Transcript gas balloon

Test bank
Chapter 5,7,8,9
‫ ليلى الحربي‬.‫إعداد د‬
Dr.Laila Al-Harbi
Which is correct?
1. All gases are fluids.
2. All gases are diatomic.
a. Both statements are true.
b. Both statements are false.
c. Statement 1 is true, but statement 2 is
false.
d. Statement 1 is false, but statement 2 is
true.
Dr.Laila Al-Harbi
As a helium-filled balloon rises, its
volume increases. This is an
example of:
a.
b.
c.
d.
Avogadro’s Law.
Boyle’s Law.
Charles’ Law.
Gay-Lussac’s Law.
Dr.Laila Al-Harbi
Hot air balloons rise. This is an
example of:
a.
b.
c.
d.
Avogadro’s Law.
Boyle’s Law.
Charles’ Law.
Gay-Lussac’s Law.
Dr.Laila Al-Harbi
Avogadro’s Law states that the
volume of a gas is directly
proportional to:
a.
b.
c.
d.
the number of gas particles.
the mass of the gas.
the pressure of the gas.
the Kelvin temperature of the gas.
Dr.Laila Al-Harbi
Standard temperature and pressure
(STP) for a gas is:
a.
b.
c.
d.
0 atmospheres and 25 degrees C.
1 atmosphere and 0 degrees C. (273 K)
1 atmosphere and 25 degrees C.
0 atmospheres and 0 degrees C.
Dr.Laila Al-Harbi
The partial pressure of each gas in
a mixture is proportional to:
a. the mass of the gas.
b. the molecular weight of the gas.
c. the square root of the molecular weight
of the gas.
d. the mole fraction of the gas.
Dr.Laila Al-Harbi
4. Under conditions of fixed temperature and
amount of gas, Boyle's law requires that
I. P1V1 = P2V2
II. PV = constant
III. P1/P2 = V2/V1
(a) I only
(b) II only
(c) III only
(d) I, II, and III
(e) another combination
Dr.Laila Al-Harbi
A sample of two moles of nitrogen
gas (N2) will occupy what volume at
STP? PV=nRT = 2x0.082x273/1=
a.
b.
c.
d.
11.2 liters
22.4 liters
44.8 liters
89.6 liters
Dr.Laila Al-Harbi
• A sample of hydrogen gas was collected over
water at 21C and 0.9 atm. The volume of the
container was 7.80 L. Calculate the mass of
H2(g) collected. (Vapor pressure of water =
0.025 atm at 21C.)
• (A) 0.283 g
• (B) 435 g
• (C) 0.571 g
• (D) 7.14 g
Dr.Laila Al-Harbi
If 250 mL of NO is placed in a flask with O2, what volume of O2 is
needed for complete reaction?
2 NO (g) + O2 (g)
2 NO2 (g)
From the equation because all reactant are gases 250 x1 /2 = 125
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•
•
•
•
100 mL
125 mL
200 mL
250 mL
Cannot be determined from the given
information.
Dr.Laila Al-Harbi
If an equal mass of each gas is put into a separate balloon, which
will have the greatest volume?
Assume that they are all the same temperature
and pressure.
•
•
•
•
•
He (ℳ =2)
H2 (ℳ =1)
N2 (ℳ =28)
Ne (ℳ =20)
O2 (ℳ =32)
Assume that they are all the same temperature and pressure.
PV =(m/ℳ ) RT → V ⋉ 1/ ℳ Sine all other variables are
constants
Dr.Laila Al-Harbi
If equal masses of CH4, C2H6, and C3H8 are placed
in a flask, which of the following is true?
•
•
•
•
•
PCH4 = PC2H6 = PC3H8
PCH4 ~ PC2H6 ~ PC3H8
PCH4 > PC2H6 > PC3H8
PCH4 < PC2H6< PC3H8
None of the above
PV =(m/ℳ ) RT
Dr.Laila Al-Harbi
Chapter 7
Dr.Laila Al-Harbi
The wavelength of electromagnetic
energy multiplied by its frequency
equals: ν = c/λ → ν λ=c
a.
b.
c.
d.
c, the speed of light
h, Planck’s constant
Avogadro’s number
4.184
Dr.Laila Al-Harbi
The energy of a photon of
electromagnetic energy divided by
its frequency equals:
E =hν → E/ν = h
a.
b.
c.
d.
c, the speed of light
h, Planck’s constant
Avogadro’s number
4.184
Dr.Laila Al-Harbi
Light that contains colors of all
wavelengths is called:
a.
b.
c.
d.
a continuous spectrum.
monochromatic.
a line spectrum.
a Balmer series.
Dr.Laila Al-Harbi
The lowest energy state of an atom
is referred to as its:
a.
b.
c.
d.
bottom state.
ground state.
fundamental state.
original state.
Dr.Laila Al-Harbi
All s orbitals are:
a.
b.
c.
d.
shaped like four-leaf clovers.
dumbbell-shaped.
spherical.
triangular.
Dr.Laila Al-Harbi
The way electrons are distributed
among the various orbitals of an
atom is referred to as the atom’s:
a.
b.
c.
d.
orbital diagram.
electron configuration.
electron distribution.
electron spread.
