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chapter 12

chem

QuestionAnswer
The shapes of protein molecules are determined by intermolecular forces true
Intermolecular forces are responsible for The taste of sensations, the shape of protein molecules, function of DNA, the existence of liquids and solids
Which state of matter has a high density and an indefinite shape Liquids
Which statement about surface tension is false Items with densities lower than water will sink due to surface tension
Which state of matter has a high density and a definite volume Both solid and liquids
The measure of the resistance to the flow of a liquid is called Viscosity
Which state of matter has a low density and is easily compressed gases
Liquids can be easily compressed false
Solids usually have much greater densities than gases because molecules of a solid are much further apart false
Viscosity increases with increased intermolecular forces because the molecules attract each other strongly which hinders the flow true
Evaporation is decreased by increasing the intermolecular forces true
The change of a substance from a liquid to a gas form is called vaporization
The rate of evaporation will increase if you pour a liquid out onto a large surface true
Evaporation and condensation are opposite processes true
A situation where two opposite processes are occurring at equal rates and no net change is taking place is called dynamic equilibrium
Increasing the intermolecular forces of a liquid will do which of the following Increase the viscosity, decrease the evaporation rate, increase the surface tension, decrease the vapor pressure
Which statement about boiling point is false The boiling point of a compound is an absolute constant
You feel cooler when you sweat because the process is --- which is --- Evaporation, Endothermic process
Which of the following statements is true Evaporation is an endothermic process, a puddle of water cools down as it evaporates, as a liquid is converted into a gas the liquid absorbs heat
Condensation is --- exothermic heat is released when has condenses to liquid
Explain why steam burns your hand worse than liquid water at the same temp as steam condenses to a liquid on your skin it releases heat causing a severe burn.
The amount of heat required to melt one mole of a solid is called the heat of fusion
Para-dichloro-benzene a material used in moth balls is known to go directly from solid form to gaseous form is known as sublimation
Strong intermolecular forces result in liquids and solids true
weak intermolecular forces result in gases true
Three fundamental types of intermolecular forces in order of increasing strength are Dispersion force, dipole-dipole, hydrogen bond
Which intermolecular force is present in all molecules and atoms Dispersion forces
Substance A is a molecular compound that dissolve in gasoline but not in water. The molecules of A are very likely Nonpolar
Polar molecules with hydrogen atoms bonded to fluorine, oxygen, or nitrogen are hydrogen bond true
Which molecule below has hydrogen bonding NH3, HOH, CH3OH
The ability to sodium chloride to mix with water is most likely due to Ion-Dipole force
DNA consists of two strands wrapped around each other, each stand is held together by hydrogen bonds
Dry ice is which type of solid molecular solid
Which substance below is an ionic solid MgO
Which intermolecular force is the strongest Ion-Dipole force
Copper is which type of solid metallic atomic solid
Water has a --- molar mass Low
Water has --- boiling point high
Water --- during freezing expand
Why is water an unusual molecule No molecule of similar size as a liquid at room temperature, no molecule of similar size has as high a boiling point, water can dissolve many polar and ionic compounds
The reason for many of the unique properties of water is The ability to form hydrogen bonds
Created by: user-1984338
 

 



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