CHEM 1204 Test2

Question 1

stereoisomers

Answer 1

molecules with the same structural formula but different 3 dimensional shapes

Question 2

chiral

Answer 2

an object is chiral if it cannot be superimposed on its mirror image

Question 3

an example of chiral

Answer 3

hands in a mirror

Question 4

achiral

Answer 4

an object can be superimposed on its mirror image

Question 5

enantimers

Answer 5

a chiral object and its mirror image make up a pair of enantiomers; also say that a chiral object and its mirror image are enantiomers of one another

Question 6

chiral carbon atom

Answer 6

a carbon atom is chiral if it has 4 different things (atoms or groups) attached to it

Question 7

a sugar that is a polyhydroxyl aldehyde (an aldehyde with an -OH group attached to every carbon with carbonyl group)

Answer 7

aldose

Question 8

a sugar that is a polyhydroxyl ketone (a ketone with the carbonyl group on the 2nd carbon and the -OH group attached to all other carbons)

Answer 8

ketose

Question 9

a way f representing a chiral molecule on a flat surface

Answer 9

Fischer projection

Question 10

How to draw Fischer Projection

Answer 10

the chiral carbon atoms are not explicitly show; a chiral carbon atom occurs/exists at every intersection of 2 lines; carbon atoms that are not explicitly show are drawn vertically

Question 11

Aldose Fischer

Answer 11

has a carbonyl group on the top carbon

Question 12

Ketose Fischer

Answer 12

has a carbonyl group on the 2nd carbon from the top

Question 13

carbohydrate

Answer 13

a polyhydroxy(-OH) aldehyde or ketone or substance that yields polyhydroxy aldehydes or ketones upon hydrolysis

Question 14

-OH represents

Answer 14

a hydroxy group and an alcohol group

Question 15

monosaccharide

Answer 15

a single sugar molecule

Question 16

disaccharide

Answer 16

a molecule made of 2 monosaccharides

Question 17

polysaccharide

Answer 17

a molecule made up of many monosaccharides; some polysaccharides are made up of thousands of monosaccharides

Question 18

D form of glucose

Answer 18

the -OH group on the bottom chiral carbon points right

Question 19

L form of glucose

Answer 19

the -OH group on the bottom chiral carbon points left

Question 20

what is the geometry of a chiral carbon

Answer 20

tetrahedral

Question 21

dextrose

Answer 21

most important sugar that is the right glucose

Question 22

how many chiral carbons does glucose have

Answer 22

4

Question 23

# of chiral carbons : 1
# of Fischer projections: 
# of pairs of enantiomers

Answer 23

# of Fischer projections: 2
# of pairs enantiomers: 1

Question 24

# of chiral carbons : 2
# of Fischer projections: 
# of pairs of enantiomers

Answer 24

# of Fischer projections: 4
# of pairs enantiomers: 2

Question 25

# of chiral carbons : 3
# of Fischer projections: 
# of pairs of enantiomers

Answer 25

# of Fischer projections: 8
# of pairs enantiomers: 4

Question 26

# of chiral carbons : 4
# of Fischer projections: 
# of pairs of enantiomers

Answer 26

# of Fischer projections: 16
# of pairs enantiomers: 8