fasten plastic bag to rubber band with a paperclip Add one battery to plastic bag measure length of rubber band. Record data. Repeat measurements by adding 2,3 4 batteries. Use scales to weigh one battery (multiply to get mass of 2,3,4 batteries) Repeat all steps using 2 and 3 rubber bands.

Data table Number of batteries Mass (g) Length of rubber band (cm) 1 2 3 4

Graph Make a graph of your data showing length on the y axid versus mass on the x-axis. Connect the points using a best fit line. 1. assuming the rubber bands are models for covalent bonds what can you conclude about the relative strengths of single, double , triple bonds? 2. how does the behavior of the rubber bands differ from that of covalent bonds?