A 9.0 g sample of solid sodium bicarbonate completely decomposes into solid sodium hydroxide and carbon dioxide gas when heated. After the sodium hydroxide cools it has a mass of 4.74 g. According to the Law of Conservation of Mass, what mass of carbon dioxide must have been formed?
a) 4.67 g
b) 4.26 g
c) 4.3 g
d) 13.7 g
e) none of the above
A substance that can only be separated by chemical means is:
an element
a compound
either a compound or an element
a homogenous mixture
a heterogeneous mixture
Which of the following statement(s) is(are) not correct?
a) The conversion of compounds into elements is a chemical change.
b) The conversion of sugar into carbon and water is a chemical change.
c) The conversion of liquid water into gaseous water is a chemical change.
d) The conversion of elements into compounds is a chemical change.
e) The evaporation of water is a physical change.
f) d and e
Which of the following is a mixture?
a) sucrose (C12H22O11)
b) solder (an alloy made of varying amounts of Sn and Pb)
c) the diatomic gas bromine (Br2)
d) both a and b
e) both b and c
If the distance between layers of silicon atoms in graphite is given as 823 pm, what is the distance in cm?
8.23 x 10^-10
8.23 x 10^-12
8.23 x 10^-7
8.23 x 10^-8
8.23 x 10^-6
A 0.75 kg sample of methylene chloride has a density of 1.32 x 10^3 mg/cm^3. What is the volume in L of methylene chloride?
0.99 L
5.7 L
5.68 x 10^-1 L
5.7 x 10^-1
0.5682 L
The British physicist who won the Nobel Peace prize in 1906 for the discovery of the electron was:
Ernest Rutherford
JJ Thomson
Robert Millikan
James Chadwick
Which statement is not true of the nucleus of an atom?
a) it contains the neutrons, protons and electrons
b) it is at the center of an atom
c) its overall charge is positive
d) it contains most of the mass of an atom
e) both a and d
The number of protons in a neutral atom of a given element is equal to:
a) the mass number
b) the nuclear number
c) the atomic number
d) the number of electrons
f) both c and d
How many protons, neutrons and electrons are in the isotope of Ni+2 having a mass number of 57?
28p, 29n, 30e-
57p, 29n, 28e-
28p, 29n, 26e-
28p, 57n, 26e-
The formulas of the phosphate ion, the ammonium ion and the perchlorate ion are represented by:
PO4-3, NH4+, ClO3-
PO3-2, NH3+, ClO2-
PO4-3, NH4+, ClO4-
PO4-2, NH4+, ClO4-
The formula for potassium sulfide is:
KS
KS2
K2SO4
K2S
How many atoms of Ca are there in 2.11 g of Ca?
3.11 x 10^+22
8.75 x 10^-26
1.27 x 10^+24
3.11 x 10^+23
Which of the following statements is true for acetic acid, C2H4O2?
2 mole C2H4O2 contains 2 moles C
3 mole C2H4O2 contains 8 moles H
5 mole C2H4O2 contains 10 moles O
1 mole C2H4O2 contains 1 moles C
How many grams of oxygen are there in 25 g of Al2O3?
1.17 x 10^1 g
12 g
3.9 g
1.2 x 10^25 g
What is the mass percentage of Cl in 1 mole C14H9Cl5?
50.02%
47.42%
10.01%
75.09%
What is the percent yield of Cu in an experiment if the actual yield is 12.01 g and the theoretical yield is 14.15 g?
117.8%
84.87%
2.14%
71.09%
A soluble molecular compound has the ability to conduct electricity.
Which of the following is(are) example(s) of a weak electrolyte?
a) HCl
b) NH3
c) KOH
d) HCN
e) b and c
f) b and d
When AgNO3 reacts with HCl the products are:
a) H2 (g)
b) nitric acid
c) AgCl (s)
d) AgCl (aq)
What is the net ionic equation when HC2H3O2 reacts with NaOH?
HC2H3O2(aq) + NaOH(aq) -> C2H3O2Na(aq) + H2O(l)
H+(aq) + OH-(aq) -> H2O(l)
HC2H3O2(aq) + 2OH-(aq) -> C2H3O2-(aq) + 2 H2O(l)
HC2H3O2(aq) + OH-(aq) -> C2H3O2-(aq) + H2O(l)
A Bronsted-Lowry acid/base reaction is best defined as:
a combination reaction
a redox reaction
a loss of a proton
a proton transfer reaction
A diprotic acid has ___ acidic protons.
many
2
3
4
d
The gas formed when Na2S reacts with H2SO4 is:
SO3
SO2
H2S
Cl2
What are the oxidation sates of each element in KClO2?
