Question

which observation supports the idea that water has stronger cohesion than rubbing alcohol?
alcohol heats up more slowly
water has a lower boiling point.
rubbing alcohol dissolves salt more easily
water forms more drops on a penny before spilling
8
multiple choice 1 point
why is waters ability to dissolve substances important to life on earth?
it prevents sunlight from reaching the ocean floor
it prevents erosion
it helps water evaporate quickly
it allows transport of nutrients and minerals in living organisms
9
multiple choice 1 point
in the experiment comparing waters energy storage to other liquids, what conclusion can be made based on temperature changes?
the smallest temperature change shows the least energy was transferred
water stores more energy because it heats up more slowly than other liquids
all liquids store energy the same way
the liquid that changed temperature the most stored the most energy

Explanation:

• Question 7: Cohesion is the attraction between molecules of the same substance. Water forming more drops on a penny before spilling shows stronger cohesion as the cohesive forces keep the water molecules together better than in rubbing alcohol.
• Question 8: Water's ability to dissolve substances is crucial for life as it allows transport of nutrients and minerals in living organisms (e.g., in the bloodstream of animals and xylem/phloem of plants).
• Question 9: Water has a high specific heat capacity. It heats up more slowly than other liquids, meaning it can store more energy for a given temperature change.

Answer:

• Question 7: Water forms more drops on a penny before spilling.
• Question 8: It allows transport of nutrients and minerals in living organisms.
• Question 9: Water stores more energy because it heats up more slowly than other liquids.