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WorksheetsChemical Equation Re-Quest
Total questions: 20
Worksheet time: 1hrs 4mins
A balanced chemical equation is used to represent the
law of conservation of reactions
law of conservation of matter
law of conservation of energy
law of conservation of inertia
Each substance to the left of the arrow in a chemical equation is a(n):
element
compound
reactant
product
In a chemical equation the symbol that means yields is the
equal sign
coefficient
plus sign
arrow
In a chemical equation, a triangle written above the arrow means that
a catalyst must be added
heat must be added
the product must be refrigerated
a precipitate will form
In a chemical equation, the symbol that is used to separate 2 reactants or 2 products is the
arrow
reversible arrow
plus sign
slash
When a lower case aq, (aq), is written beside a substance in an chemical equation it indicates that the substance is
a liquid
a precipitate in water
dissolved in water
gaseous
In a chemical reaction, a catalyst
is one of the reactants
speeds up the chemical reaction without actually combining with the reactants
dissolves chemicals that water is unable to
slows down the reaction
In a chemical equation, an upward arrow indicates
a precipitate was formed
a gas was released
heat and light were given off
a catalyst was used
Which observation does NOT indicate that a chemical reaction has occurred?
formation of a precipitate
production of a gas
evolution of heat and light
change in volume
Which equation describes a single-replacement reaction?
Ba(OH)2 + 2HCl → BaCl2 + 2H2O
CH4 + 2O2 → CO2 + 2H2O
Zn + CuSO4 → Cu + ZnSO4
2Na + Cl2 → 2NaCl
The following equation is an example of what type of reaction?
6KNO3 + Al2(SO4)3 → Al(NO3)3 + K2SO4
synthesis
decomposition
single replacement
double replacement
Which of the following is an example of a decomposition reaction?
2Al + 3Cl2 → 2AlCl3
CH4 + 2O2 → CO2 + 2H2O
2ZnS + 3O2 → 2ZnO + 2SO2
NH4NO2 → N2 + 2H2O
In the combustion reaction of propane, C3H8, what are the products?
C3H8 and O2
O2 and H2O
C3H8 and CO2
CO2 and H2O
The following equation is an example of what type of reaction?
Fe + O2 → Fe2O3
combustion
synthesis
single replacement
decomposition
Why must we balance chemical equations?
our teacher said so
to represent the law of conservation of energy
to represent the law of conservation of matter
to represent the law of conservation of reactions
To balance a chemical equation, it may be necessary to adjust the
subscripts
superscripts
coefficients
chemical formula
Calculate the number of atoms for each element in the substance KClO3
K = 1 Cl = 3 O = 3
K = 3 Cl = 3 O = 3
K = 1 Cl = 1 O = 3
K = 1 C = 1 l = 1 O = 3
Calculate the number of atoms for each element in the substance Mg(NO3)2
Mg = 1 N = 2 O = 6
Mg = 1 N = 4 O = 6
Mg = 1 N = 8 O = 24
Mg = 2 N = 2 O = 6
Which of the following chemical equations is balanced?
3MgO + 2H3PO4 → Mg3(PO4)2 + 3H2O
3MgO + 2H3PO4 → Mg3(PO4)2 + 2H2O
6MgO + 4H3PO4 → 2Mg3(PO4)2 + 3H2O
6MgO + 2H3PO4 → 2Mg3(PO4)2 + 6H2O
In the equation
2Al(s) + 3PbNO3)2(aq) → 3Pb(s) + 2Al(NO3)3(aq)
what does the aluminum replace?
nitrate
water
lead
nitrogen
