Question

question 7 (1 point) which of the following properties of water helps move water to the top of trees? high specific heat of vaporization, adhesion, high solubility, high surface tension. question 8 (1 point) which of the following is not a type of intermolecular force of attraction? covalent bond, london dispersion force, dipole-dipole interaction, hydrophobic interaction. question 9 (1 point) buffers contains: a strong acid only, a week base only, a strong acid and strong base, a weak acid and weak base.

Explanation:

Question 7

To determine which property of water helps move water to the top of trees, we analyze each option:

• High specific heat of vaporization: Related to energy needed for vaporization, not water movement in trees.
• Adhesion: Attraction between water molecules and other substances (like xylem walls). This, along with cohesion, helps in capillary action to pull water up trees.
• High solubility: Related to dissolving substances, not water movement in trees.
• High surface tension: Related to the surface of water, not vertical movement in trees.

So, adhesion is the property that helps move water to the top of trees.

To find which is not an intermolecular force:

• Covalent bond: A bond within a molecule (intramolecular), not between molecules.
• London dispersion force: A type of intermolecular force.
• Dipole - dipole interaction: A type of intermolecular force.
• Hydrophobic interaction: A type of intermolecular force (between non - polar molecules and water - related interactions).

So, covalent bond is not an intermolecular force.

A buffer solution resists pH change. It is made of a weak acid and its conjugate base (or a weak base and its conjugate acid).

• A strong acid only: Cannot buffer as it will dissociate completely and not resist pH change.
• A weak base only: Cannot buffer effectively alone.
• A strong acid and strong base: Will neutralize each other and not form a buffer.
• A weak acid and weak base: (Note: Typically a weak acid and its conjugate base or weak base and its conjugate acid, but among the options, this is the correct one as buffers need a weak acid - base pair to resist pH change).

So, buffers contain a weak acid and weak base (correct option as per the given choices, considering the intended concept of buffer components).

Answer:

B. Adhesion

Question 8