Ture or false: an electrical current passing through water resulting in the formation of H2 and O2 that appears as bubbles rising in water is a chemical reaction.

True because 2H2O --\> 2H2 + O2

Balance SiO2 (s) + C (s) --\> SiC (s) + CO (g)

SiO2 (s) + 3C (s) --\> SiC (s) + 2CO (g)

Chapter 7 Flashcards by Maddie Yee

True or false: Formation of a solid or gas is chemical reaction.

False.

Boiling of water to steam or freezing of water to ice is not a chemical reaction.

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True or false: Heat absorption, heat emission, and light emission are evidence of a chemical reaction.

True.

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True or false: ice melting upon warming is chemical reaction.

False. both ice and water are H₂O-no chemical change.

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True or false: bubbles forming while a can of soda is opened is a chemical reaction.

False. bubbles are just carbon dioxide coming out of solution.

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Ture or false: an electrical current passing through water resulting in the formation of H₂ and O₂ that appears as bubbles rising in water is a chemical reaction.

True because 2H₂O –> 2H₂ + O₂

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True or false: Iron rusting is a chemical reaction.

True 4Fe + 3O₂ –> 2Fe₂O_{<span>3</span>}

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True or False: reactants are on the right side of the equation

False

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True or false: products are on the right side of the equation.

True

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What does (g) indicate in the following reaction

CH₄(g) + 2O₂(g) –> CO₂(g) + 2H₂O(g)

gas phase

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How are chemical equations balanced?

number of each type of atom must be equal in the reactants and products

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Is the following equation balanced?

CH₄(g) + O₂(g) –> CO₂(g) + H₂O(g)

No. H and O are not equal.

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Balance

SiO₂(s) + C(s) –> SiC(s) + CO(g)

SiO₂(s) + 3C(s) –> SiC(s) + 2CO(g)

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Balance the following

a CO₂ + b H₂O –> c c₆H₁₂O₆ + d O₂

a=6, b=6, c=1, d=6

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True or false: an aqueous solution is a homogeneous mixture of a substance with water.

True

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True or false: a compound is soluble in a particular liquid if it dissolves in that liquid.

True

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True or false: a reaction which does not for a solid when two aqueous solutions are mixed is called a precipitate.

false

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What is precipitate in the following reaction and which are soluble and insoluble?

2KI(aq) + Pb(NO₃)₂(aq) –> PbI₂(s) +2KNO₃(aq)

precipitate: PbI₂(s)
soluble: KI(aq), Pb(NO₃)₂(aq), KNO₃(aq)

Insoluble: PbI₂(s)

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For the following molecular equation what is the complete ionic equation

AgNO₃(aq) + NaCl(aq) –> AgCl(s) + NaNO₃(aq)

Ag⁺(aq) + NO₃^-(aq) + Na⁺(aq) + Cl^-(aq) –> AgCl(s) + Na⁺(aq) + NO₃^-(aq)

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True or false: acid-base reactions are reactions that form water when mixing an acid and a base

true

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True or false: reactions which involve transfer of electrons are called oxidation-reduction reactions and many involve a reaction of a substance with oxygen.

true

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True or false: all alkali metal compounds are not soluble.

false

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True or false: all Li, Na, K NH₄ compounds are soluble.

True

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True or false: all compounds containing NO₃^-, ClO₃^-, and ClO₄^- are not soluble.

False

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True or false: Most OH^- compunds are soluble with the exception of Alkali metals, Ba₂⁺ and NH₄⁺

False

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True or false: Most Cl^-, Br^-, and I^- compunds are soluble with the exception of Ag⁺, Hg₂²⁺, or Pb²⁺

True

True or false: All CO₃^2-, PO₄^3-, and S^2- compounds are insoluble with the exception of alkali metals and NH₄⁺

True

True or false: Most SO₄ compunds are soluble with exception of Ba²⁺, Hg²⁺, Pb²⁺

True

What is a precipitate reaction?

a reaction that forms a solid or precipitate when two aqueous solutions are mixed.

Write the precipitate equation for sodium carbonate and copper(II) chloride.

