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WorksheetsChemical Reactions
Total questions: 30
Worksheet time: 22mins
In the equation: 2Mg + O2 -> 2MgO, which are the reactants
Mg and O2
MgO
Mg and MgO
O2 and MgO
Balance the equation, Ca + H2O -> CaO + H2
Ca + 2H2O -> CaO + 2H2
2Ca + H2O -> CaO + H2
it is balanced as is
can not be balanced
what is a coefficient?
the small number on the right of the chemical symbol
the large number to the left of a formula
What coefficients are needed to correctly balance the equation?
_Bi + _O2 -> _ Bi2O3
3, 2, 3
2, 3, 2
4, 3, 2
none of these
Why must chemical equations be balanced?
so the equation doesn't explode
the reaction won't occur until it is balanced
based on the Law of Conservation of Matter, matter cannot be created or destroyed
based on the Law of Conservation of Energy, energy can not be created or destroyed.
A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
coefficient
reactant
subscript
product
2Ca + O2 -> 2CaO
What is the 2 located behind oxygen called?
coefficient
reactant
subscript
product
Evidence of a chemical reaction include:
phase changes (example: solid to liquid)
no new substance
bubbles forming
shape change
2HI -> H2 + I2
synthesis
decomposition
single replacement
double replacement
combustion
C + O2 -> CO2
acid base
combustion
decomposition
single replacement
synthesis
Zn + H2S -> ZnS + H2
synthesis
combustion
single replacement
decomposition
double replacement
Fe + O2 -> Fe2O3
synthesis
acid base
single replacement
decomposition
combustion
What are the products of this reaction?
Cu + AgNO3 ->
Cu(NO3)2 + Ag
CuNO3 + Ag
CuAg + NO3
Cu + AgNO3
No Reaction
What are the product of this reaction?
Zn (s) + H2SO4 (aq) ->
Zn(SO4)2 + H
Zn(SO4)2 + H2
ZnSO4 + H2
Zn2SO4 + H2
no reaction
What are the products of this reaction?
NaOH + Fe(NO3)3 ->
NaFe
NaNO3 + Fe(OH)3
NaNO3 + FeOH
No reaction
Write the balanced products for this reaction:
C2H4 + 3 O2 ->
C2O2 + H4
CO2 + HOH
CO + H
2CO2 + 2H2O
the symbol for a substance dissolved in water is...
(s)
(l)
(g)
(aq)
Predict the products for this reaction
K + HCl ->
KCl + H2
KHCl
KH + Cl2
KCl + H
No reaction
NH4NO3
soluble
insoluble
AgCl
soluble
insoluble
FeS
soluble
insoluble
Ca(OH)2
soluble
insoluble
What is the precipitate formed when you mix silver nitrate and copper II chloride?
copper II nitrate
copper II chloride
silver chloride
silver nitrate
no ppt (no reaction)
What is the name of the precipitate formed in the reaction of calcium sulfide and aluminum nitrate
calcium nitrate
aluminum sulfide
aluminum nirtate
calcium sulfide
no ppt (no reaction)
Which substance is insoluble in water?
MgS
BI3
Sr(OH)2
MgO
What are the spectator ions in the reaction of sodium chloride with silver nitrate?
silver and nitrate
sodium and chlorine
sodium and nitrate
silver and chlorine
n/a (no reaction)
Which pair could be spectator ions?
NH4+1 and Cl-1
Ca+2 and OH-1
Ag+1 and Br-1
Sr+2 and CO3-2
What are the spectator ions in this reaction?
CuCl2(aq) + NaOH(aq) -> Cu(OH)2(s) + NaCl(aq)
Cu+2 and OH-1
Na+1 and Cl-1
Na+1 and OH-1
Cu+2 and Cl-1
What is the type of energy required with a collision to form a bond?
Law of Conservation of Mass
Coefficient
Surface Area
Activation Energy
Which of the following is NOT a way to speed up a reaction?
crush the substance to increase surface area
cool off the substance to slow molecule movement
increase pressure to push on the molecules and force them closer together
increase the number of atoms reacting by increasing the concentration
