chem exam 1
What terms defines a mass which is exactly equal to 1/12 the mass of one carbon-12 atom?
Atomic mass unit
Which of the following is a nonmetal? Li, Br, Hg, Bi, Na
Bromine
Five vials each contain 12 grams of a solid metal sample. The samples include calcium, platinum, barium, gold, and silver. Which vial has the most metal atoms?
Calcium
The orbital diagram for a ground-state carbon atom is 1s 2s 2p A ↿⇂ ↿⇂ ↿⇂ B ↿⇂ ↿ ↿ ↿ ↿ C ↿⇂ ↿⇂ ↿ ↿ ↿ D ↿⇂ ↿⇂ ↿ ↿ E ↿⇂ ↿⇂ ↿⇂ ↿⇂ ↿
D
Which one of the following sets of quantum numbers can correctly represent a 3p orbital? A B C D E n = 3 n = 1 n = 3 n = 3 n = 3 l = 1 l = 3 l = 2 l = 1 l = 0 ml = 2 ml = 3 ml = 1 ml = -1 ml = 1
D, n=3, l=1, ml= -1
Which element has the following ground-state electron configuration? [Kr]5s24d105p3
Sb
The electron configuration of a ground-state copper atom is
[Ar]4s13d10
The elements in Group 2A are known by what name?
alkaline earth metals
What cannot be separated into simpler substances by chemical means?
element
Millikan's oil-drop experiment
established the charge on an electron
What is not an SI base unit?
gram
Hund's rule states that the most stable arrangement of electrons in orbitals of equal energy is the one in which the number of electrons with parallel spin is ______________.
minimized
Which of the following is a correct set of quantum numbers for an electron in a 5f orbital?
n = 5, l = 3, ml = +1
What element is represented by X in the atomic symbol notation 195/78 X ?
platinum
What is the energy possessed by an object by virtue of its position?
potential energy
Select the arrangement of electromagnetic radiation which starts with the lowest energy and increases to the greatest energy.
radio, infrared, ultraviolet, gamma rays
Which ground-state atom has an electron configuration described by the following orbital diagram? [Ar] ↿⇂ ↿⇂ ↿⇂ ↿⇂ ↿⇂ ↿⇂ ↿⇂ ↿ ↿ 4s 3d 4p
selenium
The orientation in space of an atomic orbital is associated with
the magnetic quantum number (ml).
The size of an atomic orbital is associated with
the principal quantum number (n).
What element is represented by the electron configuration 1s22s22p63s23p64s23d104p65s14d10?
Ag
Acetic acid boils at 244.2°F. What is its boiling point in degrees Celsius?
117.9 C
Select the answer that expresses the result of this calculation with the correct number of significant figures. 13.602 x 1.90 x 3.06 -------------------------------- 4.2 x 1.4097
13
Acetone, which is used as a solvent and as a reactant in the manufacture of Plexiglas®, boils at 56.1°C. What is the boiling point in degrees Fahrenheit?
133 F
How many moles are in 8.73 × 1025 atoms of boron, B?
145 moles
The average distance between the Earth and the Moon is 240,000 miles. Express this distance in meters. (1 mi = 1609 m)
3.9 × 108 m
Consider the isotope bromine-81, Br81/35. Select the combination which lists the correct atomic number, number of neutrons, and mass number, respectively.
35, 46, 81
Isopropyl alcohol, commonly known as rubbing alcohol, boils at 82.4°C. What is the boiling point in kelvins?
355.6 K
A large pizza has a diameter of 15 inches. Express this diameter in centimeters. (1 in = 2.54 cm)
38 cm
How many significant figures are in 0.006570?
4
How many electrons are there in the 3rd principal energy level (n = 3) of a phosphorus atom?
5
The number of orbitals in a d subshell is
5
Which is correct if 52.068881 is rewritten in scientific notation and rounded to three significant figures?
5.21 x 10 1
How many milliliters is 0.0055 L?
5.5 mL
A radio wave has a frequency of 8.6 × 108 Hz. What is the energy of one photon of this radiation? (h = 6.63 × 10-34 J • s)
5.7 × 10-25 J
Express 122.0°F in °C.
50.0°C
How many hertz is 600.11 MHz?
6.0011 × 10 8 Hz
Determine the number of protons, electrons, and neutrons for the isotope gold-118. The symbol for gold is Au.
79 protons, 79 electrons, 39 neutrons
If a patient in the hospital is running a temperature of 39.5°C, what is this in degrees Fahrenheit?
103.1°F
How many inches are in 382.5 cm? (1 in = 2.54 cm)?
150.6 in
What is the term for the total number of neutrons and protons in the nucleus of each atom of an element?
Mass number
How do you find the mass number?
protons + neutrons
If the density of corn syrup is 1.380 g/mL and a sample of corn syrup has a mass of 32 grams, what is the volume of corn syrup, in liters?
0.023 L
The result of (3.8621 × 1.5630) - 5.98 is properly written as
0.06
How many moles are present in 17.4 g of lead?
0.0840 moles
What is the maximum number of electrons in an atom that can have the following set of quantum numbers? n = 4, l = 3, ml = -2, ms = +1/2
1
What does 1 nanometer equal?
1 x 10 -9 m
How many hertz are in 1 MHz ?
