Praxis 5246 Chemistry Practice Test |
Questions and correct detailed Answers |
2026/27 Study Updates | 100% Pass Guarantee
kinetic energy - ANSWER- -KE=1/2mv^2
Kinetic Molecular Theory - ANSWER- -1. molecules are in constant random motion
2. ideal gas molecules have a negligible volume compared to the volume of the gas itself
3. exert no attractive or repulsive forces on each other
4. molecules have a KE/the higher the temp, the higher the energy
5. molecules have perfectly elastic collisions
Ideal Gases - ANSWER- -a hypothetical gas whose molecules occupy negligible space and
have no interactions, and that consequently obeys the gas laws exactly.
Avogadro's Law - ANSWER- -V1/n1=V2/n2 (direct) [Volume & moles of gas]
Boyle's Law - ANSWER- -P1V1=P2V2 (inverse) [pressure & volume]
Charles's Law - ANSWER- -A principle that describes the relationship between the
temperature and volume of a gas at constant pressure [volume & temp]
Vi/Ti = Vf/Tf
Combined Gas Law - ANSWER- -P1V1/T1 = P2V2/T2 (Charles's and Boyle's Laws combined)
, Ideal Gas Law - ANSWER- -PV=nRT (Boyle's, Charles's and Avogadro's Laws combined)
R in PV=nRT - ANSWER- -0.0821 L*atm/mol*K
P in PV=nRT - ANSWER- -pressure (atm)
V in PV=nRT - ANSWER- -Volume (L)
n in PV=nRT - ANSWER- -moles (mol)
T in PV=nRT - ANSWER- -Temperature (K)
heating curve - ANSWER- -a diagram that shows the temperature changes and changes of
state of a substance as it is heated
ΔHvap = heat of vaporization - ANSWER- -quantity of energy required to convert one mol of
a substance from a liquid to a gas (liquid --> gas)
ΔHfus= heat of fusion - ANSWER- -amount of heat that must be added to one mole of
substance to change the substance from the solid phase to the liquid phase (solid --> Liquid)
ΔHsub= heat of sublimation - ANSWER- -amount of heat that must be added to one mole of
a substance to change the substance directly from the solid phase to the gaseous phase without
passing through the liquid phase (solid --> gas)
Q in Q= mcΔT - ANSWER- -amount of heat gained in joules
Questions and correct detailed Answers |
2026/27 Study Updates | 100% Pass Guarantee
kinetic energy - ANSWER- -KE=1/2mv^2
Kinetic Molecular Theory - ANSWER- -1. molecules are in constant random motion
2. ideal gas molecules have a negligible volume compared to the volume of the gas itself
3. exert no attractive or repulsive forces on each other
4. molecules have a KE/the higher the temp, the higher the energy
5. molecules have perfectly elastic collisions
Ideal Gases - ANSWER- -a hypothetical gas whose molecules occupy negligible space and
have no interactions, and that consequently obeys the gas laws exactly.
Avogadro's Law - ANSWER- -V1/n1=V2/n2 (direct) [Volume & moles of gas]
Boyle's Law - ANSWER- -P1V1=P2V2 (inverse) [pressure & volume]
Charles's Law - ANSWER- -A principle that describes the relationship between the
temperature and volume of a gas at constant pressure [volume & temp]
Vi/Ti = Vf/Tf
Combined Gas Law - ANSWER- -P1V1/T1 = P2V2/T2 (Charles's and Boyle's Laws combined)
, Ideal Gas Law - ANSWER- -PV=nRT (Boyle's, Charles's and Avogadro's Laws combined)
R in PV=nRT - ANSWER- -0.0821 L*atm/mol*K
P in PV=nRT - ANSWER- -pressure (atm)
V in PV=nRT - ANSWER- -Volume (L)
n in PV=nRT - ANSWER- -moles (mol)
T in PV=nRT - ANSWER- -Temperature (K)
heating curve - ANSWER- -a diagram that shows the temperature changes and changes of
state of a substance as it is heated
ΔHvap = heat of vaporization - ANSWER- -quantity of energy required to convert one mol of
a substance from a liquid to a gas (liquid --> gas)
ΔHfus= heat of fusion - ANSWER- -amount of heat that must be added to one mole of
substance to change the substance from the solid phase to the liquid phase (solid --> Liquid)
ΔHsub= heat of sublimation - ANSWER- -amount of heat that must be added to one mole of
a substance to change the substance directly from the solid phase to the gaseous phase without
passing through the liquid phase (solid --> gas)
Q in Q= mcΔT - ANSWER- -amount of heat gained in joules
