chem 121 exam 1
d
The elements in Group 2A are known by what name? d. alkaline earth metals
c
The elements in a column of the periodic table are know as: c. a group
a
Which element would be expected to have properties similar to calcium? a. Ba
d
Which of the following is a metalloid? d. germanium, Ge, Z=32
c
Which of the following is an example of an observation? c. paraffin wax begins to melt at 57 degrees celsius.
B
Which of these pairs of elements would be most likely to form an ionic compound? b. Cl and Mg
a
Which of these scientists developed the nuclear model of the atom? a. ernest rutherford
b
atom of the same element with different mass numbers are called: b. isotopes
b
calculate the atomic mass of silicon: b. 28.0855
c
consider the element with the electron configuration [Kr] 5s24d7. this element is c. a transition metal
c
determine the charge on the unknown ion, A, in the compound ACl2 c. +2
a
determine the formula of the compound formed from Al3+ and S2- a. Al2S3
d
determine which sub level designated is not legitimate. d. 1p
c
each of the noble gases has a completely filled p subshell except for which one? c. helium
b
how does atomic radius change as you move across the periodic table? b. atomic radius decreases moving from left to right across a period and increases from top to bottom
a
how many significant figures are in 0.006570? a. 4
e
how many valence electrons does a tin (Sn) atom have? e. 4
d
select the answer that expresses the result of this calculation with the correct number of significant figures: 13.602x1.90x3.06/4.2x1.4097 d. 13
a
select the answer with the correct number of decimal places for the following sum: 13.914cm+243.1cm+12.00460cm= a. 269.0cm
d
select the arrangement of electromagnetic radiation which starts the lowest energy and increases to the greatest energy. d. radio, infrared, ultraviolet, gamma rays
c
select the element that will lose an electron most easily, based on the periodic table: c. K
e
the general electron configuration for atoms of all elements in Group 5A is e. ns2np3
b
the number of orbitals in a d subshell is: b. 5
e
two isotopes of an element differ only in their: e. atomic mass
b
what element is represented by X in the atomic symbol notation 195 X 78? b. platinum
c
what types of elements undergo covalent bonding? c. two nonmetals
b
which is correct if 15,390,000 is rounded to two significant figures b. 15,000,000
e
which of the following characteristics do all of these kinds of radiation share? e. they are all the transmission of energy in the form of waves
a
which of the following electron transitions would be expected to emit any light in the bohr model of the atom? a. n=4 to n=3
a
which of the following elements exists as a diatomic molecule in the elemental state? a. O
e
which of the following elements has the largest number of unpaired electrons in the ground state? e. V
c
which of the following is the empirical formula for hexane, C6H14? c. C3H7
b
which of the following isotopes of the same element? b. I&III
c
which of the following represents the greatest mass? c. 1.5x10^9cg
a
which of these atoms has the smallest radius? a. P
b
which of these compounds is most likely to be ionic? b. KF
c
which of these is an example of a physical property? c. lead becomes a liquid when heated to 601 degrees
d
which of these species make an isoelectronic pair: d. Cl- and Ca2+
b
write the value 0.000000000143 in scientific notation b. 1.43x10^-10
