CHAPTER 4 CHEMISTRY Flashcards
what would have a definite shape and a definite volume at STP
a solid
what would take the shape of and occupy the whole volume of its container
gas
as a substanced changes from a liquid to a gas, the average distance between molecules
increases
in which phase are the particles the most random
gas
what would be an endothermic phase change
liquid to gas
what wouldnt be considered a form of energy
temperature
what unit is used to express the amount of energy absorbed or released during a chemical reaction
joule
what is a form of energy
heat
the minimum number of fixed reference points required to establish the celcius temperature scale for a thermometer is
2
what are the fixed reference points on the celcius thermometer
0 and 100
the difference between the boiling point and the freezing point of pure water at standard pressure is
100K
what is the freezing point of water of the kelvin scale at standard pressure
273 K
when the temperature of an object changes ny 100 degrees celcius, the same temperature change in kelvins would be
100K
different masses of copper and iron have the same temperature. compared to the average kinetic energy of the copper atoms, the average kinetic energy of the iron atoms it
the same
how many joules of heat energy are released when 50 g of water are cooled from 70 degrees celcius to 60 degrees celcius
2.09 x 10^3
a sample of water is heated from 10 degrees celcius to 15 degrees celcius by the addition of 125 J of heat. What is the mass of the water
5.98g
what is the temperature change if 3 g of water absorbed 15J of heat
1.196
what is the total number of kilojoules required to completely boil 100g of water at 100 degrees celcius and 1 atmosphere
226,000
at a constant pressure, how does the volume of 1 mole of an ideal gas vary
directly with the kelvin temperature
a gas has a volume of 2 liters at 323 K and 3 atmospheres. what will be the new volume if the temperature is changed to 273 K and the pressure is changed to 1 atmosphere
5
what is a to b on a heating curve
solid
what is b to c on a heating curve
melting
what is c to d on a heating curve
liquid
what is d to e on a heating curve
liquid to gas, boiling
