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WorksheetsPeriodic Table, Chemical Bonds, and Chemical Reactions
Total questions: 50
Worksheet time: 25mins
Mendeleev arranged the elements by
color
the number of neutrons
increasing atomic number
increasing atomic mass
Why don't noble gases normally form chemical bonds?
They have 2 valence electrons.
They have a full outermost energy level.
They have an empty outer level.
They have 8 protons.
Most metals are solid at room temperature except for ________________ which is a liquid.
bromine
aluminum
mercury
carbon
Elements whose atoms are radioactive are found in the
halogen group.
actinide group.
lanthanide group.
alkali metal group
What is the joining of atoms to form new substances?
chemical bonding
solution
joining chemicals
mixture
Periodic law states that
elements are either gases, solids, or liquids.
mercury is a liquid at room temerature.
properties of elements repeat periodically with the elements' atomic numbers
some elements only stay in a liquid state for short periods.
What is the source of activation energy that ignites a strike-anywhere match?
sunlight
friction
motion
heat
The solid substance that forms as a result of a chemical reaction in solution is ___________________.
a colloid
a precipitate
a solute
a suspension
Photosynthesis (6CO2 + 6H20 + light energy →C6H12O6 + 6O2) is an example of ___________________.
an exothermic reaction
respiration
an endothermic reaction
releasing energy
What can group numbers on the periodic table help you determine?
the number of valence electrons
the number of electrons
the number of protons
the number of neutrons
Why does the law of conservation of mass dictate that chemical equations be balanced?
because atoms are never gained or lost in a chemical reaction
because elements are classified by weight
because chemical formulas are written from left to right
because using the wrong chemical symbol causes confusion
Most of the elements to the right of the zigzag line on the periodic table are
nonmetals.
metals.
reactoids.
conductors.
What is true of the new substances formed in a chemical reaction?
properties differ from original substances
all substances have original properties
no substances have original properties
properties are the same as original substances
Which of the following increases the rate of a reaction?
decreasing the concentration of the reactants
adding an inhibitor
increasing the temperature of the reactants.
increasing the size of the reactants
Which of the following describes chlorophyll in leaves breaking down into new substances?
chemical substance
chemical reaction
chemical mixture
chemical solution
Which of these is a sign of a chemical reaction?
a solid precipitate
formation of gas
release of light or heat
all of the above
Which of the following is a property associated with metallic bonds?
brittleness
dullness
malleability
low electric conductivity
What happens in an exothermic reaction?
energy is destroyed
energy is released
energy is created
energy is taken in
How many carbon atoms are in this glucose molecule? C6H12O6
three
six
twelve
twenty-four
When substances in a closed system interact with one another, the total mass of the system
changes immediately.
remains the same.
escapes.
changes slowly.
What is the force that holds atoms together called?
a chemical solution
a chemical mixture
a chemical reaction
a chemical bond
Which states the law of conservation of energy?
In a chemical reaction, energy is neither created nor destroyed, but can change in form.
Energy is needed to break chemical bonds.
Light energy is released by some exothermic reactions.
An exothermic reaction releases energy.
What causes chemical bonds in molecules to break?
when molecules bump into each other with enough energy
when different substances are combined in a solution
when the temperature of a solution is lowered
when a substance changes state
If a chemical symbol in a chemical formula has no subscript, it means
the element is not present.
the element has no change.
the chemical is listed last in the formula
only one atom of the element is present.
Which of the following equations is balanced?
2Ag + S → Ag2S
SiO2 + 2C → Si + CO
Fe + O2 → Fe2O3
Al + O2 → Al2O3
The number beneath carbon indicates the
atomic number.
atomic mass.
chemical symbol.
element name.
In the electron-dot diagram shown, how many more electrons are needed for a filled outermost energy level?
0
1
2
3
Which of the following elements is a transition metal?
K
Kr
Cu
Ge
Which of these elements is a metalloid?
Ag
Na
Cl
Si
The element in the alkaline-earth metals group used to keep bones and teeth healthy __________________.
calcium
oxygen
carbon
sodium
There is a maximum of __________ electrons in the second atomic energy level.
eight
eighteen
two
one
The atomic number is equal to the number of __________________.
protons and neutrons
neutrons
atoms
protons
Electrons in the outermost energy level.
atomic mass
atomic number
valence electrons
orbital electrons
something that speeds up a chemical reaction
activation energy
kinetic energy
catalyst
inhibitor
the smallest amount of energy needed to start a chemical reaction
activation energy
catalyst
rate of reaction
inhibitor
the speed at which new particles form in a chemical reaction
activation energy
catalyst
rate of reaction
all of the above
something that slows a chemical reaction
catalyst
inhibitor
product
noble gas
metals so reactive that in nature they are found only combine with other elements
halogens
noble gases
transition metals
alkali metals
The most common metals are found here.
alkali metals
noble gases
transition metals
halogens
the nonmetal group that is the most unreactive
alkali metals
transition metals
noble gases
halogens
the most reactive nonmetal group
alkali metals
noble gases
halogens
transition metals
diamond is the hardest _______________ material
semiconductor
silicon
carbon
hydrogen
another name for metalloid
semiconductor
alkaline-earth metal
noble gas
halogen
the most abundant element in the universe
carbon
hydrogen
aluminum
silicon
when electrons are shared
covalent bonding
ionic bonding
semiconducting
nuclear episode
subscript
a
b
c
d
product/s
b
c
d
e
coefficient
a
b
c
e
reactant/s
a
b
d
e
The image above is the atomic structure for what element?
Sodium
Helium
Chlorine
Lithium
