Water Practice- SL

In the context of the origin of life, why is the ocean considered a more likely location than a pond?

• Ponds lack the necessary chemical elements for life

• Oceans provide a more stable and diverse environment

• Ponds have higher radiation levels that inhibit life

• Oceans have lower temperatures, favoring biochemical reactions

Tags

NGSS.HS-ESS2-7

Why is sweat a good coolant for the body?

• Sweat contains minerals such as sodium chloride.

• Sweat is non-polar.

• The arterioles that transfer water to sweat move closer to the skin surface when it’s hot.

• Breaking H bonds between water molecules in sweat require energy from body heat.

Why does ice float on water?

• Ice has a higher density than water.

• The hexagonal lattice structure of ice results in a lower density compared to liquid water

• Ice molecules are more tightly packed than in liquid water

• Ice exhibits stronger hydrogen bonding, making it buoyant.

Tags

NGSS.MS-PS1-1

Why are oils and fats considered good insulators?

• They conduct heat faster than water

• They lack the ability to transfer heat

• They conduct heat at the same rate as water

• They conduct heat about 25% the rate of water

How do living organisms with a density close to that of water benefit from this characteristic?

• It allows them to sink to the bottom of aquatic habitats

• It minimizes the energy required for maintaining buoyancy

• It helps them resist air pressure changes at varying altitudes

• It promotes efficient nutrient absorption in terrestrial environments

What is plasmolysis?

• The process of cell division

• The shrinking of the cell membrane in a hypertonic solution

• The expansion of the cell membrane in a hypotonic solution

• The bursting of a cell in an isotonic solution

Why does plasmolysis occur?

• Due to excess water entering the cell

• Due to water leaving the cell in a hypertonic environment

• Due to the cell absorbing too much salt

• Due to the cell being in an isotonic environment

What charge does oxygen typically have in a water molecule?

• Positive

• Negative

• Neutral

• Variable

What happens to a cell in a hypotonic solution?

• The cell remains unchanged

• The cell swells and may burst due to water intake

• The cell shrinks due to water loss

• The cell undergoes plasmolysis

What is the primary reason for the high surface tension of water?

• Its ability to dissolve salts

• Its low density

• Hydrogen bonding between water molecules

• Its high viscosity