Mastering Biology 2 Water

25 July 2022
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Adhesion
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Water molecules cling to the side of a beaker Water molecules cling to plant cell walls
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Cohesion
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Water molecules are attracted to each other A drop of water spilled on a table forms a drop on the table, rather than spreading out over the surface
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Surface Tension
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A water strider runs across a pond without breaking the surface A sewing needle floats when it is placed gently on top of water in a bucket
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What is the arrow pointing to?
What is the arrow pointing to?
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Hydrogen ion The arrow is indicating a single proton, a hydrogen ion (H+)
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What is the arrow pointing to?
What is the arrow pointing to?
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Hydroxide ion (OH-)
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In a neutral solution the concentration of
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Hydrogen ions is equal to the concentration of hydroxide ions
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How does the pH of the solution on the right compare with that of the solution on the left?
How does the pH of the solution on the right compare with that of the solution on the left?
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The solution on the right is basic relative to the solution on the left The solution on the right has a lower concentration of hydrogen ions relative to hydroxide ions than does the solution on the left
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Water molecules have a polarity, which allows them to be electrically attracted to other water molecules and other polar molecules by weak chemical bonds known as
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Hydrogen bonds The polarity of a water molecule allows the oxygen of one water molecule to bond weakly to the hydrogen of another water molecule
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Many of water's emergent properties, such as its cohesion, its high specific heat, and its high heat of vaporization, result from the fact that water molecules
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Are electrically attracted to each other
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The amount of energy that must be absorbed or lost to raise or lower the temperature of 1 g of liquid water by Ā°C
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Is 1 calorie
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Because organisms are made primarily of water, they resist rapid temperature changes. This useful quality is based on water's
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High specific heat
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Sodas typically contain sugar, flavorings, coloring agents, and carbon dioxide dissolved in water. The best term to describe this mixture would be
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An aqueous solution
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An acid is a substance that
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Increases the hydrogen ion concentration of an aqueous solution
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A pH of 6 is how many times more acidic than a pH of 9?
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1,000
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Select the statement that best describes a buffer
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A buffer accepts hydrogen ions when they are in excess and donates hydrogen ions when they have been depleted
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Most acid precipitation results from the combination of ____ with water in the atmosphere, forming strong acids that fall with rain or snow
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Sulfur oxides and nitrogen oxides
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Each water molecule is joined to _____ other water molecules by ____ bonds
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Four, hydrogen
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The unequal sharing of electrons within a water molecule makes the water molecule
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Polar
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The tendency of an atom to pull electrons toward itself is referred to as its
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Electronegativity
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In this molecule, what type of bond is found between the oxygen and hydrogens?
In this molecule, what type of bond is found between the oxygen and hydrogens?
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Polar covalent
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Why isn't this insect drowning?
Why isn't this insect drowning?
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Surface tension
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What name is given to this molecule?
What name is given to this molecule?
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Hydronium ion
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How did this molecule form?
How did this molecule form?
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A water molecule gained an hydrogen ion from another water molecule
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What name is given to this molecule?
What name is given to this molecule?
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Hydroxide ion
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Which of these is the correct equation for the dissociation of water?
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H2O + H2O <==> H3O+ + OH-
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What is the charge on a hydronium ion?
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+1
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What is the charge on a hydroxide ion?
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-1