Chemistry test items 2 Flashcards by Alisa Mikhova

103 in which of the following unbalanced reactions does chromium undergo oxidation?
a. Cr3+ > Cr
b. Cr3+ - ^ Cp2+
c. Cr3+ -^ Cr2O72-
d. CrO42- > Cr2O7-

c. Cr3+ -^ Cr2O72-

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True solutions are
a. Colloidal
b. Homogeneous
c. Heterogeneous
d. Aggregates

b. Homogeneous

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When the temperature increases, the solubility of solids
a. Increases
b. Decreases
c. Doesn’t change
d. Changes according to the dynamic equilibrium principles

d. Changes according to the dynamic equilibrium principles

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106.Solubility does not depend on
a. Nature of substances
b. Temperature
c. Pressure
d. Rate of stirring

d. Rate of stirring

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107.Solution of protein in water is an example of a(an).
a. True solution
b. Colloidal solution
c. Chemically pure substance
d. Alloy

b. Colloidal solution

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Which of the following is true about an unsaturated solution?
a. A solution containing less than the maximum amount of solute that will dissolve under a
given set of conditions (more solute can dissolve)
b. Solution containing the maximum amount of solute that will dissolve under a given set of
pressure and temperature conditions
C. A solution that has been prepared at an elevated temperature and then slowly cooled
d. It contains more than the usual maximum amount of solution dissolved

a. A solution containing less than the maximum amount of solute that will dissolve under a
given set of conditions (more solute can dissolve)

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Colloidal solutions are
a. Those, in which the size of the particles is 1-100 nm
b. Microheterogeneous
c. Stable dispersed systems
d. All answers are correct

d. All answers are correct

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What is the name of the major component of a solution?
a. Electrolyte
b. Solvent
C. Ether
d. Solute

b. Solvent

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111.Select the weak electrolyte among the following:
a. Na2SO4
b. NH4OH
C. KOH
d. NH4Cl

b. NH4OH

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112.When dissolved in water, all of the following compounds dissociate completely
except
a. NH4CI
b. CH3COOH
c. HBr
d. KMn04

b. CH3COOH

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113.Select one strong hydroxide among the following:
a. Fe(OH)3
b. NaOH
c. Al(OH)3
d. No answer is correct

b. NaOH

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114.When dissolved in water, all of the following compounds are strong electrolytes
except
a. H2CO3
b. HNO3
C. HCI
d. NaBr

a. H2CO3

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115.Select the strong electrolyte:
a. CH3COOH
b. NH4OH
c. HNO3
d. H2CO3

c. HNO3

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116.Select the strong acid among the following:
a. CH3COOH
b. H2C03
C. NH4OH
d. No answer is correct

d. No answer is correct

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Electrolytic dissociation is a process of
a. Decomposition of acid by electric current
b. Decomposition of substance to positive and negative ions
c. The movement of ions to inversely charged electrodes
d. Redox reaction on electrodes

b. Decomposition of substance to positive and negative ions

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Consider dissolving ammonia in water. Which species is the conjugate pair of ammonia?
a. OH-
b. H20
c. H3O+
d. NH4+

d. NH4+

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119.Select the conjugate pair:
a. HCOOH/HCOO-
b. HCOOH/OH-
C. HCOOH/H2O
d. HCOOH/H3O+

a. HCOOH/HCOO-

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120.Select the conjugate pair:
a. NH4+/OH-
b. NH3/H3O+
c. H2O/H30+
d. H2O/NH3

c. H2O/H30+

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121.The ionization process of weak electrolytes in solution is a—process
a. reversible
b. non-reversible
c. one-way
d. two-step

a. reversible

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122.Of the molecules below, only—-
is nonpolar.
a. H2
b. H2O
C. NH3
d. HCI

a. H2

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123.Select one acid-base conjugate pair among the following:
a. HNO3/HNO2
b. H2CO3/CO2
C. HCI/NaOH
d. H20/OH-

d. H20/OH-

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124.Select one acid-base conjugate pair among the following:
a. H3PO4/H2PO4-
b. H2CO3/CO2
c. NO3- /NO2-
d. H+/OH-

a. H3PO4/H2PO4-

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The pH of an aqueous solution is 4 at T = 25°C. What is the concentration of [H30*1?
a. 0.4 mol.l-1
b. 4 mol.l-1
c. 1x104 mol.l-1
d. 1x10-4 mol.l-1

