An egg cooking, grass growing, and iron rusting are all examples of this.
A physical change
100
Out of the following gases, which one has the lowest molecular speed?
Ar,
N2,
Cl2
Cl2
100
How many unpaired electrons are there in the element Mn?
5
100
What is the energy called that is required to remove an electron from a gaseous atom?
Ionization energy
100
What is the correct name for SO3?
Sulfur trioxide
200
6.022 x 10^23 atoms in 1 mole of a substance, 360 degrees in a circle, 60 seconds in a minute, One 12C atom's mass is 12 amu.
All of these are examples of exact numbers except...
6.022 x 10^23 atoms in 1 mole of a substance
200
A sample gas occupies 5.00L at 300. K and 7.50 atm. If its temperature is raised to 600. K and its pressure is reduced to 2.50 atm, what is its new volume?
30.0 L
200
How many electrons in a multi-electron atom can the 4p sublevel hold?
6
200
In the molecule IF, suppose the electronegativity of the I atom is 2.9 and the electronegativity of the F atom is 4.0. The bond is:
Polar covalent
200
Which of the following compounds would make a good electrolyte solution when placed in water? NaI, O2, Fe(OH)2, AgCl
NaI
300
Name this acid: HClO4
Perchloric acid
300
Which of the following reactions is most likely to occur?
2 K+ + Fe --> 2 K + Fe2+,
Cu2++ 2 Li --> Cu + 2 Li+,
Ni + 2 H2O --> Ni(OH)2 + H2,
2 Ag + 2HNO3 --> 2AgNO3 + H2
Cu2++ 2 Li --> Cu + 2 Li+
300
According to the Heisenberg uncertainty principle, if the uncertainty in the speed of a proton is 950 m/s, the uncertainty in its position is approximately
3.32 x 10-11m
300
How many atomic orbitals are used to form the hybrid orbitals in a trigonal bipyramid electron group arrangement?
Five
300
What is the full set of quantum numbers for the last electron added to form the F atom?
n=2, l=1, ml=0, ms=-1/2
400
This scientist experimented with gold foil and alpha particles and discovered the nucleus of an atom.
Rutherford
400
Which of the following ionic substances is least soluble?
CuSO4,
CoSO4,
BaSO4,
Na2SO4
BaSO4
400
Using standard enthalpies of formation in the table shown, calculate dHrxn for the following reaction:
2H2S(g) + 3 O2(g) --> 2 SO2(g) + 2H2O(g)
-1036 kJ
400
Describe the type(s) of bond(s) connecting the two carbon atoms in acetylene (C2H2)
One sigma, 2 pi
400
Which period 3 element would be most likely to have the following successive IEs (in kJ/mol):
IE1 = 600, IE2 = 650, IE3 = 10,000, IE4 = 11,000, IE5 = 12,000
Mg
500
An unknown sample is composed of 13.3 g of phosphorus (P) and 40.8 g of Fluorine (F). The empirical formula is
PF5
500
40.00 mL of a 0.500 M Ca(OH)2 solution are titrated with 0.800 M HCl solution. They react as follows:
Ca(OH)2 +2 HCl(aq) --> Ca(Cl)2(aq) + 2H2O(l)
At equivalence point, how many mL of HCl solution have been dispensed?
50.00 mL
500
Use Hess' law and the reactions provided below to calculate dHrxn for the following rxn:
CO + H2CO3 --> H2 + 2 CO2
Given: CO2 --> CO + 1/2 O2, H2CO3 --> CO2 + H2 + 1/2 O2
-319 kJ
500
Based on your knowledge of molecular orbitals, which of the following species cannot exist? Be2, B2, H2+, C2+
Be2
500
What is the hybridization of nitrogen in NH3 (N in the center)?