Ch 7 Chemical Reactions Test Flashcards
When the chemicals equation _Ca3N2+_H2O-> _Ca(OH)2+_NH3 is balanced, the coefficient of H2O is: A.) 2 B.) 6 C.)3 D.) 12 E.) none of the above
B
Which of the following everyday substance does NOT typically contain acid A.) limes B.) lemons C.)soap D.) vinegar E.) all of the above
C
All of the following compounds are soluble in water except: A.) CaCl B.) NH4Cl C.)FeCl3 D.) NaCl E.) PbCl2
E
What type of reaction is the generic equation A+BC->AC+B A.) synthesis/combination B.) decomposition C.) single displacement D.) double displacement E.) none of the above
C
What must be supplied for a decomposition reaction to happen A.) energy B.) heat C.) light D.) electrical current E.) any of the above
E
When the reaction,_N2+_H2->_NH3 is balance, the coefficient of hydrogen is A.) 1 B.) 2 C.) 3 D.) 4 E.) none of the above
C
Which of the following is NOT typically a sign of a chemical reaction
A.) emission of heat when chemicals are contracted with each other
B.) emission of light when chemicals are contracted with each other
C.) absorbing heat when chemicals are contracted with each other
D.) absorbing light when chemicals are contacted with each other
E.) all the above are signs of a chemical reaction
E
Which is a spectator ions from the following complete ionic equation Ag+NO3+K+Br->AgBr+K+NO3 A.) Br B.) K C.) Ag D.) AgBr E.) none of the above
B
As defined in the text, identify the "gas evolution" reaction among the following 1.) 2HCl+K2O3->H2O+CO2+2KCl 2.) CH4+2O2->CO2+2H2O 3.)2HCl+K2S->H2S+2KCl A.) 1&2 B.) 1&3 C.) 2&3 D.) all of 1,2,3 E.) none of 1,2,3
D
Hat is the molecular equation for the reaction of hydrochloride acid with potassium hydroxide A.) H+OH->H2O B.) HCl+KOH->H2O+KCl C.) 2HCl+K(OH)2->2H2O+KCl2 D.) H2Cl+2KOH->H2O+2KCl E.) none of the above
B
What type of reaction is the generic equation AB->A+B A.) synthesis/combination B.) decomposition C.) single displacement D.) double displacement E.) none of the above
B
Which of the following equations is NOT balanced properly A.)2Cr+6HCl->2CrCl3+3H2 B.) Cr2(SO4)3+6KOH->2Cr(OH)3+3K2SO4 C.) 4NH3+14O2->2Cr(OH)3+3K2SO4 D.) none of the above
C
Which of the following statements about balancing reactions in FALSE
A.) when coefficients are added the type of compound is changed in the chemical reaction
B.) subscripts at multiplied by the coefficients to determine the number of atoms in a compound
C.)if there is no coefficient or subscript, a one is implied
D.)coefficients are added to compounds to ensure both sides of the reaction have equal numbers of each atom
E.) all of the above
A
Methane gas (CH4), on complete combustion in air, produces
- )CO2
- )H2
- ) H2O
A.) 1&2 B.) 2&3 C.) 1&3 D.) all of 1 and 2 E.) none of the above
C
What type of a reaction occurs when a silver nitrate solution is mixed with sodium chloride solution A.)oxidation reaction B.) gas evolution C.) acid-base neutralization D.) precipitation E.) no reaction
D
What would be the formula of the precipitate hat forms when pb(no3)2 and k2so4 are mixed A.) k(no3)2 B.) pbk2 C.) h2o D.) pbso4 E.) none of the above
D
Considering the following precipitation reaction:
Pb(NO3)+2KI->PBI2+2KNO3
Which ion would not be present in the complete ionic equation
A.) pb^2+
B.) i
C.) k
D.) no3
E.) all of the above ions are in the complete ionic equation
E
When water is heated, bubbles form in the water. Is this evidence of a chemical reaction? Why?