Na₂CO₃*(aq)* + CuCl₂*(aq)* --\> CuCO₃*(s)* + 2NaCl*(aq)*

Write the precipitate equation when solutions of lithium nitrate and sodium sulfate are mixed if a reaction occurs.

No reaction since NO₃^- is soluble with Na⁺ and SO₄^2- is soluble with Li⁺

Write the precipitate equation when solutions of lead (II) acetate and sodium sulfate are mixed if a reaction occurs.

Pb(C₂H₃O₂)₂*(aq)* + Na₂SO₄*(aq)* --\> PbSO₄*(s)* + 2NaC₂H₃O₂*(aq)*

Will the reaction form a precipitate? a. NaNO₃*(aq)* + CaS*(aq)* b. MgSO₄*(aq)* + CaS*(aq)* c. NaNO₃*(aq)* + MgSO₄*(aq)*

a. no b. yes MgS and CaSO₄ are insoluble c. no

What is the net ionic equation?

An equation which only shows the species that actually participate in the reaction.

What is the net ionic equation of Ag+(aq) + NO3-(aq) + Na+(aq) + Cl-(aq) --\> AgCl(s) + Na+(aq) + NO3-(aq)

Ag+(aq) + Cl-(aq) --\> AgCl(s)

Write the complete ionic equation and the net ionic equation for the reaction. Pb(NO₃)₂*(aq)* + 2 LiCl*(aq)* --\> PbCl₂*(s)* + 2 LiNO₃*(aq)*

Complete: Pb²⁺*(aq)* + 2 NO₃^-(aq)+ 2 Li⁺(aq) + 2 Cl^-*(aq)* --\> PbCl₂*(s)* + 2 Li⁺(aq) + 2 NO₃^-*(aq)* Net: Pb²⁺*(aq)* + 2 Cl^-*(aq) --\>* PbCl₂*(s)*

True or false: gas evolution reactions do not produce gas.

false

Write molecular and net ionic reaction for HNO₃*(aq)* and CA(OH)₂*(aq).*

Molecular: 2 HNO₃*(aq)* + Ca(OH)₂*(aq)* --\> 2 H₂O*(l)* + CA(NO₃)₂*(aq)* Net ionic: 2H⁺*(aq)* + 2 OH^-*(aq)* --\> 2 H₂O*(l)*

Write gas evolution equation for aqueous nitric acid and aqueous sodium carbonate.

2 HNO₃*(aq)* + Na₂CO₃*(aq)* --\> H₂O*(l)* + CO₂*(g)* + 2 NaNO₃*(aq)*

True or false: Redox reaction include a. a substance which reacts with elemental oxygen b. a metal that reacts with a nonmetal c. one substance which transfers electrons to another substance

a. true b. true c. true

Is 2 Mg*(s)* + O₂*(g)* --\> 2 MgO*(s)* a redox reaction?

yes, Mg reacts with elemental O₂

Is 2 HBr*(aq)* + Ca(OH)₂*(aq)* --\> H₂O*(l)* + CaBr₂*(aq)* a redox reaction?

no, acid base reaction.

True or false: combustion reactions are redox reactions

true

Write balanced equation for combustion of CH₃OH.

2 CH₃OH*(l)* + 3 O₂*(g)* --\> 2 CO₂*(g)* + 4 H₂O*(l)*

Is Ca*(s)* + Cl₂*(g)* --\> CaCl₂*(s)* a redox reaction?

yes, metal reacts with nonmetal

Is Zn*(s)* + Fe²⁺*(aq)* --\> Zn²⁺*(aq)* +Fe*(s)* a redox reaction?

yes, transfer of electrons

Type of chemical reaction a. A + B --\> AB b. AB --\> A + B c. A + BC --\> AB + C d. AB + CD --\> AC + BD

a. synthesis or combination b. decomposition c. single displacement d. double displacement