d. 1x10-4 mol.l-1

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The concentration of OH in an aqueous solution at T = 25°C is 1x10^-3 mol.l^-1. What is the concentration of H3O+ ions?
a. 1x10-9 mol.|-1
b. 1x10-5 mol.|-1
c. 1x10-14 mol.|-1
d. 1x10-11 mol.|-1

d. 1x10-11 mol.|-1

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127. The concentration of H3O* in the aqueous solution at T = 25°C is 1x10-3 mol.|-1. What is the pH of this solution? a. 3 b. 1 c. 10 d. 7

a. 3

128.pH is a measure of---concentration in a solution. a. Anion b. Hydrogen ion c. Cation d. Hydroxyl ion

b. Hydrogen ion

129. Which of the following is true for a system at equilibrium? a. The mass of reactants is equal to the mass of products b. Addition of a catalyst changes the equilibrium concentrations c. The concentration of reactants is equal to the concentration of products d. The rate of the forward reaction is equal to the rate of the reverse reaction

d. The rate of the forward reaction is equal to the rate of the reverse reaction

130. Which of the factors below is not a condition necessary for chemical equilibrium? a. A closed system b. A constant temperature c. The rate of the forward reaction is equal to the rate of the reverse reaction d. The concentration of the reactant is equal to the concentration of the products

d. The concentration of the reactant is equal to the concentration of the products

131. Consider the following equilibrium: H20(g) + CO(g)^---^ H2(g) + CO2(g) + Q A closed container is initially filled with H2O and CO. As the reaction proceeds towards equilibrium: a. [CO] and [CO2] both increase b. [CO] and [CO2] both decrease c. [CO] increases and [CO2] decreases d. [CO] decreases and [CO2] increases

d. [CO] decreases and [CO2] increases

132. In all systems at equilibrium, the a. Concentration of reactants is less than the concentration of products b. Concentration of reactants and the concentration of products are equal c. Concentration of reactants is greater than the concentration of products d. Concentration of reactants and the concentration of products are constant

d. Concentration of reactants and the concentration of products are constant

133.Consider the following equilibrium: 2NH3(8^--^N2(g) + 3H2(e) A flask is initially filled with NH3. As the system approaches equilibrium, the rate of the forward reaction: a. Increases as the rate of the reverse reaction decreases b. Decreases as the rate of the reverse reaction increases c. Increases as the rate of the reverse reaction increases d. Decreases as the rate of the reverse reaction decreases

b. Decreases as the rate of the reverse reaction increases

134. The following reaction: 2S02(g) + O2(g)^---^2S03(g) is exothermic. Which one of the following will not shift the equilibrium to the right? a. Add more Oz b. Adding a catalyst c. Increasing the pressure d. Lowering the temperature

b. Adding a catalyst

135. For the reaction A(s) + B(g)-> C(s), the possible rate law is. a.Rate = k[A][Bl b.Rate = k[A] C.Rate = k[B] d.Rate = k[C]

C.Rate = k[B]

136. Consider the following equilibrium: CO(g) + 2H2(g)^---^CH3OH(g) + Q Which of the factors below would decrease the concentration of CH3OH at equilibrium: a. An addition of CO b. An addition of H2 c. A decrease in the temperature d. An increase in the temperature

d. An increase in the temperature

137. When the temperature of an equilibrium system is increased, the equilibrium always shits to favor the a. Exothermic reaction b. Endothermic reaction c. Formation of products d. Formation of reactants

b. Endothermic reaction

138. Why does reaction rate increase as the concentration increases? a. There are more particles, so there are more collisions b. The particles have more energy, so there are more collisions c. The surface area is increased, so there are more collisions d. No answer is correct

a. There are more particles, so there are more collisions

139.For the reaction A(g) + B(g) > Cl(g), the possible rate law is. a. Rate = k[A] b. Rate = k[A][B] c. Rate = K[B] d. Rate = k[C]

b. Rate = k[A][B]

