Phase UR Fears
Give the definition for each of the following terms
Freezing
Sublimation
Condensation
Liquid to solid
Solid to Gas
Gas to Liquid
If Pressure increases by 3x what happens to Temperature?
A) decreases by a factor of 3
B) increases by a factor of 3
C) increases by a factor of 9
D) decreases by a factor of 9
B increases by a factor of 3
What happens to Kinetic energy during a phase change?
Nothing.
Which of the following is not a compound?
A) HCl
B) Cl
C) NaCl
D) CO2
B. Cl
How many moles are in 5.4198x10^24 particles?
9 moles
Which of the following in NOT an intensive property?
A) Density
B) Melting Point
C) Mass
D) Boiling point
C mass
As temperature decreases by a factor of 4 what happens to volume?
A) Increases by a factor of 2
B) Increases by a factor of 4
C) Decreases by a factor of 4
D) Stays the same
B increases by a factor of 4
Draw a PEC that for the most unstable and stable compound.
Top Left= Most unstable
Bottom Right= most stable
What is the molar mass of ethanol? (C2H5OH)
46 grams
Which one of these compounds has the most particles?
A)18 g of H2O
B) 1 mol of CO2
C) 58g of NaCl
D) All have the same amount of particles
D they all have the same amount of particles
What happens to Delta E as a phase change occurs?
A) slopes upward
B) slopes downward
C) goes vertical
D) goes horizontal
C it goes vertical as a phase change occurs
5 million particles are filled in a container held at 10°C and 25 atm, what is the volume of this container?
7.81x10^-16 L
For each of the phase changes, state what happens to PE.
Melting
Vaporization
Deposition
Increases
Increases
Decreases
Rank the following from highest molar mass to lowest:
NaOH /UF6 / CH3COCH3
UF6 > CH3COCH3 > NaOH
How many grams are in 4.5 moles of NaF?
188.95 g
Refer to powerpoint for graph. Oops a student forgot to add values to his graph! Using logic what two states could this compound be in at point X
Liquid or gas
A container with an initial volume of 5 L is placed in a different environment where the pressure is halved and temperature is quadrupled. What is the final volume?
40 L
Refer to picture on the screen.
Compounds are in an isolated system. Given the graph above rank the compounds from highest to lowest PE (assume all of the compounds have the same total energy)
A>C>B
Salt water boils and the water completely evaporates, salt (NaCl) is left in the bottom of the beaker. Which of the following is left in the beaker?
A) Compound
B) Mixture
C) Element
D) None of the above
A. Compound
How many particles are in 15 g of Lithium (Li)?
1.32x10^24 particles
Refer to the Picture on the powerpoint.
Show what state each line is and for the ones not in gas phase, estimate their boiling points.
Gas: ABC Liquid: DE
BPs: 17°C for D and 25°C for E
A Helium balloon is filled up on a hot day (30°C) and the pressure inside the balloon is 2000 mmHg. If the volume of this balloon is .75 L. How much does this balloon weigh?
3.05x10^-3 grams
Briefly explain what happens to PE when temperature is increased.
Increases slightly because the particles are speeding up and increasing volume slightly, raising PE slightly.
Which of the following is false?
A) H20 is a chemical compound
B) In 2 mixtures of the same kind, they have different proportions of particles
C) O2 is an atomic elementary substance
D) Elements cannot be broken down any further
E) Ionic compounds form lattice networks
C) O2 is an atomic elementary substance
On a hot day, I stay hydrated by drinking 2.4 L of water. How many mols of water did I drink? (assume density of H2O is 1 g/mL)?
133.33 mols