FACTORS AFFECTING RATES OF REACTIONS ASSIGNMENT

1.

Activation energy is required to initiate
- A.
  
  Endothermic reactions only.
- B.
  
  Neither exothermic or endothermic reactions.
- C.
  
  Both exothermic and endothermic reactions.
- D.
  
  Exothermic reactions only.
2.

Which condition will increase the rate of a chemical reaction?
- A.
  
  Increased temperature and decreased concentration of reactants
- B.
  
  Increased temperature and increased concentration of reactants
- C.
  
  Decreased temperature and decreased concentration of reactants
- D.
  
  Decreased temperature and increased concentration of reactants.
3.

Given the reaction: 2 SO₂(g) + O₂(g) –> 2 SO₃(g) The rate of the forward reaction increases by adding more SO₂ because the
- A.
  
  Number of molecular collisions will increase
- B.
  
  Temperature will increase
- C.
  
  Forward reaction is endothermic
- D.
  
  Reaction will shift to the left
4.

A catalyst works by doing what?
- A.
  
  By increasing the kinetic energy of the molocules
- B.
  
  By reducing the activiation energy
- C.
  
  By increasing the activation energy
- D.
  
  By providing a large surface area
5.

What factors can alter the rate of a reaction?
- A.
  
  Temperature
- B.
  
  Molocule size
- C.
  
  X ray absorption
- D.
  
  Absorptivity
6.

What is the Delta H value for this reaction?
- A.
  
  572 kJ mol-1
- B.
  
  1370 kJ mol-1
- C.
  
  -572 kJ mol -1
- D.
  
  1942 kJ mol -1
7.

Activation energy is required to initiate
- A.
  
  Endothermic reactions only.
- B.
  
  Neither exothermic or endothermic reactions.
- C.
  
  Both exothermic and endothermic reactions.
- D.
  
  Exothermic reactions only.
8.

When NH₄NO₃ is dissolved in water, the temperature of the water decreases. When NaOH is dissolved in a separate water sample, the temperature of the water increases. Based on these observations, it can be concluded that the dissolving of
- A.
  
  Both salts are endothermic.
- B.
  
  Both salts are exothermic.
- C.
  
  NH4NO3 is exothermic and the dissolving of NaOH is endothermic.
- D.
  
  NH4NO3 is endothermic and the dissolving of NaOH is exothermic.
9.

Given the reaction: 2 SO₂(g) + O₂(g) –> 2 SO₃(g) The rate of the forward reaction increases by adding more SO₂ because the
- A.
  
  Number of molecular collisions will increase
- B.
  
  Temperature will increase
- C.
  
  Forward reaction is endothermic
- D.
  
  Reaction will shift to the left
10.

A collision model can only happen when two molecules collide just right?
- A.
  
  True
- B.
  
  False
11.

A reaction only takes when a molecule separates?
- A.
  
  True
- B.
  
  False
12.

Does the collision model only apply to when molecules collide?
- A.
  
  Yes
- B.
  
  No
13.

On this graph, which letter represents the activation energy? (hint: it isn’t F)
- A.
  
  A
- B.
  
  B
- C.
  
  C
- D.
  
  D
- E.
  
  E
14.

Which three factors affect the rate of a chemical reaction?
- A.
  
  Catalyst, Product Concentration, Container Volume
- B.
  
  Temperature, Reactant Concentration, Pressure
- C.
  
  Temperature, Reactant Concentration, Catalyst
- D.
  
  Temperature, Product Concentration, Container Volume
15.

In the reaction 2A + B –> 2C + D, the -[A] per time was found to be 5.0 . What is the rate of change of B?
- A.
  
  25 M/min
- B.
  
  10 M/min
- C.
  
  2.5 M/min
- D.
  
  5.0 M/min
16.

Consider the reaction which ammonia is synthesized from nitrogen and hydrogen gases: How is the rate of formation of ammonia related to the rate of consumption of hydrogen?

Discuss
- A.
  
  The rate of formation of ammonia is two thirds the rate of consumption of hydrogen
- B.
  
  The rate of formation of ammonia is half the rate of consumption of hydrogen
- C.
  
  The rate of formation of ammonia is equal to the rate of consumption of hydrogen
- D.
  
  The rate of formation of ammonia is 1/5 times the rate of consumption of hydrogen
17.

Use the information below to determine the order of the reaction with respect to the concentration of A. A + B –> P Trial [A] [B] rate 1 0.273 0.763 2.83 2 0.273 1.526 2.83 3 0.819 0.763 25.47
- A.
  
  3
- B.
  
  4
- C.
  
  2
- D.
  
  1
18.

