Chemistry
Which one of the following is most likely to lose electrons when forming an ion?
Rh
Which species below is the sulfite ion?
SO3 -2
Which of the following compounds would you expect to be ionic?
SrCl2
Which species has 16 protons?
34S2-
Which species is an isotope of 39Cl?
36Cl-
Element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is __________ amu. Isotope Abundance Mass 38X 5.07 37.919 39X 15.35 39.017 42X 79.85 42.111
41.54
are __________ protons, __________ neutrons, and __________ electrons in 131I-.
53, 78, and 54
There are __________ electrons, __________ protons, and __________ neutrons in an atom of 132 54 Xe.
54, 54, 78
The element X has three naturally occurring isotopes. The isotopic masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is __________ amu. Isotope Abundance Mass 53X 19.61 52.62 56X 53.91 56.29 58X 26.48 58.31
56.11
In the symbol shown below, x = __________. 13 x C
6
The average atomic weight of copper, which has two naturally occurring isotopes, is 63.5. One of the isotopes has an atomic weight of 62.9 amu and constitutes 69.1% of the copper isotopes. The other isotope has an abundance of 30.9%. The atomic weight (amu) of the second isotope is __________ amu.
64.8
Aluminum reacts with a certain nonmetallic element to form a compound with the general formula Al2X3. Element X must be from Group __________ of the Periodic Table of Elements.
6A
An atom of the most common isotope of gold, 197Au, has __________ protons, __________ neutrons, and __________ electrons.
79, 118, 79
Which isotope has 36 electrons in an atom?
80 Kr 36
Which isotope has 45 neutrons?
80 br 35
The formula for a salt is XBr. The X-ion in this salt has 46 electrons. The metal X is __________.
Ag
Of the following, only __________ is not a metalloid.
Al
An unknown element is found to have three naturally occurring isotopes with atomic masses of 35.9675 (0.337%), 37.9627 (0.063%), and 39.9624 (99.600%). Which of the following is the unknown element?
Ar
Which one of the following is not one of the postulates of Dalton's atomic theory?
Atoms are composed of protons, neutrons, and electrons.
__________-rays consist of fast-moving electrons.
Beta
Which one of the following is a nonmetal?
Br
In the symbol below, X = __________. 13 6 X
C
Which one of the following molecular formulas is also an empirical formula?
C2H6SO
Which compounds do not have the same empirical formula?
CO, CO2
Which pair of substances could be used to illustrate the law of multiple proportions?
CO, CO2
Which pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties?
Ca, Sr
Which of the following compounds would you expect to be ionic?
CaO
Which one of the following compounds is chromium(III) oxide?
CrO3
Which one of the following compounds is copper(I) chloride?
CuCl
Which pair of elements below should be the most similar in chemical properties?
I and Br
Consider the following selected postulates of Dalton's atomic theory: (i) Each element is composed of extremely small particles called atoms. (ii) Atoms are indivisible. (iii) Atoms of a given element are identical. (iv) Atoms of different elements are different and have different properties. Which of the postulates is(are) no longer considered valid?
(ii) and (iii)
The charge on the iron ion in the salt Fe2O3 is __________.
+3
Silver has two naturally occurring isotopes with the following isotopic masses: 107 47 Ar 107 47 Ar 106.90509 108.9047 The average atomic mass of silver is 107.8682 amu. The fractional abundance of the lighter of the two isotopes is __________.
0.51835
Which formula/name pair is incorrect?
Mg3N2 magnesium nitrite
The charge on an electron was determined in the __________.
Millikan oil drop experiment
Which species below is the nitride ion?
N3-
Which species below is the nitrate ion?
NO3 -
Barium reacts with a polyatomic ion to form a compound with the general formula Ba3(X)2. What would be the most likely formula for the compound formed between sodium and the polyatomic ion X?
Na3X
Which pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties?
O, S
Of the following, __________ contains the greatest number of electrons.
P3-
Of the choices below, which one is not an ionic compound?
PCl5
Which one of the following is not true concerning cathode rays?
The characteristics of cathode rays depend on the material from which they are emitted.
