CHEM - Chapter 11 Test

Consider the description: copper(II) oxide reacts with sulfuric acid to produce copper(II) sulfate and water. List the steps required to write its balanced chemical equation. State how to determine which of the five general types of reaction this represents.

1. change the word equation to a chemical equation 2. balance the equation by putting numbers in front of the ions

What can be predicted by using an activity series? A. whether a certain chemical reaction will occur B. the amount of energy released by a chemical reaction C. the electronegativity values of elements D. the melting points of elements

A. whether a certain chemical reaction will occur

What are the coefficients that will balance the skeleton equation below? AlCl3 + NaOH -> Al(OH)3 + NaCl a. 1, 3, 1, 3 b. 3, 1, 3, 1 c. 1, 1, 1, 3 d. 1, 3, 3, 1

a. 1, 3, 1, 3

The complete combustion of which of the following substances produces carbon dioxide and water? a. C8 H18 b. K2 CO3 c. CaHCO3 d. NO

a. C8 H18

A double-replacement reaction takes place when aqueous cobalt(III) chloride reacts with aqueous lithium hydroxide. One of the products of this reaction is ____. a. Co(OH)3 b. Co(OH)2 c. LiCo3 d. LiCl3

a. Co(OH)3

What does the symbol in a chemical equation mean? a. Heat is supplied to the reaction. b. A catalyst is needed. c. yields d. precipitate

a. Heat is supplied to the reaction.

A double-replacement reaction takes place when aqueous Na2 CO3 reacts with aqueous Sn(NO3)2. You would expect one of the products of this reaction to be ____. a. NaNO3 b. NaSn c. Sn(CO3)2 d. CNO3

a. NaNO3

Which of the following statements is NOT true about 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.

a. The products are unpredictable.

In every balanced chemical equation, each side of the equation has the same number of ____. a. atoms of each element b. molecules c. moles d. coefficients

a. atoms of each element

The equation 2C3 H7 OH + 9O2 -> 6CO2 + 8H2 O is an example of which type of reaction? a. combustion reaction b. single-replacement reaction c. double-replacement reaction d. decomposition reaction

a. combustion reaction

Chemical equations ____. a. describe chemical reactions b. show how to write chemical formulas c. give directions for naming chemical compounds d. describe only biological changes

a. describe chemical reactions

The equation H3 PO4 + 3KOH -> K3 PO3 + 3H2 O is an example of which type of reaction? a. double-replacement reaction b. combination reaction c. decomposition reaction d. single-replacement reaction

a. double-replacement reaction

In the activity series of metals, which metal(s) will displace hydrogen from an acid? a. only metals above hydrogen b. only metals below hydrogen c. any metal d. only metals from Li to Na

a. only metals above hydrogen

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 relative amounts of reactants and products

a. the correct formulas of the reactants and products

a list of metals in order of decreasing reactivity

activity series

When the equation KClO3 (s) -> KCl(s) + O2 (g) is balanced, the coefficient of KClO3 is ____. a. 1 b. 2 c. 3 d. 4

b. 2

What is the driving force in the following reaction? Ni(NO3)2 (aq) + K2 S(aq) -> NiS(s) + 2KNO3 (aq) a. A gas is formed. b. A precipitate is formed. c. Ionic compounds are reactants. d. Ionic compounds are products.

b. A precipitate is formed.

In order for the reaction 2Al + 6HCl -> 2AlCl3 + 3H2 to occur, which of the following must be true? a. Al must be above Cl on the activity series. b. Al must be above H on the activity series. c. Heat must be supplied for the reaction. d. A precipitate must be formed.

b. Al must be above H on the activity series.

Which of the following statements is NOT correct? a. The only way to determine the products of a reaction is to carry out the reaction. b. All chemical reactions can be classified as one of five general types. c. Complete combustion has occurred when all the carbon in the product is in the form of carbon dioxide. d. A single reactant is the identifying characteristic of a decomposition reaction.

b. All chemical reactions can be classified as one of five general types.

