Properties of Water Quiz

cohesion cause

weak hydrogen bonds that easily break and reform

cohesion defintion

attraction btwn water molecules, water molecules stick to other water molecules

effect of cohesion

surface tension, insects can walk on water

adhesion cause

polarity of water (positive and negative molecule charge)

adhesion definition

Water molecules stick to other molecules that have a positive or negative charge

adhesion effect

helps water cling to plant cell walls for transport

universal solvent

water can dissolve wide variety of substances

universal solvent effect

allows cells and blood (made of water) them to have dissolved salts and gases

aqueous solution

water is the solvent

hydrophilic

water loving, can dissolve in water

hydrophobic

water fearing, cannot dissolve in water

T/F: Water is non-polar.

false, water is a polar molecule

why is water polar?

oxygen has slight negative charge and hydrogen has slight positive charge

hydrogen bonds

form weak bonds btwn positively charged hydrogen from one molecule and negatively charged oxygen from another water molecule

high specific heat

water can absorb a lot of heat without changing much in temperature, takes more energy to change temp of water

effect of high specific heat

important for climate moderation and homeostasis in body

capillary action cause

cohesion and adhesion

capillary action definition

ability of water to flow in narrow spaces without external forces

capillary action effect

Water climbs from roots to top of plant through small tubes. The water sticks to itself (cohesion) and to the side of the tube (adhesion)

high surface tension cause

cohesion

surface tension definition

most of liquid has the attraction of the particles in the surface layer, minimizes surface area

why is water transparent to visible spectrum?

molecules of water cannot absorb visible light, can reflect light

pH level

water has neutral pH = 7

effect of neutral pH

water makes up most cells, would destroy organelles if too acidic or too basic

density/ability to crystallize

water expands as it freezes, solid water has low density

effect of water’s low density

ice can float and insulate aquatic habitats

thermal conductivity effect

evaporative cooling

evaporative cooling

water evaporation removes heat from a surface, helps regulate temperature in organisms (aka sweat)

thermal conductivity cause

high specific heat