Consider the following reaction. What would be the equilibrium constant expression? 4Br 2 (g) + CH 4 (g) ↔ 4HBr(g) + CBr 4 (g)

[HBr] 4 [CBr 4 ]/ [Br 2 ] 4 [CH 4 ]

[Br 2 ] 4 [CH 4 ]/ [HBr] 4 [CBr 4 ]

[HBr] 4 [CBr 4 ]/ [Br 2 ] 4 [CH 4 ] 4

Define chemical equilibrium.

The rate of a forward reaction is equal to the rate of the reverse reaction.

The concentration of the reactants is equal to the concentration of the products.

The reaction stops and no further change in concentration occurs.

A complete reaction is in which:

All the reactants convert into products

All the reactants do not convert into products

Half reactants convert into products

only 10% reactants convert into products

At elevated temperatures ammonium carbonate, NH 2 COONH 4 , is in equilibrium with NH 3 and CO 2 according to the equation; NH 2 COONH 4 ( s ) ↔ 2 NH 3 ( g ) + CO 2 ( g ) What is the equilibrium expression for this reaction?

K = 2 [NH 3 ][CO 2 ] [NH 2 COONH 4 ]

K = [NH 3 ] 2 [CO 2 ] [NH 2 COONH 4 ]

What is the equilibrium-constant expression for CO 2 (g) + H 2 (g) ↔ CO(g) + H 2 O(l)

K c = [CO][H 2 O] / [CO 2 ][H 2 ]

K c = [CO 2 ][H 2 ] / [CO][H 2 O]

What are the two factors to look for when determining if the reaction is at equilibrium?

Forward and reverse reaction rates are equal and concentration is constant

Forward reaction rate is faster than the reverse and concentrations are equal

Forward and revers reaction rates are equal and concentration is equal

Forward reaction rate is faster than the reverse and concentration is equal

Identify the labels (a) and (b) on the graph.

a is concentration of reactants and b is the concentration of products

a is concentration of product and b is the concentration of reactant

a is the volume of reactants and b is the volume of product

a is the mass of reactants and b is the mass of product

Which of the following is NOT true at equilibrium?

The concentration of the reactants is equal to the concentration of the products.

The forward and reverse reactions proceed at the same rate.

The concentrations of reactants and products do not change.

The forward and reverse reactions continue to occur.

Define chemical equilibrium.

The rate of a forward reaction is equal to the rate of the reverse reaction.

The concentration of the reactants is equal to the concentration of the products.

The reaction stops and no further change in concentration occurs.

Activation energy is required to start a chemical reaction. What is activation energy?

The minimum amount of energy needed for a reaction to potentially occur

The energy needed for a reaction to occur

The energy possessed by the products

There are more products than reactants when the reaction reached equilibrium.

There are more reactant than products when the reaction reached equilibrium.

The amount of reactants is equal to the amount of products.

Coefficient of Reactants in the Balanced Reaction

Coefficient of Products in the Balanced Reaction

Order of Reaction with respect to the products

Order of Reaction with respect to the Reactants

Equilibrium

Authored by Charles Martinez

Chemistry

10th - 11th Grade

NGSS covered

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MULTIPLE CHOICE QUESTION

gaseous

liquid

solid

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

An increase of concentration in a system at chemical equilibrium will cause the reaction to shift

to the same side

to the opposite side

no shift will occur

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-5

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Equilibrium

Le Chaltelier's Principle states that if a chemical system at equilibrium is stressed,

Which of the following is not a way to stress a chemical system?

A reaction that releases heat energy is known as

When writing an endothermic reaction, heat energy is stated as

An exothermic reaction is allowed to reach equilibrium. If heat energy is then removed, the equilibrium will shift

Changes in pressure will only affect substances that are in the __________ state.

An increase of concentration in a system at chemical equilibrium will cause the reaction to shift

For the reaction...
heat + N₂ + O₂ <−> 2NO
If O₂ is removed, the concentration of N₂ will _______.

For the reaction...
heat + N₂ + O₂ <−> 2NO
If NO is removed from the system, the concentration of N₂ will _______.

For the reaction...
heat + N₂ + O₂ <−> 2NO
If the heat is added to the chemical system, the equilibrium will shift _______.

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Equilibrium

Le Chaltelier's Principle states that if a chemical system at equilibrium is stressed,

Which of the following is not a way to stress a chemical system?

A reaction that releases heat energy is known as

When writing an endothermic reaction, heat energy is stated as

An exothermic reaction is allowed to reach equilibrium. If heat energy is then removed, the equilibrium will shift

Changes in pressure will only affect substances that are in the __________ state.

An increase of concentration in a system at chemical equilibrium will cause the reaction to shift

For the reaction...heat + N2 + O2 <−> 2NOIf O2 is removed, the concentration of N2 will _______.

For the reaction...heat + N2 + O2 <−> 2NOIf NO is removed from the system, the concentration of N2 will _______.

For the reaction...heat + N2 + O2 <−> 2NOIf the heat is added to the chemical system, the equilibrium will shift _______.

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For the reaction...
heat + N₂ + O₂ <−> 2NO
If O₂ is removed, the concentration of N₂ will _______.

For the reaction...
heat + N₂ + O₂ <−> 2NO
If NO is removed from the system, the concentration of N₂ will _______.

For the reaction...
heat + N₂ + O₂ <−> 2NO
If the heat is added to the chemical system, the equilibrium will shift _______.