CHM 101- EXAM #2

decreases going down within a group
The ionization energy of atoms
What is the ionic charge of an ion with 13 protons and 10 electrons?
The molar mass of potassium is
The following reaction takes place when an electric current is passedthrough water. It is an example of a __________ reaction.

2H2O -> 2H2 + O2

the number of atoms of each element is the same in reactants and products
A chemical equation is balanced when
If the electronegativity difference between elements X and Y is 2.1, the bond between the elements X-Y is
decreases going across a period
The atomic size of atoms
the valence electrons
In an electron-dot structure of an element, the dots are used to represent
its group number
The number of valence electrons found in an atom of a Group A element is equal to
6.02 x 10^23
One mole of particles of any substance contains how many particles?
has a net charge of zero
An ionic compound
in the outermost energy level of an aatom
Valence electrons are electrons located
atoms lose, gain, or share valence electrons to have 8 valence electrons
The octet rule indicates that
In a __________ reaction, two or more elements or compounds form one product.
Which of the following elements does NOT exist as a diatomic molecule?
particles in one mole of a substance
Avogadro’s number is the number of
atoms are held together by sharing electrons
In a molecule with covalent bonding,
an exothermic reaction
What type of reaction is this?

CH4 + 2O2 -> CO2 + 2H2O + 218 kcal

covalent compounds
The types of compounds that use prefixes in their names are
single replacement
What is the classification for this unbalanced reaction?

Fe + HCl -> FeCl3 + H2

energy is absorbed by the system
In an endothermic reaction,
the number of electrons in each energy level
The electron arrangement of any particular atom shows
single covalent bonds do not give all of the atoms in one molecule eight valence electrons
Double and triple bonds form because
the energy needed to remove the least tightly bound electron
Ionization energy is
metals; cations
In ionic compounds, _________ lose their valence electrons to form positively charged ________.
2 moles Fe2O3
3 moles of O2
Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O2 to the number of moles of Fe2O3 produced?

4Fe + 3O2 -> 2Fe2O3

shape of a molecule
The VSEPR theory allows us to determine the most favorable
loss of electrons or gain of oxygen
Which of the following describes an oxidation reaction?
A(n) ____________ is the smallest neutral unit of two or more atoms held together by a covalent bond.
What is the greenhouse gas formed in combustion reactions?
bananas, orange juice, milk, potatoes
What are 3 good sources of K+ ions?

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