WorksheetsPS Unit 2 Test
Total questions: 40
Worksheet time: 21mins
Which of the following groups contains 3 elements with stable electron configurations?
lithium, krypton, argon
argon, neon, barium
xenon, neon, boron
helium, xenon, neon
The formation of an ionic bond involves the...
transfer of electrons
transfer of neutrons
transfer of protons
sharing of electrons
When 2 atoms of the same nonmetal react, they often form a(n)...
ionic bond
polyatomic ion
diatomic molecule
polar molecule
Lithium (Li) forms a binary ionic compound with Fluoride (Fl). What is the name of this compound?
fluorine lithide
lithium fluoride
lithium fluorine
fluorine lithium
Sodium (Na) has how many valence electrons?
1
2
6
7
Chlorine has how many valence electrons?
1
2
7
8
Covalent bonds form between:
two nonmetals
two metals
a metal and a nonmetal
two alkali metals
A metal and a noble gas
The bond formed by the attraction between a metal cation and the shared electrons that surround it.
ionic bond
covalent bond
metallic bond
isotope bond
A mixture of two or more elements, at least one of which is a metal.
metalloid
alkali metal
alkaline earth metal
alloy
Metallic bonds form between
metals and nonmetals
two nonmetals
two metals
only transition metals
Many nonmetals exist as diatomic molecules. The word "diatomic" means two
atoms
molecules
ions
bonds
What kind of bond do two nonmetals form?
ionic
covalent
nuclear
metallic
An atom forms an ion by gaining or losing _____.
protons
neutrons
electrons
anions
The substances that undergo change in a chemical reaction are called
coefficients
catalysts
products
Which of the following is a balanced chemical equation for the synthesis of NaBr from Na and Br2?
Na + Br2 --> NaBr
2Na + Br2 --> NaBr
Na + Br2 --> 2NaBr
2Na + Br2 --> 2NaBr
A _____ is the number that appears before a formula in a chemical equation.
subscript
atomic number
mole
In a compound, chemical energy is contained in the
nuclei of the atoms
unbonded electrons
bonds
movement of the electrons
AB ---> A + B
synthesis
single replacement
decomposition
double replacement
A + BC ---> B + AC
synthesis
single replacement
decomposition
double replacement
AB + CD ---> AD + CB
synthesis
single replacement
decomposition
double replacement
Energy stored in the chemical bonds of a substance is called _____ energy.
ionization
covalent
coefficient
A chemical reaction that releases energy to its surroundings is called an _____ reaction.
endothermic
redox
ionic
A chemical reaction that absorbs energy from its surroundings is called an _____ reaction.
exothermic
single replacement
synthesis
C3H8 + 5O2 ---> 3CO2 + 4H2O + heat
endothermic reaction
exothermic reaction
A _____ is the rate at which reactants change into products over time.
catalyst rate
molar mass
atomic rate
An increase in surface area will _____ the reaction rate.
increase
decrease
not affect
Stirring the reactants will generally _____ the reaction rate.
increase
decrease
not affect
Chemical reactions involve collisions between particles of reactants. If these collisions occur more frequently, then the reaction rate will _____.
increase
decrease
not change
Which of the following does NOT affect the reaction rate of chemical reactions?
temperature
surface area
stirring
size of container
In a chemical reaction that is at equilibrium, which of the following is true?
All of the reactants have been converted to products.
The reaction stops even though some reactants remain.
Forward and reverse reactions occur at the same rate.
All of the products are gases.
A _____ reaction is a reaction in which the conversion of reactants into products and the conversion of products into reactants can happen simultaneously.
reversible
chemical
exothermic
single replacement
When a change is introduced to a system in equilibrium, the equilibrium shifts in the direction that relieves the change.
true
false
According to Le Châtelier’s principle, if you increased the pressure, the equilibrium would shift in the direction that _____the pressure of the system.
increases
decreases
doesn't change
In the following equation, which are the reactants?
NaHCO3 + HCl ---> NaCl + H2O + CO2
NaHCO3 and HCl
NaHCO3 and NaCl
HCl and NaCl
NaCl, H2O, and CO2
Which of the following is a statement of the law of conservation of mass?
mass is created but not destroyed
mass is destroyed but not created
mass is neither created nor destroyed
mass is both created and destroyed
The big/regular sized numbers in a chemical formula:
(the RED numbers)
Subscripts
Coefficients
Numbers
Molecules
Identify if the following equation is unbalanced or balanced.
4K+P3→3KP+K
Unbalanced
Balanced
Chemical reactions involve the _____ of chemical bonds in the reactants, and the _____ of chemical bonds in the products.
breaking, formation
formation, breaking
gaining, losing
losing, gaining
