Chemistry Chp 1-2

A small amount of salt dissolved in water is an example of a __________.
Homogeneous mixture
Which one of the following is a pure substance?
elemental copper
For which of the following can the composition vary?
both homogeneous and heterogeneous mixtures
An element cannot __________.
be separated into other substances by chemical means
Homogeneous mixtures are also known as __________.
solution
In the following list, only __________ is not an example of a chemical reaction.
the condensation of water vapor
Of the following, only __________ is a chemical reaction.
tarnishing of silver
Which of the following are chemical processes?
rusting of a nail and decomposition of water into hydrogen and oxygen gases
In the following list, only __________ is not an example of a chemical reaction.
the tarnishing of a copper penny
Of the following, __________ is the smallest mass.
2.5 ? 10^9 fg
Of the following, __________ is the largest mass.
Accuracy refers to __________.
how close a measured number is to the true value
The SI unit for mass is __________.
kilogram
__________ is the abbreviation for the prefix mega-.
M
Milli is the abbreviation for the prefix ________.
m
A common English set of units for expressing velocity is miles/hour. The SI unit for velocity is __________.
m/s
The SI unit of temperature is __________.
K
1 nanometer = __________
1000 picometers
There are ______ electrons, ______ protons, and _______ neutrons in an atom of 132/54Xe.
54, 54, 78
An atom of the most common isotope of gold, 197Au, has __________ protons, __________ neutrons, and __________ electrons.
79, 118, 79
Isotopes are atoms that have the same number of __________ but differing number of __________.
protons, neutrons
Different isotopes of a particular element contain the same number of __________.
protons
Different isotopes of a particular element contain different numbers of __________.
neutrons
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
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 pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties?
Ca, Sr
Which pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties?
O, S
Which one of the following does not occur as diatomic molecules in elemental form?
sulfur
Which one of the following molecular formulas is also an empirical formula?
C2H6SO
Of the choices below, which one is not an ionic compound?
PCl5
Which one of the following is most likely to lose electrons when forming an ion?
Rh
Which species is an isotope of 39Cl?
36Cl-
There are __________ protons, __________ neutrons, and __________ electrons in 131I-.
53, 78, and 54
Which pair of elements is most apt to form a molecular compound with each other?
sulfur, fluorine
Which species below is the nitride ion?
N3-
Which species below is the sulfite ion?
S O3-2
The charge on the copper ion in the salt CuO is __________.
+2
Horizontal rows of the periodic table are known as __________.
periods
Elements in Group 7A are known as the __________.
halogens
When a metal and a nonmetal react, the __________ tends to lose electrons and the __________ tends to gain electrons.
metal, nonmetal
The charge on the manganese in the salt MnF3 is
+3
Potassium forms an ion with a charge of __________.
+1
Aluminum forms an ion with a charge of __________.
+3
Fluorine forms an ion with a charge of __________.
-1
The ions Ca2+and PO43- form a salt with the formula __________.
Ca3 (PO4)2
How many electrons does the Al3+ ion possess?
10
How many protons does the Br- ion possess?
35