1785228
Pregunta 1
Pregunta
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?
Respuesta
-
a) 4.67 g
-
b) 4.26 g
-
c) 4.3 g
-
d) 13.7 g
-
e) none of the above
Pregunta 2
Pregunta
A substance that can only be separated by chemical means is:
Respuesta
-
an element
-
a compound
-
either a compound or an element
-
a homogenous mixture
-
a heterogeneous mixture
Pregunta 3
Pregunta
Which of the following statement(s) is(are) not correct?
Respuesta
-
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
Pregunta 4
Pregunta
Which of the following is a mixture?
Respuesta
-
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
Pregunta 5
Pregunta
If the distance between layers of silicon atoms in graphite is given as 823 pm, what is the distance in cm?
Respuesta
-
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
Pregunta 6
Pregunta
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?
Respuesta
-
0.99 L
-
5.7 L
-
5.68 x 10^-1 L
-
5.7 x 10^-1
-
0.5682 L
Pregunta 7
Pregunta
The British physicist who won the Nobel Peace prize in 1906 for the discovery of the electron was:
Respuesta
-
Ernest Rutherford
-
JJ Thomson
-
Robert Millikan
-
James Chadwick
Pregunta 8
Pregunta
Which statement is not true of the nucleus of an atom?
Respuesta
-
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
Pregunta 9
Pregunta
The number of protons in a neutral atom of a given element is equal to:
Respuesta
-
a) the mass number
-
b) the nuclear number
-
c) the atomic number
-
d) the number of electrons
-
e) both b and c
-
f) both c and d
Pregunta 10
Pregunta
How many protons, neutrons and electrons are in the isotope of Ni+2 having a mass number of 57?
Respuesta
-
28p, 29n, 30e-
-
57p, 29n, 28e-
-
28p, 29n, 26e-
-
28p, 57n, 26e-
Pregunta 11
Pregunta
The formulas of the phosphate ion, the ammonium ion and the perchlorate ion are represented by:
Respuesta
-
PO4-3, NH4+, ClO3-
-
PO3-2, NH3+, ClO2-
-
PO4-3, NH4+, ClO4-
-
PO4-2, NH4+, ClO4-
Pregunta 12
Pregunta
The formula for potassium sulfide is:
Respuesta
-
KS
-
KS2
-
K2SO4
-
K2S
Pregunta 13
Pregunta
How many atoms of Ca are there in 2.11 g of Ca?
Respuesta
-
3.11 x 10^+22
-
8.75 x 10^-26
-
1.27 x 10^+24
-
3.11 x 10^+23
Pregunta 14
Pregunta
Which of the following statements is true for acetic acid, C2H4O2?
Respuesta
-
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
Pregunta 15
Pregunta
How many grams of oxygen are there in 25 g of Al2O3?
Respuesta
-
1.17 x 10^1 g
-
12 g
-
3.9 g
-
1.2 x 10^25 g
Pregunta 16
Pregunta
What is the mass percentage of Cl in 1 mole C14H9Cl5?
Respuesta
-
50.02%
-
47.42%
-
10.01%
-
75.09%
Pregunta 17
Pregunta
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?
Respuesta
-
117.8%
-
84.87%
-
2.14%
-
71.09%
Pregunta 18
Pregunta
A soluble molecular compound has the ability to conduct electricity.
Respuesta
- True
- False
Pregunta 19
Pregunta
Which of the following is(are) example(s) of a weak electrolyte?
Respuesta
-
a) HCl
-
b) NH3
-
c) KOH
-
d) HCN
-
e) b and c
-
f) b and d
Pregunta 20
Pregunta
When AgNO3 reacts with HCl the products are:
Respuesta
-
a) H2 (g)
-
b) nitric acid
-
c) AgCl (s)
-
d) AgCl (aq)
-
e) b and c
-
f) b and d
Pregunta 21
Pregunta
What is the net ionic equation when HC2H3O2 reacts with NaOH?
Respuesta
-
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)
Pregunta 22
Pregunta
A Bronsted-Lowry acid/base reaction is best defined as:
Respuesta
-
a combination reaction
-
a redox reaction
-
a loss of a proton
-
a proton transfer reaction
Pregunta 23
Pregunta
A diprotic acid has ___ acidic protons.
Respuesta
-
many
-
2
-
3
-
4
-
d
Pregunta 24
Pregunta
The gas formed when Na2S reacts with H2SO4 is:
Respuesta
-
SO3
-
SO2
-
H2S
-
Cl2
Pregunta 25
Pregunta
What are the oxidation sates of each element in KClO2?
Respuesta
-
K=+1, Cl=+5, O=-2
-
K=-1, Cl=+5, O=-2
-
K=+1, Cl=-5, O=-2
-
K=+1, Cl=+5, O=+2
Pregunta 26
Pregunta
CuCl2(aq) + Mg(s) -> MgCl2(aq) + Cu(s) is an example of a:
Respuesta
-
a) combination reaction
-
b) combustion reaction
-
c) displacement reaction
-
d) redox reaction
-
e) b and d
-
f) c and d
Pregunta 27
Pregunta
The kinetic energy of a 151 lb person with a velocity of 2.0 m/s is: (given 1lb=0.4536kg)
Respuesta
-
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
Pregunta 28
Pregunta
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.