The difference between the potential energy of the products and the potential energy of the reactants is the
- A.
  
  Heat of fusion
- B.
  
  Heat of reaction
- C.
  
  Free energy
- D.
  
  Activation energy
19.

The decomposition of nitrogen dioxide to nitrogen and oxygen is second-order with a rate constant k = 12.5 M^-1 s^-1. What is the half-life for the reaction if [NO₂]₀ = 0.00260 M
- A.
  
  30.8 sec
- B.
  
  0.0800 sec
- C.
  
  0.0554 sec
- D.
  
  61.5
20.

Which of the following graphs is linear for A –> products
- A.
  
  Ln[A] versus t if first-order in A
- B.
  
  Ln[A] versus t if second-order in A
- C.
  
  versus if second-order A
- D.
  
  1/[A] versus t if first-order in A
21.

For the reaction A –> B, the activation energy is = 125 kJ/mol and the heat of reaction, H = 50. kJ/mol. What is the for the reverse reaction in kJ/mol?
- A.
  
  125 kJ/mol
- B.
  
  -75 kJ/mol
- C.
  
  75 kJ/mol
- D.
  
  -125 kJ/mol
22.

Which of the following will lower the activation energy for a reaction?
- A.
  
  Adding a suitable catalyst
- B.
  
  Increasing the concentrations of reactants
- C.
  
  Raising the temperature of the reaction
- D.
  
  All of these options will lower the activation energy for a reaction
- E.
  
  There is no way to lower the activation energy of a reaction
23.

Refer to the equation below, where two mechanisms are proposed for the reaction of nitrogen dioxide with carbon monoxide: NO₂(g) + CO(g) –> CO₂(g) + NO(g) Mechanism I: NO₂(g) + CO(g) –> CO₂(g) + NO(g) (one step) Mechanism II: NO₂(g) + NO₂(g) –> NO₃(g) + NO(g) (slow) NO₃(g) + CO(g) –> CO₂(g) + NO₂(g) (fast) What is the predicted rate law for Mechanism II?
- A.
  
  Rate=k[NO2]
- B.
  
  Rate=k[NO2][CO]
- C.
  
  Rate=k[NO2]^2[CO]
- D.
  
  Rate=k[NO2]^2

Mugisa Geofrey and SOLOMON TATWEBWA

Mugisa Geofrey Zziwa is a learning facilitator with Ultimate MultiMedia Consult. With knowledge of the following topics:  Digital Pedagogy training or digital teaching skills, how to integrate ICT in teaching.  Journalism and the Internet/Computers (How internet helps journalism)  Basic web design & CMS and Multimedia Content publishing  Digital security and safety basics for journalists  Best practices for ensuring safety online  Data Mashups  Collaborative digital content development tools  Live streaming and Live reporting  Immersive Storytelling tools and practices  Among others I have conducted a number of trainings which include: • Multimedia Journalism and Digital Safety training for university Students held in Makerere University, Kampala International University and Cavendish University and sponsored by the American Embassy Uganda. • Digital Pedagogy training for Science Technology Engineering and Mathematics (STEM) Teachers held in Iganga Girls SSS in Iganga District for Eastern region Uganda, St. Maria Gorretti in MPigi District for Central region Uganda, and Teso College ALOET for the Karamoja region Uganda. Sponsored by Forum for African Women Educationalists Uganda (FAWEU) Training Teachers on integration of ICT in teaching and delivering lessons to students. • Digital Pedagogy at American Center for Teachers by Teachers In Need (TIN) Uganda. • Facilitator on Digital Pedagogy with ICT Teachers Association Uganda (ITAU) at American Center, Kyebambe Girls SSS in FortPortal for western region Uganda, Dr. Obote College Boro Boro Lira for Nothern Region Uganda.

Next ELECTROLYSIS ASSIGNMENT »

Previous « CHEMICAL KINETICS SIMPLE RATE EQUATIONS ASSIGNMENT

FACTORS AFFECTING RATES OF REACTIONS ASSIGNMENT

Leave a Comment

Recent Posts

END OF YEAR S.3 CHEMISTRY EXAM 2023

S.1 CHEMISTRY EXAM 2023

CHEMISTRY EXAM SENIOR TWO 2023

QUESTION 4

QUESTION 3

QUESTION 2

FACTORS AFFECTING RATES OF REACTIONS ASSIGNMENT

Leave a Comment

Related Post

Recent Posts

END OF YEAR S.3 CHEMISTRY EXAM 2023

S.1 CHEMISTRY EXAM 2023

CHEMISTRY EXAM SENIOR TWO 2023

QUESTION 4

QUESTION 3

QUESTION 2

Headline