The product of a combination reaction is Ba(OH)2 . If one of the reactants is H2 O, what is the other reactant? a. Ba2 O b. BaO c. BaH d. BaO2

b. BaO

What is the balanced chemical equation for the reaction that takes place between bromine and sodium iodide? a. Br2 + NaI -> NaBr2 + I b. Br2 + 2NaI -> 2NaBr + I2 c. Br + NaI2 -> NaBrI2 d. Br + NaI2 -> NaBr + I2

b. Br2 + 2NaI -> 2NaBr + I2

Which of the following is the correctly balanced equation for the incomplete combustion of heptene, C7 H14 ? a. C7 H14 + 14O -> 7CO + 7H2 O b. C7 H14 + 7O2 -> 7CO + 7H2 O c. 2C7 H14 + 21O2 -> 14CO2 14H2 O d. C7 H14 + O2 -> C7 O2 + 7H2

b. C7 H14 + 7O2 -> 7CO + 7H2 O

Which of the following statements is NOT true about 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 substances are called reactants. d. The bonds of the reactants are broken and new bonds of the products are formed.

b. New atoms are formed as products.

In order to predict whether or not a single-replacement reaction takes place, you need to consult a chart that shows the ____. a. periodic table b. activity series of metals c. common polyatomic ions d. ionic charges of representative elements

b. activity series of metals

Everyday equations describe ____. a. thermonuclear reactions b. everyday processes c. chemical reactions d. biological chemistry

b. everyday processes

A catalyst is ____. a. the product of a combustion reaction b. not used up in a reaction c. one of the reactants in single-replacement reactions d. a solid product of a reaction

b. not used up in a reaction

In a double-replacement reaction, the ____. a. products are always molecular b. reactants are two ionic compounds c. reactants are two elements d. products are a new element and a new compound

b. reactants are two ionic compounds

The equation Mg(s) + 2HCl(aq) -> MgCl2 (aq) + H2 (g) is an example of which type of reaction? a. combination reaction b. single-replacement reaction c. decomposition reaction d. double-replacement reaction

b. single-replacement reaction

In the chemical equation H2 O2 (aq) → H2 O(l) O2 (g), the O2 is a ____. a. catalyst b. solid c. product d. reactant

b. solid

an equation in which each side has the same number of atoms of each element

balanced equation

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. (s), solid product

c. (aq), dissolved in water

What are the missing coefficients for the skeleton equation below? Cr(s) + Fe(NO3)2 (aq) -> Fe(s) + Cr(NO3)3 (aq) a. 4, 6, 6, 2 b. 2, 3, 2, 3 c. 2, 3, 3, 2 d. 1, 3, 3, 1

c. 2, 3, 3, 2

When potassium hydroxide and barium chloride react, potassium chloride and barium hydroxide are formed. The balanced equation for this reaction is ____. a. KH + BaCl -> KCl + BaH b. KOH + BaCl -> KCl + BaOH c. 2KOH + BaCl2 -> 2KCl Ba(OH)2 d. KOH + BaCl2 -> KCl2 + BaOH

c. 2KOH + BaCl2 -> 2KCl Ba(OH)2

When the equation Fe + Cl2 -> FeCl3 is balanced, what is the coefficient for Cl2 ? a. 1 b. 2 c. 3 d. 4

c. 3

Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide? a. P(s) + O2 (g) → PO2 (g) b. P(s) + O(g) → P5 O2 (g) c. P(s) + O2(g) → P2 O5 (s) d. P2 + O5 (s) → P2 (s) + O2 (g)

c. P(s) + O2(g) → P2 O5 (s)

What are the correct formulas and coefficients for the products of the following double-replacement reaction? RbOH + H3 PO4 -> a. Rb(PO4)3 + H2 O b. RbPO4 + 2H2 O c. Rb3 PO4 + 3H2 O d. H3 Rb + PO4 OH

c. Rb3 PO4 + 3H2 O

Which of the following statements is true about single-replacement reactions? a. They are restricted to metals. b. They involve a single product. c. Two reactants produce two products. d. Any metal replaces any other metal.

c. Two reactants produce two products.

