AnswersIA-Chemistry A Survey of Chemistry ALab: Types of Reactions

Reaction Rate Answers

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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
2
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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.
3

Which best explains why sawdust burns more quickly than a block of wood of equal mass under the same conditions?

A
The molecules move more quickly in the sawdust than in the block of wood.
B
The pressure of oxygen is greater on the sawdust.
C
More molecules in the sawdust can collide with oxygen molecules.
D
Oxygen is more concentrated near the sawdust than the block of wood.
4

The production of water proceeds according to the following equation.2H2(g) + O2(g) 2H2O(g)Which describes a way to speed up the collisions between hydrogen and oxygen molecules to produce more water?

Question illustration
A
Use a less-intense source of heat on the reactants.
B
Maintain the same temperature of the reactants.
C
Place the reactants in a smaller container.
D
Reduce the concentration of the reactants.
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

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.
7

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
8

Which term refers to the speed at which reactants are converted into products?

A
reaction rate
B
activation energy
C
meta stable state
D
spontaneous reaction
9

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.
10

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

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