Modeling Chemical Bonding p 184
1.
name_____________________________
Sketch a picture and an electron dot formula of the two hydrogen atoms coming together and sharing their
electrons to form a hydrogen molecule.
2. What is the bond formed between two atoms that share a pair of electrons? ___________________________
3. How many electrons does carbon have? _________________________
How many electrons does carbon have in its first shell? ______________________
How many electrons does carbon have in its second shell? _______________________
What is the total capacity of electrons to fill carbon’s second shell _____________________
How many more electrons are needed to completely fill carbon’s second shell?______________
4. Draw a sketch and a electron dot formula for the formation of methane CH4 from four hydrogen atoms and one
carbon atom.
A) How many electrons does it take to complete carbon’s outer shell?______________
B) How many electrons does it take to complete hydrogen’s outer shell?_____________
5. Represent methane using a structural formula.
Modeling Alkanes p. 186
name ______________________________
1. Draw a structural formula for methane (CH4).
Construct a model of methane using the molecular modeling kit.
a) Describe what the structural formula and the molecular model have in common.
b) What is different between the structural formula and the molecular model.
c) What is the angle formed by the bonds in the tetrahedron? ___________________
d) Why would the negatively charged electrons form this angle rather than a 90o angle?
2. Try to draw methane as a three dimensional object.
3. Assemble molecular models of two-carbon and three-carbon alkane molecules.
a) How many hydrogen atoms are present in the two-acrbon alkane? __________________
b) How many hydrogen atoms are present in the three-carbon alkane?_________________
c)
Draw an electron dot and structural formula for the two-carbon alkane.
d) Draw an electron dot and structural formula for the three-carbon alkane.
e) What is the molecular formula for
1) methane , the first alkane ____________________________
2) the second alkane
____________________________
3) the third alkane
____________________________
4. Try to predict the molecular formula for the fourth alkane
5. The general molecular formula for all alkanes is
____________________________
CnH2n+2
a) Write the molecular formula for pentane (five carbons).
__________________________
b) Write the molecular formula for hexane (six carbons)
__________________________
6. Write the long formula for
a) Ethane (2-carbon)
c) Propane (3-carbon)
d) Butane (4 carbon)
_________________________
_________________________
__________________________
7. Name the alkanes with these long formulas.
a) CH3CH2CH2CH2CH2CH2CH3
b) CH3CH2CH2CH2CH2CH2 CH2CH3
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