Complete equations and identify type of reaction a. CaO*(s)* + CO2*(g)* --\> CaCO₃*(s)* * b*. KClO₃*(s)* --\> KCL*(s)* + O₂*(g)* c. Na*(s)* + HOH*(l)* --\> NaOH*(aq)* + H2*(g)* d. HCl*(aq)* + Na₂CO₃*(aq*) --\> H₂O*(l)* + CO₂*(g)* + NaCl*(aq)*

a. CaO*(s)* + CO2*(g)* --\> CaCO₃*(s) synthesis* b. 2 KClO₃*(s)* --\> 2 KCL*(s)* + 3 O₂*(g) decomposition* c. 2 Na*(s)* + 2 HOH*(l)* --\> 2 NaOH*(aq)* + H2*(g) displacement* d. 2 HCl*(aq)* + Na₂CO₃*(aq*) --\> H₂O*(l)* + CO₂*(g)* + 2 NaCl*(aq) double displacement with gas evolution and acid base reaction*

Which of the following are chemical reactions? a. butane buring in a butane lighter b. butane evaporating out of a lighter c. wood burning d. dry ice subliming

a. yes combustion with O₂ b. no just phase change c. yes combustion d. no just phase change

Write balanced reaction of aqueous lead(II) acetate with aqueous potasium iodide to form solid lead(II) iodide and aqueous potasium acetate.

Pb(C₂H₃O₂)₂*(aq)* + 2 KI*(aq*) --\> PbI₂*(s)* + 2 KC₂H₃O₂*(aq)*

Balance HCl*(g)* + O₂*(g)* --\> H₂O*(l)* + Cl₂*(g)*

4 HCl*(g)* + O₂*(g)* --\> 2 H₂O*(l)* + 2 Cl₂*(g)*

Which are soluble? a. CuS b. FeSO₄ c. PbCO₃ d. NH₄Cl

a. no b. yes c. no d. yes

Write equation for precipitation reaction that occurs (if any) when solutions of potassium hydroxide and nickel(II) bromide are mixed.

2 KOH*(aq)* + NiBr₂*(aq)* --\> Ni(OH)₂*(s)* + 2 KBR*(aq)*

Write equation for precipitation reaction that occurs (if any) when solutions of ammonium chloride and iron(III) nitrate are mixed.

no reaction

Write complete and net ionic equation for 2 HBr*(aq)* + Ca(OH)₂*(aq)* --\> 2 H₂O*(l)* + CaBr₂*(aq)*

2 H⁺*(aq)* + 2 Br^-*(aq)* + Ca²⁺*(aq)* + 2 OH^-*(aq)* --\> 2 H₂O*(l)* + Ca²⁺*(aq)* + 2 Br^-*(aq)* 2 H⁺*(aq)* + 2 OH^-*(aq)* --\> 2 H₂O*(l) or* H⁺*(aq)* + OH^-*(aq)* --\> H₂O*(l)*

Write molecular and net ionic equation for the reaction between aqueous H₂SO₄ and KOH

H₂SO₄*(aq)* + 2 KOH*(aq)* --\> 2 H₂O*(l)* + K₂SO₄*(aq)* H⁺*(aq)* + OH^-*(aq)* --\> H₂O*(l)*

Write equation for the gas evolution that occurs when aqueous hydrobromic acid and potassium sulfite are mixed

2 HBr*(aq)* + K₂SO₃*(aq)* --\> H₂O*(l)* + SO₂*(g)* + 2 KBr*(aq)*

Which are redox reactions a. 2 Li*(s)* + Cl₂*(g)* --\> 2 LiCl*(s)* b. 2 Al*(s)* + 3 Sn²⁺*(aq)* --\> 2 Al³⁺*(aq)* + 3 Sn*(s)* c. Pb(NO₃)₂*(aq)* + 2 LiCl --\> PbCl₂*(s)* + 2 LiNO₃*(aq)* d. C*(s)* + O₂*(g)* --\> CO₂*(g)*

a. yes b. yes c. no precipitation d. yes

Write balanced equation for combustion of pentane C₅H₁₂

C₅H₁₂*(l)* + 8 O₂*(g)* --\> 5 CO₂*(g)* + 6 H₂0*(g)*

Chapter 7 Flashcards

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