ch 8

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 be 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. ionic 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

in a chemical reaction a. the mass of the reactants equals the mass of the products b. the mas of the products is greater than the mass of reactants c. the number of atoms d. energy as heat must be added to the reactants

a. the mass of the reactants equals the mass of the products

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

b. decomposition reaction

in what kind of reaction do the ions of two or compounds exchange places in aqueous solution to form to 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. H (sub) 2 + O (sub) 2 -> 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 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. subscrips 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. H (sub) 2 d. OH

c. H (sub) 2

how would oxygen be represented in te formula equation for the reaction of methane and oxygen to yield carbon dioxide and water a. oxygen b. O c. O (sub) 2 d. O (sub) 3

c. O (sub) 2

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 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

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 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

after the first steps in writing an equation, the equation is balanced by a. adjusting subscripts to the formulas 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

d. making the number of reactants equal to the number of products

in what kind of reaction do two 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