140.A multistep reaction takes place by the following mechanism: A+B-> C+D A+ C -> D+E Which of the species shown above is an intermediate in the reaction? a. A b. B c. C d. D

c. C

141. When the reaction H2(g)+I2(g)=^ HI(g) takesplace in a sealed container, the rate law is Rate = kIHallb1. If one mole of Ha gas is added to the reaction chamber, which of the following will be true: a. The rate of the reaction and the rate constant will increase b. The rate of the reaction and the rate constant will not change c. The rate of the reaction will increase and the rate constant will decrease d. The rate of the reaction will increase and the rate constant will not change

d. The rate of the reaction will increase and the rate constant will not change

When the reaction A+B--^ C takes place , the rate law is Rate=k[A]. If the temperature of the reaction chamber is Increased, which of the following would be true? a. The rate of reaction and the rate constant will increase b. The rate of reaction and the rate constant will not change c.The rate of reaction will increase and the rate constant will decrease d. The rate of reaction will increase and the rate of constant will not change

a. The rate of reaction and the rate constant will increase

143.A fast reaction should have a. A high activation energy b. A catalyst present c. A large equilibrium constant d. A low activation energy

d. A low activation energy

144. Why does reaction rate increase as the temperature increases? a. Because molecules begin to collide at higher temperatures b. Because molecules have higher kinetic energy and collide more often c. Because there are more molecules at higher temperatures, so they collide more d. No answer is correct

b. Because molecules have higher kinetic energy and collide more often

145. Which of these factors will not increase the rate of a chemical reaction? a. Increasing the temperature of the reaction b. Increasing the concentration of the products c. Increasing the concentration of the reactants d. Adding a positive catalyst

b. Increasing the concentration of the products

146.What does a catalyst do? a. Speeds up or slow down a reaction and is not used up in the reaction b. Slows down a reaction and is not used up in the reaction c. Speeds up or slow down a reaction and is used up in the reaction d. Slows down a reaction and is used up in the reaction

a. Speeds up or slow down a reaction and is not used up in the reaction

147.An endothermic reaction is. a. One that releases energy b. One that absorbs energy c. Reaction of oxidation d. Combustion

b. One that absorbs energy

148. The following reaction is an example of 2SO2+O2^--V205--^2S03 a. Homogeneous catalysis b. Heterogeneous catalysis C. Enzyme catalysis d. Autocatalysis

b. Heterogeneous catalysis

149. The reaction represented on the following graph is Fig. Energy diagram of chemical reaction a. Endothermic b. Exothermic C. Vaporization d. Solvation

b. Exothermic

150. The following graph represents. Energy diagram of chemical reaction a. Homogeneous catalysis b. Heterogeneous catalysis c. Condensation d. Dilution

a. Homogeneous catalysis

151. Two optical isomers differ in a. Melting point and boiling point b. Molecular mass c. Direction of optical rotation d. Constitution

c. Direction of optical rotation

152. Which of the following compounds can form two optical isomers? a. NH2- CH2-COOH b. NH-CH-COOH CH3 C. NH2- CH2 CH3 d. CH3-CH2-COOH

b. NH-CH-COOH CH3

153. Consider the following: I. CH3CH2CH=CHCH2CH3 lI. CH3CH2CH2CH2CH=CH2 Ill. CH3CH=CHCH2CH2CH3 IV. CH2=CHCH2CH2CH2CH3 Which two structures represent the same compound: a. I and Il b. Il and Ill c. I and Ill d. Il and IV

d. Il and IV

154. CH3CH2OCH2CH3 and CH3CH2CH2CH2OH are examples of a. Structural isomers b. Resonance structures c. Functional isomers d. Conformational isomers

c. Functional isomers

155. Cis-trans isomerism is possible only in the case of: a. CH2=CBr2 b. CH2=CHBr C. Br2C=CHBr d. BrCH=CHBr

d. BrCH=CHBr

156.Enantiomers are----. a. Constitutional isomers b. Resonance structures C. Functional isomers d. Non-superimposable mirror images

d. Non-superimposable mirror images

157. Find the correct systematic name for the given hydrocarbon: CH3 CH3 l l CH3--C--CH2 CH2 -CH I l CH3 CH3 a. 2,2,5,5-tetramethylpentane b. 2,2-dimethyl-1-isopropylpropane c. 1,1,1,3-tetramethylbutane d. 2,2,5-trimethylhexane

d. 2,2,5-trimethylhexane

158. The systematic name for acetone is _ a. Propanone b. Propanal c. Propanediol d. Propanoic acid

a. Propanone

159. The given compound is a H3C- NH CH3 a. Primary amine b. Secondary amine c. Tertiary amine d. Quaternary amine

b. Secondary amine

160.Select the name of the hydrocarbon: (two conjoined aromatic circles) a. Styrene b. Phenanthrene c. Naphtalene d. Dibenzene

