AnswersSY2026-27 - 2003340 Chemistry 1 Sem 2 CRWriting and Balancing Chemical Equations

Reaction Rate Answers

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Ben observes how quickly some dry wood is burning in a campfire. Which term best relates to Ben’s observation?

A
reaction rate
B
activation energy
C
collision theory
D
spontaneous reaction
2
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Consider the energy diagram below.xn.Which line indicates a higher reaction rate?

Question illustration
A
A because it has a lower activation energy.
B
B because it has a lower activation energy.
C
A because its Grxn is much lower.
Option C
D
B because its Grxn is much lower.
Option D
3

A change in which factor will affect the rate of reaction only when gases are involved?

A
temperature
B
pressure
C
surface area
D
concentration
4

A solid reactant is placed into a beaker of a warm water. The liquid vigorously bubbles as the solid dissolves into the solution. What will most likely happen if the temperature of the liquid is slightly reduced?

A
More bubbles will be produced because the solution is becoming more concentrated.
B
Fewer bubbles will be produced because of fewer collisions of reactant molecules.
C
The solid will get smaller at a faster rate because of more collisions of reactant molecules.
D
The solid will get larger at a slower rate because precipitate is coming out of the solution.
5

Which topic is commonly used to explain activation energy and how chemical reactions happen?

A
reaction rate
B
collision theory
C
velocity distribution
D
spontaneous reaction
6

The diagram below shows the movement of particles.What does this piece of evidence best support?

Question illustration
A
the collision theory
B
the Maxwell-Boltzmann distribution
C
the effect of pressure on reaction rates
D
the effect of temperature on reaction rates
7

Magnesium oxide does not readily decompose into magnesium and oxygen. The reaction is shown below.MgO(s) + 601.7 kJ Mg(s) + ½O2(g)Which factor plays the most important role in allowing this reaction to occur?

Question illustration
A
temperature
B
concentration
C
pressure
D
surface area
8

Which will cause an increase in the reaction rate between molecules?

A
Molecules have strong internal bonding.
B
Molecules collide more frequently.
C
Electrons in the bonds remain in a meta-stable state.
D
Electrons do not have enough energy to leave the bonds.
9

Which applies to the collision theory?

A
Particles need to collide in order to react.
B
Particles may obtain successful collisions in any molecular orientation.
C
Temperature increase causes kinetic energy of particles to decrease.
D
Reactions do not have to begin with collision of molecules or particles.
10

An increase in temperature affects the reaction rate by

A
decreasing the velocities of particles that collide in the reaction.
B
increasing the number of molecules that have sufficient kinetic energy to react.
C
increasing the number of molecules that have sufficient potential energy to react.
D
decreasing the energy that particles need to overcome the energy activation barrier.

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