GenChem 1 Flashcards
Which quantum number tells us the shape or the region an electron occupies?
A. Angular Momentum Quantum Number
B. Principal Quantum Number
C. Magnetic Quantum Number
A. Angular Momentum Quantum Number
Which quantum number relates to the average distance of the electron from the nucleus in a particular orbital?
A. Angular Momentum Quantum Number
B. Principal Quantum Number
C. Magnetic Quantum Number
B. Principal Quantum Number
How many possible values of ml are there if l=1?
3
How many possible values of ml are there if l=2?
5
Which of the following is NOT a valid set of quantum numbers?
A. 2,1,0,-1/2
B. 3,3,-2,-1/2
C. 2,1,-1,1/2
D. 4,3,2,1/2
B. 3,3,-2,-1/2
5,5,5,1/2 is not a valid set of quantum numbers. Which of the following is not correct?
A. It is not valid because there is no equivalent orbital for l=5. The equivalent values of l for each orbital are 0=s, 1=p, 2=d, and 3=f.
B. It is not valid because there are three quantum numbers with the value of 5. It can only have two equal values of quantum numbers and that should only be in l and ml.
C. It is not valid because the value of principal quantum number (n) should not be equal to the value of the angular momentum quantum number (l). If l=4, then n should be greater than 4.
D. It is not valid because the value of angular momentum quantum number (l) should not be equal to the value of the principal quantum number (n). The value of the angular momentum quantum number (l) should be less than the value of principal quantum number.
A. It is not valid because there is no equivalent orbital for l=5. The equivalent values of l for each orbital are 0=s, 1=p, 2=d, and 3=f.
There is an equivalent orbital for l=5.
0=s
1=p
2=d
3=f
4=g
5=h
Why are quantum numbers important?
Quantum numbers describe the atomic orbitals and the distribution of electrons in an atom.
What is a paramagnetic substance?
A material that contain net unpaired spins and are attracted by a magnet.
What is a diamagnetic substance?
A material that do not contain net unpaired spins and are slightly repelled by a magnet.
What is the magnetic property of an atom with an electron configuration of 1s2 2s2 2p1?
A. Paramagnetic, because there are no unpaired electrons in its orbital diagram.
B. Diamagnetic, because there are no unpaired electrons in its orbital diagram.
C. Paramagnetic, because there are unpaired electrons in its orbital diagram.
D. Diamagnetic, because there are unpaired electrons in its orbital diagram.
C. Paramagnetic, because there are unpaired electrons in its orbital diagram.
Which among the electron configurations follow the Aufbau principle?
A. 1s2 2s1 2p1
B. 1s2 2s2 2p1
C. 1s2 2s2 2p3 3s1
D. 1s2 2s2 2p3 3s2
B. 1s2 2s2 2p1
According to Aufbau principle, electrons are added in the atomic orbitals from lowest energy to highest energy.
What rule states that no two electrons in an atom can have the same four quantum numbers?
Pauli Exclusion Principle
A cation is formed when an atom loses electron. Which of the following is NOT CORRECT?
A. sodium loses one electron forming a 1+ charge.
B. fluorine gains one electron forming 1- charge.
C. soidum is in group 1 that is why it has 1 valence electrons.
D. fluorine is in period 2 so it can occupy more than 8 electrons
D. fluorine is in period 2 so it can occupy more than 8 electrons
Period 2 elements cannot have an expanded octet.
An anion is formed when an atom gains electron. Which of the following is CORRECT?
A. oxygen forms a cation with a 2- charge.
B. oxygen is found in group 7 in the periodic table.
C. The noble gas configuration of oxygen is equal to the electron configuration of helium.
D. The noble gas configuration of oxide ion (O2-) is equal to the electronic configuration of neon.
D. The noble gas configuration of oxide ion (O2-) is equal to the electronic configuration of neon.
The noble gas configuration of oxide ion is [He] 2p6 which is equivalent to the electronic configuration of neon 1s2 2s2 2p6.
What does the octet rule state in the context of molecular covalent compounds?
Elements tend to form compounds with eight valence electrons.
Which of the following is TRUE about the formation of sulfur hexachloride, SCl6?
