When naming a binary covalent compound, what determines the prefix for an element in the compound?
The total number of atoms in the compound.
The number of valence electrons in the element.
The number of different elements in the compound.
The number of atoms of that element in the compound.
In hybridization, how do you know how many hybrid orbitals are formed?
It is the same as the total number of electrons.
It is the same as the number of orbitals that have combined.
It is the same as the total number of atoms in the molecule.
It is the same as the number of valence electrons.
If a polyatomic ionic compound has gained two hydrogen ions, such as H2 PO4 -. How does its name begin?
Hydrous
Dihydrogen
Hydrogen (II)
Hydrogen
In larger atoms, why can outer electrons move more freely?
Larger atoms have more electrons, atom less stable
no answer
atoms have more protons, which means more electron moves
Electrons are in higher energy shells, less tightly held.
How many elements of unsaturation does a molecule with this chemical formula have? C5H8
5
3
1
2
Which of the following is an example of an ionic compound?
Na
O3
NaCl
CO2
Why must we consider a molecule's shape when determining its polarity?
Non polar molecules have dipoles that do not cancel out
Symmetrical molecules are always non polar.
The shape reveals more about distribution of charge.
A molecule may have different shapes depending its polarity
How many valence electrons are in a carbon dioxide (CO2) molecule?
16
12
24
8
If a central atom of a molecule only has two electron domains, what is the bond angle associated with the molecule?
109.5o
180o
90o
120o
When drawing Lewis dot structures, what should you do if you run out of electrons before all atoms are satisfied?
Make a resonance structure.
Try double or triple bonds.
Add the missing electrons.
Leave it as it is.
What do you look at in the periodic table to determine the number of valence electrons possessed by an element?
The element's group number.
The element's atomic mass.
The element's atomic number.
The element's row number.
Identify the atom that is likely to have the highest electronegativity.
Non-metal selenium, atomic number 34
Metal magnesium, atomic number 12
Non-metal oxygen, atomic number 8
Metal beryllium, atomic number 4
What happens when both of the orbitals in a molecule are in phase, either both positive or both negative, and the electrons in the bonds are at their lowest energy level?
Bonding takes place.
The chemicals don't react.
The atoms don't bond.
The electrons in the atoms don't share orbitals.
What is an example of a naturally occurring inorganic macromolecule?
Nucleic Acid
Sucrose
Diamond
Glucose
How does an atom try to achieve a complete valence shell?
By sharing electrons.
By adding electrons.
All answers are correct.
By giving away electrons.
Why are metals shiny?
Because they absorb light photons.
Because they reflect light photons.
Because they have mobile protons.
Because they can be polished to a high gloss.
