Chapter Seven Review
Nonpolar Covalent Bonds
Electrons are shared equally
Solid foods such as bread do NOT contain water
False
The higher the altitude, the less water you will need to drink to stay hydrated
False
The increased surface tension of water accounts for its lower melting and boiling points as compared to other liquids
False
The three types of contaminants found in water are biological, chemical, and microbial
False
Anhydrous
Free of water
Water performs all of the following functions in the body except ______
providing energy
Free water is water that ____
readily separates out of food
Tea and coffee are not brewed in boiling water because boiling water ______
releases bitter polyphenols
When salt and sugar are added to water, _______
the boiling point is higher and the freezing point is lower
Lemon juice is an example of ______
free water
Water makes a good medium for cooking food because ____
heat is transferred throughout by conduction and convection
The boiling point of water at sea level is _____
100 C
Which of the following is an example of a physical contaminant in water?
Plastics
_____ bonds are formed within a water molecule
Polar Covalent
It is best to consume water _____
Regularly throughout the day
Atmospheric pressure is based on the pressure of the atmosphere on an object at sea level
True
Ice floats because water is more dense in the liquid state
True
Most bottling companies have established water standards for their products to maintain a uniform product flavor
True
Steam that is not under pressure is the same temperature as boiling water
True
The shape of water molecules contributes to the physical characteristics of water
True
Water is a nutrient
True
Polar Covalent Bonds
Unequal sharing of electrons
Bound water
Water that is tied to the structure of large molecules like protein and starches
Hydrogen Bond
Weak attraction between positive and negative ends of two molecules
A meniscus is caused by water's ____
adhesive property
An advantage of cooking in steam is ______
all of the above
The force of the weight determined by the pull of the earths gravity pressing down on a surface is ___
atmospheric pressure
Impurities in water ___
can change the physical and chemical characteristics of water
In a hydrogen bond, the _____
hydrogen of one atom is attracted to the oxygen of another
In which state is water most dense?
liquid
Water activity is _____
the water available to support enzyme activity
Cooled boiled water has a flat taste because _____
there is a lower dissolved oxygen level
