Quiz 4 ch 4

Which of the following chemical equations represents a decomposition reaction? a.2HBr + Cl2 ? 2HCl + Br2 b.H2 + Cl2 ? 2HCl c.Na2O + CO2 ? Na2CO3 d.Na2CO3 ?Na2O + CO2 e.C2H5OH + 3O2 ? 2CO2 + 3H2O

d.Na2CO3 ?Na2O + CO2

A chemical equation with the spectator ions removed is called a(n) _____ equation. a.unbalanced b.balanced c.complete ionic d.net ionic e.spectator ionic

d.net ionic

Which of the following is an example of a combustion reaction? a.C2H5OH + 3O2 ? 2CO2 + 3H2O b.2CO2 + 3H2O ? C2H5OH + 3O2 c.2HBr + Cl2 ? 2HCl + Br2 d.Na2O + CO2 ? Na2CO3 e.Na2CO3 ?Na2O + CO2

a.C2H5OH + 3O2 ? 2CO2 + 3H2O

Which of the following is the precipitate in the possible double-replacement reaction between Na 2SO 4 and SrCl 2? a.Strontium sulfate b.Sodium chloride c.Strontium carbonate d.Sodium oxide e.Sodium hydride

a.Strontium sulfate

When ionic compounds dissolve, the ions physically separate from each other. This process is called _____. a.dissociation b.composition c.diffusion d.decomposition e.combustion

a.dissociation

The process of losing one or more electrons by an atom is called _____. a.oxidation b.dehydration c.reduction d.neutralization e.synthesis

a.oxidation

A _____ reaction occurs when two ionic compounds are dissolved in water and form a new ionic compound that does not dissolve. a.precipitation b.contamination c.condensation d.diffusion e.dispersion

a.precipitation

When an oxidation number of an atom is decreased in the course of a reaction, that atom is being _____. a.reduced b.neutralized c.synthesized d.oxidized e.decomposed

a.reduced

_____ reaction produces a single substance from multiple reactants. a.synthesis b.decomposition c.neutralization d.diffusion e.combustion

a.synthesis

Which of the following is the balanced chemical equation that represents nitrogen and hydrogen reacting to produce ammonia? a.N2 + 2H3 ? 2NH3 b.N2 + 3H2 ? 2NH3 c.N3 + 7H2 + O2 ? 3NH3 + 2H2O + H+ d.N3 + 5H2 ? 3NH3 + H+ e.N2 + 3H2 ? NH3 +H3N

b.N2 + 3H2 ? 2NH3

2HCl (aq) + Zn(s) ? ? a.ZnCl + H2Cl b.ZnCl2 + H2 c.H2Zn + Cl2 d.HZnCl2 + H+e.ZnCl + HCl

b.ZnCl2 + H2

Chemical reactions that involve the transfer of electrons are called _____ reactions. a.composition b.redox c.neutralization d.combustion e.synthesis

b.redox (or oxidation-reduction)

Which of the following is an example of a synthesis reaction? a.2NaHCO3 ? Na2CO3 + CO2 + H2O b.C3H8 + 5O2 ? 3CO2 + 4H2O c.2H2 + O2 ? 2H2O d.4NH3 + 3O2 ? 2N2 + 6H2O e.BaSO4 ? Ba2+ + SO42-

c.2H2 + O2 = 2H2O

Which of the following is an example of a single-replacement reaction? a.HCl (aq) + NaOH (aq) ? NaCl (aq) + H2O b.Ba(OH)2 (s) + 2 CuCNS (s) ? Ba(CNS)2 (aq) + CuOH (s) c.2HCl(aq) + Zn(s) ? ZnCl2(aq) + H2(g) d.AgNO3 (aq) + NaCl (aq) ? AgCl (s) + NaNO3 (aq) e.HCH3COO (aq) + NaHCO3 (s) ? NaCH3COO (aq) + CO2 (g) + H2O (l)

c.2HCl(aq) + Zn(s) --> ZnCl2(aq) + H2(g)

Identify the chemical reaction for which no reaction can be predicted. a.Fe + Cu(NO3)2 ? ? b.FeCl2 + Zn ? ? c.Cl2 + 2NaBr ? ? d.AlPO4 + Mg ? ? qe.FeCl2 + Cu ? ?

c.Cl2 + 2NaBr ? ?

?Which of the following ions are formed when AgNO 3 dissociate? a.N2- b.O2- c.NO3- d.N3- e.AgN2-

c.NO3-

A(n) _____ is any compound that increases the amount of hydrogen ion (H +) in an aqueous solution. a.base b.mineral c.acid d.metal e.salt

c.acid

An unbalanced chemical equation can be balanced by _____. a.changing the mass number of the molecules that react or are produced b.adding hydrogen ions in either sides of the equation c.changing the number of molecules that react or are produced d.adding oxygen molecules in either sides of the equation e.changing the number of atoms in the product

c.changing the number of molecules that react or are produced

A(n) _____ reaction occurs when a reactant combines with oxygen, many times from the atmosphere, to produce oxides of all other elements as products. a.diffusion b.decomposition c.combustion d.neutralization e.synthesis

c.combustion

A _____ reaction starts from a single substance and produces more than one substance. a.combustion b.synthesis c.decomposition d.diffusion e.neutralization

c.decomposition

A base is a compound that increases the amount of _____ ion in an aqueous solution. a.oxide b.hydride c.hydroxide d.hydrogen e.hydronium

c.hydroxide

Which of the following terms refer to an ionic compound that is formed from a reaction between an acid and a base? a.polymer b.soap c.salt d.alkali e.hydroxide

c.salt

An ion that does nothing in the overall course of a chemical reaction is called a(n) _____ ion. a.nonaligned b.neutral c.spectator d.intermediate e.balanced

c.spectator

In the compound calcium chloride, what is the oxidation number given to chloride? a.2 b.1 c.-2 d.0 e.-1

e.-1

???How many ions are formed when MgSO 4 dissociates? a.4 b.7 c.5 d.3 e.2

e.2

Identify the products if a double-replacement reaction occurs here. 2AgNO 3 + ZnCl2 ?? a.Ag2Cl + Zn(NO3)2 b.Zn(NO)2 + 2AgCl2 c.Zn(NO)2 + 2Ag + 2Cl2 d.Ag2Zn + N2 + 3O2 e.2AgCl + Zn(NO3)2

e.2AgCl + Zn(NO3)2

*Identify a double-replacement reaction from the following. a.Cu + 2AgNO3 ? 2Ag + Cu(NO3)2 b.Zn + 2HCl ? ZnCl2 + H2 c.Ca + 2H2O ? Ca(OH)2 + H2 d.Fe + Cu(NO3)2 ? Fe(NO3)2 + Cu e.CuCl2 + 2AgNO3 ? Cu(NO3)2 + 2AgCl

e.CuCl2 + 2AgNO3 ? Cu(NO3)2 + 2AgCl

Which of the following represents a hydronium ion? a.H2+ b.H- c.OH- d.H+ e.H3O+

e.H3O+

??In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products. This principle is formed in accordance with the _____. a.third law of thermodynamics b.second law of thermodynamics c.law of identity d.law of attraction of materials e.law of conservation of matter

e.law of conservation of matter

The chemical reaction represented by the equation HCl + KOH ? H 2O + KCl is an example of a(n) _____ reaction. a.composition b.synthesis c.combustion d.decomposition e.neutralization

e.neutralization

The reaction of an acid and a base is called a _____ reaction. a.synthesis b.decomposition c.synthesis d.combustion e.neutralization

e.neutralization