Dr.Laila Al-Harbi
[He]2s22p2 is the electron
configuration of which element?
a.
b.
c.
d.
beryllium
boron
carbon
nitrogen
Dr.Laila Al-Harbi
Considering only the n = 1 to n = 5 states in the
hydrogen atom, which transition will emit the
longest wavelength?
•
•
•
•
•
n = 5 to n = 4
n = 5 to n = 2
n = 3 to n = 1
n = 3 to n = 2
n = 4 to n = 2
E =hν → E & h are directly proportional
E =hc/λ → E & λ are inversely proportional
Dr.Laila Al-Harbi
What are the valence electrons of
vanadium (V)?
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•
•
•
•
4s2
3d3
4s23d3
3d5
4d5
Dr.Laila Al-Harbi
What are the valence electrons of
gallium Ga?
•
•
•
•
•
4s2
4p1
4s23d104p1
4s23d10
4s24p1
Dr.Laila Al-Harbi
What is the maximum number of orbitals
described by the quantum numbers:
•
•
•
•
•
1
3
5
8
9
n=3 l=2
the maximum number of orbitals
= 2ℓ+1=2x2+1=5
Dr.Laila Al-Harbi
What is the maximum number of electrons
described by the quantum numbers:
•
•
•
•
•
7
14
16
32
48
n=4
the maximum number of electrons = 2n2 =2(4) 2 =32
Dr.Laila Al-Harbi
How many unpaired electrons does
selenium Se have?
•
•
•
•
•
4s24p4
0
2
4
6
8
Dr.Laila Al-Harbi
How many unpaired electrons does
chromium have?
•
•
•
•
•
0
2
4
6
8
4s13d5
Dr.Laila Al-Harbi
The electron configuration of a neutral atom is [Ne] 3s2
3p1. The four quantum numbers of the last electron are:
(A) (2, 1, -1, +1/2)
(B) (3, 3, -1 , +1/2)
(C) (3, 0, -1, +1/2)
(D) (3, 1, -1, +1/2 )#
Dr.Laila Al-Harbi
Chapter 8
Dr.Laila Al-Harbi
- Selenium (34Se) element is:
(a) a nonmetal
(b) found in group 6A
(c) both a and b
Dr.Laila Al-Harbi
• The outer electron configuration of the noble
gases is
(a) ns2 np6
(b) ns2 nd10
(c) ns2 np4
• Which of the following species is isoelectronic
with Cl(a) F(b) O2(c) K+
(d) Na+
Dr.Laila Al-Harbi
-Which of the following sets of elements is
expected to have similar chemical properties?
a) Sulfur and phosphorous
b) Sulfur and oxygen
c) Sulfur and argon
Dr.Laila Al-Harbi
Gallium (Ga) element is found in the periodic table in
(a) period 3, group 1B
(b) period 3A, group 4
(c) period 4, group 1A
(d) period 4, group 3A
Dr.Laila Al-Harbi
Titanium (Ti) element is found in the
periodic table in
(a)
(b)
(c)
(d)
s-block
P-block
d-block
f-block
Dr.Laila Al-Harbi
Choose the incorrect quantum numbers for
electron in an atom.
A) (3, 0, 0, +1/2).
(B) (4, 3, –2, +1/2).
(C) (1, 0, -1, -1/2). Correct (1,0,0,-1/2)
(D) (3, 2, 0, +1/2)
(
Dr.Laila Al-Harbi
• Write the electronic configuration for Co2+
(a) [Ar] 4s2 3d5
(b) [Ar] 3d7
(c) [Ar] 4s1 3d6
Select the correct order of radius of the two
ions
(A) A+ > A(B) A- < A
(C) A2+ > A+
(D) A2+ < A+

Dr.Laila Al-Harbi
Which choice below correctly lists
the elements in order of increasing
atomic radii?
a.
b.
c.
d.
Na < Mg < K < Rb
Mg < Na < K < Rb
Rb < K < Na < Mg
Rb < K < Mg < Na
Dr.Laila Al-Harbi
Two ions are referred to as
isoelectronic if they have the same
number of:
a.
b.
c.
d.
electrons.
protons.
atoms.
neutrons.
Dr.Laila Al-Harbi
Which statement is false?
a. Fluoride ions are larger than
rubidium ions.
b. Bromide ions are larger than
sodium ions.
c. Iodide ions are larger than rubidium
ions.
d. Chloride ions are larger than
potassium ions.
Dr.Laila Al-Harbi
The energy required to remove an
electron from an atom in its
ground state is known as the:
a.
b.
c.
d.
potential energy.
activation energy.
electron affinity.
ionization energy.
Dr.Laila Al-Harbi
Which choice correctly lists the
elements in order of increasing
electron affinity (most negative to
least negative)?
a.
b.
c.
d.
O, Cl, B, C
O, Cl, C, B
Cl, O, C, B
Cl, O, B, C
Dr.Laila Al-Harbi
Which choice correctly lists the
elements in order of increasing
first ionization energy?
a.
b.
c.
d.
