Chemistry Test - Chapter 8
The complete balanced equation for the reaction between zinc hydroxide and acetic acid (CH₃COOH) is a. ZnOH +CH₃COOH → ZnCH₃COO + H₂O b. Zn(OH)₂+CH₃COOH→Zn + 2CO₂+ 3H₂O C. Zn(OH)₂+2CH₃COOH→Zn(CH₃COO)₂ +2H₂O d. Zn(OH)₂+2CH₃COOH→Zn(CH₃COO)₂ +H₂ +O₂
C. Zn(OH)₂+2CH₃COOH→Zn(CH₃COO)₂ +2H₂O
When a solid produced by a chemical reaction separates from the solution it is called a. a precipitate b. a reactant c. a molecule d. the mass of the product
a. a precipitate
To balance a chemical equation, it may necessary to adjust the.. a. coefficients b. subscripts c. formulas of the products d. number of products
a. coefficients
In what kind of reaction does a single compound produce two or more simpler substances? a. decomposition reaction b. synthesis reaction c. single-displacement reaction d. combustion reaction
a. decomposition reaction
In what kind of reaction does one element replace a similar element in a compound? a. displacement reaction b. combustion c. decomposition reaction d. ionic reaction
a. displacement reaction
The reaction represented by the equation Pb(NO₃)₂ +2KI →PbI₂ + 2KNO₃ is a a. double-displacement reaction b. synthesis reaction c. decomposition reaction d. combustion reaction
a. double-displacement reaction
The reaction represented by the equation 2Mg + O₂ → 2MgO is a a. synthesis reaction b. decomposition reaction c. single-displacement reaction d. double-displacement reaction
a. synthesis reaction
In a chemical reaction.. a. the mass of the reactants equals the mass of the products b. the mass of the products is greater than the mass of the reactants c. the number of atoms in the reactants and products must change d. energy as heat must be added to the reactants
a. the mass of the reactants equals the mass of the products
Which coefficients correctly balance the formula equation NH₄NO₂ → N₂ + H₂O? a. 1, 2, 2 b. 1, 1, 2 c. 2, 1, 1 d. 2, 2, 2
b. 1, 1, 2
In the word equation, sodium oxide + water → sodium hydroxide, the formula for sodium hydroxide is represented by.. a. Na₂OH b. NaOH c. NaO₂ d. Na₂O
b. NaOH
After the first steps in writing an equation, the equation is balanced by a. adjusting subscripts to the formula(s) b. adjusting coefficients to the smallest whole number ratio c. changing the products formed d. making the number of reactants equal to the number of products
b. adjusting coefficients to the smallest whole number ratio
The reaction represented by the equation 2KClO₃ → 2KCl + 3O₂ is a(n) a. synthesis reaction b. decomposition reaction c. compound reaction d. ionic reaction
b. decomposition reaction
The equation AX → A +X is the general equation for a a. synthesis reaction b. decompostition reaction c. combustion reaction d. single-displacement reaction
b. decompostition reaction
In what kind of reaction of the ions of 2 compounds exchange places in aqueous solution to form 2 new compounds? a. synthesis reaction b. double-displacement reaction c. decomposition reaction d. combustion reaction
b. double-displacement reaction
Which word equation represents the reaction that produces water from hydrogen and oxygen? a. Water is produced from hydrogen and oxygen b. hydrogen plus oxygen yields water c. H₂ + O₂ → water d. Water can be separated into hydrogen and oxygen
b. hydrogen plus oxygen yields water
A chemical equation is balanced when the.. a. coefficients of the reactants equal the coefficients of the products b. same number of each kind of atom appears in the reactants and in the products c. products and reactants are the same chemicals d. subscripts of the reactants equal the subscripts of the products
b. same number of each kind of atom appears in the reactants and in the products
In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is a. H b. 2H c. H₂ d. OH
c. H₂
How would oxygen be represented in the formula equation for the reaction of methane and oxygen to yield carbon dioxide and water? a. oxygen b. O c. O₂ d. O₃
c. O₂
The equation A + BX → AX + B is the general equation for a a. double-displacement reaction b. decomposition reaction c. single-displacement reaction d. combustion reaction
c. single-displacement reaction
The reaction represented by the equation Cl₂ + 2KBr → 2KCl + Br₂ is a(n) a. synthesis reaction b. decomposition reaction c. single-displacement reaction d. combustion reaction
c. single-displacement reaction
The reaction represented by the equation Mg + 2HCl → H₂ + MgCl₂ a. composition reaction b. decomposition reaction c. single-displacement reaction d. double-displacement reaction
c. single-displacement reaction
The equation A + X → AX is the general equation for a(n) a. combustion reaction b. ionic reaction c. synthesis reaction d. double-displacement reaction
c. synthesis reaction
Which coefficients correctly balance the formula equation CaO + H₂O → Ca(OH)₂? a. 2,1,2 b. 1,2,3 c. 1,2,1 d. 1,1,1
d. 1,1,1
Which equation is NOT balanced? a. 2H₂ +O₂ → 2H₂O b. 4H₂ +2O₂ → 4H₂O c. H₂ + H₂ + O₂ → H₂O + H₂O d. 2H₂ + O₂ → H₂O
d. 2H₂ + O₂ → H₂O
When the equation Fe₃O₄ + Al → Al₂O₃ + Fe is correctly balanced, what is the coefficient of Fe? a. 3 b. 4 c. 6 d. 9
d. 9
What is the small whole number that appears in front of a formula in a chemical equation? a. a subscript b. a superscript c. a ratio d. a coefficient
d. a coefficient
According to the law of conservation of mass, the total mass of the reacting substances is.. a. always more than the total mass of the products b. always less than the total mass of the products c. sometimes more and sometimes less than the total mass of the products d. always equal to the total mass of the products
d. always equal to the total mass of the products
The reaction represented by the equation 2HgO → 2Hg + O₂ is a(n) a. single-displacement reaction b. synthesis reaction c. combustion reaction d. decomposition reaction
d. decomposition reaction
The equation AX + BY → AY + BX is the general equation for a a. synthesis reaction b. decomposition reaction c. single-displacement reaction d. double-displacement reaction
d. double-displacement reaction
In what kind of reaction do 2 or more substances combine to form a new compound? a. decomposition reaction b. ionic reaction c. double-displacement reaction d. synthesis reaction
d. synthesis reaction