Leang Obyerthes1. identify the factors affecting the Rate of Reaction2. describe/explain how each factor affects the Rate of ReactionPretest:Read the following statements and write the letter of your answer in your scnotebook.1. Which of the following will not change the rate of a reaction?a. adding a catalystb. adding more reactantsc. grinding the reactantsd. maintaining the temperature constant2. The addition of a catalyst in a reactiona. lowers activation energy and speeds up the reactionb. lowers activation energy and slows down the reactionc. increases activation energy and speeds up the reactiond. increases activation energy and slows down the reaction 3. Which of the following will slow down a chemical reaction?a. Increasing the particle size of the reactantsb. Increasing the temperature of the reactantsc. Increasing the concentration of the reactantsd. Increasing the volume that the reactants occupy4. Rate of a chemical reaction increases wvith a rise in the temperature of thereactants becausea. Heat increases the surface area of particles available for collision.b. Heat makes the molecules react more frequently by increasing their size.c. Heat increases the concentration of the reactants by evaporating some ofthem.d. Heat makes the particles of the reactants move more rapidly, whichenhances the possibility of collisions.5. Enzymes are examples ofa. Catalystsb. Biological elementsc. Chemicals that increase surface area of reactantsd. Molecules that increase concentration of reactantsStudying the Reaction Rate and the factors affecting it has somany essential practical applications, like for example inchemical industry, pharmaceuticals and in agriculture (suchas growth of plants and food preservation). To know moreabout these topic, you may study the concept map below;• have propermay proceed whenparticlesorientation &• enough energyduring collisionChemical Reactions• Temperature

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Answered: 1. Which of the following will not…

1. Which of the following will not change the rate of a reaction? a. adding a catalyst b. adding more reactants c. grinding the reactants d. maintaining the temperature constant

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter11: Chemical Kinetics: Rates Of Reactions

Section: Chapter Questions

Problem 103QRT

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Question

Leang Obyerthes
1. identify the factors affecting the Rate of Reaction
2. describe/explain how each factor affects the Rate of Reaction
Pretest:
Read the following statements and write the letter of your answer in your sc
notebook.
1. Which of the following will not change the rate of a reaction?
a. adding a catalyst
b. adding more reactants
c. grinding the reactants
d. maintaining the temperature constant
2. The addition of a catalyst in a reaction
a. lowers activation energy and speeds up the reaction
b. lowers activation energy and slows down the reaction
c. increases activation energy and speeds up the reaction
d. increases activation energy and slows down the reaction

3. Which of the following will slow down a chemical reaction?
a. Increasing the particle size of the reactants
b. Increasing the temperature of the reactants
c. Increasing the concentration of the reactants
d. Increasing the volume that the reactants occupy
4. Rate of a chemical reaction increases wvith a rise in the temperature of the
reactants because
a. Heat increases the surface area of particles available for collision.
b. Heat makes the molecules react more frequently by increasing their size.
c. Heat increases the concentration of the reactants by evaporating some of
them.
d. Heat makes the particles of the reactants move more rapidly, which
enhances the possibility of collisions.
5. Enzymes are examples of
a. Catalysts
b. Biological elements
c. Chemicals that increase surface area of reactants
d. Molecules that increase concentration of reactants
Studying the Reaction Rate and the factors affecting it has so
many essential practical applications, like for example in
chemical industry, pharmaceuticals and in agriculture (such
as growth of plants and food preservation). To know more
about these topic, you may study the concept map below;
• have proper
may proceed when
particles
orientation &
• enough energy
during collision
Chemical Reactions
• Temperature

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a What happens to a reaction rate as temperature drops? Give two explanations for the change. State which one is more important and explain why. b How does a catalyst affect reaction rates? c Compare reaction rates when a given reactant concentration is high with the rate when the concentration is low. Explain the difference.
. Account for the increase in reaction rate brought about by a catalyst.
Substances that poison a catalyst pose a major concern for many engineering designs, including those for catalytic converters. One design option is to add materials that react with potential poisons before they reach the catalyst. Among the commonly encountered catalyst poisons are silicon and phosphorus, which typically form phosphate or silicate ions in the oxidizing environment of an engine. Group 2 elements are added to the catalyst to react with these contaminants before they reach the working portion of the catalytic converter. If estimates show that a catalytic converter will be exposed to 625 g of silicon during its lifetime, what mass of beryllium would need to be included in the design?
If a textbook defined a catalyst as "a substance that increases the rate of a reaction," would that definition be adequate?
In the PhET Reactions tab to observe how multiple atoms and molecules interact under varying conditions. Select a molecule to pump into the chamber. Set the initial temperature and select the current amounts of each reactant. Select Show bonds under Options. How is the rate of the reaction affected by concentration and temperature?
Old-fashioned smelling salts consist of ammonium carbonate, (NH4)2CO3. The reaction for the decomposition of ammonium carbonate (NH4)2CO3(s)2NH3(g)+CO(g)+H2O(g) is endothermic. Would the smell of ammonia increase or decrease as the temperature is increased?
How is it possible for a catalyst to give products from a reaction mixture that are different from those obtained when no catalyst or a different catalyst is used? Give an example.
Consider the following hypothetical reaction: A+BC Calculate the average rate of the reaction on the basis of the following information: a. Pure A and B are mixed, and after 12.0minutes the measured concentration of C is 0.396mol/L. b. Pure A,B, and C are mixed together at equal concentrations of 0.300M. After 8.00minutes, the concentration of C is found to be 0.455M.
Consider the following statements: In general, the rate of a chemical reaction increases a bit at first because it takes a while for the reaction to get warmed up. After that, however, the rate of the reaction decreases because its rate is dependent on the concentrations of the reactants, and these are decreasing. Indicate everything that is correct in these statements, and indicate everything that is incorrect. Correct the incorrect statements and explain.
By which of the following mechanisms does a catalyst operate? a. It decreases the activation energy barrier for a reaction. b. It serves as a reactant and is consumed. c. It increases the temperature of a reaction. d. It increases the concentration of reactants.
For the endothermic reaction AB(g)A(g)+B(g), the following represents a reaction container at two different temperatures. Which one (I or II) is at the lower temperature?
Consider the hypothetical reaction A+B+2C2D+3E In a study of this reaction three experiments were run at the same temperature. The rate is defined as [B]/t. Experiment 1: [A]0 = 2.0 M [B]0 = 1.0 103 M [C]0 = 1.0 M [B] (mol/L) Time(s) 2.7 104 1.0 105 1.6 104 2.0 105 1.1 104 3.0 105 8.5 105 4.0 105 6.9 105 5.0 105 5.8 105 6.0 105 Experiment 2: [A]0 = 1.0 102M [B]0 = 3.0 M [C]0 = 1.0 M [A] (mol/L) Time(s) 8.9 103 1.0 7.1 103 3.0 5.5 103 5.0 3.8 103 8.0 2.9 103 10.0 2.0 103 13.0 Experiment 3: [A]0 = 10.0 M [B]0 = 5.0 M [C]0 = 5.0 101M [C] (mol/L) Time(s) 0.43 1.0 102 0.36 2.0 102 0.29 3.0 102 0.22 4.0 102 0.15 5.0 102 0.08 6.0 102 Write the rate law for this reaction, and calculate the value of the rate constant.

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