exam one
62 n, 47 e, 47 p
Ag10947
Which one of the following represents an allowed set of quantum numbers for an electron in an atom? (arranged as n, l, ml, and ms)
A. 2, 2, -1, 1/2
B. 3, 2, 0, 1/2
C. 3, 2, 3, 1/2
D. 1, 1, -2, -1/2
E. none of these
B
Of the three species, which would be isoelectronic with C (could be more than one) ?
(a) N+ (b) F- (c) Ne2-
N+
Which of the following series of atoms are arranged in order of increasing size?
A. C < Be < Li
B. F < P < Cl
C. K < Ga < In
D. Na < Mg < Ca
E. none of these
A
How many moles of potassium chloride are present in 16.4 grams of KCl?
0.220 mol
Given the equation below, what is DH for burning 16.0 g of C2H2(g) (mm=26.0 g/mol) in excess O2(g)?
2C2H2(g) + 5O2(g) >> 4CO2(g) + 2H2O(l)
DH = -2600 kJ
-800 kJ
How many electrons (both bond and lone pairs) are used in the Lewis structure of ClO4- ?
32
Which of the series written below is in order of increasing first ionization energy (atoms with the smallest ionization energy first)?
A. Mg < Na < P
B. Be < F < P
C. K < Br < Ge
D. F < N < B
E. none of these
E
How many grams of NaCl (mm=58.4 g/mol) are needed to make 0.50 L of a 0.052 M NaCl solution?
1.52 g
How much heat must be added to a 5.99 g piece of gold (specific heat = 0.129 J/g·K) to raise its temperature from 25.00 °C to 34.00 °C?
6.95 J
Pick the best answer (connectivity correct as shown) for the three Lewis structures shown below
b and c, not a
The electron configuration of Si2+ may be represented as:
what is the correct formula for sodium phosphate?
Na3PO4
What volume of O2 gas is obtained at 50°C and 1.00 atm of pressure from heating 2.30 g of KClO3 (mm=122.5 g/mol)?
(unbalanced expression is KClO3(s) >> KCl(s) + O2(g), you need to balance it)
746 mL
Which of the molecules listed below is polar?
A. SiF4
B. AsF5
C. CH4
D. H2Se
E. all are non-polar
D) H2Se
What is the ratio of c/b where c and b represent the coefficients of the balanced equation for the reactants in this combustion reaction.
a C2H6O + b O2 >> c CO2 + d H2O
2/3
How many mL of 1.00 molar HCl will exactly neutralize 0.472 g of calcium hydroxide (mm=74.1 g/mol) (write the equation, get all the formulas of reactants and products correct)?
12.7 mL
If an ideal gas occupies 1.0 liters at a temperature of 51°C, what is the volume at constant pressure at 27°C?
0.93 L
The correct Lewis structure for the molecule HOClO (H-O-Cl-O) is an expanded valence shell molecule with no formal charges and how many sigma bonds, pi bonds, and lone pairs?
3 sigma, 1 pi, 6 lone pairs
What is the theoretical yield of K2O (mm=94.2 g/mol) formed when 3.04 g of K (am=39.1 g/mol) reacts with excess O2? There are no other products.
3.66 g