Chem Chapter 8

which of the following is a formula equation for the formation of carbon dioxide from carbon and oxygen? a. carbon plus oxygen yield carbon dioxide b. C + O2 --> CO2 c. CO2 ---> C + O2 d. 2C + O ---> CO2

C + O2 --> CO2

in an equation the symbol for a substance dissolved in a water solution is followed by a. (l) b. (g) c. (aq) d. (s)

(aq)

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

1,1,1

which coeffiecients correctly balance the formula equaation NH4NO2 --> N2(g) + H2) a. 1,2,2 b. 1,12 c.2,1,1 d.2,2,2

1,1,2

what is the balanced equation when aluminum reacts with copper (II) sulfate a. Al + Cu2S ---> Al2S + Cu b. 2Al + 3CuSO4 --> Al2(SO4)3 + 3Cu c. Al + CuSO4 --> AlSO4 + Cu d. 2Al + Cu2SO4 --> Al2SO4 + 2Cu

2Al + 3CuSO4 --> Al2(SO4)3 + 3Cu

when the equation Fe3O4+Al-->Al2O3+Fe is correctly balanced what is the coefficient of Fe? a. 3 b. 4 c. 6 d. 9

9

how would oxygen be represent 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

O2

a chemical formula written over the arrow in a chemical equation signifies a. byproduct b. the formation of a gas c. a catalyst for the reaction d. an impurity

a catalyst for the reaction

in the chemical equation 2AlCl3(aq) + 3Pb(NO3)2(aq) --> 3PbCl2(s) + 2Al(NO3)3 (aq), PbCl2 is a. soluble in water b. sublimated c. a sspectator d. a solid

a solid

the complete balanced double-displacement equation for reaction between zine (II) hydroxide and acetic acid 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 + H2O

c

what is the balanced equation for the combustion of sulfur a. S(s) + O2(g) --> SO(g) b. S8(s) + O2(g) --> SO(g) c. S8(s) + O2(g) --> 8SO2(g) d. S(s) + O2(g) --> SO4(^-2) (aq)

c

which equation is not balanced? a. 2H2 + O2 --> 2h2O b. 4H2 + 2O2 --> 4H2O c. H2 + H2 + O2 --> H2O + H2O d. 2H2 + O2 ---> H2O

d

in what kind of reaction does a single compound produce two or more simpler substances a. decomposition reaction b. synthesis reaction reaction c. displacement reaction d. ionic reaction

decomposition reaction

the equation AX --> A + X is the general equation for a. synthesis reaction b. decomposition reaction c. displacement reaction d. combustion reaction

decomposition reaction

the reaction 2HgO2(s) --> 2Hg(l) + O2(g) is an a. displacement reaction b. synthesis reaction c. ionic reaction d. decomposition reaction

decomposition reaction

the reaction 2KClO3(s) --> 2KCl)(s) + 3O2(s) is a a. synthesis reaction b. decomposition reaction c. combustion reaction d. ionic combustion

decomposition reaction

in what kind of reaction does one element replace a similar element in a compound? a. displacement reaction b. double-displacement reaction c. decomposition reaction d. ionic reaction

displacement reaction

the equation A + BX --> AX + B is the general equation for a. double displacement reaction b. decomposition reaction c. displacement reaction d. combustion reaction

displacement reaction

the reaction Cl2(g) + 2KBr(aq) --> @KCl(aq) +Br2(l) isi a a. synthesis reaction b. ionic reaction c. displacement reaction d. combustion reaction

displacement reaction

the reaction Mg(s) + 2HCl(aq) --> H2(g) + MgCl2(aq) is a a. composition reaction b. decomposition reaction c. displacement reaction d. double-displacement reaction

displacement reaction

the equation AX + BY --> AY + BX is general equation for a. synthesis reaction b. decomposition reaction c. displacement reaction d. double displacement reaction

double displacement reaction

in what kind of reaction do the ions of two compounds exchange places in aqueous solutions to form new compounds a. synthesis reaction b. double-displacement reaction c. decomposition reaction d. displacement reaction

double-displacement reaction

the reaction Pb(NO3)2(aq) --> PbI2(s) + 2KNO3(aq) is a a. double-displacement reaction b. synthesis reaction c. decomposition reaction d. combustion reaction

double-displacement reaction

a solid produced by a chemical reaction is a chemical reaction because a. precipitate b. a reactant c. a molecule d. the mass of the product

precipitate

in what kind of reaction do two or more substances combine to form a single new compound? a. decomposition reaction b. ionic reaction c. double-displacement reaction d. synthesis reaction

synthesis reaction

the equation A + X --> AX is the general equation for a a. combustion reaction b. ionic reaction c. synthesis reaction d. double displacement reaction

synthesis reaction

the reaction 2Mg(s) + O2(g) --> 2MgO(s) isa a. synthesis reaction b. decomposition reaction c. displacement reaction d. double-displacement reaction

synthesis reaction

C(s) + O2(g) --> CO2(g) + energy is a chemical reaction because a. it releases energy b. the chemical properties of CO2 are different from the reactants properties c. it absorbs energy d. CO2 is a gas and carbon is a crystal

the chemical properties of CO2 are different from the reactants properties

in writing an equation for a reaction that produces hydrogen gas, the correct representation of hydrogen gas is a. H b.. 2H c. H2- d. O3

H2-

after the first steps in writing an equation, the subscripts of the products a. adjusting subscripts to the formula 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

adjusting coefficients to the smallest whole-number ratio

accoding 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

always equal to the total mass of the products

which observation does NOT indicate that a chemical reaction has occurred? a. formation of a precipitate b. production of a gas c. evolution of heat and light d. change in total mass of substances

change in total mass of substances

to balance a chemical equation, it may be necessary to adjust the a. coefficients b. subscripts c. formulas of the products d. number of products

coefficients

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

same number of each kind of atom appears in the reactants and in the products

when balancing a chemical equation, insert coefficients to a. make atoms of all elements equal to the same number b. change the oxidation number c. correct a chemical formula d. satisfy the law of conservation

satisfy the law of conservation

in the chemical reaction 2Cr(s) + 3O2(g) --> 2CrO3(s), two chromium atoms combine with ________________ oxygen atoms a. three b. six c. five d. nine

six

when sodium chlorate NaClO3 decomposes the products are a. sodium hydroxide and water b. sodium oxide and chlorine c. sodium and chlorine oxide d. sodium chloride and oxygen

sodium chloride and oxygen

the state of matter for a reactant or product in a chemical equation is indicated by a a. coefficient before the formula b. subscript after the formula c. symbol after the formula d. superscript after the formula

symbol after the formula