MDCAT

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  • Created by: SummayaM
  • Created on: 08-08-17 19:35
What is formed on addition of silver nitrate solution in sodium chloride solution?
White ppt of silver chloride AgCl
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Is hydrolysis of an ester instantaneous?
No
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What causes chemical weathering of stonework of buildings?
Acidic gases in the atmosphere
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What is the subject matter of reaction kinetics?
Studies concerned with the rates of chemical reactions and the factors that affect them
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Which step in a chemical reaction is rate determining?
The slowest step
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What is rate law?
The experimental relationship between rate of reaction and concentration of reactants
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Is the rate of a reaction constant?
No it is changing with each moment
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What does the slope of a concentration time graph tell us?
The rate of a reaction
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What are the units of rate of reaction?
Concentration/time
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For a gas phase reaction, what are the units of rate of reaction?
Pressure/time
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What is the instantaneous rate of a reaction?
The rate at any one instance during a time interval
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What is the average rate of a reaction?
The rate between two specific time intervals
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When does the average rate become closer to the instantaneous rate?
As the time interval becomes smaller
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What is the law of active mass action?
Rate of reaction is proportional to the active mass of the reactant or the product of active masses of the reactants if more than one reactant is involved
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For dilute solutions, active mass is considered to be?
Equal to concentration
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What is another name for rate constant?
Velocity constant
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What causes a change is rate constant?
Temperature
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How is the order of a reaction determined?
Through experiment
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What information about the reaction is provided by its order?
The mechanism of the reaction
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What is the order of a reaction in which water is present in excess?
Pseudo first order
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Can the order of a reaction be negative?
Yes
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The rate equation is what kind of expression?
Experimental
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Photochemical reactions are of which order?
Zero
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Zero order reactions are independent of which quantity?
Concentration of reactants
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What is the half life for decomposition of N2O2
24 minutes
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What is the order of reaction for decomposition of N2O2
First order
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Which reaction order is independent of initial concentration of reactants?
First order
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In second order reaction, what is the relationship between half life and initial concentration of reactants?
Inversely proportional
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In which order reaction is half life inversely proportional to square of initial concentration of reactants?
Third order
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What is the constant in half life equations?
Rate constant k
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What is the half life equation for second order reaction?
1/ka
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What is the half life equation for first order reaction?
0.693/k
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The rate of reaction is fast if the initial curve is?
Steep
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If a reactant or product absorbs UV, visible or infrared radiation how can the rate of the reaction be determined?
Spectrometry
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How to measure the rate of a reaction involving ions?
Electrical Conductivity Method
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When is the Dilatometric Method used?
the reaction involves small volume changes
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When is the Refractrometric method used?
Reactions in solutions where there are changes in refractive indices of the substances
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What is the optical rotation method?
For reactions involving optically active substances rate can be measured by measuring the extent of rotation
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What is required for effective collisions between molecules to occur?
Correct orientation and energy equal or greater than activation energy
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What is active energy?
The minimum amount of energy required for an effective collision
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What is an activated complex?
Unstable combination of all atoms involved in a reaction
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Is the energy of activation equal for forward and backward reactions?
No
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Redox reactions are faster or slower than ionic reactions?
Slower
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How to increase concentration of gaseous reactant?
Increase its pressure
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What happens to the peak of a higher temperature in a Boltzmann curve?
It flattens
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Which catalyst is used in fuel cells?
Platinum
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What does a catalyst do?
Decrease activation energy
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Which catalyst is used in the formation of Sulphur Trioxide?
NO
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Does a catalyst stay in the same state after a chemical reaction?
Not necessarily
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Other cards in this set

Card 2

Front

Is hydrolysis of an ester instantaneous?

Back

No

Card 3

Front

What causes chemical weathering of stonework of buildings?

Back

Preview of the front of card 3

Card 4

Front

What is the subject matter of reaction kinetics?

Back

Preview of the front of card 4

Card 5

Front

Which step in a chemical reaction is rate determining?

Back

Preview of the front of card 5
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