NEW
Font size
WorksheetsChem1A Exam Buster Part 3
Total questions: 15
Worksheet time: 40mins
Using VSEPR, what is the structure of CH4?
Octahedral
Linear
Bent
Tetrahedral
In C2H6, how many pi bonds are present in the bond between the carbon molecules?
1
2
3
0
What is the physical change occurring when dry ice is brought from its solid phase into its gaseous phase?
Melting
Boiling
Sublimation
Deposition
What is the hybridisation BF3 around the B atom?
sp
sp2
sp3
sp3d
Using the following phase diagram as a reference, at approximately what temperature and pressure is the triple point?
0.5 kPa, 140 degrees Celsius
70 atm, 310 degrees Kelvin
0.001 atm, 100 degrees Kelvin
0.5 atm, 140 degrees Kelvin
Using the diagram, if the substance is sitting at its triple point and there is a slight increase in temperature and the pressure remained constant, which state of matter would the substance most likely be in?
Solid
Liquid
Gas
Supercritical fluid
What is the freezing point of an aqueous NaCl solution if I dissolve 116.88g of NaCl (MW = 58.44) in 2.00kg of water? (Kf = 1.86 oC/m) Assume complete dissociation of the salt.
-1.86 oC
+1.86 oC
-3.72 oC
+3.72 oC
Which of the following is paramagnetic?
F2
O2
N2
Ne2
How many moles of helium gas is present in a volume of 67.2L under standard conditions?
4
3
2
1
What is the volume, in litres, occupied by 1.73 moles of N2 gas at 0.992 atm pressure and a temperature of 75.0oC?
10.7L
33.8L
49.8L
52.2L
The entropy will usually increase when
I. a molecule is broken into two or more smaller molecules.
II. a reaction occurs that results in an increase in the number of moles of gas.
III. a liquid changes to a solid.
IV. a liquid changes to a gas.
II only
II and III
II and IV
I, II, IV
Using the following figure, determine the bond order (BO) and the number of unpaired electrons in O2 and O22- . Which of the following is correct?
O2: BO = 2 and 2 unpaired electrons; O22- BO = 1.5 and 0 unpaired electrons
O2: BO = 2 and 2 unpaired electrons; O22- BO = 1 and 0 unpaired electrons
O2: BO = 2 and 0 unpaired electrons; O22- BO = 1 and 0 unpaired electrons
O2: BO = 2 and 2 unpaired electrons; O22- BO = 0 and 0 unpaired electrons
7.0 moles of helium gas, 1.0 mole of oxygen gas and 2.0 mole of fluorine gas in a container. The total pressure is 4 atm. Assuming fixed volume and temperature, the partial pressure of helium is:
0.28 atm
2.8 atm
0.280 atm
2.80 atm
Which of the following statements is false?
Energy is never destroyed in a reaction
Entropy is always increasing
Finding matter at absolute 0 is impossible
You cannot decrease the amount of order in the universe
Which bond angle would be the smallest in carbon dioxide?
Between the lone pair of electrons on the carbon and hydrogen atoms
Between the hydrogen atoms
Between the bonding pair of electrons on the carbon and the hydrogen
They have equal angles between each other
