Chapter 11 Test Questions

Which of the following is TRUE regarding a precipitation reaction. A) Both products must be soluble in water B) At least one of the products will be insoluble in water C) Spectator ions are always included in the reaction D) Electrons are gained and lost E) H+ ions are transferred from one molecule to another

A) Both products must be soluble in water

Which of the following ions will NEVER form a precipitate? A) K+ B) Ca2+ C) CO32- D) SO42- E) Pb2+

A) K+

Which of the following is NOT true concerning the decomposition of a simple binary compound? A) The products are unpredictable. B) The products are the constituent elements. C) The reactant is a single substance. D) The reactant could be an ionic or a molecular compound. E) Energy is usually required.

A) The products are unpredictable.

Which of the following is NOT a true statement concerning what happens in all chemical reactions? A) The ways in which atoms are joined together are changed. B) New atoms are formed as products. C) The starting materials are named reactants. D) The bonds of the reactants are broken and new bonds of the products are formed. E) In a word equation representing a chemical reaction, the reactants are written on the left and the products on the right.

A) The ways in which atoms are joined together are changed.

In every balanced equation, each side of the equation has the same number of_____.

Atoms

Combining aqueous solutions of BaI2 and Na2SO4 affords a precipitate of BaSO4. Which ion(s) is/are spectator ions in the reaction? A) Ba2+ only B) Na+ only C) Ba2+ and SO42- D) Na+ and I- E) SO42- and I-

B) Na+ only

Symbols used in equations, together with the explanations of the symbols, are shown below. Which set is correct? A) (g), grams B) (l), liters C) (aq), dissolved in water D) (sp), solid product E) (lq), liquid

C) (aq), dissolved in water

A skeleton equation does NOT show which of the following? A) the correct formulas of the reactants and products B) the reactants on the left, the products on the right C) an arrow connecting the reactants to the products D) the physical states of the substances E) the relative amounts of reactants and products

E) the relative amounts of reactants and products

Chemical reactions____.

Produce new substances

A catalyst is____.

a chemical that speeds up the reaction

Chemical equations describe _____.

chemical reactions

Chemical equations____.

describe chemical reactions

complete ionic equation

for a chemical reaction written to show the predominant form of all species in aqueous solution or in contact with water.

What does the symbol Δ in a chemical equation mean?

heat is supplied to the reaction

balanced equation

in which each side of the equation has the same number of atoms of each element and mass is conserved

decomposition reaction

is a chemical change in which a single compound breaks down into two or more simpler products.

combination reaction

is a chemical change in which an element or a compound reacts with oxygen.

single replacement reaction

is a chemical change in which one element replaces a second element in a compound.

combustion reaction

is a chemical change in which two or more substances react to form a single new substance.

double replacement reaction

is a chemical change involving an exchange of positive ions between two compounds.

skeleton equation

is a chemical equation that does not indicate the relative amounts of the reactants and products

chemical equation

is a representation of a chemical reaction; the formulas of the reactants (on the left) are connected by an arrow with the formulas of the products (on the right)

catalyst

is a substance that speeds up the reaction but is not used up in the reaction

spectator ion

is an ion that exists in the same form on both the reactant and product sides of a chemical reaction.

net ionic equation

is the ability to recognize monoatomic and polyatomic ions, and the solubility rules.

Chemical equations must be balanced to satisfy the

law of conservation of mass

coefficient

small whole numbers that are placed in front of the formulas in an equation in order to balance it.

The double arrow symbol indicates____.

that the reaction is reversible