c. Naphtalene

161. Find the tertiary alcohol: a. 2-methylhexane-2-ol b. Pentane-3-ol c. Benzyl alcohol d. Propan-1-ol

a. 2-methylhexane-2-ol

162.Select the name of (CH3)2NH: a. Diethylamine b. Dimethylamine c. Trimethylamine d. No answer is correct

b. Dimethylamine

163. What is the number of carbon atoms in benzyl alcohol? a. 7 b. 8 c. 6 d. 9

a. 7

164. Select the correct name for the following compound: OH-(aromatic circle) a. Styrene b. Toluene c. Xylene d. Phenol

d. Phenol

165. Which of the following molecular formulas is the correct molecular formula of diethyl ether? a. C4H10O b. C4H10O2 c. C4H9O d. C4H12O

a. C4H10O

166.Select the correct name for the following compound: (aromatic ring with no double strands)-CH3 a. Methyl-cyclohexane b. Toluene C. Xylene d. Phenol

a. Methyl-cyclohexane

167.Select the group that is named vinyl: a.CH2=CH- b.-CH -CH2- c. CH2-CH2- d.No answer is correct

a.CH2=CH-

168.Select the name of the given group: aromatic circle - ( with one strand) a. Benzyl b. Cyclohexyl c. Benzoyl d. Phenyl

d. Phenyl

169. Which of the following is a methylene group? a. A CH4 group b. A CH3 group C. A CH2 group d. A CH group

C. A CH2 group

170.Compounds that are composed of only carbon and hydrogen atoms and contain only single bonds between carbon atoms and carbon and hydrogen atoms are classified as a. Alkenes b. Alkanes c. Arenes d. Alkynes

b. Alkanes

171.Select the name of the given compound: CH3 l CH3-CH2-CH-C-Cl l l Br CH3 a. 1-bromo-2-chloroisobutane b. 3-bromo-4-chloro-4,4-dimethylbutane c. 2-bromo-1-chloro-1,1-dimethylbutane d. Aromatic hydrocarbons

d. Aromatic hydrocarbons

„It the correct systematic name of the hydrocarbon with the condensed structural formulate CH3 CH3 l l CH3-C-Ch2-CH l l CH3 CH3 a. 1,1,3,3-tetramethylbutane b. 2,2,4-trimethylpentane c. 2,2,4,4- tetramethylbutane d. Isooctane

b. 2,2,4-trimethylpentane

173.Phenol is a derivative of a. Alkanes b. Alkenes c. Alkynes d. Aromatic hydrocarbons

d. Aromatic hydrocarbons

174. Which of the following pairs of alkanes are not isomers? a. 2-methylpentane and 2,2-dimethylbutane b. 2-methylbutane and n-pentane c. 2,2-dimethy|propane and 2-methylpentane d. n-hexane and 3-methylpentane

c. 2,2-dimethy|propane and 2-methylpentane

175. Which of the following pairs of alkanes are homologues? a. 2,3-dimethylbutane and 2,2-dimethylbutane b. n-hexane and 3-methylpentane c. 2,2-dimethylpropane and 2-methylbutane d. Methane and ethane

d. Methane and ethane

176.Select the correct structure of toluene among the following: a. CH3 aromatic circle CH3 b. CH3 aromatic circle CH3 C. CH3 aromatic circle d. -CH3 aromatic circle -OH

C. CH3 aromatic circle

177. Why is the halogenation of alkanes considered a chain reaction? a. It occurs quickly b. It occurs without the generation of intermediates c. The reaction allows long chains of alkanes to be formed d. Each step generates the reactive intermediate that is required for the next step to occur

d. Each step generates the reactive intermediate that is required

178.At room temperature in gaseous state are the following alkanes: a. Pentane, hexane, heptane b. Methane, ethane, propane c. Octadecane, nonadecane, icosane d. All alkanes are liquid at room temperature

b. Methane, ethane, propane

179. Which statement about alkanes is false: a. Alkanes are the most chemically reactive class of organic compounds b. Typical reaction for alkanes is substitution reaction c. When hydrocarbons are being burnt the products are carbon dioxide and water d. At room temperature methane is a gas

a. Alkanes are the most chemically reactive class of organic compounds

180.The reaction of propane with bromine is a. A substitution reaction b. An addition reaction c. An elimination reaction d. A combustion reaction