1,000,000
According to the Heisenberg uncertainty principle, if the uncertainty in the speed of an electron is 3.5 × 103 m/s, the uncertainty in its position (in m) is at least ___________. (mass of an electron = 9.11 × 10-28 g)
1.7 × 10-8 m
Which of the following in not a magic number? 20 10 126 82 2
10
The SI prefixes milli- and mega- represent, respectively
10 -3 and 10 6
How many grams in a liter?
1000
What is the volume of a container that contains 14.3 g of a substance having a density of 0.988 g/cm3?
14.5 cm
Which is correct if 15,390,000 is rounded to two significant figures?
15,000,000
An atom of the isotope sulfur-31 consists of how many protons, neutrons, and electrons?
16 p, 15 n, 16 e
Give the number of protons (p), electrons (e), and neutrons (n) in one atom of chlorine-37.
17 p, 17 e, 20 n
What is the electron configuration for bromine?
1s22s22p63s23p64s23d104p5
The Pauli exclusion principle states that no ____ electrons within an atom can have the same ____ quantum numbers.
2, 4
Determine the number of protons and identify the correct symbol for an atom with 20 neutrons and 20 electrons.
20 protons, 20/40 Ca
What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm? (c = 3.00 × 108 m/s; h = 6.63 × 10-34 J • s; NA = 6.022 × 1023 moles-1)
246 kJ
The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h? (1 mile = 1609 m)
25,300 mi/hour
Which isotope is not possible? 1/1 H 2/1 H 52/24 Cr 25/54 Mn All of these isotopes are possible.
25/54 Mn
Select the answer with the correct number of decimal places for the following sum: 13.914 cm + 243.1 cm + 12.00460 cm =
269.0 cm
Calculate the atomic mass of silicon. Isotope Isotopic Mass (amu) Abudance % 28Si 27.976927 92.22 29Si 28.976495 4.69 30Si 29.973770 3.09
28.0855 amu
How many atoms are in 0.534 mol of nickel, Ni?
3.22 × 1023 atoms
The average distance between the Earth and the Moon is 240,000 miles. Express this distance in kilometers. (1 mi = 1609 m)
3.9 × 105 km
How many significant figures does the sum 8.5201 + 1.93 contain?
4
The number 1.050 × 10 9 has how many significant figures?
4
What is the wavelength of radiation that has a frequency of 6.912 × 1014 s-1? (c = 3.00 × 108 m/s)
4.337 × 10 2 nm
Calculate the frequency of visible light having a wavelength of 686 nm. (c = 3.00 × 108 m/s)
4.37 × 10 14 s-1
A geology student found an irregularly shaped rock, with a mass of 28.63 grams, and placed it into a graduated cylinder containing 13.31 mL of water. If the water level increased to 19.73 mL after the rock was placed in the cylinder, what is the density of the rock, in g/mL?
4.46 g/ml
50.0 grams of acetic acid are required for an experiment. What volume, in milliliters, of a 1.105 g/cm3 acetic acid solution must be measured for the experiment?
45.2 mL
How many grams are present in 0.885 moles of manganese?
48.6 g
Which of the following subshells has the highest energy in the element tantalum?
4f
How many electrons are in the 4d orbitals of Tc?
5
Lithium forms compounds which are used in dry cells, storage batteries, and in high-temperature lubricants. It has two naturally occurring isotopes, 6Li (isotopic mass = 6.015123 amu) and 7Li (isotopic mass = 7.016005 amu). Lithium has an atomic mass of 6.9412 amu. What is the percent abundance of lithium-6?
7.47%
What is the volume in milliliters of a 32.0 fl oz can of juice? (1 fl oz = 29.6 mL)
947 mL
Which one of the following sets of quantum numbers is not possible? n l ml ms A 4 3 -2 +1/2 B 3 2 -3 -1/2 C 3 0 0 +1/2 D 4 1 1 -1/2 E 2 0 0 +1/2
B
Which combination of neutrons and protons leads to the most number of stable nuclei?
Even number of neutrons and even number of protons
Which of the following is a metalloid? C, S, Ge, Ir, Br
Germanium
The elements in Group 7A are known by what name?
Halogens
If a liquid contains 60% sugar and 40% water throughout its composition then what is it called?
Homogeneous mixture
Which scientist proposed that energy of radiation is composed of extremely small indivisible packages called quanta? ("Quanta" is the plural of "quantum.")
Max Planck
Which of the following is a metal? N, P, As, Tl, Si
Tilanium
Which of the following elements has the largest number of unpaired electrons in the ground state?
V
Select the correct electron configuration for Te (Z = 52).
[Kr]5s24d105p4
Which is the correct electron configuration for gold?
[Xe]4f145d106s1
What is the term for the number of protons in the nucleus of each atom of an element? It also indicates the number of electrons in the atom
atomic number
Which of these elements is chemically similar to potassium? calcium arsenic phosphorus cerium cesium
cesium
The elements in a column of the periodic table are known as
groups
Atoms of the same element with different mass numbers are called
isotopes
Which ground-state atom has an electron configuration described by the following orbital diagram? [Ne] ↿⇂ ↿ ↿ ↿ 3s 3p
phosphorus
Rutherford's experiment with alpha particle scattering by gold foil established that
protons are not evenly distributed throughout an atom
How do you find charge?
protons minus electrons
J. J. Thomson studied cathode ray particles (electrons) and was able to measure the mass/charge ratio. His results showed that
the charge was always a whole-number multiple of some minimum charge