Respuesta
-
0.0396 J
-
03.84 J
-
0.3955 J
-
0.396 x 10^3 kJ
-
0.396 J
Pregunta 29
Pregunta
Internal energy, U is best defined as:
Respuesta
-
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
Pregunta 30
Pregunta
What is true of the relationship between the energy, the frequency and the wavelength of light:
Respuesta
-
as energy increases, frequency decreases and wavelength decreases
-
as energy decreases, frequency decreases and wavelength decreases
-
as energy increases, frequency increases and wavelength decreases
Pregunta 31
Pregunta
When an electron transitions from the n=1 to the n=4 energy level light is emitted.
Respuesta
- True
- False
Pregunta 32
Pregunta
Which transition below best describes the absorption of the longest possible wavelength of light?
Respuesta
-
n=1 to n=6
-
n=2 to n=1
-
n=7 to n=8
-
n=8 to n=7
Pregunta 33
Pregunta
The value of the principal quantum number is referring to:
Respuesta
-
the shape of an atom
-
the energy level of an electron
-
the number of electrons in an atom
-
the size of the electron
Pregunta 34
Pregunta
An electron having n=3 and a l=2 must be in the:
Respuesta
-
3p subshell
-
3d subshell
-
3s subshell
-
3f subshell
Pregunta 35
Pregunta
A 2p subshell contains how many orbitals?
Respuesta
-
1
-
2
-
3
-
5
Pregunta 36
Pregunta
When l=4, n must have a minimum value of :
Respuesta
-
4
-
5
-
6
-
1
Pregunta 37
Pregunta
According to the energy order building up principle which statement(s) below is never correct.
Respuesta
-
a) 3p fills after 3s
-
b) 4s fills before 3d
-
c) 2s fills after 1s
-
d) 5s fills before 4p
-
e) a and d
-
f) b and d
Pregunta 38
Pregunta
Choose the correct statement below in terms of atomic size.
Respuesta
-
Te<Ag<Ru<Rb<Cs
-
Ru<Ag<Te<Rb<Cs
-
Cs<Ag<Te<Rb<Cs
-
Cs<Rb<Ru<Ag<Te
Pregunta 39
Pregunta
Ionization energy refers to the amount of energy required to add an electron to the valence shell of a gasoline atom.
Respuesta
- True
- False
Pregunta 40
Pregunta
Which species would you expect to have the greatest ionization energy associated with it?
Respuesta
-
Al+2
-
Al+1
-
Al
-
Al+3
Pregunta 41
Pregunta
How many electrons are shared when the ionic compound MgS2 is formed?
Respuesta
-
0
-
2
-
3
-
1
Pregunta 42
Pregunta
Which of the following is correct in terms of ionic radii:
Respuesta
-
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
Pregunta 43
Pregunta
Which of the following would you expect to have the highest melting point?
Respuesta
-
BaS
-
LiCl
-
Al2O3
-
MgCl2
Pregunta 44
Pregunta
Which noble gas is Ca+2 isoelectronic with?
Respuesta
-
Ne
-
Ar
-
Kr
-
Xe
Pregunta 45
Pregunta
Which is the most electronegative atom?
Respuesta
-
Cl
-
H
-
O
-
F
Pregunta 46
Pregunta
Which atoms are most likely to form triple bonds?
Respuesta
-
C, N, O and Cl
-
C and P
-
C and O
-
C, N and S
Pregunta 47
Pregunta
Which bond is most polar?
Respuesta
-
HCl
-
HBr
-
HO
-
HI
Pregunta 48
Pregunta
How many resonance Lewis electron dot structures does O3 have?
Respuesta
-
1
-
2
-
3
-
4
Pregunta 49
Pregunta
Which bond would require the most energy to break?
Respuesta
-
H-C
-
C=C
-
C≡C
-
C-C
Pregunta 50
Pregunta
The molecule CO2 is a polar molecule.
Respuesta
- True
- False
Pregunta 51
Pregunta
Which of the following describes the bond angles if a central atom has 5 groups around it?
Respuesta
-
90° and 180°
-
90°, 120° and 180°
-
120°
-
90°
Pregunta 52
Pregunta
What is the name of the molecular geometry about the central atom in PCl3?
Respuesta
-
trigonal pyramidal
-
tetrahedral
-
bent
-
distorted tetrahedron
Pregunta 53
Pregunta
Which of the following is a nonpolar molecule?
Respuesta
-
KrF2
-
AsF3
-
SF2
-
CH3F
Pregunta 54
Pregunta
What is the hybridization about the Xe atom in XeF4?
Respuesta
-
sp3
-
sp
-
sp3d
-
sp3d2
Pregunta 55
Pregunta
Which statement below is most accurate with regard to the total number of σ and π bonds in HCOCH3?
Respuesta
-
5 σ and 2 π bonds
-
7 σ bonds
-
6 σ and 1 π bonds
-
1 π bond
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