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Flashcards for Chapter 12 in Chemistry
Flashcards for Chemistry Chapter 12 in Mrs. Jackson's Chemistry Class
55
Chemistry
10th Grade
02/14/2012

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Term
What is atmosphere?
Definition
the unit that is often used to report air pressure (atm)
Term
What is a barometer?
Definition
Instrument used to measure atmoshperic pressure
Term
What is Dalton's law of partial pressure?
Definition
States that the total pressure of a mixture of gases is equal to the sum of the pressures of all the gaes in the mixture
Term
What is diffusion?
Definition
the movement of one material through another from an area of high concentration to an area of low concentration
Term
What is effusion?
Definition
related to diffusion- it is where gas escapes through a tiny opening
Term
What is elastic collision?
Definition
Elastic collision is a collision between particles in which no kinetic energy is lost
Term
What is Graham's law of effusion?
Definition
States that the rate of effusion for a gas is invertly proportional to the square root of its molar mass
Term
What is the kinetic molecular theory?
Definition
Describes the behavior of matter interms of particles in motion
Term
What is a pascal?
Definition
N/cm2
Term
What is pressure?
Definition
Force per unit area
Term
What is temperature?
Definition
a measure of the average kinetic energy of the particles in matter
Term
What is a dipole-dipole force?
Definition
Attraction between oppositely charged regions of polar molecules and is stronger than dispersion forces
Term
What is a dispersion force?
Definition
Weak force that results from temporary shifts in the density of electrons in electron clouds
Term
What is a hydrogen bond?
Definition
a type of dipole-dipole attraction that occurs between molecules containing a hdrogen atom bonded to a small, highly electronegative atom with at least one lone eletron pair
Term
What is an allotrope?
Definition
an element thatesists in different forms at the same state
Term
What is an amorphous solid?
Definition
a solid in which the particles aren't arranged in a regular repeating pattern
Term
What is a crystalline solid?
Definition
Solid whose atoms/ions/molecules are arranged in a n orderly geometeric structure
Term
What is a surfactant?
Definition
compound that lowers the surface tension of water
Term
What is surface tension?
Definition
the energy required to increase the surface area of a liquid by a given amount; a measure of the inward pull by particles in the interior
Term
What is a unit cell?
Definition
smallest arrangement of atoms in a crystal lattice that has the same symmetry as the whole crystal
Term
What is viscosity?
Definition
the measure of the resistance of a iquid to flow that is determined by the type of intermolecular forces in the liquid, the size and shape of the particles, and the temperature
Term
What is a boiling point?
Definition
the temperature at whi9ch the vapor pressure of a liquid equals the external/atmospheric pressure
Term
What is condensation?
Definition
the process by which a gas/vapor becomes a liquid
Term
What is deposition?
Definition
the process where a substance changes from a gas/vapor to a solid without first becoming a liquid
Term
What is evaporation?
Definition
when vaporization occurs only at the surface of the liquid
Term
What is a freezing point?
Definition
the temperature at which a liquid is converted into a crystalline solid
Term
What is a melting point?
Definition
the temperature at which the forces holding its crystal lattice together are broken and it becomes a liquid
Term
What is a phase diagram?
Definition
a graph of pressure vs. temperature that shows in which phase a substance exists under different condisions of temperature and pressure
Term
What is a triple point?
Definition
the point at which 3 phases of a substance can coexist
Term
What is vaporization?
Definition
the process by which a liquid changes to a gas or vapor
Term
What are the 2 types of vaporization?
Definition
Evaporation and Boiling
Term
What is vapor pressure?
Definition
the pressure exerted by a vapor over a liquid
Term
What is a critical point?
Definition
the point that indicates the critical pressure and temperature which a substance can't exist as a liquid
Term
What are the basic assumptions proposed by the kinetic molecular theory?
Definition
1. Gases consist of small particles that are separated from one another by empty space
2. Gas particles are in constant motion and collisions between particles are elastic
3. Temperature is a measure of the average kinetic energy of the particles in matter
Term
What is the kinetic equation?
Definition
KE=(1/2)mv2 this says the kineteic energy equals one half times mass times velocity squared
Term
What is Graham's law formula?
Definition
Term
What is a monometer?
Definition
an instrument used to measure gas pressure in a closed conatiner
Term
What is pressure measured in when using a barometer??
Definition
mmHg (millimeter of mercury)
Term
what is the measurement of pressure named after the inventor of the barometer?
Definition
Torre (this is the same as mmHg)
Term
What is the unit of pressure that is abbreviated Pa?
Definition
Pascals
Term
What is the measurement of the average pressure of air at sea level (standard pressure) called?
Definition
atmospheres (atm)
Term
What is temperature directly proportional with?
Definition
kinetic energy
Term
What is the type of force that holds particles together in ionic, covalent, and metallic bonds called?
Definition
Intramolecular force
Term
What is the force that holds together identical particles/ 2 different types of particles together?
Definition
Intermolecular forces
Term
What is the shape of the molecule dependent on?
Definition
the type of molecular force the molecule has
Term
The thicker the liquid, the higher the what?
Definition
viscosity
Term
What is a molecular solid?
Definition
a crystalline solid in which the molecules are held together by intermolecular forces
Term
What is a covalent network solid?
Definition
a crystalline solid that is able to form multiple covalent bonds between molecules
Term
What is an ionic solid?
Definition
a crystalline solid that is able to form ionic bonds with all other surounding ions
Term
What is a metallic solic?
Definition
a crystalline solid in which a positive metal ion is surrounded by a sea of mobile electrons
Term
What are the 2 types of fluids?
Definition
gases and liquids because they both flow
Term
What is the difference between cohesion and adhesion?
Definition
Cohesion describes the force of attraction between identical molecules and adhesion describes the force of attraction between different molecules
Term
What is melting?
Definition
when a solid becomes a liquid because the forces holding the crystal lattice together are broken
Term
What is Sublimation?
Definition
a solid changes directly to a gas without first becoming a liquid
Term
What is freezing?
Definition
when molecules lose kinetic energy and go from a liquid to a solid
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