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moving from one side to another, and when particles are moving more, they are way more prone to collide into one another because they are moving more. - -The surface area does have a relation to how much the particles in the substance collide, and the concentration of the substance. - -When the surface area is increased, the particles have more space to be moving around in, and therefore do have to collide into one another so much. - catalyst C6H6 + Br2 → C6H5Br + HBr 5 Which of the following changes will cause an increase in the rate of the above reaction? A increasing the concentration of Br2 B decreasing the concentration of C6H6 C increasing the concentration of HBr D decreasing the temperature - Answer A - Increasing the concentration of a reactant will increase the rate of the reaction. - Increasing the concentration of a product will not increase the rate of the reaction. - Br2 and C6H6 are reactants, and HBr is a product. - If the reaction is exothermic, heat energy is released as the reaction occurs. When heat energy is released, decreasing the temperature will increase the rate of the reaction 2CO + O2 → 2CO2 6 If the above reaction takes place inside a sealed reaction chamber, then which of these procedures will cause a decrease in the rate of reaction? A raising the temperature of the reaction chamber B increasing the volume inside the reaction chamber C removing the CO2 as it is formed D adding more CO to the reaction chamber - Answer: B - Increasing the volume of the chamber will make the particles more farther apart and spread out, this will decrease the rate of the reaction - Raising the temperature of the reaction temperature is not the correct answer because temperature is a one of the key elements that affect the reaction rate - The answer would be letter B because when the surface area or volume is decreased, the reaction will occur much slower. - - When water is stored in a container, the smaller or bigger it is makes it either take longer or less time to become ice. - - This is kind of what the enclosed container does to this reaction, there is less room for the reaction to occur. - -Also, adding or removing parts of the equation, are not going to do anything, just change what is reacting. 7 A catalyst can speed up the rate of a given chemical reaction by A increasing the equilibrium constant in favor of products. B lowering the activation energy required for the reaction to occur. C raising the temperature at which the reaction occurs. D increasing the pressure of reactants, thus favoring products. Page 144
- Answer: B - -The answer would be letter B because as mentioned previously, what changes the rate of a reaction is either a change, either rise or decrease in temperature or also an increase or decrease in the pressure. - - Letters C and D talk about increasing temperature or an increase in pressure, but because this question is asking about what a catalyst does to a chemical reaction, these are not the answers, the answer is B because that is what a catalyst does. - -The definition of a catalyst is literally “a substance that increases the rate or a chemical reaction without itself undergoing any permanent chemical change” and because of this letter B would be the correct answer choice. - Activation energy is a barrier that reactants must go through before products form - Lowering it will allow the catalyst it take charge to begin the speeding process at a much farther rate if the activation energy was risen - 8 Which reaction diagram shows the effect of using the appropriate catalyst in a chemical reaction? A C B D - Answer D - The answer is Graph D because the catalyst added to one of the lines is lower, and this is because the catalyst lowered the rate necessary for the reaction to happen. - The other graphs have some other types of changes but none of them show what a catalyst would do to the slope of a graph. - Letters A and C don’t make sense because they fluctuate more than once as if the energy lowered then peaked, then lowered again, yet raised back up then down, this would only happen if there were two reactions happening. 9 H2O2, hydrogen peroxide, naturally breaks down into H2O and O2 over time. MnO2, manganese dioxide, can be used to lower the energy of activation needed for this reaction to take place and, thus, increase the rate of reaction. What type of substance is MnO2? A a catalyst B an enhancer C an inhibitor D a reactant - Answer: A - The answer would be letter a because MnO2 is speeding up the reaction, and a catalyst is what does that. Page 145
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Honors Chemistry Class Policies and
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Unit 1 (22 days) Chapter 1 Introduc
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Lorenzo Walker Technical High Schoo
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MUSTANG LABORATORIES COMMITMENT TO
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Chapter 1 Unit 1 Introduction to Ch
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K H D B D C M KING HENRY DIED DRINK
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2. One cereal bar has a mass of 37
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1. How many meters are in one kilom
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The Learning Goal for this assignme
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RULE #3: To add/subtract in scienti
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Rule 3: A final zero or trailing ze
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For addition and subtraction, look
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Dimensional Analysis This is a way
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Chapter 4 Unit 2 Atomic Structure T
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Looking at Ions We haven’t talked
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Neutron Madness We have already lea
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In the space below, write the unabb
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Create groups for these Scientist a
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The Learning Goal for this Assignme
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Atomic Size Define Atomic Size: The
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Define Electronegativity: Electrone
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Unit 3 Chapter 25 Nuclear Chemistry
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Name ____________________ Juan Roqu
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Learning Goal for this section: The
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Beta Particle Decay Beta decay is a
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Ion Charge? What is the charge on f
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C 2 H 6 O Ethanol CH 3 CH 2 O Step
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Linear Molecular Geometry Orbital E
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Trigonal planar Molecular Geometry
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Trigonal Pyramidal Molecular Geomet
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Trigonal Bi pyramidal Molecular Geo
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Octahedral Molecular Geometry Orbit
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Orbitals Equation Lone Pairs Angle
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Chapter 9 Unit 4 Chemical Names and
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Unit 5 Chapter 10 Chemical Quantiti
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www.youtube.com/watch?v=AsqEkF7hcII
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Categories of Reactions All chemica
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List what type the following reacti
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How to Balance Chemical Equations A
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Page 96 and 97: 6) ___ 1 Mn(NO2)2 + ___ 1 BeCl2 __
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Page 102 and 103: Step 1: 200g C3H8 is equal to 4.54
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