Question

1. honey is composed mostly of the sugars glucose and fructose. what property of water explains why honey dissolves easily in water? (a.5.i)

a. water exhibits strong cohesion and honey doesn’t.
b. water has a high specific heat and so does honey.
c. water is a polar molecule and so is honey.
d. water is easily ionized and honey isn’t.

1. when a water molecule sticks to another polar molecule it is called: (a.5.i)

a. adhesion
b. cohesion
c. covalent bonding
d. ionic bonding

1. water is a polar molecule, which means it has a slightly positive and a slightly negative end or pole. which end of the water molecule is positive and which end is negative? (a.5.i)

a. the top end is positive and the bottom end is negative.
b. the oxygen end is positive and the hydrogen end is negative.
c. the north pole is positive and the south pole is negative.
d. the hydrogen end is positive and the oxygen end is negative.

1. which of the following statements about ice is false? (a.5.i)

a. ice is denser than liquid water
b. if ice sank, the oceans would eventually freeze solid
c. ice is less dense than liquid water
d. water naturally exists in all three physical states on earth

1. a substance with a ph value below 7 is a(an): (a.5.f)

a. acid b. alkaline c. base d. neutral

1. which solution has the greatest concentration of hydroxide ions (oh⁻)? (a.5.f)

a. baking soda (ph 9.0)
b. ammonia (ph 11.0)
c. gastric/stomach juice (ph 2.0)
d. rain water (ph 5.5)

1. a buffer: (a.5.f)

a. is a base that is used to offset overly acidic conditions in the body
b. is an acid that is used to offset overly basic conditions in the body
c. donates carbon ions when conditions become too basic and carbon ions when conditions become too acidic
d. donates h⁺ ions when conditions become too basic and removes h⁺ ions when conditions become too acidic

Explanation:

• Question 23: Water is a polar molecule. Polar - polar substances dissolve well together. Glucose and fructose in honey are polar, so water's polarity allows honey to dissolve easily.
• Question 24: Adhesion is when a water molecule sticks to another polar molecule. Cohesion is water - water molecule sticking, covalent and ionic bonding are types of chemical bonds not related to this sticking property here.
• Question 25: In a water molecule ($H_2O$), oxygen is more electronegative than hydrogen. So the oxygen end is slightly negative and the hydrogen end is slightly positive.
• Question 26: Ice is less dense than liquid water. If ice sank, oceans would eventually freeze solid. Water exists in all three states on Earth.
• Question 27: A substance with a pH below 7 is an acid. A pH above 7 is a base (alkaline), and pH = 7 is neutral.
• Question 28: The higher the pH, the greater the concentration of hydroxide ions ($OH^-$). Ammonia with a pH of 11.0 has the highest pH among the given options.
• Question 29: A buffer donates $H^+$ ions when conditions become too basic and removes $H^+$ ions when conditions become too acidic to maintain a stable pH.

Answer:

1. C. Water is a polar molecule and so is honey.
2. A. Adhesion
3. D. The Hydrogen end is positive and the Oxygen end is negative.
4. A. Ice is denser than liquid water
5. A. Acid
6. B. ammonia (pH 11.0)
7. D. donates H+ ions when conditions become too basic and removes H+ ions when conditions become too acidic