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Chemistry Midterm Review Part II Flashcards | StudBud
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Chemistry Midterm Review Part II
Chemistry Midterm Review Part II
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1
What is the temperature of -34 C expressed in Kelvins?
339 K
207 K
239 K
139 K
2
Which of the following is NOT a noble gas?
copper (29)
helium (2)
argon (18)
neon (10)
3
Which of the following groupings contain only representative elements?
Cu, (29) Co, (27) Cd (48)
Ni, (28) Fe, (26) Zn (30)
Hg, (80) Cr,(24) Ag (47)
Al,(13) Mg, (12) Li (3)
4
A negative ion is known as a(n)
cation
valence electrons
ionic radius
anion
5
How many protons, electrons and neutrons does an atom w/atomic # 50 and mass # 125 contain?
50, 50, 75
50, 75, 120
75, 50, 70
50, 75, 50
6
The shape of CF
4
is
trigonal planar
bent
trigonal pyramid
tetrahedral
7
A molecule with a triple bond is
I2
Cl2
N2
SO2
8
When group 2A elements form ions, they
gain two protons
lose 2 electrons
lose two protons
gain two electrons
9
The least electronegative element listed below is
aluminum (13)
fluorine (9)
nickel (28)
calcium (20)
10
What is the number of grams in 0.5 kg?
5000 g
0.005 g
500 g
0.0005 g
11
How many unpaired electrons are in a sulfur (16) atom?
3
0
1
2
12
When multiplying, the # of sig figs in the answer should equal
the least precise measurement
all of the measurements
the least and most precise measurements
the most precise measurement
13
According to VSEPR theory, molecules adjust their shape to keep what as far apart as possible?
the electrons closest to the nuclei
pairs of valence electrons
inner shell electrons
mobile electrons
14
The attraction of valence electrons for metal ions is called
metallic bond
octet rule
valence electron
ionic bond
15
The modern PT is organized by
decreasing atomic numbert
increasing atomic charge
increasing atomic mass
increasing atomic number
16
Which of the following statements is NOT true?
the nucleus of an atom is positively charged
neutrons are located in the nucleus of an atom
electrons are negatively charged and have a mass of 1 amu
protons have a positive charge
17
Bond energy is the
energy released when a bond breaks
energy required to break chemical bonds
energy required to form a chemical bond
energy absorbed when a chemical bond forms
18
How many orbitals are in the p sublevel?
5
3
1
6
19
Which explains the size of ions correctly?
anions and cations are larger than their neutral atoms
anions and cations are smaller than their neutral atoms
cations are larger than their neutral atoms
anions are larger than their neutral atoms
20
How many electrons are shared in a double bond?
6
4
1
2
21
Which of the following shows the correct steps of the scientific method?
theory-experiment-observe
hypothesize-observe-experiment
observe-hypothesize-experiment
observe-theory-experiment
22
Which of the following occurs in an ionic bond?
two atoms share more than two electrons
oppositely charged ions attract
two atoms share electrons
like charged ions attract
23
Aufbrau principle says
electrons enter orbitals of lowest energy first
an orbital may only hold 2 electrons
electrons enter orbitals of highest energy first
electrons in the same orbital have opposite spin
24
The tendency for an atom to attract electrons to itself when forming bonds is called
electronegativity
electron affinity
electron configuration
ionization energty
25
Which of the following measurements is expressed to 3 sig figs?
0.070
7077
0.007
7.30x10-7
26
A ___ is a neutral group of atoms held together by covalent bonds
ionic compound
metal
molecule
compound
27
What type of ions end in -ide ?
anions only
cations only
metals only
gaseous ions only
28
Noble gases have an electron configuration that
has partially filled s and p orbitals
electrons in the d orbitals
completely filled s and p orbitals
completely filled s orbitals
29
Which variable is directly proportional to energy?
wavelength
position
frequency
velocity
30
___ is composed of 2 or more substances chemically combined in a fixed proportion?
element
heterogeneous mixture
compound
mixture