K=+1, Cl=+5, O=-2
K=-1, Cl=+5, O=-2
K=+1, Cl=-5, O=-2
K=+1, Cl=+5, O=+2
CuCl2(aq) + Mg(s) -> MgCl2(aq) + Cu(s) is an example of a:
a) combination reaction
b) combustion reaction
c) displacement reaction
d) redox reaction
e) b and d
f) c and d
The kinetic energy of a 151 lb person with a velocity of 2.0 m/s is: (given 1lb=0.4536kg)
a) 1.4 x 10^2 J
b) 1.4 x 10^-2 kgm^2/s^2
c) 1.4 x 10^-2 J
d) 1.4 x 10^2 kgm^2/s^2
e) a and d
f) b and c
Calculate the quantity of heat required (q) to raise the temperature of a 0.103 g sample of Cu by 10.0°C given a specific heat of 0.384 J/g°C.
0.0396 J
03.84 J
0.3955 J
0.396 x 10^3 kJ
0.396 J
Internal energy, U is best defined as:
the sum of the kinetic and potential energies of all particles making up a substance
the total sum of all energies contained within a system
positional energy
the energy contained within the nucleus of an atom
What is true of the relationship between the energy, the frequency and the wavelength of light:
as energy increases, frequency decreases and wavelength decreases
as energy decreases, frequency decreases and wavelength decreases
as energy increases, frequency increases and wavelength decreases
When an electron transitions from the n=1 to the n=4 energy level light is emitted.
Which transition below best describes the absorption of the longest possible wavelength of light?
n=1 to n=6
n=2 to n=1
n=7 to n=8
n=8 to n=7
The value of the principal quantum number is referring to:
the shape of an atom
the energy level of an electron
the number of electrons in an atom
the size of the electron
An electron having n=3 and a l=2 must be in the:
3p subshell
3d subshell
3s subshell
3f subshell
A 2p subshell contains how many orbitals?
1
5
When l=4, n must have a minimum value of :
6
According to the energy order building up principle which statement(s) below is never correct.
a) 3p fills after 3s
b) 4s fills before 3d
c) 2s fills after 1s
d) 5s fills before 4p
Choose the correct statement below in terms of atomic size.
Te<Ag<Ru<Rb<Cs
Ru<Ag<Te<Rb<Cs
Cs<Ag<Te<Rb<Cs
Cs<Rb<Ru<Ag<Te
Ionization energy refers to the amount of energy required to add an electron to the valence shell of a gasoline atom.
Which species would you expect to have the greatest ionization energy associated with it?
Al+2
Al+1
Al
Al+3
How many electrons are shared when the ionic compound MgS2 is formed?
0
Which of the following is correct in terms of ionic radii:
Te-2<At-1<Cl-<S-2<P-3
S-2<Cl-<At-1<P-3<Te-2
Cl-<S-2<P-3<Te-2<At-1
P-3<Te-2<At-1<Cl-<S-2
Which of the following would you expect to have the highest melting point?
BaS
LiCl
Al2O3
MgCl2
Which noble gas is Ca+2 isoelectronic with?
Ne
Ar
Kr
Xe
Which is the most electronegative atom?
Cl
H
O
F
Which atoms are most likely to form triple bonds?
C, N, O and Cl
C and P
C and O
C, N and S
Which bond is most polar?
HCl
HBr
HO
HI
How many resonance Lewis electron dot structures does O3 have?
Which bond would require the most energy to break?
H-C
C=C
C≡C
C-C
The molecule CO2 is a polar molecule.
Which of the following describes the bond angles if a central atom has 5 groups around it?
90° and 180°
90°, 120° and 180°
120°
90°
What is the name of the molecular geometry about the central atom in PCl3?
trigonal pyramidal
tetrahedral
bent
distorted tetrahedron
Which of the following is a nonpolar molecule?
KrF2
AsF3
SF2
CH3F
What is the hybridization about the Xe atom in XeF4?
sp3
sp
sp3d
sp3d2
Which statement below is most accurate with regard to the total number of σ and π bonds in HCOCH3?
5 σ and 2 π bonds
7 σ bonds
6 σ and 1 π bonds
1 π bond
