Phases and Substances
Which of the following cannot be used as a differentiating property?
A) density
B) melting point
C) chemical reactivity
D) hardness
E) temperature
E) Temperature
Temperature is not unique to a substance. A substance could be at different temperatures depending on its environment. Also, different substances could have the same temperature
_______ of configuration and _____ energy are favored in PEC diagrams
Higher number of configurations and lower energy are favored in PEC diagrams
What is the molar mass of oxygen?
16
Estimate the volume of 1 mol of an ideal gas at 0 degrees celsius and 1 atm
22.4L
Boiling of a liquid occurs when its _________ equals the ____________
Boiling of a liquid occurs when its vapor pressure equals the atmospheric pressure
When particles are experiencing attraction, ________ is greater when ______ between particles is increased.
When particles are experiencing attraction, potential energy is greater when the distance between particles is increased.
How many particles are present in one mole of oxygen gas (O2)
6.022 x 1023 (Avogadro's number)
A gas in a 5 L container at 10 degrees celsius is at 1 atm. If the temperature in the container is raised to 20 degrees celsius and the volume is doubled, what is the final pressure?
Final pressure is 1 atm
We assume that each substance, no matter how simple or complex, has at least one ________________ that makes it unique
differentiating characteristic
When two particles experience ____, a smaller distance between the two particles results in a greater potential energy
repulsion
Determine the molar mass of a substance with formula C5H12O
88.14
When temperature decreases, the average kinetic energy ______. Attractive forces between particles are then able to ______ them ______.
During a phase change kinetic energy ______ while potential energy ________
Draw a graph showing the distribution of particles of 3 different gases with different masses at the same temperature. Label which gas has the lowest and highest mass.
Use fraction of particles on the y-axis and velocity on the x-axis
Gas with lowest mass should have a bigger fraction of particles moving at higher velocities. Gas with highest mass should have a bigger fraction of particles moving at a slower velocity.
How many moles of H2O are in 5 liters of water? 1L=1000mL and 1mL=1g of water.
278 moles
Determine the volume of occupied by 2.34 grams of carbon dioxide gas at STP.
1.19 L