chemical bonding 1
chemical bonding 2
Bohr Diagrams and Electron Configuration
Gas Laws and Plate Tectonics
Metric Conversions and Energy Transfer.
100
What is the name of the group of elements on the Periodic Table that already are fulfilling the conditions of the Octet Rule?
Noble Gases
The Noble Gases elements have the maximum number of valence electrons on their last energy level fulfilling the Octet Rule.
100
Which type of bond is formed when an atom of sodium transfers an electron to a fluorine atom?
(a) metallic (b) ionic
(c) polar covalent (d) nonpolar covalent
(b) ionic
Sodium is a metal, who will give its valence electron to fluorine, which is a nonmetal.
100
A covalent bond is likely to form between which of the following pair of elements below:
(a) potassium and bromine
(b) nitrogen and hydrogen
(c) magnesium and fluorine
(d) sodium and chlorine
(b) nitrogen and hydrogen
Nitrogen and hydrogen are both nonmetals.
100
Which of the following chemical formulas below would represent an accurate covalent bond between carbon and hydrogen?
(a) CH (b) CH2
(c) CH3 (d) CH4
(d) CH4
Carbon has 4 valence electrons so it will take 4 hydrogens to form a complete covalent bond where both carbon and hydrogen can fulfill the Octet Rule.
100
Which element consists of positive ions immersed in a “sea” of mobile electrons?
(a) sulfur (b) nitrogen (c) calcium (d) chlorine
(c) Calcium
Metals form positive ions and when they bond with each other in a "sea" of mobile electrons they form metallic bonds.
200
Elements that have atoms with stable valence electron configurations are found in
(a) Group 1 (b) Group 8
(c) Group 11 (d) Group 18
(d) Group 18
Group 18 consists of the Noble Gases, which have the maximum number of electrons on their last energy level so they are the most stable elements.
200
Ionic bonding can only occur between which of the following?
(a) A nonmetal and a nonmetal
(b) A metal and a nonmetal
(c) A metal and a metalloid
(d) A nonmetal and a metalloid
(b) A metal and a nonmetal
Ionic bonding occurs between a metal and nonmetal.
200
The bond between Br atoms in a Br2 molecule is
(a) ionic and is formed by the sharing of two valence electrons
(b) ionic and is formed by the transfer of two valence electrons
(c) covalent and is formed by the transfer of two valence electrons
(d) covalent and is formed by the sharing of two valence electrons
(d) covalent and is formed by the sharing of two valence electrons
Bromine is a nonmetal so they will share their electrons with one another.
200
WRITE OUT THE CHEMICAL FORMULA FOR MAGNESIUM NITRIDE.
Mg3N2
Magnesium has a +2 charge and Nitrogen has a -3 charge. It will take thee magnesiums to balance out the charges of two nitogens.
200
In a chemical formula which element would be written first?
K or O
I or C
K and C
The most metal element is written first in the formula.
300
Which element below tends NOT to react with other elements?
(a) helium (b) hydrogen
(c) phosphorus (d) potassium
(a) helium
Helium is a Noble Gas. The Noble Gas elements hardly react with other elements because they are stable and already fulfill the Octet Rule unlike the rest of the elements on the Periodic Table.
300
When a nonmetal reacts with a metal, the nonmetal will
(a) lose electrons and form a positive ion
(b) lose protons and form a positive ion
(c) gain electrons and form a negative ion
(d) gain protons and form a negative ion
(c) gain electrons and form a negative ion
In an ionic bond, nonmetals gain electrons and form a negative ion (anion).
300
In a NONPOLAR covalent bond, electrons are
(a) located in a mobile “sea” of positive ions (b) transferred from one atom to another
(c) shared equally between atoms (d) shared unequally between atoms
(c) shared equally between atoms
In a nonpolar covalent bonds, the electrons are shared equally between the bonding atoms.
300
WRITE OUT THE CHEMICAL NAME FOR THE FOLLOWING COVALENT COMPOUND: N2O5
Dinitrogen Pentoxide
Di-2
Pent-5
300
Which properties are characteristic of Group 2 metals elements?
(a) good electrical conductivity and electronegativities greater than 1.7
(b) good electrical conductivity and electronegativities less than 1.7
(c) poor electrical conductivity and electronegativities greater than 1.7
(b) good electrical conductivity and electronegativities less than 1.7
Metals are good conductors of electricity and have low electronegativities (low attraction for electrons in a chemical bond)
400
NAME TWO WAYS in which atoms can fulfill the Octet Rule.
Atoms can either TRANSFER their electrons (lose or gain) in an ionic bond.
Atoms can SHARE their electrons between each other in a covalent bond.
400
Describe the electronegativities of the elements in an ionic bond
the electronegativities are very different - metals are low and nonmetals are high
400
What is the number of electrons shared between the atoms in an I2 molecule as shown below?
(a) 7 (b) 2 (c) 8 (d) 4
(b) 2
Each bond between an atom represents two electrons being shared.
400
DRAW AN ELECTRON DOT DIAGRAM OF DIHYDROGEN MONOXIDE.
400
The particle below represents a solid sample of silver.
Which type of bonding is present when valence electrons move within the sample as a “sea” of valence electrons?
(a) metallic bonding (b) hydrogen bonding (c) covalent bonding (d) ionic bonding
(a) metallic bonding
Valence electrons move within metal atoms as a "sea" of valence electrons to form metallic bonds.