A.)no, the formation of gas bubbles is a secondary chemical reaction which is ignored
B.) yes, the formation of a gas is proof a new compound has been made
C.) no, boiling water is a physical change
D.) yes, the formation of a gas is evidence of a chemical reaction
E.) none of the above
C
In writing the chemical equation for a precipitation reaction, what abbreviation of the physical state must appear with one of the products A.) l B.) g C.) w D.) s E.) none of the above
D
Several grams o sodium chloride are stirred into a glass of water and are no longer visible to the eye. Which of the following statements is FALSE
A.) the sodium chloride solid has dissociated into its component ions
B.) no precipitate has formed
C.) sodium gloried is insoluble in water
D.) an aqueous solution has been prepared
E.) all are true
C
Which of the following compounds is insoluble A.) magnesium sulfate B.) magnesium iodide C.) magnesium nitrate D.) magnesium phosphate E.) none of the above
D
When the equation _NO2+_H2O+_O2->_NHO3 is balanced, the coefficient of HNO3 is A.) 5 B.) 3 C.) 4 D.) 2 E.) none of the above
C
Identify the oxidation reduction reactions among the following #28
X
What are the coefficients for the following reactions when it’s properly balanced
_nitrate monoxide+_carbon monoxide->_nitrogen+_carbon dioxide
A.)2212
B.)2112
C.)1122
D.) 2221
E.) none of the above
A
Which of the following compounds is Soluble A.) aluminum sulfate B.) aluminum hydroxide C.) aluminum sulfide D.) aluminum carbonate E.) non of the above
A
What type of reaction is the generic equation ab+cd->ad+cb A.) synthesis/ combination B.) decomposition C.) single displacement D.) double displacement E.) none of the above
D
A reaction which forms a solid product is an example of a A.) combustion reaction B.) gas evolution reaction C.) oxidation reduction reaction D.) precipitation reaction E.) none of the above
D
What type of reaction is the generic equation a+b->ab A.) synthesis/combustion B.) decomposition C.) single displacement D.) double displacement E.) none of the above
A
Which of the following is NOT evidence that a chemical reaction has occurred
A.) emission of light when chemicals are contacted with each other
B.) solid formation when chemicals are contacted with each other
C.) color change when chemicals are contacted with each other
D.) gas formation what chemicals are contacted with each other
E.) all the above are evidence of a chemical reaction
E
When solid NaCl is stired into water, which of the following i not true
A.) individual sodium and chloride ions are present
B.) the solution will conduct electricity
C.) the NaCl will fail to dissociate
D.) the solutions will taste salty
E.) none of the above
C
Identify the double displacement reactions among the following # 37
D
What type of reaction occurs when a potassium nitrate solution is mixed with a barium acetate solution A.) precipitation B.) gas evolution C.) acid base neutralization D.) oxidation reduction E.) no reaction
E
Before a chemical equation can be written, one must know
A.) the symbols and formulas of all reactants and products
B.) the molar mass of all the compounds
C.) the atomic mass of all the elements involved
D.) the number of moles of all reactants and products
E.) none of the above
A
An aqueous solution is
A.) water with another compound dissolved in it
B.) any liquid with another compound dissolved in it
C.) water with a molecular compound dissolved in it
D.) an ionic compound with water dissolved in it
E.) none of the above
A
A redox has occurred ________.
A.) when a substance reacts with elemental oxygen
B.) when one substance transfers protons t another
C.) when one substance forms a solid
D.) when an alkali metal reacts with an alkaline earth metal
E.) when all the above occur
A
What are the coefficients for the following reaction when it is properly balanced _o2+_ch4->_co2+_h2o A.)2131 B.)2112 C.)2322 D.) 1321 E.) none of the above
B
A reaction which forms a gaseous product is an example of a A.) precipitation reaction B.) combustion reaction C.) oxidation reduction reaction D.) gas evolution reaction E.) none of the above
D
What are the coefficients for the following reaction when it is properly balanced
_nitric acid+_sodium hydroxide->_sodium nitrate+_water
A.) 2322
B.) 1111
C.) 5221
D.) 2111
E.) none of the above
B
What are the coefficients for teh ollwoing reaction when its properly balanced _na3po4+_ba(no3)2->_nano3+_ba3(po4)2 A.) 2113 B.) 2361 C.) 6132 D.) 2316 E.) none of the above
B
When the equation, _O2+_C6H14->_CO2+_H2O is balanced, the coefficient of O2 is A.) 3 B.) 19 C.) 10 D.) 38 E.) none of the above
B
What are the coefficients for the following reaction when it is properly balanced _O2+_CH4->_CO2+_H2O A.) 2131 B.) 2112 C.)2322 D.) 1321 E.) none of the above
B
T/F
An aqueous solution is a homogeneous mixture of a substance with water and should be designated with the (l) abbreviation
F
T/F
When a compound containing polyatomic ions dissolve, the polyatomic ions usually dissolve as intact units
T
T/F
Color change is evidence that a Chicago reaction has occurred
T
T/F
Bubbles in water that appear during boiling show hat a chemical reaction is occurring
T
T/F
Li, na, k, and NH4 compounds are soluble
T
T/F
Combustion reaction are aa subcategory of oxidation reduction reaction
T
T/F
The following reaction is balanced: AgNO3+2SH4Cl->AgCl+(NH4)NO3
F
T/F
In an oxidation reduction reaction, if one substance loses electrons, then another substance must gain electrons
T
T/F
Mixing 2 aqueous solutions will always result in formation of a precipitate
F
T/F
An insoluble compound will completely dissolve in water
F
A reaction which forms a gaseous product is an example of a A.) precipitation reaction B.) combustion reaction C.) oxidation reduction reaction D.) gas evolution reaction E.) none of the above
D
What are the coefficients for the following reaction when it is properly balanced
_nitric acid+_sodium hydroxide->_sodium nitrate+_water
A.) 2322
B.) 1111
C.) 5221
D.) 2111
E.) none of the above
B
Hat are the coefficients for the following reaction when its properly balanced _HCl+_Mg->_MgCl+_H2 A,) 1112 B.) 2122 C.) 2111 D.) 1,2,1/2,1 E.) none of the above
C
What are the coefficients for the following reaction when its properly balanced
_potassium iodide+_lead (ii) acetate->_lead (ii) iodide+_potassium acetate
A.) 2111
B.) 1122
C.) 2112
D.) 3221
E.) none of the above
C
Considering the following precipitation reaction
Pb(NO3)2+2KI->PbI2+2KNO3
Which compound would not form ions in the complete ionic equation
A.) KNO3
B.) KI
C.) PbI2
D.) Pb(NO3)2
E.) all compounds for ion sn the compete ionic equation
E
Considering the following precipitation reaction
Pb(NO3)2+2KI->PbI2+2KNO3
What is the correct net ionic equation
Pb^(2+)+2I(-)->PbI2
