Chemistry Final
What is the wavelength of a 142-g baseball traveling at 90.7 mph? (1 mi=1.609 km, h=6.63 x 10^-34 Js) a) 3.13 x 10^37 m b) 1x 10^-34 m c) 1.15 x 10^-37 m d) 8.68 x 10^33 m e) 3.2 x 10^-38 m
b) 1x 10^-34 m
Identify the spectator ion(s) in the following reaction: Zn(OH)2 (s) + 2K+ (aq) + 2OH- (aq) ---> 2K+ (aq) + Zn(OH)4- (aq) a) K+ and Zn(OH)4(2-) b) K+ c) Zn(OH)2 d) Zn(OH)4 (2-) e) K+ and OH-
b) K+
The correct name for LiCl is a) monolithium chloride b) lithium chloride c) lithium (I) chloride d) monolithium monochloride e) lithium monochloride
b) lithium chloride
A 0.0106-mol sample of urea, NH2CONH2, contains a) 6.02 x 10^23 molecules b) 2.55 x 10^22 molecules c) 5.10 x 10^22 atoms d) 2.55 x 10^23 atoms e) 1.06 x 10^24 atoms
c) 5.10 x 10^22 atoms
Choose the group containing the most reactive nonmetals. a) Group 5A b) Group 3A c) Group 7A d) Group 8A e) Group 1A
c) Group 7A
A 4.215 g sample of a compound containing only carbon, hydrogen, and oxygen is burned in an excess of dioxygen, producing 9.582 g CO2 and 3.922 g H2O. What percent by mass of oxygen is contained in the original sample? a) 27.54% b) 32.75% c) 12.73% d) 13.42% e) 6.939%
a) 27.54%
What is the mass in grams of one prophene, C3H6, molecule? a) 6.99 x 10^-23 g b) 2.53 x 10^25 g c) 44.0 g d) 42.0 g e) 1.99 x 10^-23 g
a) 6.99 x 10^-23 g
Which of the following statements are incorrect? a) As the energy of a photon increases, its frequency decreases. b) As the wavelength of a photon increases, its energy decreases. c) The product of wavelength and frequency of electromagnetic radiation is a constant. d) As the wavelength of a photon increases, its frequency decreases. e) As the frequency of a photon increases, it wavelength decreases.
a) As the energy of a photon increases, its frequency decreases.
When an electron in an atom makes a transition from n=4 to n=5, which of the following statements is/are correct? I. Energy is emitted II. Energy is absorbed III. The electron loses energy IV. The electron gains energy V. The electron cannot make this transition a) II and IV b) II and III c) I and IV d) I and III e) V
a) II and IV
Which of the following statements is true? a) The krypton 1s orbital is smaller than the helium 1s orbital because kypton's nuclear charge draws the electrons closer. b) The krypton 1s orbital is smaller than the helium 1s orbital because krypton's p and d orbitals crowd the s orbitals. c) The krypton 1s orbital and the helium 1s orbital are the same size because s orbitals can have only 2 electrons. d) The krypton 1s orbital is larger than the helium 1s orbital because krypton contains more electrons. e) The krypton 1s orbital is larger than the helium 1s orbital because krypton's ionization energy is lower so it's easier to remove electrons.
a) The krypton 1s orbital is smaller than the helium 1s orbital because kypton's nuclear charge draws the electrons closer.
Identify the true statement(s) about the periodicity in the main-group elements. 1. The metallic character of elements decreases from left to right in any row of the periodic table. 2. The metallic character of elements increases from top to bottom in any column of the periodic table. 3. Elements with high ionization energy tend to be metallic, whereas those with low ionization energy tend to be nonmetallic. a) 1 only b) 2 only c) 3 only d) 1 and 2 e) 1 and 3
d) 1 and 2
Which of the following is/are correct postulates of Bohr's theory of the hydrogen atom? 1. The energy of an electron in an atom is quantized (i.e. only specific energy values are possible). 2. The principal quantum number (n), specifies each unique energy level. 3. An electron transition from a lower energy level to a higher energy level results in an emission of a photon of light. a) 1 only b) 2 only c) 3 only d) 1 and 2 e) 1, 2, and 3
d) 1 and 2
The measurements of three different masses on three different balances are 1.21 kg, 536 mg, and 23.14 g. The total mass should be reported as: a) 1233.68 g b) 1234 g c) 1233.7 g d) 1.23 x 10^3 g e) 1233.676 g
d) 1.23 x 10^3 g
How many electrons does a sulfide ion have? a) 13 b) 22 c) 16 d) 18 e) 2
d) 18
What is the energy per mole of photons with a wavelength of 307.1 nm? (c=3.00x10^8 m/s, h=6.63x10^-34 Js, Na=6.02x10^23 mol^-1) a) 6.48 x 10^-19 kJ/mol b) 1.85 x 10^14 kJ/mol c) 5.88 x 10^35 kJ/mol d) 9.77 x 10^14 kJ/mol e) 3.9 x 10^2 kJ/mol
e) 3.9 x 10^2 kJ/mol
Which of the following sets of four quantum numbers (n, l, ml, ms) correctly describes one of the valence electrons in a ground-state radium atom? a) 7 1 0 +1/2 b) 6 1 0 +1/2 c) 7 2 0 -1/2 d) 7 2 0 -1/2 e) 7 0 0 +1/2
e) 7 0 0 +1/2
Four cubes of equal mass are made of lead (density=11.3 g/cm^3), silver (10.5 g/cm^3), iron (7.90 g/cm^3), and aluminum (2.70 g/cm^3). Which cube hs the longest edge? a) lead b) iron c) silver d) all four cubes have the same length e)aluminum
e) aluminum