WorksheetsChapter 8 Chemical Equations and Reactions Review
Total questions: 25
Worksheet time: 20mins
After the correct formula for a reactant in an equation has been written, the—
chemical formula cannot be altered
subscripts of the formula are changed to balance the equation
chemical symbols in the formula must appear only on the reactant side
same chemical formula must be written on the product side of the equation
Which equation represents a precipitation reaction?
H2CO3 (aq) --> CO2 (g) + H2O (l)
H2SO4 (aq) + 2NaOH (aq) --> Na2SO4 (aq) + 2H2O (l)
2H2 (g) + O2 (g) --> 2H2O(l)
AgNO3 (aq) + NaOH (aq) --> AgOH (s) + NaNO3(aq)
Which of the following reactions involves two or more substances combining to form a single compound?
Single-replacement reaction
Synthesis reaction
Decomposition reaction
Combustion reaction
Which of the following reactions involves one element replacing an element in a compound that is from the same activity series?
Combustion reaction
Decomposition reaction
Single-replacement reaction
Double-replacement reaction
Which of the following reactions involves the ions of two compounds exchanging places to form two new compounds?
Synthesis reaction
Single-replacement reaction
Double-replacement reaction
Combustion reaction
Which of the following reactions involves a single compound producing two or more simpler substances?
Synthesis reaction
Decomposition reaction
Combustion reaction
Double-replacement reaction
By predicting the outcome of the following reactants mixing together in an aqueous solution, what type of reaction will take place?
Pb(NO3)2 (aq) + 2 KI (aq) →
Double-replacement reaction
Synthesis reaction
Decomposition reaction
Single-replacement reaction
When an acid, such as carbonic acid, decomposes, the products are —
non-metal oxides and a salt
non-metal oxides and water
metal oxides and oxygen
metal oxides and peroxide
Predict the outcome of the reaction where zinc metal is added to a solution of potassium chloride.
No reaction occurs.
Gaseous zinc is formed.
Potassium calcide forms.
Zinc chloride forms.
Predict the products of the following reaction:
Na2O + CO2 →
Na2CO3
Na + CO3
NaCO2 + O2
NaC + O3
Which coefficients are required to correctly balance the equation,
C2H2 + O2 → CO2 + H2O?
1, 2, 3, 2
2, 5, 4, 2
2, 4, 5, 2
2, 3, 5, 2
According to the law of conservation of matter, the total mass of all the reacting substance is—
more than the mass of all the products
more than the total mass of all the products and the reactants
less than the total mass of all the products
equal to the mass of all the products
What are the coefficients that would correctly balance this reaction?
____Ni + ____C4H8N2O2 → ____Ni(C4H8N2O2)2
1, 2, 1
2, 2, 1
2, 1, 1
2, 2, 2
What is the balanced equation for the combustion of magnesium?
Mg (s) + O2 (g) → MgO (g)
Mg (s) + O2 (g) → MgO2 (g)
2 Mg (s) + O2 (g) → 2 MgO (s)
Mg (s) + 2 O2 (g) → MgO42- (aq)
A student performing an investigation of chemical reactions mixes two aqueous solutions and observes a change in color. Color change is most indicative of which type of chemical reaction?
Neutralization
Precipitation
Oxidation-reduction
Acid-base
What are the coefficients that would correctly balance this equation?
____Zn + ____K2CrO4 → ____K + ____ZnCrO4
2, 1, 2, 1
1, 2, 3, 1
1, 2, 1, 2
1, 1, 2, 1
A student observes what happens when two different aqueous solutions are mixed in a test tube. Which of the following observations would be most indicative of a precipitation reaction?
Gas bubbles are produced.
A solid settles out.
There is a color change.
The test tube warms.
Which equation represents a neutralization reaction?
H2CO3 (aq) → CO2 (g) + H2O (l)
H2SO4 (aq) + 2NaOH (aq) → Na2SO4 (aq) + 2H2O (l)
2H2 (g) + O2 (g) → 2H2O (l)
AgNO3 (aq) + NaOH (aq) → AgOH (s) + NaNO3 (aq)
Tetraethyl lead, Pb(C2H5)4, burns in air to produce solid lead(II) oxide, carbon dioxide gas, and water vapor. Which reaction best expresses this combustion reaction?
2 Pb(C2H5)4(s) + 27 O2(g) --> 2 PbO(s) + 16 CO2(g) +
20 H2O(g)
2 Pb(C2H5)4(s) + 13 O2(g) --> 2 PbO(s) + 16 CO2(g) +
20 H2O(l)
Pb(C2H5)4(s) + 27 O2(g) --> PbO(s) + 7 CO2(g) + 20 H2O(g)
Pb(C2H5)4(s) + 13 O2(g) --> PbO(s) + 7 CO2(g) + 20 H2O(l)
Which additional product balances the equation for the reaction between zinc metal and hydrochloric acid?
Zn(s) + 2HCl(aq) → H2(g) + ____
Zn2HCl
ZnCl2
2 ZnH
2 ZnH2Cl2
KClO3 --> KCl + O2
