How do you represent a triple bond in a structural formula?
::: or three horizontal lines
= or ::
- or .
:::: or four horizontal lines
What is an anion?
An atom that has gained a valence electron and is negative.
An atom that has lost a valence electron and is positive.
An atom that has gained a valence electron and is positive.
An atom that has lost a valence electron and is negative.
How does an atom try to achieve a complete valence shell?
By sharing electrons.
All answers are correct.
By giving away electrons.
By adding electrons.
What causes a dipole?
When the molecules are repelled from each other.
When the electrons are concentrated more 1 end of a molecule
When the protons are concentrated more at one end
When the molecules are attracted to each other.
How many elements of unsaturation does a molecule with this chemical formula have? C5H8
2
1
3
5
What do you look at in the periodic table to determine the number of valence electrons possessed by an element?
The element's atomic number.
The element's group number.
The element's atomic mass.
The element's row number.
Which of these do you need to know to use the hybridization theory?
The number of valence electrons in the participating atoms
How many of each molecule are being made
The total number of electrons in the participating atoms
What period the element is in on the periodic table
Which of the following is NOT a property of covalent compounds?
Poor conductors of heat and electricity
Superior malleability
Low boiling points
Solids are brittle and variously colored
How is an organic compound described?
Any compound that contains carbon plus another element.
Any compound that is involved in a living thing.
Any compound that contains carbon.
Any compound that is organic.
Identify the atom that is likely to have the highest electronegativity.
Metal beryllium, atomic number 4
Non-metal oxygen, atomic number 8
Non-metal selenium, atomic number 34
Metal magnesium, atomic number 12
What is an example of a naturally occurring inorganic macromolecule?
Diamond
Glucose
Sucrose
Nucleic Acid
In hybridization, how do you know how many hybrid orbitals are formed?
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.
It is the same as the total number of electrons.
A cation has a _____ charge.
Negative
Positive
Neutral
New
If an ionic compound contains a transition metal, Roman numerals are used to determine the _____.
amount of chloride
charge on the ion
order of appearance
version of the ion
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 atoms of that element in the compound.
The number of valence electrons in the element.
The number of different elements in the compound.
How many valence electrons are in a carbon dioxide (CO2) molecule?
8
12
24
16
Which of the following is an example of an ionic compound?
CO2
O3
Na
NaCl
If a polyatomic ionic compound has gained two hydrogen ions, such as H2 PO4 -. How does its name begin?
Hydrogen (II)
Dihydrogen
Hydrogen
Hydrous
Which of the following is true of intermolecular forces?
The forces that exist between molecules.
The strongest force in chemistry.
The force that bonds hydrogen with oxygen.
The forces that exist within a molecule.
In larger atoms, why can outer electrons move more freely?
Electrons are in higher energy shells, less tightly held.
Larger atoms have more electrons, atom less stable
atoms have more protons, which means more electron moves
no answer
A hydrogen bond is _____.
an intramolecular force
a perimolecular force
an intermolecular force
a paramolecular force
In chemistry, the Greek letter delta:
Signifies an ionic bond between atoms.
Designates partial charges
Indicates that a bond will not occur between atoms.
Tells you what Greek organization you belong to.
Why must we consider a molecule's shape when determining its polarity?
The shape reveals more about distribution of charge.
A molecule may have different shapes depending its polarity
Non polar molecules have dipoles that do not cancel out
Symmetrical molecules are always non polar.
Why are metals shiny?
Because they have mobile protons.
Because they can be polished to a high gloss.
Because they absorb light photons.
Because they reflect light photons.
If a central atom of a molecule only has two electron domains, what is the bond angle associated with the molecule?
120o
90o
109.5o
180o
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.
When drawing Lewis dot structures, what should you do if you run out of electrons before all atoms are satisfied?
Leave it as it is.
Try double or triple bonds.
Add the missing electrons.
Make a resonance structure.
Which of the following best describes the term dipole moment?
A non polar molecule
When several atoms in a compound are electronegative
When electrons are unevenly distributed
Having more than four dipoles