Chemistry sem 2

5.5.3test (tst): teacher-scored unit testtest
chemistry sem 2
points possible: 50
name: anahi mendezdate: 1/3/2020
in this test, you will apply what you have learned in the unit. answer the questions below. submit the test to your teacher when you are done.
question 1: hydrocarbons (12 points)

a. consider the molecule pentane.

i. how many carbon atoms does this molecule have? (1 point)

ii. what kinds of bonds does it have? (1 point)

iii. draw the structural model for this molecule (using c and h). (2 points)

iv. draw the stick (or skeletal) model for this molecule. (2 points)

v. write the chemical formula for pentane. (1 point)

b. consider the molecule 1-butene.

i. how many carbon atoms does it have? (1 point)

ii. what type(s) of bonds does this molecule have? (2 points)

c. change this molecule to 2-methylhexane by redrawing it with the methyl group added. (2 points)

question 2: functional groups (6 points)

the ingredients of a household cleaner include propanol, ethyl acetate, and butanal. answer the following questions about these chemicals.

a. what type of molecule is butanal? (2 points)

b. which oxygen-containing functional group would you find in ethyl acetate? (2 points)

c. draw the functional group found in propanol. (2 points)

question 3: biological molecules (7 points)

a. what type of biological molecule is a monosaccharide? (2 points)

b. it takes more time for your body to break down polysaccharides than disaccharides. what aspect of the molecular structures of these two types of molecules could explain this? (2 points)

c. what two things would a plant be unable to do if it could not produce polysaccharides from monosaccharides? (3 points)

question 4: biological molecules (5 points)

a. what type of macromolecule is dna? (2 points)

b. why can damage to dna affect a person's ability to produce enzymes? (3 points)

question 5: energy sources (12 points)

a. name three energy sources, besides switchgrass, that produce greenhouse gases in the process of creating electricity. (6 points)

b. ethane (c2h6) can be used as a fuel when it is burned in oxygen. write the balanced combustion reaction for ethane. (4 points)

c. which product of ethane combustion contributes to the greenhouse effect? (2 points)

question 6: world energy use (8 points)

this chart shows global energy usage for the year 2005.

use the chart to answer the following questions. (8 points)

a. what percent of the energy came from fossil fuels? (3 points)

b. which renewable energy source was used the most? (2 points)

c. what percent of energy usage did not produce greenhouse gases? (3 points)

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