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WorksheetsChemical Reactions
Total questions: 15
Worksheet time: 30mins
Name
Class
Date
1.
Precipitation reactions occur
a)
when group 1 cations are mixed with group 17 anions.
b)
when insoluble reactants are mixed.
c)
when soluble ionic reactants combine to form insoluble products.
d)
predominantly with halide salts.
2.
Which of the following ionic compounds is NOT soluble in water?
a)
PbI2
b)
AgNO3
c)
CaBr2
d)
K2CO3
3.
A chemical reaction has NOT occurred if the products have
a)
the same mass as the reactants.
b)
less total bond energy than the reactants.
c)
more total bond energy than the reactants.
d)
the same chemical properties as the reactants.
4.
After the correct formula for a reactant in an equation has been written, the
a)
subscripts are adjusted to balance the equation.
b)
formula should not be changed.
c)
same formula must appear as the product.
d)
A chemical reaction has NOT occurred if the products have
5.
The reaction 2HgO(s) → 2Hg(l) + O2(g) is a(n)
a)
single-replacement reaction.
b)
synthesis reaction.
c)
ionic reaction.
d)
decomposition reaction.
6.
In the equation 2Al(s) + 3Fe(NO3)2(aq) → 3Fe(s) + 2Al(NO3)3(aq), iron has been replaced by
a)
nitrate.
b)
water.
c)
aluminum.
d)
nitrogen.
7.
What is the probable product(s) of a double-replacement reaction?
a)
A new compound and the replaced metal
b)
A new compound and the replaced nonmetal
c)
Two different compounds
d)
A single compound
8.
In order for the reaction 2Al + 6HCl → 2AlCl3 + 3H2 to occur, which of the following must be true?
a)
Al must be above Cl on the activity series.
b)
Al must be above H on the activity series.
c)
Heat must be supplied for the reaction.
d)
A precipitate must be formed.
9.
When methanol undergoes complete combustion, the products are carbon dioxide and water. __ CH3OH(l) + __ O2(g) → __ CO2(g) + __ H2O(g) What are the respective coefficients when the equation is balanced with the smallest whole numbers?
a)
1, 1, 1, 1
b)
1, 2, 1, 2
c)
2, 2, 2, 4
d)
2, 3, 2, 4
10.
Chemical equations must be balanced to satisfy ____.
a)
the law of definite proportions
b)
the law of multiple proportions
c)
the law of conservation of mass
d)
Avogadro's principle
11.
To balance a chemical equation, you should change ONLY the...
a)
subscripts
b)
coefficients
c)
chemical formulas
d)
direction of the arrow
12.
Write a balanced equation for the reaction of aqueous solutions of potassium sulfide and hydrochloric acid.
a)
K2S(aq) + 2 HCl(aq) → 2 KH(aq) + SCl2(g)
b)
K2S(aq) + HCl(aq) → HS(g) + KCl(aq)
c)
K2S(aq) + 2 HCl(aq) → H2S(g) + 2 KCl(aq)
d)
K2S(aq) + 2 HCl(aq) → 2 K(s) + H2(g) + SCl2(g)
13.
Group 1 metals react with water to produce metal hydroxides and
a)
metal hydroxides
b)
hydrochloric acid
c)
oxygen
d)
hydrogen
14.
An insoluble gas that forms in a double-replacement reaction in aqueous solution
a)
bubbles out of solution.
b)
forms a precipitate.
c)
disassociates into ions.
d)
reacts with the water.
15.
A skeleton equation does NOT show which of the following?
a)
the correct formulas of the reactants and products
b)
the reactants on the left, the products on the right
c)
an arrow connecting the reactants to the products
d)
the relative amounts of reactants and products
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