a. A substitution reaction

181. The IUPAC name of this compound is CH2-CH3 l CH3-C-CH2-CH2-CH3 l CH3 a. 2-ethyl-2-methy pentane b. 2-ethyl-3-methylhexane c. 2-methyl-3-ethylpentane d. 3,3-dimethylhexane

d. 3,3-dimethylhexane

182. How many structural isomers of heptane exist? a. 6 b. 7 c. 8 d. 9

d. 9

183. The general formula of an alkane is a. C2nH2n+2 b. CnH2n C. CnH2n+2 d. CnH2n-2

C. CnH2n+2

Which of the following compounds will be formed by the hydrogenation of ethene? a. Formic acid b. Acetone c. Acetaldehyde d. Ethane

d. Ethane

185.Which of the following compounds will be formed by the hydration of ethene? a. Ethanol b. Ethyne c. Ethanal d. Ethane

a. Ethanol

186.Alkenes always contain a a. C=C bond b. C=-C bond c. C-C bond d. C=H bond

a. C=C bond

187.Alkenes have the general formula a. CnH2n b. CnH2n-2 c. CnHn d. C2nHn

a. CnH2n

188. What is the name of the compound below? CH3-CH-CH2- C=CH2 l l CH3 CH3 a. 2,4-dimethylbutene b. 2,5-dimethylpentane c. 2,4-dimethyl-1-pentene d. 2,4-dimethyl-4-pentene

c. 2,4-dimethyl-1-pentene

189. The addition of HBr to 1-butene produces 2. A mixture of 1-bromobutane (major product) and 2-bromobutane (minor product) b. A mixture of 2-bromobutane (major product) and 1-bromobutane (minor product) c. Only 2-dibromobutane d. Only 1-dibromobutane

b. A mixture of 2-bromobutane (major product) and 1-bromobutane (minor product)

190.What is the product of the polymerization of propene? a. Polypropylene b. Polyvinyl c. Nylon 66 d. PTFE

a. Polypropylene

191.Propene is an example of a. An alkene b. An alkyne c. An alkane d. An aldehyde

a. An alkene

192. The substance with the molecular formula C6H12 is called a. Hexane b. Hexene c. Hexol d. Hexenoic acid

b. Hexene

193.Akenes could be prepared from a. Halogen substitution of alkanes b. Dehydrogenation of alcohols c. Dehydration of alcohols d. Esterification of carboxylic acids

c. Dehydration of alcohols

194.1,2-dibromoethane could be obtained by a reaction between a. Ethene and bromine b. Ethene and hydrogen bromide c. Ethene and water d. Ethene and hydrogen

a. Ethene and bromine

195. Which of the statements below is true? a. C6H12 and C7H14 are isomers b. Alkenes are less reactive with electrophilic reagents than alkynes C. C7H16 contains a double bond d. Dehydration is a chemical reaction that involves the loss of water

d. Dehydration is a chemical reaction that involves the loss of water

196.How many position isomers with the molecular formula C4Hg are possible? a. One b. Two c. Three d. Four

b. Two

197.How many geometric isomers with the molecular formula CHCI=CHCI are possible? a. One b. Two c. Three d. No answer is correct

b. Two

Which of the following reactions cannot occur? a. Alkene + HBr > bromoalkane b. Alkene + H2 > alkane c. Alkene + H20 > alcohol d. Alkane + HCI > chloroalkane

d. Alkane + HCI > chloroalkane

199. The IUPAC name of acetylene is a. Ethylene b. Ethane c. Ethyne d. Ethene

c. Ethyne

200. The carbon atoms in the triple bond of alkynes are a. sp hybridized b. sp2 hybridized c. sp3 hybridized d. No answer is correct

a. sp hybridized

201. Alkynes are hydrocarbons which contain a. C=C bonds b. C=-C bonds c. C-H bonds d. C=-H bonds

b. C=-C bonds

202. The compound below belongs to the group of H l H-C=-C-C-H l H a. Alkynes b. Alkenes c. Alkanes d. Olefins

a. Alkynes

203.Aromatic hydrocarbons a. Have sp2 hybridized carbon atoms b. Have ring structures C. Have delocalized r electrons d. All answers are correct

d. All answers are correct

204.All of the following are common reactions of benzene except a. Sulfonation b. Halogenation c. Nitration d. Hydration

d. Hydration

Chemistry test items 2 Flashcards

(102 cards)