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Accelerated Chemistry > Chapter 7 > Flashcards

Chapter 7 Flashcards

1
Q

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

A

False.

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

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2
Q

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

A

True.

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3
Q

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

A

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

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4
Q

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

A

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

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5
Q

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.

A

True because 2H2O –> 2H2 + O2

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6
Q

True or false: Iron rusting is a chemical reaction.

A

True 4Fe + 3O2 –> 2Fe2O<span>3</span>

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7
Q

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

A

False

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8
Q

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

A

True

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9
Q

What does (g) indicate in the following reaction

CH4(g) + 2O2(g) –> CO2(g) + 2H2O(g)

A

gas phase

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10
Q

How are chemical equations balanced?

A

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

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11
Q

Is the following equation balanced?

CH4(g) + O2(g) –> CO2(g) + H2O(g)

A

No. H and O are not equal.

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12
Q

Balance

SiO2(s) + C(s) –> SiC(s) + CO(g)

A

SiO2(s) + 3C(s) –> SiC(s) + 2CO(g)

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13
Q

Balance the following

a CO2 + b H2O –> c c6H12O6 + d O2

a=

b=

c=

d=

A

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

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14
Q

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

A

True

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15
Q

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

A

True

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16
Q

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

A

false

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17
Q

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

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

A

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

Insoluble: PbI2(s)

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18
Q

For the following molecular equation what is the complete ionic equation

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

A

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

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19
Q

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

A

true

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20
Q

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

A

true

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21
Q

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

A

false

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22
Q

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

A

True

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23
Q

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

A

False

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24
Q

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

A

False

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25
Q

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

26
Q

True or false: All CO32-, PO43-, and S2- compounds are insoluble with the exception of alkali metals and NH4+

27
Q

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

28
Q

What is a precipitate reaction?

A

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

29
Q

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

A

Na2CO3(aq) + CuCl2(aq) –> CuCO3(s) + 2NaCl(aq)

30
Q

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

A

No reaction since NO3- is soluble with Na+ and SO42- is soluble with Li+

31
Q

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

A

Pb(C2H3O2)2(aq) + Na2SO4(aq) –> PbSO4(s) + 2NaC2H3O2(aq)

32
Q

Will the reaction form a precipitate?

a. NaNO3(aq) + CaS(aq)
b. MgSO4(aq) + CaS(aq)
c. NaNO3(aq) + MgSO4(aq)

A

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

33
Q

What is the net ionic equation?

A

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

34
Q

What is the net ionic equation of

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

A

Ag+(aq) + Cl-(aq) –> AgCl(s)

35
Q

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)

A

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)

36
Q

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

37
Q

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

A

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)

38
Q

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

A

2 HNO3(aq) + Na2CO3(aq) –> H2O(l) + CO2(g) + 2 NaNO3(aq)

39
Q

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

a. true
b. true
c. true

40
Q

Is 2 Mg(s) + O2(g) –> 2 MgO(s) a redox reaction?

A

yes, Mg reacts with elemental O2

41
Q

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

A

no, acid base reaction.

42
Q

True or false: combustion reactions are redox reactions

43
Q

Write balanced equation for combustion of CH3OH.

A

2 CH3OH(l) + 3 O2(g) –> 2 CO2(g) + 4 H2O(l)

44
Q

Is Ca(s) + Cl2(g) –> CaCl2(s) a redox reaction?

A

yes, metal reacts with nonmetal

45
Q

Is Zn(s) + Fe2+(aq) –> Zn2+(aq) +Fe(s) a redox reaction?

A

yes, transfer of electrons

46
Q

Type of chemical reaction

a. A + B –> AB
b. AB –> A + B
c. A + BC –> AB + C
d. AB + CD –> AC + BD

A

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

47
Q

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

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

48
Q

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

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

49
Q

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

A

Pb(C2H3O2)2(aq) + 2 KI(aq) –> PbI2(s) + 2 KC2H3O2(aq)

50
Q

Balance HCl(g) + O2(g) –> H2O(l) + Cl2(g)

A

4 HCl(g) + O2(g) –> 2 H2O(l) + 2 Cl2(g)

51
Q

Which are soluble?

a. CuS
b. FeSO4
c. PbCO3
d. NH4Cl

A

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

52
Q

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

A

2 KOH(aq) + NiBr2(aq) –> Ni(OH)2(s) + 2 KBR(aq)

53
Q

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

A

no reaction

54
Q

Write complete and net ionic equation for

2 HBr(aq) + Ca(OH)2(aq) –> 2 H2O(l) + CaBr2(aq)

A

2 H+(aq) + 2 Br-(aq) + Ca2+(aq) + 2 OH-(aq) –> 2 H2O(l) + Ca2+(aq) + 2 Br<span>-</span>(aq)

2 H+(aq) + 2 OH-(aq) –> 2 H2O(l) or H+(aq) + OH-(aq) –> H2O(l)

55
Q

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

A

H2SO4(aq) + 2 KOH(aq) –> 2 H2O(l) + K2SO4(aq)

H+(aq) + OH-(aq) –> H2O(l)

56
Q

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

A

2 HBr(aq) + K2SO3(aq) –> H2O(l) + SO2(g) + 2 KBr(aq)

57
Q

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

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

59
Q

Write balanced equation for combustion of pentane C5H12

A

C5H12(l) + 8 O2(g) –> 5 CO2(g) + 6 H20(g)

Accelerated Chemistry (9 decks)

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