A. Sulfur is in group 6, therefore it has 6 valence electrons that can be donated to fluorine atoms.
B. Sulfur has 6 valence electrons that should be bonded to 6 other atoms.
C. Sulfur can only share 2 electrons to satisfy the octet rule so the formula is incorrect.
D. Sulfur is in period 3, therefore it can have an expanded octet.
Which is the correct formula for C and F following the octet rule?
A. C4F
B. CF4
C. CF5
D. C2F2
B. CF4
Which is the correct formula for Al and Cl following the octet rule?
A. AlCl3
B. Al3Cl
C. AlCl
D. AlCl4
A. AlCl3
What is the molecular geometry of NF3?
Trigonal pyramidal
What is the molecular geometry of CH4?
tetrahedral
What is the molecular geometry of ClF3?
T-shaped
What is the molecular geometry of H2O?
bent
What is the polarity of dichlorodifluoromethane, CCl2F2?
A. Dichlorodifluoromethane is a polar molecule because the resultant dipole moment is going towards fluorine atoms which is more electronegative than the other two atoms.
B. Dichlorodifluoromethane is a nonpolar molecule because the resultant dipole moment is going towards chlorine atoms which is more electronegative than the other two atoms.
C. Dichlorodifluoromethane is a polar molecule because the resultant dipole moment is going towards chlorine atoms which is more electronegative than the other two atoms.
D. Dichlorodifluoromethane is a nonpolar molecule because the resultant dipole moment is going towards chlorine atoms which is more electronegative than the other two atoms.
A. Dichlorodifluoromethane is a polar molecule because the resultant dipole moment is going towards fluorine atoms which is more electronegative than the other two atoms.
Which of the following is CORRECT about the polarity of carbon dioxide?
A. Carbon dioxide is a polar because the bond between atoms of carbon and oxygen is nonpolar.
B. Carbon dioxide is a polar molecule because the dipole moments are in opposite direction, cancelling out each other.
C. Carbon dioxide is a nonpolar because the bond between atoms of carbon and oxygen is nonpolar.
D. Carbon dioxide is a nonpolar molecule because the dipole moments are in opposite direction, cancelling out each other.
D. Carbon dioxide is a nonpolar molecule because the dipole moments are in opposite direction, cancelling out each other.
Which of the following functional groups has the hydroxyl group in its structure?
A. Aldehyde
B. Ether
C. Ketone
D. Alcohol
D. Alcohol
- Which of the following functional groups has the carbonyl group in its structure?
A. Ester
B. Alcohol
C. Amine
D. Aldehyde
A. Ester
Which of the following is NOT TRUE about the special nature of carbon?
A. It has the ability to share not only a single electron, but also two or three electrons forming double or triple bonds, respectively.
B. It has the ability to form a bond with other carbon atoms like links in chain.
C. The linkage of atoms of carbon can form straight chain, branched chain, and cyclic ring.
D. Carbon compounds are generally shorter and less durable.
D. Carbon compounds are generally shorter and less durable.
Which of the following is NOT TRUE about saturated and unsaturated hydrocarbons?
A. Saturated hydrocarbons contain the maximum amount of hydrogen atoms that can bond with the number of carbon atoms.
B. Unsaturated hydrocarbons are compounds with bonds that enables them to add hydrogen atoms.
C. Alkenes and alkynes are unsaturated hydrocarbons.
D. Saturated hydrocarbons can have multiple bonds.
D. Saturated hydrocarbons can have multiple bonds.
What do you call isomers that differ in the order in which atoms are connected?
structural isomers
Which type of polymerization involves unsaturated compounds containing double or triple bonds?
A. Saponification
B. Condensation
C. Addition
D. Vulcanization
C. Addition
What are the steps in addition polymerization?
Initiation
Propagation
Termination
Which of the following is NOT true about LDPE and HDPE?
A. LDPE is more flexible than HDPE.
B. LDPE can withstand higher temperature than HDPE.
C. LDPE is weaker than HDPE.
D. HDPE has higher density than LDPE due to its polymer arrangement.
B. LDPE can withstand higher temperature than HDPE.
I. Won’t melt or reshape.
II. Suited to higher temperature
III. Recyclable
IV. Keep their plastic properties
V. Made of long linear polymer chains
VI. Polymer chains are cross-linked
Which statements describe thermosets?
I, II, VI
What are the parts of a nucleotide?
Phosphate group
Pentose sugar
Nitrogenous base
What are the glucose polymers in starch?
Amylose and Amylopectin
