AC-2022 Flashcards
- Which of the following is the heaviest?
A. proton
B. neutron
C. electron
D. nucleus
nucleus
Which of the following is an extensive property of matter?
A. density
B. viscosity
C. freezing point
D. number of moles
number of molecules
Mothballs are used as deodorizers and as pesticides. Upon exposing them in the air for a few hours they disappeare D. Which of the following best explains the scenario?
A. The mothballs underwent sublimation.
B. The mothballs underwent melting then vaporization. C. The mothballs reacted with some component in the air.
D. None of the above.
the mothballs underwent sublimation
Which of the following is described as having components that CAN NOT be physically separated?
A. mixture
B. solution
C. suspension
D. pure substance
pure substance
Which of the following is TRUE for C-13 isotope?
A. It has 6 neutron and 7 protons.
B. It has 6 protons and 7 neutrons.
C. It has 6 neutron and 13 protons.
D. It has 6 protons and 13 neutrons.
It has 6 protons and 7 neutrons.
Chlorine (35.45 g/mol) has two major naturally occurring isotopes Cl-35 and Cl-37. What is the abundance of the lighter isotope?
A. 22.5
B. 33.5
C. 66.5
D. 77.5
77.5
Ave. atomic mass = (A x m1)+ (B x m2)
B = 1-A
Which of the following is NOT a possible set of quantum numbers?
A. n = 3 l = 1 ml = -1 ms = -1/2
B. n = 3 l = 0 ml = 0 ms = -1/2
C. n = 3 l = 0 ml = -1 ms = -1/2
D. n = 3 l = 1 ml = 0 ms = -1/2
n = 3 l = 0 ml = -1 ms = -1/2
Which of the following corresponds to the electron configuration 1s2 2s2 2p6?
A. Na
B. Na+
C. Cl
D. Cl-
Na+
(2+2+6) = 10e-
Na+ = 11e–1 = 10e-
What is the correct scientific notation for 0.0078 µg/mL of compound A?
A. 7.8x10-1 µg/mL
B. 7.8x10-2 µg/mL
C. 7.8x10-3 µg/mL
D. 7.8x10-4 µg/mL
7.8x10-3 µg/mL
Which of the following group is commonly used as components in pesticides? This group is also characterized as having seven valence electrons.
A. Alkali metals
B. Chalcogens
C. Halogens
D. Noble gases
Halogens
Which is the correct arrangement for increasing affinity for electrons?
A. K < Na < Cl < Ne
B. Na < K < Cl < Ne
C. Ne < K < Na < Cl
D. Ne < Na < K < Cl
Ne < K < Na < Cl
noble gas - very low electron affinity
Which of the following atoms is the largest?
A. Cs
B. Sr
C. Ga
D. As
Cs
Fluorine is capable of forming covalent bonds with which of the following element?
A. Zinc
B. Boron
C. Lithium
D. Calcium
Boron
Which of the following does NOT describe a nonpolar bond?
A. It is a bond between similar nonmetals.
B. It is a bond between different nonmetals.
C. It has a dipole moment.
D. All describe a nonpolar bond
It has a dipole moment.
Dipole -> unequal distribution –> polar
Which of the following statements is TRUE?
A. Double bonds are shorter than triple bonds.
B. Double bonds are stronger than triple bonds.
C. Single bonds have lower energy than double bonds. D. None of the statements above is true.
Single bonds have lower energy than double bonds.
BO=BS=BE=1/BL
Which of the following is a polar molecule?
A. CO2
B. SF4
C. CCl4
D. XeF4
SF4
polar - net dipole - unequal
nonpolar - equal
Which compound has the greatest intermolecular force of attraction?
A. CO
B. CH4
C. CH3OH
D. CH3OCH3
CH3OH
What is the name of the compound PCl3?
A. Phosphorus chloride
B. Phosphorus trichloride
C. Phosphorus chloride(III)
D. Phosphorus trichloride(III)
Phosphorus trichloride
What is the chemical formula of plumbous oxide?
A. PbO
B. Pb2O2
C. PbO2
D. PbO4
PbO
Which of the following is the correct composition of aqua regia?
A. 1 HNO3: 3 HCl
B. 3 HNO3: 1 HCl
C. 2 HNO3: 3 HCl
D. 3 HNO3: 2 HCl
A. 1 HNO3: 3 HCl
1 part nitric acid to 3 parts hydrochloric acid.
Sodium carbonate is also known as?
A. baking soda
B. soda ash
C. caustic potash
D. caustic soda
soda ash
The standard pressure of the atmosphere at sea level is A. 1 atm
B. 760 mm Hg
C. 760 torr
D. all of the above
all of the above
At 25°C a gas expands from 30 kPa and 5.0 L to 70°C and 10 kP A. Calculate its final volume
A. 17 L
B. 24 L
C. 42 L
D. 71 L
17L
What is the density of oxygen at 1 atm and 25°C?
A. 1.31 g/mL
B. 1.31 g/L
C. 15.6 g/mL
D. 15.6 g/L
1.31 g/L