BSC1010 CH. 3 QUIZ EXAM QUESTIONS AND ANSWERS
WITH COMPLETE 100% VERIFIED SOLUTIONS
How can you distinguish acid from base?
An acid is a substance that increases the hydrogen ion (H+) concentration of a solution. (pH 6 or below)
While a base is a substance that reduces the hydrogen ion (H+) concentration of a solution. (pH 8 or
above)
How can you relate acid and base to pH scale?
An acidic solution (such as lemon juice) would have a lower pH scale number since the H+ concentration
is greater. An alkaline solution (such as bleach) has a higher pH scale number since the OH-
concentration is greater. Acid- High concentration of H+ makes it acid, and anything which dissociates in
water to increase H+ concentration
Base- High concentration of OH- make it basic, and anything which releases OH- or combines with H+
when dissolved in water
What is the difference between adhesion and cohesion?
Adhesion is the clinging of one substance to another and cohesion occurs when molecules are linked by
multiple hydrogen bonds which in turn holds the substance together.
Why does water have high specific heat?
Water has a high specific heat because of its hydrogen bonding. Heat must be absorbed in order to break
hydrogen bonds; by the same token, heat is released when hydrogen bonds form. A calorie of heat
, causes a relatively small change in the temperature of water because much of the heat is used to disrupt
hydrogen bonds before the water molecules can begin moving faster.
Why water can moderate temperature?
Water can moderate temperature since a large body of water can absorb and store a huge amount of
heat from the sun in the daytime and during summer while warming up a few degrees. At night and
during the winter, the gradually cooling water can warm the air. This capability of water serves to
moderate air temperatures in coastal areas. The high specific heat of water also tends to stabilize ocean
temperatures. Also because of it's high heat the water that covers most of the Earth keeps temperature
fluctuation on land and in water within limits that permit life.
At what temperature is water at its densest?
Water reaches its greatest density at 4°C and liquid state is always more dense than ice state.
Why does ice float in liquid water?
Ice floats in liquid water because its lower density as a solid than as a liquid. This is an important factor
in the suitability of the environment for life. Also because hydrogen bonds keep the water molecules
farther apart in ice, making ice less dense.
Why does water display the unique properties like cohesion, heat capacity, and making ice float?
Water has the unique property of cohesion because its molecules stay close to each other as a result of
hydrogen bonding. Although continuously changing, at any given moment many of the molecules are
linked by multiple hydrogen bonds. These linkages make water more structured than most other liquids.
Another unique property of water is its heat capacity which is due again to its hydrogen bonds. Heat
must be absorbed in order to break hydrogen bonds; by the same token, heat is released when hydrogen
bonds form. Water resists changing its temperature; when it does change its temperature, it absorbs or
WITH COMPLETE 100% VERIFIED SOLUTIONS
How can you distinguish acid from base?
An acid is a substance that increases the hydrogen ion (H+) concentration of a solution. (pH 6 or below)
While a base is a substance that reduces the hydrogen ion (H+) concentration of a solution. (pH 8 or
above)
How can you relate acid and base to pH scale?
An acidic solution (such as lemon juice) would have a lower pH scale number since the H+ concentration
is greater. An alkaline solution (such as bleach) has a higher pH scale number since the OH-
concentration is greater. Acid- High concentration of H+ makes it acid, and anything which dissociates in
water to increase H+ concentration
Base- High concentration of OH- make it basic, and anything which releases OH- or combines with H+
when dissolved in water
What is the difference between adhesion and cohesion?
Adhesion is the clinging of one substance to another and cohesion occurs when molecules are linked by
multiple hydrogen bonds which in turn holds the substance together.
Why does water have high specific heat?
Water has a high specific heat because of its hydrogen bonding. Heat must be absorbed in order to break
hydrogen bonds; by the same token, heat is released when hydrogen bonds form. A calorie of heat
, causes a relatively small change in the temperature of water because much of the heat is used to disrupt
hydrogen bonds before the water molecules can begin moving faster.
Why water can moderate temperature?
Water can moderate temperature since a large body of water can absorb and store a huge amount of
heat from the sun in the daytime and during summer while warming up a few degrees. At night and
during the winter, the gradually cooling water can warm the air. This capability of water serves to
moderate air temperatures in coastal areas. The high specific heat of water also tends to stabilize ocean
temperatures. Also because of it's high heat the water that covers most of the Earth keeps temperature
fluctuation on land and in water within limits that permit life.
At what temperature is water at its densest?
Water reaches its greatest density at 4°C and liquid state is always more dense than ice state.
Why does ice float in liquid water?
Ice floats in liquid water because its lower density as a solid than as a liquid. This is an important factor
in the suitability of the environment for life. Also because hydrogen bonds keep the water molecules
farther apart in ice, making ice less dense.
Why does water display the unique properties like cohesion, heat capacity, and making ice float?
Water has the unique property of cohesion because its molecules stay close to each other as a result of
hydrogen bonding. Although continuously changing, at any given moment many of the molecules are
linked by multiple hydrogen bonds. These linkages make water more structured than most other liquids.
Another unique property of water is its heat capacity which is due again to its hydrogen bonds. Heat
must be absorbed in order to break hydrogen bonds; by the same token, heat is released when hydrogen
bonds form. Water resists changing its temperature; when it does change its temperature, it absorbs or
