Mastering BSC1010: Chapter 3
What is the arrow pointing to?
hydroxide ion
The unequal sharing of electrons within a water molecule makes the water molecule _____.
polar
In this molecule, what type of bond is found between the oxygen and hydrogens?
polar covalent
Specific heat of water The table shown here lists the specific heat of several substances. Based on the information in the table, which of the following statements are true?
- Water has a high specific heat due to the hydrogen bonding between water molecules. - More heat is required to raise the temperature of 1 g of water 1*C than to raise the temperature of 1 g of ethyl alcohol 1*C. - Sulfuric acid is less resistant to temperature change than water. - Benzene is more resistant to temperature change than sulfuric acid.
What is the pH of an aqueous solution with the hydronium ion concentration [H3O+] = 2 x 10^-14 M ?
13.7pH
Carbonated cola is more acidic than coffee or even orange juice because cola contains phosphoric acid.
7.59 × 10^−4
Properties of water Classify each statement as an example of adhesion, cohesion, or surface tension
Adhesion: Water molecules cling to the side of a breaker. Water molecules cling to plant cell walls. Cohesion: Water molecules are attracted to each other. A drop of water spilled on table, rather than spreading out over the surface. Surface Tension: A sewing needle floats when it is placed gently on top of water is a bucket. A water strider runs across a pond without breaking the surface
How does the pH of the solution on the right compare with that of the solution on the left?
The solution on the right is basic relative to the solution on the left.
The relationship between pH and acidity Rank the following from most acidic to least acidic.
[H3O+]=10^-2 pH=3 pH=5 [H3O+]=10^-6 pH=14
The tendency of an atom to pull electrons toward itself is referred to as its _____.
electronegativity
What process exerts the pull on water molecules that is relayed from leaf to root via cohesion?
evaporation
A water molecule can bond to up to _____ other water molecules by ____ bonds.
four ... hydrogen
What is the arrow pointing to?
hydrogen ion
In a neutral solution the concentration of _____.
hydrogen ions is equal to the concentration of hydroxide ions
Why isn't this insect drowning?
surface tension
