Lewis Dot Structure
Ionic Bonding
Ionic Bonding
Covalent Bonding
Covalent Bonding
Balancing Chemical Equations
100
Sal drew the electron dot diagram of an aluminum atom as shown. How should Sal correct his diagram?
He should add a single dot below the symbol.
100
When a metal loses electrons, it becomes what?
a Positively charged ions
100
What does the Lewis Dot Structures help visualize?
Electron arrangement and bonding.
100
What is Covalent Bonding
When two atoms share electrons
100
Which describes the substances that form covalent bonds?
a. a metal and a metalloid
b. a metal and a nonmetal
c. two nonmetals
d. two metals
c. two nonmetals
100
Which condition must be met in order for an equation to be balanced?
The number of atoms in the reactants equals the number of atoms in the products.
200
How many valence electrons are in an atom of fluorine?
7
200
What causes an ionic bond to form between sodium and chlorine?
Sodium atoms donate electrons.
200
What is a cation?
Positively charged atom
200
The element sulfur (S) is most likely to form covalent bonds with the element
a. helium (He).
b. magnesium (Mg).
c. zinc (Zn).
d. oxygen (O).
d. oxygen (O).
200
Which is most likely a covalent compound?
a. LiF
b. MgS
c. NH3
d. CaCl2
c. NH3
200
Which balances the equation Mg + O2 → MgO?
2Mg + O2 → 2MgO
300
How would an electron shell model of an oxygen atom (O) appear after the atom has formed chemical bonds?
a. It would have six electrons in the outermost shell.
b. It would have six electrons in the innermost shell.
c. It would have eight electrons in the outermost shell.
d. It would have eight electrons in the innermost shell.
c. It would have eight electrons in the outermost shell.
300
Which shows the correct order of steps during the formation of an ionic bond?
a. Ions are attracted to each other → Electrons are transferred → An ionic compound forms
b. An ionic compound forms → Ions are attracted to each other → Electrons are transferred
c. Electrons are transferred → Ions form → Ions are attracted to each other
d. Ions form → Electrons are transferred → Ions are attracted to each other
c. Electrons are transferred → Ions form → Ions are attracted to each other
300
What will most likely occur if sulfur forms an ionic bond with another element?
Sulfur will accept electrons.
300
How many electrons are shared between the two carbon atoms?
2
300
What statement best describes the arrangement of the atoms in an ethylene molecule?
a. Each carbon atom shares four electrons with one hydrogen atom and also shares four electrons with the other carbon atom.
b. One electron is shared between each hydrogen atom and the carbon atom bonded to it, and two electrons are shared between the carbon atoms.
c. Two electrons are shared between each hydrogen atom and the carbon atom bonded to it, and four electrons are shared between the carbon atoms.
c. Two electrons are shared between each hydrogen atom and the carbon atom bonded to it, and four electrons are shared between the carbon atoms.
300
Which is the balanced equation for S8 + O2 → SO2?
S8 + 8O2 → 8SO2
400
Which element has fewer than four dots in its electron dot diagrams?
a. arsenic (As)
b. sulfur (S)
c. krypton (Kr)
d. gallium (Ga)
d. gallium (Ga)
400
Which two elements will most likely form an ionic bond?
a. krypton and lithium
b. magnesium and bromine
c. calcium and potassium
d. iodine and chlorine
b. magnesium and bromine
400
which pair of elements is most likely to form an ionic bond?
a. potassium (K) and fluorine (F)
b. aluminum (Al) and aluminum (Al)
c. sulfur (S) and oxygen (O)
d. calcium (Ca) and neon (Ne)
a. potassium (K) and fluorine (F)
400
In carbon dioxide (CO2), there are two oxygen atoms for each carbon atom. Each oxygen atom forms a double bond with carbon, so the molecule contains two sets of double bonds.
Two sets of double bonds means that the total number of electrons being shared in the molecule is
a. two.
b. four.
c. six.
d. eight
d. eight
400
Which diagram shows how the incorrect covalent bonds?
a.
b.
a
400
he equation for water is H2 +O2 → H2O. To balance the equation, which coefficient should be placed in front of H2 and H2O?
2
500
How many dots belong in the electron dot diagram of a boron (B) atom?
3
500
This chart shows characteristics of three different types of atoms.
Which statement is best supported by the information in the chart?
a. Atom X will donate electrons to Atom Y.
b. Atom X will accept electrons from Atom Y.
c. Atom Y will accept electrons from Atom Z.
d. Atom Z will donate electrons to Atom X
b. Atom X will accept electrons from Atom Y.
500
These diagrams show two atoms of fluorine and an atom of magnesium.
Which shows the correct steps in the formation of an ionic bond between these atoms?
a. A magnesium atom donates two electrons to the fluorine atoms → Each fluorine atom accepts one of the electrons → The magnesium atom becomes a -2 ion → Each fluorine atom becomes a +1 ion
b. A magnesium atom accepts two electrons from the fluorine atoms → Each fluorine atom donates one of the electrons → The magnesium atom becomes a -2 ion → Each fluorine atom becomes a +1 ion
c. A magnesium atom donates two electrons to the fluorine atoms → Each fluorine atom accepts one of the electrons → The magnesium atom becomes a +2 ion → Each fluorine atom becomes a -1 ion
c. A magnesium atom donates two electrons to the fluorine atoms → Each fluorine atom accepts one of the electrons → The magnesium atom becomes a +2 ion → Each fluorine atom becomes a -1 ion
500
Name the covalent compound H2O2.
Dihydrogen Dioxide
500
Name the covalent compound NH3.
Nitrogen Trihydrogen
500
Charlie is balancing an equation. She has identified the atoms and counted the number of each in the reactants and products. What would Charlie adjust to make the number of atoms in the reactants the same as the number of atoms in the products?
coefficients