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CHEM 1100 EXAM 3 QUESTIONS WITH ANSWERS
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CHEM 1100 EXAM 3 QUESTIONS WITH ANSWERS
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CHEM 1100 EXAM 3 QUESTIONS WITHANSWERS
Electronegativity - ANSWER- measure of an atoms attraction for the electrons it shares
in a covalent bond
Polar Bond - ANSWER- electrons are not evenly shared, spend more time closer to the
more electronegative atom in the bond
When is heat absorbed? - ANSWER- Evaporation
When is heat released? - ANSWER- Freezing
Hydrogen Bonding - ANSWER- strongest type of intermolecular attraction
When does a hydrogen bond occur? - ANSWER- When an atom in a very polar bond to
a small EN atom like F,O,N is attracted to a non bonded pair of electrons
Characteristics of water due to hydrogen bond - ANSWER- abnormally high boiling
point, surface tension, specific heat, heat of fusion, heat of vaporization, liquid is more
dense than solid
why does water have a high specific heat? - ANSWER- energy is required to break
hydrogen bonds
why does water expand when frozen? - ANSWER- H bonds align
why does tap water conduct electricity - ANSWER- contains dissolved ions from
minerals/rocks
Plastic and polymer composition - ANSWER- large molecules made up of long chains of
atoms covalently bonded together
LDPE - ANSWER- 4, bags, films, bubble wrap, toys
HDPE - ANSWER- 2, milk jugs, buckets, crates
Polyethelene Terephitude - ANSWER- 1, soft drink bottles
monosaccarides - ANSWER- glucose fructose
disaccarides - ANSWER- lactose sucrose
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