Which pair of elements is most apt to form an ionic compound with each other
barium, bromine
The atomic mass unit is presently based on assigning an exact integral mass (in amu) to an isotope of __________.
carbon
An element that appears in the lower left corner of the periodic table is __________.
definitely a metal
Of the following, the smallest and lightest subatomic particle is the __________.
electron
Cathode rays are __________.
electrons
The nucleus of an atom does not contain __________.
electrons
A correct name for Fe(NO3)2 is __________.
ferrous nitrate
The suffix -ide is used primarily __________.
for monatomic anion names
Which one of the following basic forces is so small that it has no chemical significance?
gravity
A molecular formula always indicates __________.
how many of each atom are in a molecule
Elements __________ exhibit similar physical and chemical properties.
in the same group of the periodic table
An element in the upper right corner of the periodic table __________.
is definitely a non-metal
The gold foil experiment performed in Rutherford's lab __________.
led to the discovery of the atomic nucleus
The correct name for MgF2 is __________.
magnesium fluoride
Gravitational forces act between objects in proportion to their __________.
masses
Different isotopes of a particular element contain different numbers of __________.
neutrons
Which one of the following polyatomic ions has the same charge as the hydroxide ion?
nitrate
The proper formula for the hydronium ion is __________.
nitride
Which atom has the smallest number of neutrons?
nitrogen-14
The correct name for HNO2 is __________.
nitrous acid
In the symbol below, x = __________. x 6 C
not enough information to determine
All atoms of a given element have the same __________.
number of protons
In the periodic table, the elements are arranged in __________.
order of increasing atomic number
Which element forms an ion with the same charge as the ammonium ion?
potassium
Different isotopes of a particular element contain the same number of __________.
protons
The nucleus of an atom contains __________.
protons and neutrons
Isotopes are atoms that have the same number of __________ but differing number of __________.
protons, neutrons
Elements in the same group of the periodic table typically have __________.
similar physical and chemical properties
Which type of formula provides the most information about a compound?
structural
Formulas that show how atoms are attached in a molecule are called __________.
structural formulas
Which one of the following does not occur as diatomic molecules in elemental form?
sulfur
Which pair of elements is most apt to form an ionic compound with each other?
sulfur, fluorine
In the Rutherford nuclear-atom model, __________.
the heavy subatomic particles, protons and neutrons, reside in the nucleus
A molecule of water contains hydrogen and oxygen in a 1:8 ratio by mass. This is a statement of __________.
the law of constant composition
In the symbol below, x is __________. x 6 C
the mass number
An empirical formula always indicates __________.
the simplest whole-number ratio of different atoms in a compound
Cathode rays are deflected away from a negatively charged plate because __________.
they are negatively charged particles
In the absence of magnetic or electric fields, cathode rays __________.
travel in straight lines
Of the three types of radioactivity characterized by Rutherford, which are particles?
α-rays and β-rays
Of the three types of radioactivity characterized by Rutherford, which is/are electrically charged?
α-rays and β-rays
Of the three types of radioactivity characterized by Rutherford, which is/are not electrically charged?
γ-rays
Of the three types of radioactivity characterized by Rutherford, which is/are not particles?
γ-rays
Vanadium has two naturally occurring isotopes, 50V with an atomic mass of 49.9472 amu and 51V with an atomic mass of 50.9440. The atomic weight of vanadium is 50.9415. The percent abundances of the vanadium isotopes are __________% 50V and __________% 51V.
0.25, 99.75
The element X has two naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is __________ amu. Isotope Abundance (%) Mass (amu) 31X 35.16 31.16 34X 64.84 34.30
33.20
The species __________ contains 16 neutrons.
31P
Which species has 18 electrons?
32S-2
Which species has 48 electrons?
118 50 Sn+2
Which species has 54 electrons?
128 52 Te2
The element X has three naturally occurring isotopes. The isotopic masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is __________ amu. Isotope Abundance Mass 159X 30.60 159.37 163X 15.79 162.79 164X 53.61 163.92
162.35
The element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is __________ amu. Isotope Abundance (%) Mass (amu) 15X 28.60 15.33 17X 13.30 17.26 16X 58.10 18.11
17.20
Which one of the following species has as many electrons as it has neutrons?
19F-
The element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is __________ amu. Isotope Abundance Mass 221X 74.22 220.9 220X 12.78 220.0 218X 13.00 218.1
220.4
Which combination of protons, neutrons, and electrons is correct for the isotope of copper, 63 29 Cu?
29 p+, 34 n°, 29 e-
Which one of the following is the formula of hydrochloric acid?
HCl
Which formula/name pair is incorrect?
Fe2(SO4)3 iron(III) sulfide
The proper formula for the hydronium ion is __________.
H3O+
The molecular formula of a compound is always __________ the empirical formula.
an integral multiple of
Which atom has the largest number of neutrons?
argon-40
The elements in groups 1A, 6A, and 7A are called, __________, respectively.
alkali metals, chalcogens, and halogens