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Biology 120 quiz 2
GVSU - Aledavood
Terms in this set (69)
True or False: hydrogen bond is the result of electron transfer between Hydrogen and Oxygen atoms?
True or False: hydrogen bonds can form within two smaller molecules that exist within a larger molecule?
When is a covalent bond polar?
When shared electrons spend more time around one of the nuclei
True or False: the reason for generation of the hydrogen bonds between two water molecules is that both hydrogen and oxygen atoms are involved in polar bonds within other molecules?
True or False: a polar covalent bond is a bond that forms between two oppositely charged ions?
When an electron of a neutral atom is transferred to another neutral atom, this type of chemical bond is called?
True or False: when an electron of an atom is donated to antoehr atom, a polar covalent bond is created?
What happens when an electron of a neutral atom is transferred to another neutral atom?
An anion, cation, and ionic bond are generated
True or False: a hydrogen bond forms because hydrogen of a molecule is involved in a covalent bond with a more electronegative atom?
What two chemical bonds contribute in generation of the specific structures of water?
Polar covalent bond, and Hydrogen bond
Why is each O-H bond within a water molecule polar?
Because O is more electronegative than H
In a body of water, the interactions between water molecules (hydrogen bonds) are due to?
Oppositely charged spots within ALL water molecules, and the presence of polar bonds within each water molecule
True or False: if hypothetically the electronegativity value for O is increased, a water molecule would become MORE polar?
True or False: hydrogen bonds are polar covalent bonds between hydrogen and oxygen?
True or False: one of the differences between a covalent bond and a hydrogen bond is that the covalent bond is harder to break?
Which of the chemical bonds is the strongest?
True or False: the covalent bond between oxygen and most other atoms is polar?
True or False: the O=O bond is non-polar?
True or False: the bond between 2 N atoms is non-polar?
True or False: the bond between O and N atoms is non-polar?
True or False: oxygen can make up to 2 types of bonds with hydrogen; covalent and hydrogen bonds?
True or False: the bond between 2 different atoms is ALWAYS polar?
If the number of protons of an atom changes, what happens?
An atom of another element is generated
The difference between the electronegativity values of 2 atoms in a polar covalent bond is ____ the difference between the 2 atoms of a nonpolar bond?
What chemical bond will you find a larger difference between the electronegativity values of the atoms?
True or False: an atomy like oxygen can make 2 different types of chemical bonds (ex. covalent and ionic, covalent and hydrogen) with 2 different atoms in a single molecule?
True or False: if oxygen is involved in a nonpolar covalent bond, it still can make a hydrogen bond with partially positive hydrogen of another molecule?
True or False: hydrogen bonding occurs when a hydrogen atom of a molecule like CH4 or H2 is attracted to an electronegative atom (N or O) of another molecule?
The hydrogen of which of the molecules below would NOT form hydrogen bonds?
Hydrogen bonds hold water molecules together, and make water more structured than most other liquids, what is this property of water called?
What contributes to the transport of water and dissolved nutrients against gravity in plants?
Cohesion, Adhesion, and the structure of the cell wall of the water-conducting cells in plants
True or False: if the cell wall of the water-conducting cells were made up of a non-polar substance, there would be no adhesion?
Kinetic energy of a substance is the type of energy that is?
Due to the motion of molecules of the substance, can be manifested as heat, and can be transferred to another substance
True or False: heat is a type of energy that is required for hydrogen bonds to form?
True or False: heat of a substance is the average of the kinetic energies of all molecules of the substance?
True or False: heat is the same as temperature?
Does heat of a substance depend on its volume?
Does temperature of a substance depend on the volume?
True or False: temperature is the sum of the kinetic energies of all molecules of the substance?
True or False: waters ability to moderate air temperature is a direct result of the presence of hydrogen bonds between its molecules?
Water has a high specific heat, therefore:
It warms up and cools down slowly
Why are steam burns more severe than burns from boiling water?
Steam has a larger amount of heat energy
Hydrophobic substances such as oils are:
Substances that lack charges on their surface and repel water molecules
Why is water a versatile solvent?
Because of its polarity
Which substance CANNOT dissolve in water?
Non-polar molecules with covalent bonds
When you dissolve table salt in water, which term would most appropriately be applied to the salt?
True or False: some of the hydrophilic substances may not be water soluble?
What do acidic substances increase and decrease?
Increases concentration of H+ and decreases the concentration of OH-
What do basic substances increase and decrease?
Increases the concentration of OH- and decreases the concentration of H+
A solution of pH 6 is _____ times more ____ than a solution of pH 2?
Ten thousand - basic
Most biological fluids have a pH within the range of?
6 to 8
What is a buffer?
Substance that minimizes changes in body pH by absorbing extra H+ or OH-
True or False: surfactant is a substance that reduces surface tension of a liquid. If water was treated with surfactant, water striders would sink?
True or False: if water were LESS polar, heavier insects than water striders would be able to walk on the surface of the pond?
True or False: if water were LESS polar, more salts would go into the solution in blood and body fluids?
The difference between the structures of liquid water and water steam is?
Steam has no or very few hydrogen bonds
True or False: a solution with the OH- concentration of 10^-9 it has a pH of 5?
True or False: if the pH of the solution is 4, then the OH concentration is 10^-10?
True or False: hydrogen bonds need energy to form, and release energy when they break?
True or False: pH is the negative logarithm of concentration of H+ or OH-?
Why can't oils dissolve in water?
Because they have a lot of nonpolar CH bonds in their structures
Why does the element carbon make the great diversity of organic molecules possible?
Because it has 4 unpaired electrons in its valence shell
True or False: none of the major elements of life including O, C, H, N, S, and P have a complete valence shell?
True or False: carbon dioxide contains carbon but is not considered an organic molecule?
In an organic compound what can carbon NOT have?
A double bond with hydrogen
True or False: all of the macromolecules have at least THREE elements in their structures; two of them are ALWAYS C and H?
What are the valence values of C, O, H, and N?
4, 2, 1, 3
Why is carbon the main element of life?
Because carbon has the capacity to make infinite types of molecules
True or False: hydrocarbons can only have carbon to carbon single bonds?
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