Biology 152 UTM exam with | | | | |
precise detailed answers | |
What is electronegativity? - Correct answer ✔It is an atoms attraction for the
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electrons in a covalent bond
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What is a nonpolar covalent bond? - Correct answer ✔equal sharing of
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electrons
What is a polar covalent bond? - Correct answer ✔unequal sharing of electrons
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What is a hydrogen bond? - Correct answer ✔the attraction between a hydrogen
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atom with a partial positive charge and another atom with a partial negative
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charge
What are hot spots? - Correct answer ✔Asymmetrical distribution on electrons
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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.
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How are hydrogen bonds formed? - Correct answer ✔Regions of neighbouring
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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
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water molecule can hydrogen bond to several others; these associations are
| | | | | | | | | | |
constantly changing. |
How many negative regions does oxygen have in water molecules? - Correct
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answer ✔Because of its electron arrangement, oxygen has two regions with
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partial negative charge.
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What are the 4 emergent properties of water? - Correct answer ✔1. Cohesive
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behavior
2. Ability to moderate temperature
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3. Expansion upon freezing
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4. Versatility as a solvent
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What is the difference between cohesion and adhesion - Correct answer
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✔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
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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
| | | | |
What is dynamic equilibrium - Correct answer ✔Water molecules dissociate at
| | | | | | | | | | |
the same time they are being reformed
| | | | | |
What is ocean acidification? - Correct answer ✔refers to a reduction in the pH
| | | | | | | | | | | | | |
of the ocean over an extended period of time, caused primarily by uptake of
| | | | | | | | | | | | | |
carbon dioxide (CO2) from the atmosphere. H+ ions combine with carbonate
| | | | | | | | | | |
ions to produce bicarbonate
| | |
precise detailed 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
| | | | |
What is dynamic equilibrium - Correct answer ✔Water molecules dissociate at
| | | | | | | | | | |
the same time they are being reformed
| | | | | |
What is ocean acidification? - Correct answer ✔refers to a reduction in the pH
| | | | | | | | | | | | | |
of the ocean over an extended period of time, caused primarily by uptake of
| | | | | | | | | | | | | |
carbon dioxide (CO2) from the atmosphere. H+ ions combine with carbonate
| | | | | | | | | | |
ions to produce bicarbonate
| | |
