WATER BASICS (CORRECT ONE)

Hot water _____. has a higher pH value than cold water holds less dissolved oxygen than cold water is beneficial to living organisms in aquatic ecosystems contains more hydrogen than cold water

holds less dissolved oxygen than cold water

Ice floats in water because it _____. is less dense than water contains more oxygen than water has a higher pH than water has more surface tension than water

is less dense than water

The "hardness" of water describes _____. how quickly it heats and cools its attraction to other substances its level of dissolved minerals how much dissolved oxygen it contains

its level of dissolved minerals

Cohesion describes water's _____. attraction to other substances attraction to itself ability to dissolve most substances rate of cooling and heating

attraction to itself

Water _____. boils at 100°C cools very quickly is made of helium and oxygen is slightly acidic at the oxygen end

boils at 100°C

The oxygen side of a water molecule is _____. neutral slightly negative slightly positive

slightly negative

Surface tension _____. causes water to spread out is the ability of water to dissolve a substance creates a thin, elastic layer of hydrogen atoms is caused by cohesion between water molecules on the surface

is caused by cohesion between water molecules on the surface

Which of the following statements is true? Water is easily polluted because it can dissolve harmful chemicals. When water freezes, it contracts and becomes more dense. Thermal pollution happens when cold water is released into an ecosystem. Adhesion describes a water molecule's attraction to another water molecule.

Water is easily polluted because it can dissolve harmful chemicals.