Electrons in Atoms
Ionic Bonding
Covalent Bonding
Why'd We Do That?
About Your Teacher
100
Draw out the orbital notation electron configuration for a neutral silicon atom.
100
What is the main reason that atoms form ions?
a. to bond with other elements
b. to create a negative charge
c. to develop a positive charge
d. to fill their outer electron shells
d. to fill their outer electron shells
100
Which of the following correctly shows the bond polarity?
a. π +P - Nπ -
b. π +I - Iπ -
c. π +F - Clπ -
d. π +O - Sπ -
a. π +P - Nπ -
100
electron configuration in atoms
100
True or False - Ms. Long learned English and Chinese as a child.
False
200
The ground state electron configuration for an element contains an unpaired 3s electron. Which of the following is the identity of the element?
a. Li
b. Na
c. Mg
d. K
b. Na
200
The compound KBr is commonly used in veterinary medicine to treat epilepsy in dogs. On the basis of periodic properties, which of the following compounds can most likely also be used to treat canine epilepsy?
a. CBr4
b. NaBr
c. C3H8O
d. K
b. NaBr
200
Which of the following correctly lists the substances HCN, N2, and HF in order of increasing IMFs?
a. HCN < N2 < HF
b. N2 < HCN < HF
c. HF < N2 < HCN
d. N2 < HF < HCN
b. N2 < HCN < HF
200
What was the purpose of this lab?
Observe differences in MP and conductivity in ionic and covalent compounds
200
Why was Ms. Long absent for one week in December?
She attended her brother's wedding
300
In which of the following ionic compounds is the force of attraction between the cation and anion the strongest?
a. RbI
b. CsI
c. MgO
d. SrS
c. MgO
300
The Lewis structure of vinyl fluoride is shown on the right. Which of the following identifies the strongest intermolecular force present among molecules of vinyl fluoride?
a. LDF
b. Dipole-Dipole
c. Hydrogen Bonding
d. Ionic Bonding
b. Dipole-Dipole
300
In class, you followed the procedure below:
Place one penny on a paper towel.
Drop the water onto the surface of the penny, slowly, one drop at a time using the pipet.
Count how many drops it takes until the water spills off the penny.
Record the number of drops.
Dry the penny.
Repeat steps 1-5 using isopropanol.
Write your data on the board in the Class Data Table.
Calculate the average of the class data for water drops and for isopropanol drops.
Compare the number of drops of isopropanol to the number of drops of water.
What property of the solutions was being observed?
Intermolecular Forces - Hydrogen bonding, dipole-dipole, and LDF
300
Which of the following classes has Ms. Long never taught at this school?
a. 7th grade English
b. AP Environmental Science
c. 8th grade English
d. Regular Environmental Science
e. Regular Earth and Space Science
b. AP Environmental Science
400
Which rule states that electrons in the same orbital cannot have the same spin?
Pauli exclusion principle
400
The electron configurations of four different elements are shown below.
Element 1: 1s22s22p4
Element 2: 1s22s22p5
Element 3: [Ne]3s23p1
Element 4: [Kr]5s1
Based on their electron configurations, which of the following two elements are most likely to form an ionic compound with the formula X2Y?
Element 1 and Element 4
400
Draw the Lewis Dot Structure and use the VSEPR theory to predict the shape and bond angle of the nitrate ion.
trigonal planar, 120 degrees
400
We watched videos showing various alkali metals and their reactivities in water. Explain why reactivity of alkali metals increases as one moves from top to bottom of the periodic table. You must describe two periodic trends to support your explanation.
Atomic radii increases going down the group because more electrons occupy more orbitals, which causes ionization energy to decrease going down the group because the valence electrons are farther from the nucleus and are therefore more easily removed. This causes reactivity to increase going down the group
400
What was Ms. Long's major and which university did she attend?
Biology - University of North Carolina at Chapel Hill
500
The ground state electron configuration for an element is [Kr]4d105s2. You may also see this electron configuration written as [Kr]5s24d10. Which of the following is the identity of the element?
a. Zn
b. Kr
c. Sr
d. Cd
d. Cd
500
Sodium, a reactive metal, and chlorine, a poisonous gas, can be combined to form table salt. Using chemistry terminology, discuss the formation of table salt and explain why this new substance is mostly non-reactive. Be sure to include the chemical names and formulas of everything involved in the reaction - this includes ions and neutral substances. (4 points - all or nothing)
Sodium, Na, loses an electron to form Na+. (1 point)
Chlorine, Cl, gains an electron to form Cl-. (1 point)
Na+ and Cl- are attracted to each other (1 point)
and make the neutral compound, NaCl, called sodium chloride (1 point)
500
Explain why some VSEPR shapes have smaller bond angles, even though they have the same number of electron densities.
lone pairs of electrons occupy more space around the atom
so they will push the neighbors farther away
500
In the activity - The Nameβs Bond, Chemical Bond: Agent Forever Chemical - which chemical did we study? Why is this chemical causing so many problems?
PFAS - made up of many CF bonds, which are strong and difficult to break, causing PFAS to persist in the environment for a long time
500
Ms. Long has had all of the following jobs except:
a. Fitness Instructor
b. Psychology Lab Research Assistant
c. Dance Teacher
d. Biology Lab Research Assistant
d. Biology Lab Research Assistant