You are comparing the surface tension on two bodies of water: a fresh-water pond and a salt-water lagoon. Which one, if measured, would have a higher surface tension?

Question

(1 point)
Responses

the fresh-water pond because it has a lower density

the fresh-water pond because it has a lower density

the salt-water pond because it has a higher density

the salt-water pond because it has a higher density

the fresh-water pond because it has a lower pH

the fresh-water pond because it has a lower pH

the salt-water pond because it has a higher pH

Answer 1

The fresh-water pond would have a higher surface tension. This is primarily because fresh water has fewer dissolved substances compared to salt water, which contains salts and other ions that disrupt the cohesive forces between water molecules. Higher concentration of ions in salt water reduces its surface tension.

So, the correct response is:

the fresh-water pond because it has a lower density.

(Note: Density itself isn't the main factor affecting surface tension, but the explanation about freshness vs. salinity is to highlight why fresh water is expected to have higher surface tension.)

Answer 2

What unique property of water assists in the fight against gravity when water moves from root to tip?

(1 point)
Responses

photosynthesis

photosynthesis

cohesion

cohesion

solubility

solubility

adhesion

Answer 3

The unique property of water that assists in the fight against gravity when water moves from the roots to the tip of a plant is cohesion.

Cohesion refers to the attraction between water molecules, which helps to maintain a continuous column of water within the plant's xylem as it is pulled upwards through a process called transpiration.

So, the correct response is: cohesion.

Answer 4

Alex is preparing a presentation on mangroves that live in the intertidal zone. What slide would you MOST LIKELY find in his presentation?

(1 point)
Responses

Mountain Ecosystem

Mountain Ecosystem

Aquatic Ecosystem

Aquatic Ecosystem

Tundra Ecosystem

Tundra Ecosystem

Grassland Ecosystem

Answer 5

In a presentation about mangroves that live in the intertidal zone, you would MOST LIKELY find a slide labeled Aquatic Ecosystem.

Mangroves are coastal vegetation found in saltwater environments, specifically in the intertidal zones of tropical and subtropical regions, making them part of the aquatic ecosystem.

So, the correct response is: Aquatic Ecosystem.

Answer 6

Milo is boiling water, but it is taking a long time for the water to reach its boiling point. Which of the following BEST describes why?

(1 point)
Responses

Water takes little energy to heat.

Water takes little energy to heat.

Water has low thermal conductivity.

Water has low thermal conductivity.

Water has a high heat capacity.

Water has a high heat capacity.

Water is the universal solvent.

Answer 7

The reason why it is taking a long time for the water to reach its boiling point is best described by the fact that water has a high heat capacity.

Water's high heat capacity means it can absorb a lot of heat before its temperature rises significantly, which is why it takes longer to heat up to the boiling point compared to substances with lower heat capacities.

So, the correct response is: Water has a high heat capacity.

Answer 8

A large lagoon is far below its usual water level. What tool would researchers MOST likely use to gather data on the amount of fresh water entering the lagoon from the incoming stream?

(1 point)
Responses

a swing-arm hydrometer because it will determine the salinity

a swing-arm hydrometer because it will determine the salinity

a stream gauging system because it will detect flow volume

a stream gauging system because it will detect flow volume

a conductivity meter because it will determine the exact quantity of salt

a conductivity meter because it will determine the exact quantity of salt

a water quality strip because it will detect contamination

a water quality strip because it will detect contamination

Answer 9

The tool that researchers would MOST likely use to gather data on the amount of fresh water entering the lagoon from the incoming stream is a stream gauging system because it will detect flow volume.

This system measures the volume of water flowing in the stream, which will help determine how much fresh water is entering the lagoon.

So, the correct response is: a stream gauging system because it will detect flow volume.