Biology 152 UTM exam review UPDATED
ACTUAL Exam Questions and CORRECT
Answers
What is electronegativity? - CORRECT ANSWER - It is an atoms attraction for the
electrons in a covalent bond
What is a nonpolar covalent bond? - CORRECT ANSWER - equal sharing of electrons
What is a polar covalent bond? - CORRECT ANSWER - unequal sharing of electrons
What is a hydrogen bond? - CORRECT ANSWER - the attraction between a hydrogen
atom with a partial positive charge and another atom with a partial negative charge
What are hot spots? - CORRECT ANSWER - Asymmetrical distribution on electrons in a
molecule results in hot spots of positive or negative charge (van der waals interaction)
What are chemical reactions? - CORRECT ANSWER - the making and breaking of
chemical bonds
What is the charged regions in what molecule cased by? - CORRECT ANSWER - The
charged regions of a water molecule are fused by the polar covalent bonds that hold the molecule
together.
How are hydrogen bonds formed? - CORRECT ANSWER - Regions of neighbouring
water molecules with opposite partial charges are attracted to each other, forming hydrogen
bonds
How much water molecule can bind to each other? - CORRECT ANSWER - 4. Each
water molecule can hydrogen bond to several others; these associations are constantly changing.
, How many negative regions does oxygen have in water molecules? - CORRECT
ANSWER - Because of its electron arrangement, oxygen has two regions with partial
negative charge.
What are the 4 emergent properties of water? - CORRECT ANSWER - 1. Cohesive
behavior
2. Ability to moderate temperature
3. Expansion upon freezing
4. Versatility as a solvent
What is the difference between cohesion and adhesion - CORRECT ANSWER -
Cohesion: Water is attracted to water, and Adhesion: Water is attracted to other substances.
What is surface tension? - CORRECT ANSWER - A measure of how difficult it is to
stretch or break the surface of a liquid
What's moderation of temperature? - CORRECT ANSWER - Water absorbs heat from
warmer air and releases stored heat to cooler air. Water absorbs or releases a large amount of
heat with little change in its own temperature.
What is water specific heat? - CORRECT ANSWER - It is the amount of heat that must be
absorbed or lost for 1 g of a substance to change temperature by 1 degree. 1cal/g/0c. Due to heat
absorbed when hydrogen bonds break. Heat released when hydrogen bonds form
Why does ice float? - CORRECT ANSWER - Because hydrogen bonds in ice are more
"ordered," making ice less dense
What is hydrophilic and hydrophobic? - CORRECT ANSWER - Hydrophilic is water
loving and hydrophobic is water hating
ACTUAL Exam Questions and CORRECT
Answers
What is electronegativity? - CORRECT ANSWER - It is an atoms attraction for the
electrons in a covalent bond
What is a nonpolar covalent bond? - CORRECT ANSWER - equal sharing of electrons
What is a polar covalent bond? - CORRECT ANSWER - unequal sharing of electrons
What is a hydrogen bond? - CORRECT ANSWER - the attraction between a hydrogen
atom with a partial positive charge and another atom with a partial negative charge
What are hot spots? - CORRECT ANSWER - Asymmetrical distribution on electrons in a
molecule results in hot spots of positive or negative charge (van der waals interaction)
What are chemical reactions? - CORRECT ANSWER - the making and breaking of
chemical bonds
What is the charged regions in what molecule cased by? - CORRECT ANSWER - The
charged regions of a water molecule are fused by the polar covalent bonds that hold the molecule
together.
How are hydrogen bonds formed? - CORRECT ANSWER - Regions of neighbouring
water molecules with opposite partial charges are attracted to each other, forming hydrogen
bonds
How much water molecule can bind to each other? - CORRECT ANSWER - 4. Each
water molecule can hydrogen bond to several others; these associations are constantly changing.
, How many negative regions does oxygen have in water molecules? - CORRECT
ANSWER - Because of its electron arrangement, oxygen has two regions with partial
negative charge.
What are the 4 emergent properties of water? - CORRECT ANSWER - 1. Cohesive
behavior
2. Ability to moderate temperature
3. Expansion upon freezing
4. Versatility as a solvent
What is the difference between cohesion and adhesion - CORRECT ANSWER -
Cohesion: Water is attracted to water, and Adhesion: Water is attracted to other substances.
What is surface tension? - CORRECT ANSWER - A measure of how difficult it is to
stretch or break the surface of a liquid
What's moderation of temperature? - CORRECT ANSWER - Water absorbs heat from
warmer air and releases stored heat to cooler air. Water absorbs or releases a large amount of
heat with little change in its own temperature.
What is water specific heat? - CORRECT ANSWER - It is the amount of heat that must be
absorbed or lost for 1 g of a substance to change temperature by 1 degree. 1cal/g/0c. Due to heat
absorbed when hydrogen bonds break. Heat released when hydrogen bonds form
Why does ice float? - CORRECT ANSWER - Because hydrogen bonds in ice are more
"ordered," making ice less dense
What is hydrophilic and hydrophobic? - CORRECT ANSWER - Hydrophilic is water
loving and hydrophobic is water hating
