Oxidation-reduction (redox) reactions Rules for Assigning Oxidation Numbers Identifying Redox Reactions Balancing Redox Reactions
For a certain first order reaction, it is found that it takes 156 seconds for the concentration of reactant to fall from 0.100 M to 0.0500 M. How much time would it take for the concentration of reactant to fall from 0.0500 M to 0.0250 M? a. 165 seconds b. 76 seconds c. 156 seconds d. 98 seconds A catalyst functions by: a lowering the energy of the reactants. b. lowering the energy of the products. c. decreasing the rate of the reverse reaction. d. providing a reaction path with a lower acti...
Electrochemistry Questions
1. A gas occupy 1.12dm3 at stp. If the mass of the gas is 2.3g. What is the gas A. Sulphur(vi) oxide B. Nitrogen(iv)oxide C. Sulphur(iv)oxide D. Carbon(iv) oxide 2. Which of these is liquid at room temperature A. F B. Cl C. Br D. I 3. 50X is in the same group as A. 6C B. 11Na C. 17Cl D. 13Al 4. What is the formula for aluminum trioxosulphate (iv) A. Al2(SO3)2 B. AlSO4 C. Al2(SO3)3 D. Al2(SO4)3
1. A certain rate law is given as Rate = k[H2][Br2]1/2. What is the reaction order? a. ½ b.3/2c. ¾ d. 1/3 2. Using the integrated form of the rate law, determine the rate constant k of a zero-order reaction if the initial concentration of substance A is 1.5 M and after 120 seconds the concentration of substance A is 0.75 M. a. 0.00625 M/s b. 0.00875 M/s c. 0.00986 M/s d. 0.0096 M/s 3. Determine the half-life of zero-order reaction if the original concentration of the reactant is 1.2 M ...
1. Which of the following statements is true about ORDER of a reaction? a. It is obtained from a single balanced equation b. It is always a whole number c. It cannot be obtained from a balanced chemical equation d. It reveals some basic facts about reaction mechanism Answer = c 2. One of the following statements is not true about the MOLECULARITY of a reaction a. It is always a whole number b. It is generally not exceeding three and never zero. c. It reveals some basic facts about react...
The branch of chemistry that deals with the heat changes caused by chemical reactions is called (a) thermodynamics(b) thermal chemistry (c) thermochemistry(d) None of these In an exothermic reaction, the integral energy of the products is _________ internal energy of the reactants (a) greater than (b) lesser than (c) equal to (d) none of these
Here is a solution to the CHM 101 Chemical Kinetics Questions Now, Let get to Business
1. Which is most reactive? A. C6H12 B. C5H12 C. C6H10 D. C6H14 2.The following are hydrocarbons except A. Hepta-1,4-diene B. Phenol C. Toluene D. Benzene 3. Which of the following alkenes can exist as cis-trans isomer A. 2,3-dimethylbutene B. Cyclopentene C. 2-hexene D. 1-hexane 4. CH4 + NO2 = CH2NO2 + H2 what type of rxn is this A. Substitution B. Nitration C. Elimination D. Addition
PAST QUESTION CHM 112
All answers must be given with the correct units and number of significant figures. For questions 1-14, use scrap paper for your work and record only your answers in the spaces provided. For question 15 through 18, your work must be shown in detail. Questions will be marked for completeness, however will not be graded. Attach additional pages showing your work.
INSTRUCTION: Answer ALL questions. EXPECTED TIME FOR THE TEST: 25mins. All questions are Multiple Choice Questions. QUESTIONS: 40 questions.
1. 1. 0.265 g of an organic compound produced on evaporation 102 cm3 of vapour at 373 K and 775 mmHg. Percentage composition of the constituents elements are 92.24 % C and 7.76 % H. The molecular mass and molecular formula of the compound are: A. 78 g and C2H4 B. *78 g and C6H6 C. 80 g and C5H5 D. 80 g and C4H8 2. Solubility of pure organic isolate in sodium hydroxide solution, followed by reprecipitation with carbon (IV) oxide re...
1. A solution has a specific rotation of +66. What can be said about it A) It is a mixture of R and S isomers B) It is an R and dextroratory C) It is S and dextroratory D) It is dextroratory but the configuration? can't be determined 2. Ethylene is an A) Alkyne B) Alkane C) Alkene D) Ethyne 3. Structure of 4,4,5-trihydroxyl octane 4. Another name for C6H5OCl 5. The reaction of hydrogen chloride and pent-1-ene gives A) 1 chloropentane B) 2 chloropentane C) Chloropentane 6. Reaction of propene ...
1) The common feature of organic chemicals is that they contain---------- (a)fluorine (b)carbon (c)lithium (d)vinyl group 2) The ability of atoms to join together is termed------------ (a)catenation (b)cracking (c)hydrogenation (d)catalysis 3) Organic chemicals were thought to be found in only----------- (a)non-living things (b)semi-living things (c)living things (d)none of the above 4) Inorganic chemicals were thought to be found in---------- (a)living things (b)non-livingthings (c)a...