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Duplicate of Chemistry - 11 -Chemical Reactions Flashcards | StudBud
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Duplicate of Chemistry - 11 -Chemical Reactions
Duplicate of Chemistry - 11 -Chemical Reactions
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Questions for a High School Chemistry College Prep class
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Questions
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Answers
1
A skeleton equation does not show which of the following?
reactants on left, products on right
the relative amounts of reactants and products
correct formulas of the reactants and products
an arrow connecting reactants and products
2
The equation H
2
CO
3
+ Ca(OH)
2
--> CaCO
3
+ 2H
2
O is an example of a ...
combustion reaction
single-replacement reaction
combination reaction
double-replacement reaction
3
Correct skeleton equation: magnesium metal reacts with oxygen gas to form magnesium oxide
Mg(s) + O(g) --> MgO(s)
Mg(s) + O2(g) --> MgO2(s)
Mg(s) + 2O(g) --> MgO2(s)
Mg(s) + O2(g) --> MgO(s)
4
One of the products when aqueous lead (IV) bromide reacts with aqueous sodium hydroxide is
NaBr2
Pb(OH)4
NaPb
Pb(OH)2
5
What is the balanced chemical equation when fluorine and sodium bromide react?
F + NaBr --> NaF + Br
F2 + 2NaBr --> 2NaF + Br2
F2 + NaBr --> NaF + Br2
F2 + NaBr --> NaF2Br
6
Coefficient and symbol for fluorine in reaction: nitrogen trifluoride --> nitrogen + fluorine
F3
6F
3F2
6F2
7
What is the balanced net ionic equation for: H
3
PO
4(aq)
+ Mg(OH)
2(aq)
--> Mg
3
(PO
4
)
2(aq)
+ H
2
O
(l)
H+ + OH- --> H2O
3H+ + 2OH- --> H2O
3H+ + 3OH- --> 3H2O
3Mg2+ + 2PO43- --> Mg3(PO4)2
8
Which set of symbols used in equations and its explanation is correct?
(aq) dissolved in water
(l) liters
(g) grams
(s) sodium
9
Which is the balanced chemical reaction for the decomposition of iron (III) oxide?
2Fe2O3(s) --> 4Fe(s) + 3O2(g)
2Fe2O3(s) --> 2Fe(s) + 3O2(g)
Fe2O3(s) --> Fe(s) + 3O(g)
FeO(s) --> Fe(s) + O(g)
10
In a double-replacement reaction what is
NOT
one of the possible products?
an acid
water
a precipitate
a gas
11
Chemical equations must be balanced to satisfy:
the law of multiple proportions
law of conservation of mass
Avogadro's principle
the law of definite proportions
12
Coefficients to balance this skeleton equation: Ca(OH)
2
+ H
3
PO
4
--> Ca
3
(PO
4
)
2
+ H
2
O
3,3,1,3
1,1,3,3
3,2,1,6
3,1,2,3
13
What does
NOT
happen in all chemical reactions?
The ways in which atoms are joined together are changed
The starting substances are called reactants
Bonds in reactants are broken and new bonds are formed
New atoms are formed as products
14
Use the activity series of metals to complete a balanced equation for: Ag
(s)
+ KNO
3(aq)
-->
NO reaction as Ag is less reactive than K
AgK + NO3
AgKNO3
AgNO3 + K
15
In a double-replacement reaction, what happens?
the reactants are usually a metal and a nonmetal
One of the reactants is often water
energy in the form of heat or light is produced
the reactants are 2 ionic compounds in aqueous solution
16
What must be true for this reaction to take place? Ca
(s)
+ 2AgNO
3(aq)
--> Ca(NO
3
)
2(aq)
+ 2Ag
(s)
Ca must be above Ag on the activity series
Heat must be supplied to the reaction
A precipitate must form
Ag must be above Ca on the activity series
17
In a combustion reaction, one of the reactants is always:
a gas
water
oxygen
a precipitate
18
The correct coefficients and formulas for the products of CsOH + H
2
SO
4
.
Cs(SO4)2 + 2H2O
Cs(SO4)2 + H2O
CsSO4 + H2O
H2Cs + HOSO4
19
The reaction Pb + 2Cl
2
--> PbCl
4
is an example of a
combination (synthesis) reaction
decomposition reaction
single-replacement reaction
combustion reaction
20
The complete combustion of which of the following produces only carbon dioxide and water?
Na2CO3
C8H18
NO2
NaHCO3
