1. Methane, CH4
a. Make a model of methane using the PHET build-a-molecule simulation. Take a screen shot of your 3D molecule and paste it here:
b. Draw CH4 below using dash and wedges.
c. Does the structure look different when you rotate the model?
d. Are the hydrogen atoms equivalent?
e. What is the H-C-H bond angle?
2. Chloromethane, CH3Cl
a. Make a model of chloromethane using the PHET build-a-molecule simulation. Take a screen shot of your 3D molecule and paste it here:
b. Make a second model of chloromethane using the PHET build-a-molecule simulation attaching the chlorine in a different direction. For example if you attached the chlorine on the top, now attach it to the left, or right or bottom. Take a screen shot of your 3D molecule and paste it here:
c. Are a and b different or the same?
d. Draw CH3Cl below using dash and wedges.
e. Does the structure change when you rotate or tilt the model?
f. Are the hydrogen atoms equivalent?
3. Dichloromethane, CH2Cl2
a. Make a model of dichloromethane using the PHET build-a-molecule simulation. Take a screen shot of your 3D molecule and paste it here:
b. Make a second model of dichloromethane using the PHET build-a-molecule simulation attaching the chlorines in a different direction. Take a screen shot of your 3D molecule and paste it here: