Dynamic equilibrium

This symbol indicates that a reaction is ____________

• reversible
• irreversible

Tags

NGSS.HS-PS1-6

Which is the reactant - and why?

• A, as concentration decreases
• B, as concentration decreases
• A, as concentration increases
• B, as concentration increases

Tags

NGSS.HS-PS1-5

When the system X + 2 Y <=> Z has reached equilibrium, which of the following is TRUE?

• Forward reaction and Backward reaction stop.
• Forward reaction has sped up and backward reaction has slowed down.
• Forward and backward reactions occur at the same rate.
• Forward reaction has slowed down and backward reaction has sped up.

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

At what time the reaction reached equilibrium?

• t₁
• t₂
• t₃
• t₄

Tags

NGSS.HS-PS1-6

Which of the following is incorrect? 
A dynamic equilibrium can be achieved...

• From 100% reactants
• From 100% products
• In a closed system
• In an open system

When a dynamic equilibrium is achieved, the reactant and product concentrations are...

• Equal
• Constant

At equilibrium...

• The rate of the forward and reverse reactions are equal
• The rate of the forwards reaction is greater than that of the reverse reaction
• The rate of the reverse reaction is greater than that of the forwards reaction
• The forward and reverse reactions stop occurring

Tags

NGSS.HS-PS1-6

A crystal of iron(II) sulfate is in a state of equilibrium with a saturated solution of iron(II) sulfate, as shown in the diagram.
Which of the following statements are correct?

• The colour of the solution darkens as the crystal continues to dissolve
• The concentration of the iron(II) sulfate solution increases as the water evaporates
• The shape of the iron(II) sulfate crystal does not change
• The colour of the solution does not change but the shape of the crystal may change

Tags

NGSS.HS-PS1-7

What is the activation energy?

• The quantity of heat absorbed in a reaction
• The minimum energy needed to begin a reaction
• The energy given off after reactants collide.
• The energy difference between reactants and products

Tags

NGSS.HS-PS1-4

The picture shows a reversible chemical reaction taking place. How can equilibrium be reached?

• Stopper the flask.
• Add more reactants.
• Add more products.
• Cool the contents.

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6