Na < Ca < Al < Sn
Na < Al < Ca < Sn
Na < Al < Sn < Ca
Ca < Na < Sn < Al
Dr.Laila Al-Harbi
An unknown solid gives a green
flame test. When it was dissolved
in water and reacted with NaOCl, a
purple color appeared. The
unknown is:
a.
b.
c.
d.
barium bromide.
calcium iodide.
barium iodide.
calcium bromide.
Dr.Laila Al-Harbi
Characteristics of noble gases
include:
a.
b.
c.
d.
filled s and p subshells.
monatomic gases.
generally unreactive chemically.
all of the above.
Dr.Laila Al-Harbi
In an germanium atom, which electron
will experience the greatest effective
nuclear charge? An electron in a
1.
2.
3.
4.
5.
2s orbital.
2p orbital.
3s orbital.
3p orbital.
3d orbital.
Dr.Laila Al-Harbi
Order the following according to
increasing atomic/ionic radius.
1.
2.
•
•
•
N3– Li+ C O2–
C < Li+ < O2– < N3–
N3– < O2– < C < Li+
Li+ < C < N3– < O2–
Li+ < C < N3– < O2–
Li+ < C < O2– < N3–
Dr.Laila Al-Harbi
Which will have the highest
ionization energy?
•
•
•
•
•
C
N
O
Al
Si
Dr.Laila Al-Harbi
Which will be the largest?
I = ionization energy
•
•
•
•
•
I1 of Na
I2 of Na
I1 of Mg
I2 of Mg
I3 of Mg
Dr.Laila Al-Harbi
Chapter 9
Dr.Laila Al-Harbi
The two types of chemical bonds
commonly found in compounds
are:
a.
b.
c.
d.
doric and covalent.
ionic and electrolytic.
ionic and covalent.
electrolytic and compound.
Dr.Laila Al-Harbi
The electrons used by atoms to
form chemical bonds are the:
a.
b.
c.
d.
core electrons.
valence electrons.
lone pair electrons.
unpaired electrons.
Dr.Laila Al-Harbi
“Atoms tend to gain, lose, or share
electrons until they are surrounded
by eight valence electrons” is a
statement of:
a.
b.
c.
d.
the rule of octaves.
the double quartet rule.
the eight electron rule.
the octet rule.
Dr.Laila Al-Harbi
When a transition metal atom
becomes a +1 ion, the electron lost
usually comes from what type of
orbital?
a.
b.
c.
d.
p
f
d
s
Dr.Laila Al-Harbi
A molecule of CS2 contains:
a.
b.
c.
d.
two single bonds.
two double bonds.
one single bond and one double bond.
one single bond and one triple bond.
Dr.Laila Al-Harbi
• An atom in the ground state has atomic
number Z=5. Choose the correct electron-dot
structure which represents this atom?
(A)
X
(B)
X
(C)
X
(D)
X
Dr.Laila Al-Harbi
What is the formal charge on the
nitrogen atom in the nitrate ion
(NO3–1) ?
a.
b.
c.
d.
+2
+1
0
–1
Dr.Laila Al-Harbi
Which compound below contains
an atom that is surrounded by
more than an octet of electrons?
a.
b.
c.
d.
PF5
CH4
NBr3
OF2
Dr.Laila Al-Harbi
Which choice below correctly lists
the elements in order of increasing
electronegativity?
a.
b.
c.
d.
C<N<O<F
N<C<O<F
N<C<F<O
C<N<F<O
Dr.Laila Al-Harbi
As the number of bonds between
two atoms increases, the distance
between the atoms:
a.
b.
c.
d.
increases.
decreases.
remains unchanged.
varies with the atoms involved.
Dr.Laila Al-Harbi
Which atom sometimes violates the
octet rule?
1.C
2.N
3.O
4.F
5.S
Dr.Laila Al-Harbi
Order the following according to
increasing atomic radius.
Ge Si Se Cl
1.
2.
3.
4.
5.
Ge < Si < Se < Cl
Se < Si < Ge < Cl
Si < Cl < Ge < Se
Cl < Si < Se < Ge
Si < Ge < Se < Cl
Dr.Laila Al-Harbi
What is the electronic configuration
of Fe2+?
1.
2.
3.
4.
5.
4s23d4
4s13d5
3d5
3d6
4s23d8
Dr.Laila Al-Harbi
How many unpaired electrons are
there in Cu+?
1.
2.
3.
4.
5.
0
1
2
3
4
Dr.Laila Al-Harbi
How many resonance structures can
be drawn for NO3–?
1.1
2.2
3.3
4.4
5.5
Dr.Laila Al-Harbi
•An atom in the ground state has atomic number Z=5. Choose the correct electron-dot structure which represents this atom?
Considering formal charge, what is the preferred Lewis
structure of NCO–?
Dr.Laila Al-Harbi
: :
: _ _
: :
• In Lewis structure of (SO4)-2structure the
correct formal charge on sulfur (S) is:
a) +2
b) -2
:O: +2
c) +1
6
4
_
d) 0
-
:
:O:
Dr.Laila Al-Harbi
+2