Dynamic Equilibrium Quiz: Reactions in Chemistry

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Questions and Answers

What happens to the macroscopic properties of a closed system at equilibrium?

They change dramatically

They fluctuate continuously

They remain constant (correct)

They disappear completely

In dynamic equilibrium in chemistry, what is happening?

Only forward reactions are happening

Only reverse reactions are occurring

Both forward and reverse reactions are occurring (correct)

No reactions are taking place

What does it mean when we say the rates of the forward and reverse reactions are equal in dynamic equilibrium?

The system is out of equilibrium

The system is unstable

The system is at equilibrium (correct)

No reactions are happening

How do the concentrations of products and reactants change at equilibrium?

They remain constant (C) Signup and view all the answers

What happens to the rate of reaction as a reaction proceeds to equilibrium?

It decreases until it reaches equilibrium (B) Signup and view all the answers

What is the rate of reaction at equilibrium?

Constant (A) Signup and view all the answers

What does dynamic equilibrium refer to?

A state where the rate of forward and backward reactions are equal (A) Signup and view all the answers

In a reversible reaction, what does the two-way arrow signify?

The reaction can go both forward and backward (A) Signup and view all the answers

What happens in a closed flask when water is left in it?

Both evaporation and condensation of water happen (D) Signup and view all the answers

At dynamic equilibrium, what can be said about the rates of the forward and backward reactions?

The rates of both reactions are equal (C) Signup and view all the answers

Why does an open flask prevent the reverse reaction (condensation) from occurring?

It allows products to escape preventing the reverse reaction (A) Signup and view all the answers

What is the key characteristic of dynamic equilibrium in a chemical reaction?

The rates of the forward and backward reactions equalize at equilibrium (C) Signup and view all the answers

What is the characteristic of equilibrium that ensures no matter can escape to the surroundings?

Equilibrium is achieved in a closed system (A) Signup and view all the answers

Which statement best describes the dynamic nature of equilibrium?

Equilibrium involves reactions that are still occurring on a microscopic level (C) Signup and view all the answers

In terms of concentrations, what remains constant at equilibrium?

Concentration of reactants and products both (C) Signup and view all the answers

Which statement correctly describes the concept of equilibrium position?

Equilibrium position can be achieved from different starting conditions (A) Signup and view all the answers

What does it mean when it is said that there is no macroscopic change in properties at equilibrium?

Observable properties depend on the concentration of mixture components (D) Signup and view all the answers

In a dynamic equilibrium, what does it mean when we say 'the reaction has not stopped'?

The reaction appears stopped but is actually ongoing on a microscopic level (D) Signup and view all the answers

Study Notes

Closed System Properties at Equilibrium

Macroscopic properties do not change:
- No net change in concentration of reactants and products
- No net change in color
- No net change in temperature
- No net change in pressure
No net change in anything, but it doesn't mean nothing is happening

Dynamic Equilibrium

All equilibria in chemistry are dynamic
Forward and reverse reactions are still occurring
Reactants are still reacting to create products
Products are still reacting to create reactants
Rates of forward and reverse reactions are equal

Graphing Equilibrium

Concentrations of reactants and products change rapidly at the beginning
Rate of reaction decreases until the reaction reaches equilibrium
When reaction reaches equilibrium, there is no change to the amount of reactants and products

Characteristics of Equilibrium

Equilibrium is achieved in a closed system
Equilibrium is dynamic
Concentrations of reactants and products remain constant
No macroscopic change in properties
Equilibrium can be reached from either direction

Reversible Reactions

A reversible reaction can go both forwards and backwards
Equations use two-way arrows to show the reaction can go in either direction
Example: acid + alcohol ⇋ ester

Evaporation and Condensation of Water

In an open flask, water evaporates, but the water vapor escapes
In a closed flask, water evaporates, and the water vapor condenses back into liquid water
After some time, the rates of evaporation and condensation are equal
This is an example of dynamic equilibrium

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Description

Learn about dynamic equilibrium in chemistry where macroscopic properties remain constant while reactions are still occurring. This concept explains how reactants continue to form products and vice versa at equilibrium.