Ions
Ionic Bonds
Covalent Bonds
Ionic vs. Covalent
Naming Compounds
100
Why do atoms give or take electrons? Why do they do that?
To have a full outer energy level.
100
Ionic bonds form between ______ & ______.
Metals and Nonmetals
100
Covalent Bonds form between ______ & ______.
Nonmetals & Nonmetals
100
What is the difference between ionic and covalent compounds as far as electrons are concerned?
Atoms in ionic compounds transfer electrons to each other, and in covalent compounds the atoms share electrons
100
Name the ionic compound: Li2O
Lithium Oxide
200
Do metals tend to give away or take valence electrons?
Give away
200
Draw the lewis dot structure for Sodium Sulfide.
200
Draw the lewis dot structure of a covalent compounds that is composed of Oxygen & Flourine
200
Do ionic compounds have a low or high melting point?
High melting point.
(It takes a lot of energy to break ionic bonds)
200
Name the covalent compound: CH4
Carbon tetrahydride
300
Why does an ion of Magnesium (#12) have a 2+ charge?
Magnesium ions have two more protons than they do electrons.
300
How many ions of Potassium (#19) will there be in an ionic bond between Potassium and Nitrogen (#7)?
3
300
How many bonds (sharing of 2 e-) will there be between two Oxygen atoms?
2 bonds (see below)
300
When dissolved in water, are covalent compounds good or poor conductors?
Poor
300
Name this compound: H2S
dihydrogen monosulfide
400
What charge would an ion of Nitrogen (#7) have?
-3
400
What holds the atoms in ionic bonds together?
The ion's opposite charges.
Ex. Na+ and F-...the opposite charges make the ions "stick" together.
400
Name 3 diatomic molecules.
(Write the chemical formula. )
Potential Aanswers:
H2, N2, F2, O2, I2, Cl2, Br2
400
Why is the melting point of covalent compounds so low?
Atoms in covalent compounds have to share electrons, this means they do not have 8 valence e- to themselves (ie. not 100% "happy"). Thus, it does not take much energy to break their bond.
400
Name this compound: CuCl2
Copper Chloride
500
Will Silicon (#14) form an ion? Why/Why not?
Silicon has 4 valence electrons; it takes a lot of energy to give or take electrons, so it will share electrons instead. No ion will form.
500
True or False?
Chlorine (#17) can form an ionic bond with all group 1 elements.
False - Hydrogen is a nonmetal and will form a covalent bond with Chlorine
500
What holds the atoms in covalent bonds together?
The shared electrons are attached to BOTH nuclei
500
Why do ionic compounds conduct when dissolved in water?
Water separates the ionic compound into it's two ions. The ions are charged particles, and will conduct electricity in water.
500
Name this compound: PbNO3
Lead Nitrate