This symbol ( ) indicates that ____. a. heat must be applied b. an incomplete combustion reaction has occurred c. a gas is formed by the reaction d. the reaction is reversible

c. a gas is formed by the reaction

The reaction 2Fe + 3Cl2 -> 2FeCl3 is an example of which type of reaction? a. combustion reaction b. single-replacement reaction c. combination reaction d. decomposition reaction

c. combination reaction

In a combustion reaction, one of the reactants is ____. a. hydrogen b. nitrogen c. oxygen d. a metal

c. oxygen

The type of reaction that takes place when one element reacts with a compound to form a new compound and a different element is a ____. a. combination reaction b. decomposition reaction c. single-replacement reaction d. double-replacement reaction

c. single-replacement reaction

Chemical equations must be balanced to satisfy ____. a. the law of definite proportions b. the law of multiple proportions c. the law of conservation of mass d. Avogadro's principle

c. the law of conservation of mass

In a double-replacement reaction, ____. a. the reactants are usually a metal and a nonmetal b. one of the reactants is often water c. the reactants are generally two ionic compounds in aqueous solution d. energy in the form of heat or light is often produced

c. the reactants are generally two ionic compounds in aqueous solution

a whole number that appears before a formula in an equation

coefficient

a reaction in which oxygen reacts with another substance, often producing heat or light

combustion reaction

What are the coefficients that will balance the skeleton equation below? N2 + H2 -> NH3 a. 1, 1, 2 b. 1, 3, 3 c. 3, 1, 2 d. 1, 3, 2

d. 1, 3, 2

What are the missing coefficients for the skeleton equation below? Al2 (SO4)3 (aq) + KOH(aq) → Al(OH)3 (aq) + K2 SO4 (aq) a. 1, 3, 2, 3 b. 2, 12, 4, 6 c. 4, 6, 2, 3 d. 1, 6, 2, 3

d. 1, 6, 2, 3

When the following equation is balanced, what is the coefficient for HCl? Mg(s) + HCl(aq) -> MgCl2 (aq) + H2 (g) a. 6 b. 3 c. 1 d. 2

d. 2

If you rewrite the following word equation as a balanced chemical equation, what will the coefficient and symbol for fluorine be? nitrogen trifluoride nitrogen fluorine a. 6F2 b. F3 c. 6F d. 3F2

d. 3F2

When the equation for the complete combustion of one mole of C H OH is balanced, the coefficient for oxygen is ____. a. 13/2 b. 11/2 c. 7/2 d. 9/2

d. 9/2

Use the activity series of metals to complete a balanced chemical equation for the following single replacement reaction. Ag(s) + KNO3 (aq) -> a. AgNO3 + K b. AgK + NO3 c. AgKNO3 d. No reaction takes place because silver is less reactive than potassium.

d. No reaction takes place because silver is less reactive than potassium.

If a combination reaction takes place between rubidium and bromine, the chemical formula for the product is ____. a. RuBr b. Rb2 Br c. RbBr2 d. RbBr

d. RbBr

Which of the following statements is NOT true about double-replacement reactions? a. The product may precipitate from solution. b. The product may be a gas. c. The product may be a molecular compound. d. The reactant may be a solid metal.

d. The reactant may be a solid metal.

The products of a combustion reaction do NOT include ____. a. water b. carbon dioxide c. carbon monoxide d. hydrogen

d. hydrogen

Chemical reactions ____. a. occur only in living organisms b. create and destroy atoms c. only occur outside living organisms d. produce new substances

d. produce new substances

a reaction in which a single compound is broken down into simpler substances

decomposition reaction

Describe how to write the skeleton equation for the following reaction: iron + oxygen iron(III) oxide

it is still unbalanced, but that is the skeleton

a new substance formed in a chemical reaction

product

a starting substance in a chemical reaction

reactant

In general, how are word equations written to describe chemical reactions?

reactants and products are written as words. an arrow is drawn between both. reactants are on the left while products are on the rights. if more than one reactant or product is involved in the reaction, they are seperated by plus signs

a reaction in which the atoms of one elements replace the atoms of a second element

single-replacement reaction

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

skeleton equation

a particle not directly involved in a chemical reaction

spectator ion

Predict the precipitate that forms when aqueous solutions of silver nitrate and potassium chloride react to form products in a double-replacement reaction. Include a discussion of how to write the complete chemical equation describing this reaction.

the insoluble precipitate silver chloride forms in an aqueous solution of potassium nitrate 1. write the skeleton equation 2. The relative amounts of elements are the same on either side of the equation, so the complete equation is balanced

What determines whether one metal will replace another metal from a compound in a single-replacement reaction?

when there is an obvious difference in reactivity for both your metals

Which of the following is a balanced equation representing the decomposition of lead(IV) oxide? a. PbO2 -> Pb + 2O b. PbO2 -> Pb + O2 c. Pb2 O -> 2Pb + O d. PbO -> Pb + O2

b. PbO2 -> Pb + O2