Unit 8 Review

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

• the system will adjust to increase the stress

• the system will adjust to reduce the stress

• the system will not adjust

Tags

NGSS.HS-PS1-6

When writing an endothermic reaction, heat energy is stated as a

• product

• catalyst

• reactant

• Spicy Switze

Tags

NGSS.HS-PS1-4

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

• gaseous

• liquid

• solid

• plasma

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

How do catalysts increase the rate of reaction?

• The frequency of collisions is the increased

• The activation energy is lowered

• The energy of collisions is increased

• Both the frequency and energy of collisions is increased

Tags

NGSS.HS-PS1-5

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

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

• Forward and reverse reaction rates are equal and concentration is constant

• Forward and revers reaction rates are equal and concentration is equal

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

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

This symbol indicates that a reaction is ____________

• reversible

• irreversible

Tags

NGSS.HS-PS1-6

When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in

• Chemical Equilibrium

• Chemical Balance

• Stoichiometry

• Chemical Reaction

Tags

NGSS.HS-PS1-6

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

Tags

NGSS.HS-PS1-5

Which of the following is NOT true at equilibrium?

• The forward and reverse reactions proceed at the same rate.

• The concentrations of reactants and products do not change.

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

• The forward and reverse reactions continue to occur.

Tags

NGSS.HS-PS1-6